- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Congo Democratic Republic (1)
-
-
East Africa
-
Afar Depression (1)
-
Ethiopia (1)
-
-
Madagascar
-
Antananarivo Madagascar (1)
-
-
Tibesti Massif (1)
-
West Africa
-
Nigeria
-
Jos Plateau (1)
-
-
-
-
Atlantic Ocean
-
North Atlantic (1)
-
-
Australasia
-
Australia
-
South Australia
-
Flinders Ranges (1)
-
Mount Painter Inlier (1)
-
-
Western Australia (1)
-
-
-
Avalon Zone (1)
-
Caledonides (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick (4)
-
Nova Scotia (4)
-
Prince Edward Island (1)
-
-
Newfoundland and Labrador
-
Newfoundland (2)
-
-
Ontario
-
Ottawa Ontario (1)
-
-
Quebec
-
Charlevoix (1)
-
Monteregian Hills (3)
-
Rouville County Quebec (1)
-
-
-
Western Canada
-
British Columbia (1)
-
Northwest Territories (2)
-
-
-
Cape Ann (1)
-
Coast Ranges (1)
-
Elba (1)
-
Europe
-
Alps (1)
-
Central Europe
-
Germany
-
Bavaria Germany (1)
-
-
Switzerland (1)
-
-
Pyrenees
-
Spanish Pyrenees (1)
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Castilla y Leon Spain
-
Salamanca Spain (1)
-
-
Spanish Pyrenees (1)
-
-
-
Italy (1)
-
-
Western Europe
-
Ireland (1)
-
-
-
Great Bay (1)
-
Green Mountains (3)
-
Indian Ocean
-
Red Sea (1)
-
-
Indian Ocean Islands
-
Kerguelen Islands (1)
-
Madagascar
-
Antananarivo Madagascar (1)
-
-
-
Mexico
-
Durango Mexico (1)
-
-
Mirror Lake (4)
-
North America
-
Appalachians
-
Catskill Mountains (2)
-
Northern Appalachians (11)
-
Southern Appalachians (1)
-
-
Canadian Shield
-
Grenville Province (2)
-
-
Great Lakes region (2)
-
-
Pikes Peak (1)
-
Red Hill (2)
-
South America
-
Brazil
-
Minas Gerais Brazil (1)
-
-
-
United States
-
Atlantic Coastal Plain (1)
-
Bronson Hill Anticlinorium (10)
-
California
-
Salton Sea (1)
-
San Diego County California (1)
-
-
Colorado
-
San Juan County Colorado (1)
-
-
Connecticut
-
Fairfield County Connecticut (1)
-
-
Connecticut Valley (4)
-
District of Columbia (1)
-
Eastern U.S.
-
Northeastern U.S. (1)
-
-
Florida (1)
-
Georgia
-
Fulton County Georgia
-
Atlanta Georgia (1)
-
-
-
Illinois (1)
-
Kentucky (1)
-
Maine
-
Cumberland County Maine (1)
-
Piscataquis County Maine
-
Mount Katahdin (2)
-
-
York County Maine (1)
-
-
Massachusetts
-
Franklin County Massachusetts (3)
-
Hampden County Massachusetts (1)
-
Hampshire County Massachusetts (1)
-
Middlesex County Massachusetts (1)
-
Plymouth County Massachusetts (1)
-
Suffolk County Massachusetts
-
Boston Massachusetts (3)
-
-
Worcester County Massachusetts (2)
-
-
Merrimack Synclinorium (3)
-
Michigan (2)
-
Midwest (1)
-
Minnesota (3)
-
Montana
-
Silver Bow County Montana
-
Butte Montana (1)
-
-
-
Nevada (1)
-
New England (35)
-
New Hampshire
-
Belknap County New Hampshire (4)
-
Carroll County New Hampshire
-
Ossipee Mountains (3)
-
-
Cheshire County New Hampshire (10)
-
Coos County New Hampshire (13)
-
Grafton County New Hampshire (44)
-
Hillsborough County New Hampshire
-
Manchester New Hampshire (3)
-
-
Hubbard Brook experimental forest (1)
-
Merrimack County New Hampshire (5)
-
Rockingham County New Hampshire (3)
-
Strafford County New Hampshire (1)
-
Sullivan County New Hampshire (4)
-
-
New Jersey (1)
-
New Madrid region (1)
-
New Mexico (1)
-
New York
-
Adirondack Mountains (4)
-
Catskill Mountains (2)
-
New York City New York (1)
-
-
North Carolina (1)
-
Ohio (1)
-
Oklahoma (1)
-
Pennsylvania (1)
-
Rhode Island (8)
-
