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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (1)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (1)
-
-
-
-
Southern Africa
-
South Africa
-
Bushveld Complex (1)
-
Transvaal region (2)
-
-
-
West Africa
-
Ghana (1)
-
-
-
Asia
-
Far East
-
China (1)
-
Japan
-
Honshu
-
Hyogo Japan
-
Ikuno Mine (1)
-
-
-
-
-
Indian Peninsula
-
India
-
Maharashtra India
-
Latur India (1)
-
-
-
-
Middle East
-
Israel (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Bay of Fundy (50)
-
Georges Bank (1)
-
Gulf of Maine (3)
-
Gulf of Saint Lawrence (11)
-
Hudson Bay (3)
-
Labrador Sea (1)
-
North Sea (1)
-
Northwest Atlantic (2)
-
Sable Island Bank (1)
-
Scotian Shelf (3)
-
-
-
Atlantic region (2)
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
Victoria Australia (1)
-
Western Australia
-
Kambalda Australia (1)
-
-
-
-
Avalon Zone (28)
-
Baffin Bay (1)
-
Bald Mountain (1)
-
Broken Hill Mine (1)
-
Caledonides (4)
-
Canada
-
Arctic Archipelago (1)
-
Eastern Canada
-
Baffin Island (2)
-
Gander Zone (5)
-
Maritime Provinces
-
New Brunswick
-
Albert County New Brunswick (4)
-
Carleton County New Brunswick
-
Woodstock New Brunswick (1)
-
-
Charlotte County New Brunswick (3)
-
Fredericton New Brunswick (5)
-
Gloucester County New Brunswick
-
Bathurst mining district (37)
-
Bathurst New Brunswick (25)
-
-
Kent County New Brunswick (1)
-
Kouchibouguac Bay (8)
-
Madawaska County New Brunswick (1)
-
Miramichi Bay (11)
-
Moncton Basin (8)
-
Northumberland County New Brunswick
-
Newcastle New Brunswick (3)
-
-
Queens County New Brunswick (1)
-
Restigouche County New Brunswick (6)
-
Saint George Batholith (5)
-
Saint John County New Brunswick
-
Saint John New Brunswick (20)
-
-
Sunbury County New Brunswick (1)
-
Victoria County New Brunswick (1)
-
Westmorland County New Brunswick (3)
-
-
Nova Scotia
-
Annapolis County Nova Scotia (1)
-
Antigonish County Nova Scotia (1)
-
Cape Breton Island (10)
-
Chedabucto Bay (1)
-
Cobequid Bay (1)
-
Cobequid Fault (3)
-
Cobequid Highlands (7)
-
Colchester County Nova Scotia (1)
-
Cumberland County Nova Scotia
-
Joggins Fossil Cliffs (7)
-
-
Halifax County Nova Scotia
-
Halifax Nova Scotia (1)
-
-
Hants County Nova Scotia (6)
-
Kings County Nova Scotia (4)
-
Minas Basin (27)
-
Sable Island (1)
-
-
Prince Edward Island (9)
-
-
Meguma Terrane (9)
-
Newfoundland and Labrador
-
Newfoundland
-
Avalon Peninsula (2)
-
Humber Arm Allochthon (2)
-
-
-
Ontario
-
Ottawa Ontario (1)
-
Sudbury District Ontario (1)
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (1)
-
-
-
Quebec
-
Anticosti Island (1)
-
Charlevoix (2)
-
Gaspe Peninsula (20)
-
Gaspe-Est County Quebec
-
Gaspe Quebec (2)
-
-
Gatineau Valley (1)
-
Magdalen Islands (1)
-
Matapedia County Quebec (1)
-
Montreal and Jesus Islands County Quebec
-
Montreal Quebec (1)
-
-
Rimouski County Quebec (3)
-
Saint Lawrence Estuary (2)
-
Temiscouata County Quebec (1)
-
-
-
Hudson Bay (3)
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Mackenzie Mountains (1)
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Muskox Intrusion (1)
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Northumberland Strait (3)
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Nunavut
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Baffin Island (2)
-
-
Ungava (1)
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Western Canada
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Alberta (2)
-
British Columbia (6)
-
Manitoba (3)
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Northwest Territories (6)
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Saskatchewan (2)
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Yukon Territory (2)
-
-
-
Canterbury Basin (1)
-
Cardigan Bay (1)
-
Central Basin (1)
-
Chaleur Bay (11)
-
Chicxulub Crater (1)
-
Commonwealth of Independent States
-
Russian Federation
-
Timan Ridge (1)
-
-
Timan Ridge (1)
-
-
Cumberland Basin (12)
-
Dunnage Melange (1)
-
Dunnage Zone (2)
-
Eagle Lake (1)
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Eel River (1)
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Europe
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Southern Europe
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Italy (1)
-
-
Timan Ridge (1)
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Western Europe
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Ireland (1)
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Netherlands
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Wadden Zee (1)
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Scandinavia
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Finland (1)
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United Kingdom
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Great Britain
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England
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Cambridge England (1)
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Cornwall England (1)
-
-
Scotland (2)
-
Wales
-
Anglesey Wales (1)
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South Wales (1)
-
-
-
-
Wadden Sea
-
Wadden Zee (1)
-
-
-
-
Grand Banks (2)
-
Green Mountains (1)