South Carolina
-
Charleston County South Carolina
-
Charleston South Carolina (1)
-
-
-
South Dakota
-
Pennington County South Dakota (2)
-
-
Vermont
-
Orange County Vermont (3)
-
Washington County Vermont (1)
-
Windham County Vermont (3)
-
Windsor County Vermont (1)
-
-
Virginia (2)
-
Wisconsin (2)
-
Wyoming (1)
-
Wyoming Province (1)
-
-
White Mountains (21)
-
-
commodities
-
gems (2)
-
metal ores
-
copper ores (1)
-
lead-zinc deposits (1)
-
polymetallic ores (1)
-
uranium ores (2)
-
-
mineral deposits, genesis (3)
-
potash (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
C-14 (2)
-
organic carbon (1)
-
-
chemical ratios (1)
-
halogens
-
fluorine (2)
-
-
hydrogen (1)
-
isotope ratios (2)
-
isotopes
-
radioactive isotopes
-
Al-26 (1)
-
Be-10 (2)
-
Be-7 (1)
-
C-14 (2)
-
Cs-137 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Pb-210 (1)
-
Rb-87/Sr-86 (1)
-
Sm-147/Nd-144 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Rb-87/Sr-86 (1)
-
S-34/S-32 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (3)
-
-
-
metals
-
actinides
-
uranium (2)
-
-
alkali metals
-
cesium
-
Cs-137 (1)
-
-
lithium (4)
-
potassium (2)
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
sodium (1)
-
-
alkaline earth metals
-
beryllium
-
Be-10 (2)
-
Be-7 (1)
-
-
calcium (1)
-
magnesium (1)
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
aluminum
-
Al-26 (1)
-
-
antimony (1)
-
arsenic (3)
-
bismuth (1)
-
cadmium (1)
-
chromium (1)
-
cobalt (1)
-
copper (1)
-
iron
-
ferric iron (2)
-
ferrous iron (1)
-
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Pb-210 (1)
-
-
manganese (3)
-
mercury (1)
-
molybdenum (1)
-
nickel (1)
-
niobium (1)
-
rare earths
-
lanthanum (1)
-
neodymium
-
Nd-144/Nd-143 (1)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
scandium (1)
-
ytterbium (1)
-
yttrium (1)
-
-
tantalum (1)
-
tin (1)
-
titanium (1)
-
vanadium (1)
-
zinc (1)
-
zirconium (1)
-
-
noble gases
-
helium (1)
-
-
oxygen
-
O-18/O-16 (1)
-
-
phosphorus (1)
-
selenium (1)
-
sulfur
-
S-34/S-32 (2)
-
-
-
fossils
-
Invertebrata
-
Brachiopoda (2)
-
-
-
geochronology methods
-
Ar/Ar (5)
-
exposure age (1)
-
fission-track dating (4)
-
K/Ar (3)
-
Pb/Th (1)
-
Rb/Sr (4)
-
U/Pb (9)
-
U/Th/Pb (4)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene
-
Weichselian
-
upper Weichselian
-
Bolling (1)
-
-
-
Wisconsinan (3)
-
-
-
-
Tertiary (1)
-
-
Laurentide ice sheet (3)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (1)
-
Upper Cretaceous (2)
-
-
Jurassic
-
Lower Jurassic (1)
-
-
Triassic
-
Upper Triassic (1)
-
-
-
Paleozoic
-
Bucksport Formation (1)
-
Cambrian
-
Acadian (3)
-
Middle Cambrian (3)
-
-
Cape Elizabeth Formation (1)
-
Carboniferous
-
Mississippian (1)
-
Pennsylvanian (1)
-
-
Casco Bay Group (1)
-
Devonian
-
Lower Devonian
-
Emsian (1)
-
Littleton Formation (7)
-
-
-
lower Paleozoic
-
Berwick Formation (1)
-
Penobscot Formation (1)
-
-
Merrimack Group (2)
-
middle Paleozoic (1)
-
Ordovician
-
Middle Ordovician
-
Ammonoosuc Volcanics (10)
-
Partridge Formation (1)
-
-
Miramichi Group (1)
-
Upper Ordovician (1)
-
-
Permian (3)
-
Rangeley Formation (3)
-
Silurian
-
Middle Silurian (1)
-
Perry Mountain Formation (2)
-
-
upper Paleozoic (1)
-
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic (2)
-
-
-
-
-
igneous rocks
-
igneous rocks
-
hypabyssal rocks (1)
-
plutonic rocks
-
alnoite (1)
-
diorites
-
tonalite (1)
-
trondhjemite (2)
-
-
gabbros (1)
-
granites
-
aplite (1)
-
felsite (1)
-
two-mica granite (1)
-
-
granodiorites (3)
-
lamprophyres
-
camptonite (2)
-
monchiquite (1)
-
-
monzonites (2)
-
pegmatite (26)
-
syenites
-
quartz syenite (3)
-
-
-
volcanic rocks
-
andesites (1)
-
basalts
-
alkali basalts
-
alkali olivine basalt (1)
-
-
tholeiite (1)
-
-
basanite (1)
-
dacites (1)
-
rhyolites (2)
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (1)
-
gneisses
-
granite gneiss (2)
-
tonalite gneiss (1)
-
-
granulites (1)
-
metaigneous rocks
-
metabasalt (1)
-
metatuff (1)
-
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
metaconglomerate (1)
-
metapelite (2)
-
-
metavolcanic rocks (5)
-
migmatites (2)
-
phyllonites (1)
-
quartzites (3)
-
schists (8)
-
slates (4)
-
-
-
minerals
-
arsenides
-
arsenopyrite (1)
-
-
carbonates
-
calcite (1)
-
-
halides
-
chlorides (1)
-
fluorides
-
topaz (1)
-
-
-
hydrates (1)
-
manganese minerals (1)
-
minerals (17)
-
native elements
-
graphite (2)
-
-
oxides
-
chrysoberyl (1)
-
gibbsite (1)
-
hydroxides
-
schoepite (2)
-
-
ilmenite (1)
-
magnetite (2)
-
pseudobrookite (1)
-
tantalates
-
tantalite (1)
-
-
uraninite (3)
-
-
phosphates
-
apatite (9)
-
goyazite (1)
-
graftonite (4)
-
lazulite (1)
-
monazite (3)
-
sarcopside (5)
-
triphylite (3)
-
vivianite (1)
-
whitlockite (3)
-
xenotime (1)
-
-
silicates
-
aluminosilicates (1)
-
chain silicates
-
amphibole group
-
alkalic amphibole (1)
-
clinoamphibole
-
actinolite (1)
-
arfvedsonite (2)
-
hornblende (2)
-
riebeckite (1)
-
-
orthoamphibole
-
gedrite (1)
-
-
-
pyroxene group (3)
-
-
framework silicates
-
danburite (1)
-
feldspar group
-
alkali feldspar
-
anorthoclase (1)
-
K-feldspar (3)
-
microcline (1)
-
perthite (2)
-
-
plagioclase
-
albite (1)
-
anorthite (1)
-
-
-
scapolite group
-
scapolite (1)
-
-
silica minerals
-
quartz (3)
-
-
sodalite group
-
genthelvite (1)
-
helvite (1)
-
sodalite (1)
-
-
zeolite group
-
pollucite (1)
-
-
-
orthosilicates
-
nesosilicates
-
andalusite (1)
-
garnet group
-
almandine (1)
-
-
kyanite (1)
-
sillimanite (3)
-
staurolite (2)
-
topaz (1)
-
zircon group
-
zircon (13)
-
-
-
sorosilicates
-
chevkinite group
-
chevkinite (1)
-
-
vesuvianite (2)
-
-
-
ring silicates
-
beryl (2)
-
cordierite (1)
-
-
sheet silicates
-
chlorite group
-
chamosite (1)
-
-
clay minerals
-
kaolinite (1)
-
-
mica group
-
biotite (6)
-
fuchsite (1)
-
lepidolite (1)
-
muscovite (3)
-
-
-
-
sulfides
-
arsenopyrite (1)
-
genthelvite (1)
-
helvite (1)
-
sphalerite (1)
-
-
-
Primary terms
-
absolute age (21)
-
Africa
-
Central Africa
-
Congo Democratic Republic (1)
-
-
East Africa
-
Afar Depression (1)
-
Ethiopia (1)
-
-
Madagascar
-
Antananarivo Madagascar (1)
-
-
Tibesti Massif (1)
-
West Africa
-
Nigeria
-
Jos Plateau (1)
-
-
-
-
Atlantic Ocean
-
North Atlantic (1)
-
-
Australasia
-
Australia
-
South Australia
-
Flinders Ranges (1)
-
Mount Painter Inlier (1)
-
-
Western Australia (1)
-
-
-
bibliography (5)
-
biogeography (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick (4)
-
Nova Scotia (4)
-
Prince Edward Island (1)
-
-
Newfoundland and Labrador
-
Newfoundland (2)
-
-
Ontario
-
Ottawa Ontario (1)
-
-
Quebec
-
Charlevoix (1)
-
Monteregian Hills (3)
-
Rouville County Quebec (1)
-
-
-
Western Canada
-
British Columbia (1)
-
Northwest Territories (2)
-
-
-
carbon
-
C-13/C-12 (1)
-
C-14 (2)