-
Heron Island (1)
-
Indian Ocean
-
Dampier Sub-basin (1)
-
-
Lake George (1)
-
Maritimes Basin (7)
-
Mexico
-
Yucatan Mexico (1)
-
-
Midlands (1)
-
North America
-
Appalachians
-
Catskill Mountains (1)
-
Northern Appalachians (46)
-
-
Canadian Shield
-
Superior Province
-
Abitibi Belt (1)
-
-
-
Humber Zone (3)
-
Saint Lawrence Lowlands (1)
-
Saint Lawrence River (1)
-
-
Russian Platform
-
Timan Ridge (1)
-
-
Saint John River (2)
-
South America
-
Amazonian Craton (2)
-
Argentina
-
Jujuy Argentina (1)
-
-
Bolivia (1)
-
Paraguay (1)
-
Venezuela (1)
-
-
South Mountain Batholith (1)
-
Spor Mountain (1)
-
United States
-
Alabama (1)
-
Arkansas (2)
-
California
-
Butte County California
-
Oroville California (1)
-
-
-
Colorado (1)
-
Delaware
-
Kent County Delaware (1)
-
-
Eastern U.S. (1)
-
Illinois (1)
-
Illinois Basin (1)
-
Kentucky (1)
-
Maine
-
Aroostook County Maine (16)
-
Hancock County Maine (4)
-
Norumbega fault zone (1)
-
Penobscot Bay (1)
-
Penobscot County Maine (7)
-
Piscataquis County Maine
-
Mount Katahdin (4)
-
-
Somerset County Maine (1)
-
Washington County Maine (7)
-
York County Maine (1)
-
-
Massachusetts
-
Suffolk County Massachusetts
-
Boston Massachusetts (1)
-
-
-
Minnesota (1)
-
Montana (1)
-
New England (11)
-
New Hampshire (5)
-
New Madrid region (1)
-
New York
-
Adirondack Mountains (2)
-
Catskill Mountains (1)
-
-
Newark Basin (1)
-
Ohio (1)
-
Oklahoma (1)
-
Rhode Island (1)
-
South Carolina
-
Charleston County South Carolina
-
Charleston South Carolina (1)
-
-
-
Tennessee (2)
-
Utah (1)
-
Vermont (2)
-
Virginia (1)
-
Washington
-
Pacific County Washington
-
Willapa Bay (1)
-
-
-
-
White Mountains (1)
-
Yucatan Peninsula (1)
-
-
commodities
-
barite deposits (2)
-
borate deposits (2)
-
brines (4)
-
diamond deposits (1)
-
energy sources (3)
-
evaporite deposits (2)
-
gems (1)
-
heavy mineral deposits (1)
-
limestone deposits (1)
-
metal ores
-
antimony ores (4)
-
base metals (22)
-
bismuth ores (1)
-
copper ores (29)
-
gold ores (19)
-
iron ores (6)
-
lead ores (17)
-
lead-zinc deposits (8)
-
manganese ores (1)
-
mercury ores (1)
-
molybdenum ores (13)
-
nickel ores (5)
-
niobium ores (2)
-
platinum ores (1)
-
polymetallic ores (14)
-
pyrite ores (1)
-
rare earth deposits (4)
-
silver ores (17)
-
tantalum ores (1)
-
tin ores (8)
-
tungsten ores (12)
-
vanadium ores (1)
-
zinc ores (17)
-
zirconium ores (1)
-
-
mineral deposits, genesis (83)
-
mineral exploration (48)
-
mineral resources (1)
-
oil and gas fields (1)
-
petroleum
-
natural gas (4)
-
-
potash (4)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (8)
-
C-14 (13)
-
organic carbon (2)
-
-
chemical ratios (9)
-
halogens
-
fluorine (4)
-
-
hydrogen
-
D/H (3)
-
deuterium (2)
-
-
isotope ratios (33)
-
isotopes
-
radioactive isotopes
-
Al-26 (1)
-
Be-10 (1)
-
C-14 (13)
-
Cs-137 (1)
-
Pb-206/Pb-204 (6)
-
Pb-207/Pb-204 (6)
-
Pb-208/Pb-204 (6)
-
Pb-210 (1)
-
Ra-226 (1)
-
Rb-87/Sr-86 (1)
-
Sm-147/Nd-144 (1)
-
-
stable isotopes
-
C-13/C-12 (8)
-
D/H (3)
-
deuterium (2)
-
Hf-177/Hf-176 (1)
-
Nd-144/Nd-143 (12)
-
O-18/O-16 (22)
-
Pb-206/Pb-204 (6)
-
Pb-207/Pb-204 (6)
-
Pb-208/Pb-204 (6)
-
Rb-87/Sr-86 (1)
-
S-34/S-32 (7)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (4)
-
-
-
metals
-
actinides
-
thorium (2)
-
uranium (3)
-
-
alkali metals
-
cesium
-
Cs-137 (1)
-
-
potassium (1)
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
-
alkaline earth metals
-
beryllium
-
Be-10 (1)
-
-
radium
-
Ra-226 (1)
-
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (4)
-
-
-
aluminum
-
Al-26 (1)
-
-
antimony (3)
-
arsenic (2)
-
cadmium (1)
-
copper (11)
-
gold (1)
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
indium (2)
-
iron (2)
-
lead
-
Pb-206/Pb-204 (6)
-
Pb-207/Pb-204 (6)
-
Pb-208/Pb-204 (6)
-
Pb-210 (1)
-
-
manganese (1)
-
molybdenum (2)
-
platinum group
-
palladium (2)
-
platinum ores (1)
-
-
rare earths
-
europium (1)
-
gadolinium (1)
-
lutetium (1)
-
neodymium
-
Nd-144/Nd-143 (12)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
scandium (1)
-
yttrium (1)
-
-
silver (1)
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tantalum (1)
-
tin (1)
-
titanium (2)
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tungsten (1)
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vanadium (2)
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zinc (7)
-
zirconium (1)
-
-
oxygen
-
O-18/O-16 (22)
-
-
phosphorus (2)
-
selenium (1)
-
sulfur
-
S-34/S-32 (7)
-
-
trace metals (4)
-
-
fossils
-
bacteria (1)
-
borings (1)
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burrows (6)
-
Chordata
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Vertebrata
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Agnatha (1)
-
Pisces
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Acanthodii
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Acanthodes (1)
-
-
Chondrichthyes (1)
-
Osteichthyes
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Actinopterygii (1)
-
Sarcopterygii
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Crossopterygii (1)
-
-
-
-
Tetrapoda
-
Amphibia
-
Labyrinthodontia
-
Anthracosauria (1)
-
Temnospondyli (1)
-
-
Lepospondyli (2)
-
-
Aves
-
Neornithes (1)
-
-
Mammalia
-
Theria
-
Eutheria
-
Proboscidea
-
Mastodontoidea (1)
-
-
-
-
-
Reptilia
-
Diapsida
-
Lepidosauria (1)
-
-
Synapsida
-
Therapsida
-
Cynodontia (1)
-
-
-
-
-
-
-
coprolites (2)
-
Graptolithina (3)
-
ichnofossils
-
Cruziana (1)
-
Palaeophycus (1)
-
Planolites (1)
-
Rusophycus (1)
-
Skolithos (3)
-
Trypanites (1)
-
-
Invertebrata
-
Archaeocyatha (1)
-
Arthropoda
-
Chelicerata
-
Arachnida (1)
-
Merostomata
-
Eurypterida (1)
-
-
-
Mandibulata
-
Crustacea
-
Malacostraca
-
Amphipoda (1)
-
-
Ostracoda
-
Podocopida (1)
-
-
-
Insecta
-
Pterygota
-
Neoptera
-
Endopterygota
-
Trichoptera (1)
-
-
-
-
-
Myriapoda (3)
-
-
Trilobitomorpha
-
Trilobita
-
Agnostida (1)
-
Phacopida
-
Phacopina (1)
-
-
-
-
-
Brachiopoda
-
Articulata
-
Orthida (2)
-
Pentamerida (1)
-
Strophomenida (1)
-
Terebratulida
-
Terebratulina (1)
-
-
-
-
Bryozoa (2)
-
Cnidaria
-
Anthozoa
-
Zoantharia
-
Tabulata
-
Favositida
-
Favositidae
-
Favosites (1)
-
-
-
Heliolitida
-
Heliolitidae
-
Heliolites (1)
-
-
-
-
-
-
Scyphozoa
-
Conulariida (1)
-
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (1)
-
-
-
Mollusca
-
Bivalvia
-
Palaeoheterodonta
-
Unionidae (2)
-
-
-
Cephalopoda
-
Ammonoidea (1)
-
Nautiloidea (1)
-
-
Gastropoda (4)
-
Hyolithes (1)
-
Tentaculitida
-
Tentaculitidae
-
Tentaculites (1)
-
-
-
-
Porifera
-
Stromatoporoidea (1)
-
-
Protista
-
Foraminifera
-
Textulariina
-
Lituolacea
-
Trochammina (1)
-
-
-
-
Thecamoeba (3)
-
-
Vermes
-
Annelida (2)
-
Phoronida (1)
-
-
-
microfossils
-
Chitinozoa (1)
-
Conodonta (9)
-
-
palynomorphs
-
acritarchs (3)
-
Chitinozoa (1)
-
miospores
-
pollen (5)
-
-
-
Plantae
-
algae (3)
-
Pteridophyta
-
Lycopsida (13)
-
Psilopsida (1)
-
Sphenopsida
-
Equisetales
-
Calamites (1)
-
-
-
-
Spermatophyta
-
Angiospermae
-
Dicotyledoneae
-
Acer (1)
-
-
-
Gymnospermae
-
Bennettitales (1)
-
Coniferales
-
Pinaceae
-
Pinus (1)
-
-
-
Cordaitales
-
Cordaites (1)
-
-
Cycadales (1)
-
Ginkgoales (1)
-
Pteridospermae (3)
-
-
-
-
problematic fossils (2)
-
thallophytes (1)
-
tracks (8)
-
trails (1)
-
-
geochronology methods
-
Ar/Ar (11)
-
exposure age (1)
-
fission-track dating (1)
-
K/Ar (3)
-
optical mineralogy (1)
-
paleomagnetism (24)
-
Pb/Th (1)
-
racemization (1)
-
Rb/Sr (6)
-
Sm/Nd (2)
-
tephrochronology (1)
-
Th/U (1)
-
thermochronology (1)
-
thermoluminescence (2)
-
U/Pb (37)
-
U/Th/Pb (2)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
upper Holocene (3)
-
-
Pleistocene
-
upper Pleistocene
-
Sangamonian (2)
-
Weichselian
-
upper Weichselian
-
Younger Dryas (1)
-
-
-
Wisconsinan
-
upper Wisconsinan (3)
-
-
-
-
upper Quaternary (2)
-
-
Tertiary
-
Neogene
-
Pliocene
-
upper Pliocene (1)
-
-
-
Paleogene
-
Paleocene
-
lower Paleocene (1)
-
-
-
-
-
Dalradian (1)
-
Laurentide ice sheet (3)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Gething Formation (1)
-
McMurray Formation (1)
-
Valanginian (1)
-
-
Upper Cretaceous (1)
-
-
Jurassic
-
Lower Jurassic
-
Hettangian (2)
-
lower Liassic (2)
-
Triassic-Jurassic boundary (1)
-
-
-
lower Mesozoic (5)
-
Newark Supergroup (3)
-
Triassic
-
Middle Triassic (1)
-
Upper Triassic
-
Carnian (3)
-
Norian (2)
-
Rhaetian (2)
-
Triassic-Jurassic boundary (1)
-
-
-
-
Paleozoic
-
Cambrian
-
Acadian (4)
-
Lower Cambrian
-
Terreneuvian (1)
-
Tommotian (1)
-
-
Middle Cambrian (5)
-
Upper Cambrian
-
Goldenville Formation (1)
-
-
-
Carboniferous
-
Albert Formation (12)
-
Lower Carboniferous
-
Dinantian (14)
-
-
Mabou Group (5)
-
Middle Carboniferous (1)
-
Mississippian
-
Lower Mississippian
-
Tournaisian (5)
-
-
Macumber Formation (2)
-
Middle Mississippian
-
Visean
-
upper Visean (1)
-
-
-
Upper Mississippian
-
Serpukhovian (1)
-
-
Windsor Group (15)
-
-
Namurian (5)
-
Pennsylvanian
-
Cumberland Group (10)
-
Joggins Formation (20)
-
Lower Pennsylvanian
-
Bashkirian (2)
-
-
-
Upper Carboniferous
-
Stephanian (1)
-
Westphalian (13)
-
-
-
Devonian
-
Lower Devonian
-
Battery Point Formation (1)
-
Emsian (8)
-
Gedinnian (1)
-
Lochkovian (1)
-
Pragian (1)
-
Seboomook Formation (1)
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York River Formation (1)
-
-
Middle Devonian
-
Eifelian (5)
-
-
Upper Devonian
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Famennian (1)
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Frasnian (2)
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Perry Formation (5)
-
-
-
Horton Group (7)
-
lower Paleozoic (7)
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Matapedia Group (2)
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Ordovician
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Davidsville Group (3)
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Gander Lake Group (3)
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Lower Ordovician
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Arenigian (2)
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Tremadocian
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Halifax Formation (1)
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-
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Meguma Group (1)
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Middle Ordovician
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Darriwilian (1)
-
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Miramichi Group (4)
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Tetagouche Group (32)
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Upper Ordovician
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Ashgillian (2)
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Katian (1)
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-
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Permian (12)
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Silurian
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Lower Silurian
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Llandovery (5)
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Wenlock (5)
-
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Upper Silurian
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Ludlow (2)
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Pridoli (2)
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-
-
upper Paleozoic
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Pictou Group (3)
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-
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Phanerozoic (1)
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Precambrian
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Archean (1)
-
upper Precambrian
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Proterozoic
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Athabasca Formation (1)
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Coldbrook Group (8)
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Mesoproterozoic
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Helikian (1)
-
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Neoproterozoic
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Cryogenian (2)
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Ediacaran (6)
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Tonian (1)
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Vendian (2)
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Paleoproterozoic (1)
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-
-
-
-
igneous rocks
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igneous rocks
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kimberlite (1)
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plutonic rocks
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diabase (2)
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diorites
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plagiogranite (1)
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quartz diorites (1)
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gabbros
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norite (3)
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troctolite (1)
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granites
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aplite (3)
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A-type granites (3)
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felsite (2)
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granite porphyry (1)
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I-type granites (2)
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leucogranite (2)
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rapakivi (1)
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granodiorites (6)
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lamprophyres
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minette (1)
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monzodiorite (1)
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pegmatite (5)
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syenites
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nepheline syenite (1)
-
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ultramafics
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peridotites
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lherzolite (1)
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-
-
-
porphyry (4)
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volcanic rocks
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andesites (3)
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basalts
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mid-ocean ridge basalts (2)
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ocean-island basalts (1)
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tholeiite (3)
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tholeiitic basalt (4)
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dacites (1)
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glasses (1)
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pyroclastics
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ignimbrite (2)
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pumice (1)
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tuff (6)
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rhyolites (21)
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trachytes (1)
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volcanic ash (1)
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metamorphic rocks
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metamorphic rocks
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cataclasites (1)
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granulites (1)
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hornfels (1)
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metaigneous rocks
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metabasalt (2)
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metagabbro (2)
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metaplutonic rocks (2)
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greisen (5)
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metavolcanic rocks (13)
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phyllites (1)
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turbidite (4)
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minerals
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borates
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carbonates
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halides
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minerals (22)
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oxides
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rutile (4)
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phosphates
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monazite (4)
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silicates
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chain silicates
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amphibole group
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clinoamphibole
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hornblende (2)
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-
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pyroxene group
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clinopyroxene (2)
-
-
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framework silicates
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feldspar group
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alkali feldspar
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K-feldspar (2)
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perthite (1)
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plagioclase
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albite (2)
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-
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scapolite group
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silica minerals
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zeolite group
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-
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orthosilicates
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topaz (5)
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zircon group
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zircon (34)
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sorosilicates
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epidote group
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epidote (1)
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pumpellyite group
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ring silicates
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sheet silicates
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sulfates
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tellurides (1)
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tungstates
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wolframite (2)
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-
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Primary terms
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absolute age (70)
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Africa
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Quebec
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carbon
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catalogs (3)
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Cenozoic
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upper Wisconsinan (3)
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Tertiary
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chemical analysis (3)
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Chordata
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Tetrapoda
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Aves
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Mammalia
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Theria
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Proboscidea
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Reptilia
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Diapsida
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Lepidosauria (1)
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Synapsida
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Cynodontia (1)
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clay mineralogy (4)
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Indian Ocean
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Invertebrata
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Insecta
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Brachiopoda
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Porifera
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Mesozoic
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
THROUGH FIRE, AND THROUGH WATER, AN ABUNDANCE OF MID-DEVONIAN CHARCOAL Open Access
Geochemistry, U-Pb geochronology and Nd-Hf isotopes of leucocratic dykes in the Cape Spencer area, southern New Brunswick, Canada: insights into the Alleghanian orogeny in the northern Appalachians Open Access
Crustal melting recorded by dykes along the gold-bearing Melanson Brook Fault, northern New Brunswick Appalachians Available to Purchase
To rush into the secret house of death: The fate of a Tournaisian plant Open Access
Review and tectonic interpretation of Precambrian Avalonia Available to Purchase
Abstract Avalonia, defined by its distinctive uppermost Ediacaran–Ordovician overstep sequence, extends from New England through Atlantic Canada to Wales. It unconformably overlies: (1) parts of one cratonic Neoproterozoic arc that which records several pulses at: 760–730 Ma, 680–600 Ma and 580–540 Ma; (2) an 800–760 Ma passive margin sequence; and (3) c. 976 Ma isolated plutons, possibly basement. Comparisons with modern arc dimensions suggest the dip of the Benioff Zone ranged from c. 22° W in Newfoundland to c. 52–67° elsewhere. A 600–580 Ma hiatus in arc magmatism in Cape Breton Island is attributed to overriding an oceanic plateau, leading to a 15° decrease in the dip of the Benioff Zone. The Collector magnetic anomaly along the Grand Banks and the Minas Fault is inferred to mark the Neoproterozoic southern margin of the Avalon Plate consisting of leaky transform faults and trench segments characterized by magnetite serpentinite mantle wedge beneath forearcs. The Minas Fault/Collector Anomaly connects similar arc units in Cape Breton Island and southern New Brunswick, suggesting that they were already offset by the Minas transform fault in the late Neoproterozoic. Similar tectonic, palaeomagnetic and isotopic data in the Timan Orogen of Baltica suggest that Avalonia may correlate with the Kipchak arc.
U–Pb zircon ages from tuffaceous beds in the Terreneuvian to Cambrian Series 2 sections of Avalonian southern New Brunswick, Canada: new constraints on chronostratigraphic correlations and the Cambrian time scale Available to Purchase
Abstract Avalonian sections in the Saint John area, southern New Brunswick, have long contributed to global understanding of Cambrian chronostratigraphy. A tuffaceous bed in the Ratcliffe Brook Formation (RBF) in the Somerset Street section dated at c. 531 Ma has traditionally been considered to post-date small shelly fossils attributed to the Watsonella crosbyi Zone in the Hanford Brook section. A fine-grained tuffaceous bed approximately 8 m stratigraphically lower in the Somerset Street section yields a chemical abrasion isotope dilution–thermal ionization mass spectrometry zircon age of 532.3 ± 0.3 Ma; a tuffaceous carbonate unit in the lower RBF in Hanford Brook gives an age of 531.5 ± 0.3 Ma. Crystal and crystal-lithic tuff beds near the top of the RBF yield ages of 520.3 ± 0.3 Ma (in Hanford Brook) and 519.1 ± 0.3 Ma (in Ratcliffe Brook). The new ages confirm the correlation between the Somerset Street and Hanford Brook sections based on acritarchs and make the association of small shelly fossils in the Hanford Brook section younger than 531 Ma. This result is relevant to ongoing discussions on the age of the base of undefined Cambrian Stage 2. The radiometric ages also support a young age for the upper part of the RBF, perhaps extending into Epoch 2.
Late Paleozoic igneous rocks at Clarke Head, Nova Scotia: magmatism at an arc to back-arc transition Available to Purchase
Abstract This study re-examines a reported mylonitic ‘metabasic granulite’ block in a megabreccia that is the most outboard igneous rock outcrop in the Avalon terrane, near the Meguma–Avalon terrane boundary in the northern Appalachians. The block of foliated gabbro is one of several igneous rock blocks in a largely dissolved salt wall and in style of deformation, mineralogy, lithogeochemistry and Sm/Nd isotopes resembles foliated and locally mylonitized late Devonian–early Carboniferous gabbro plutons along the Cobequid Shear Zone to the north. Garnet porphyroclasts in the foliated gabbro are exceptional, with a distinctive composition of Alm 55 Pyr 25 Grs 13 And 4 Sps 3 . Inclusions of pyroxene, andesine and ilmenite, lack of zoning and corroded rims suggest the garnets are antecrysts. Elsewhere in the world, garnets of similar composition in arc-related andesites are interpreted to be from disintegration of comagmatic cumulate material at 0.8–1.0 GPa under hydrous conditions. The Clarke Head foliated gabbro has two mafic components, one resembling arc-related hydrous magma and the other with tholeiitic back-arc character, similar to coeval rocks in the Cobequid Highlands. The gabbro is a product of complex mixing in crustal magma chambers and rapid rise of magma containing lower crustal antecrysts along strike-slip faults.
Description of a tetrapod trackway from the early Carboniferous Bonaventure Formation of New Brunswick, Canada Available to Purchase
Type material of Paraconularia planicostata (Dawson) from the Upper Mississippian of Nova Scotia, Atlantic Canada Open Access
New insights on faulting in southwest New Brunswick and northeast Maine based on marine magnetic mapping of the Ministers Island dyke Available to Purchase
Mineral Chemistry of the Eagle Lake Granite Porphyry, Southwestern New Brunswick, Canada: Implications for Cu-Mo-Au Mineralization Available to Purchase
A RECENTLY DISCOVERED TRACHYTE-HOSTED RARE EARTH ELEMENT-NIOBIUM-ZIRCONIUM OCCURRENCE IN NORTHERN MAINE, USA Open Access
Ontogeny of Euphanerops longaevus from the Upper Devonian Miguasha Fossil–Fish–Lagerstätte and comparison with the skeletogenesis of the sea lamprey Petromyzon marinus Available to Purchase
Precise U–Pb zircon dates from silicic super-eruptions during late Ediacaran extension in the Avalonian Caledonia terrane of southern New Brunswick, Canada Available to Purchase
APPLICATIONS OF PHOTOGRAMMETRY TO NEOICHNOLOGICAL STUDIES: THE SIGNIFICANCE OF SHOREBIRD TRACKWAY DISTRIBUTIONS AT THE BAY OF FUNDY Available to Purchase
U-Pb detrital zircon analysis of sedimentary rocks of the southeastern New England Avalon terrane in the U.S. Appalachians: Evidence for a separate crustal block Available to Purchase
ABSTRACT The Avalon terrane of southeastern New England is a composite terrane in which various crustal blocks may have different origins and/or tectonic histories. The northern part (west and north of Boston, Massachusetts) correlates well with Avalonian terranes in Newfoundland, Nova Scotia, and New Brunswick, Canada, based on rock types and ages, U-Pb detrital zircon signatures of metasedimentary rocks, and Sm-Nd isotope geochemistry data. In the south, fewer data exist, in part because of poorer rock exposure, and the origins and histories of the rocks are less well constrained. We conducted U-Pb laser ablation–inductively coupled plasma–mass spectrometry analysis on zircon from seven metasedimentary rock samples from multiple previously interpreted subterranes in order to constrain their origins. Two samples of Neoproterozoic Plainfield Formation quartzite from the previously interpreted Hope Valley subterrane in the southwestern part of the southeastern New England Avalon terrane and two from the Neoproterozoic Blackstone Group quartzite from the adjacent Esmond-Dedham subterrane to the east have Tonian youngest detrital zircon age populations. One sample of Cambrian North Attleboro Formation quartzite of the Esmond-Dedham subterrane yielded an Ediacaran youngest detrital zircon age population. Detrital zircon populations of all five samples include abundant Mesoproterozoic zircon and smaller Paleoproterozoic and Archean populations, and are similar to those of the northern part of the southeastern New England Avalon terrane and the Avalonian terranes in Canada. These are interpreted as having a Baltican/Amazonian affinity based primarily on published U-Pb and Lu-Hf detrital zircon data. Based on U-Pb detrital zircon data, there is no significant difference between the Hope Valley and Esmond-Dedham subterranes. Detrital zircon of two samples of the Price Neck and Newport Neck formations of the Neoproterozoic Newport Group in southern Rhode Island is characterized by large ca. 647–643 and ca. 745–733 Ma age populations and minor zircon up to ca. 3.1 Ga. This signature is most consistent with a northwest African affinity. The Newport Group may thus represent a subterrane, terrane, or other crustal block with a different origin and history than the southeastern New England Avalon terrane to the northwest. The boundary of this Newport Block may be restricted to the boundaries of the Newport Group, or it may extend as far north as Weymouth, Massachusetts, as far northwest as (but not including) the North Attleboro Formation quartzite and associated rocks in North Attleboro, Massachusetts, and as far west as Warwick, Rhode Island, where eastern exposures of the Blackstone Group quartzite exist. The Newport Block may have amalgamated with the Amazonian/Baltican part of the Avalon terrane prior to mid-Paleozoic amalgamation with Laurentia, or it may have arrived as a separate terrane after accretion of the Avalon terrane. Alternatively, it may have arrived during the formation of Pangea and been stranded after the breakup of Pangea, as has been proposed previously for rocks of the Georges Bank in offshore Massachusetts. If the latter is correct, then the boundary between the Newport Block and the southeastern New England Avalon terrane is the Pangean suture zone.
Geochemical and Nd isotopic constraints on the origin of uppermost Silurian rhyolitic rocks in the northern Appalachians (northern New Brunswick): Tectonic implications Available to Purchase
ABSTRACT Voluminous bimodal volcanic rocks of the Silurian (ca. 422–420 Ma) Dickie Cove Group in the Ganderia domain of northern New Brunswick, Canada, are subaerial units that were deposited in an extensional setting, with the mafic types corresponding to continental tholeiites. Felsic rocks are rhyolites with calc-alkaline affinities. They exhibit geochemical characteristics that are typical of A2-type felsic magmas, such as enrichments in the incompatible elements Zr, Nb, and Y, as well as high FeO*/(FeO* + MgO) and Ga/Al ratios. Their ε Nd ( t ) values are positive (+0.7 to +3.4) but lower than those of the associated basalts. Saturation thermometry has yielded average zircon crystallization temperature estimates for the rhyolites that are well above 900 °C. The geochemical data indicate that the felsic melts were likely sourced from heterogeneous Neoproterozoic lower crust and generated by dehydration melting triggered by heat derived from underplated mafic magma. Parent melts of the rhyolites underwent fractional crystallization in a complex magma chamber prior to eruption. The Nd isotopic data suggest that the lower crust of Ganderia is similar to that of Avalonia in northern mainland Nova Scotia, and that the two microcontinents shared a common Neoproterozoic history and origin as continental blocks rifted from neighboring parts of Gondwana. The tectono-magmatic setting of the Dickie Cove Group volcanic rocks is interpreted as being related to Pridolian, post-Salinic relaxation and slab breakoff, which generated volcanism initially constrained within the Chaleur zone of the Chaleur Bay synclinorium, a large domain of the northern Appalachians. This was followed later in the Pridolian by extensional collapse and widening of the area of magmatic activity, which then prograded into the Tobique zone farther to the southwest.
Insights from Lu-Hf zircon isotopic data on the crustal evolution of Avalonia and Ganderia in the northern Appalachian orogen Available to Purchase
ABSTRACT Avalonia and Ganderia are composite microcontinental fragments in the northern Appalachian orogen likely derived from Gondwanan sources. Avalonia includes numerous Neoproterozoic magmatic arc sequences that represent protracted and episodic subduction-related magmatism before deposition of an Ediacaran–Ordovician cover sequence of mainly siliciclastic rocks. We characterized the nature of the basement on which these arcs were constructed using zircon grains from arc-related magmatic rocks in Atlantic Canada that were analyzed for their Lu-Hf isotope composition. The majority of zircon grains from Avalonia are characterized by initial 176 Hf/ 177 Hf values that are more radiogenic than chondritic uniform reservoir, and calculated crust formation Hf T DM (i.e., depleted mantle) model ages range from 1.2 to 0.8 Ga. These data contrast with those from Ganderia, which show typically positive initial εHf values and Hf T DM model ages that imply magmatism was derived by melting of crustal sources with diverse ages ranging from ca. 1.8 to 1.0 Ga. The positive distribution of initial εHf values along with the pattern of Hf T DM model ages provide a clear record of two distinct subduction systems. Cryogenian–Ediacaran magmatism is interpreted to have resulted from reworking of an evolved Mesoproterozoic crustal component in a long-lived, subduction-dominated accretionary margin along the margin of northern Amazonia. A change in Hf isotope trajectory during the Ediacaran implies a greater contribution of isotopically evolved material consistent with an arc-arc–style collision of Ganderia with Avalonia. The shallow-sloping Hf isotopic pattern for Paleozoic Ganderian magmatism remains continuous for ~200 m.y., consistent with tectonic models of subduction in the Iapetus and Rheic Oceans and episodic accretion of juvenile crustal terranes to Laurentia.