-
organic carbon (1)
-
-
catalogs (1)
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene
-
Weichselian
-
upper Weichselian
-
Bolling (1)
-
-
-
Wisconsinan (3)
-
-
-
-
Tertiary (1)
-
-
chemical analysis (3)
-
clay mineralogy (1)
-
climate change (2)
-
crust (7)
-
crystal chemistry (8)
-
crystal growth (3)
-
crystal structure (21)
-
crystallography (4)
-
dams (1)
-
data processing (2)
-
deformation (6)
-
diagenesis (1)
-
earthquakes (17)
-
ecology (1)
-
economic geology (6)
-
education (2)
-
Europe
-
Alps (1)
-
Central Europe
-
Germany
-
Bavaria Germany (1)
-
-
Switzerland (1)
-
-
Pyrenees
-
Spanish Pyrenees (1)
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Castilla y Leon Spain
-
Salamanca Spain (1)
-
-
Spanish Pyrenees (1)
-
-
-
Italy (1)
-
-
Western Europe
-
Ireland (1)
-
-
-
explosions (6)
-
faults (33)
-
folds (21)
-
foliation (2)
-
fractures (7)
-
gems (2)
-
geochemistry (20)
-
geochronology (14)
-
geomorphology (7)
-
geophysical methods (13)
-
glacial geology (14)
-
ground water (5)
-
heat flow (1)
-
hydrogen (1)
-
hydrology (3)
-
igneous rocks
-
hypabyssal rocks (1)
-
plutonic rocks
-
alnoite (1)
-
diorites
-
tonalite (1)
-
trondhjemite (2)
-
-
gabbros (1)
-
granites
-
aplite (1)
-
felsite (1)
-
two-mica granite (1)
-
-
granodiorites (3)
-
lamprophyres
-
camptonite (2)
-
monchiquite (1)
-
-
monzonites (2)
-
pegmatite (26)
-
syenites
-
quartz syenite (3)
-
-
-
volcanic rocks
-
andesites (1)
-
basalts
-
alkali basalts
-
alkali olivine basalt (1)
-
-
tholeiite (1)
-
-
basanite (1)
-
dacites (1)
-
rhyolites (2)
-
-
-
Indian Ocean
-
Red Sea (1)
-
-
Indian Ocean Islands
-
Kerguelen Islands (1)
-
Madagascar
-
Antananarivo Madagascar (1)
-
-
-
intrusions (58)
-
Invertebrata
-
Brachiopoda (2)
-
-
isostasy (1)
-
isotopes
-
radioactive isotopes
-
Al-26 (1)
-
Be-10 (2)
-
Be-7 (1)
-
C-14 (2)
-
Cs-137 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Pb-210 (1)
-
Rb-87/Sr-86 (1)
-
Sm-147/Nd-144 (1)
-
-
stable isotopes
-
C-13/C-12 (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (1)
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Rb-87/Sr-86 (1)
-
S-34/S-32 (2)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (3)
-
-
-
lava (1)
-
lineation (1)
-
magmas (34)
-
mantle (1)
-
maps (36)
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (1)
-
Upper Cretaceous (2)
-
-
Jurassic
-
Lower Jurassic (1)
-
-
Triassic
-
Upper Triassic (1)
-
-
-
metal ores
-
copper ores (1)
-
lead-zinc deposits (1)
-
polymetallic ores (1)
-
uranium ores (2)
-
-
metals
-
actinides
-
uranium (2)
-
-
alkali metals
-
cesium
-
Cs-137 (1)
-
-
lithium (4)
-
potassium (2)
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
sodium (1)
-
-
alkaline earth metals
-
beryllium
-
Be-10 (2)
-
Be-7 (1)
-
-
calcium (1)
-
magnesium (1)
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
aluminum
-
Al-26 (1)
-
-
antimony (1)
-
arsenic (3)
-
bismuth (1)
-
cadmium (1)
-
chromium (1)
-
cobalt (1)
-
copper (1)
-
iron
-
ferric iron (2)
-
ferrous iron (1)
-
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Pb-210 (1)
-
-
manganese (3)
-
mercury (1)
-
molybdenum (1)
-
nickel (1)
-
niobium (1)
-
rare earths
-
lanthanum (1)
-
neodymium
-
Nd-144/Nd-143 (1)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
scandium (1)
-
ytterbium (1)
-
yttrium (1)
-
-
tantalum (1)
-
tin (1)
-
titanium (1)
-
vanadium (1)
-
zinc (1)
-
zirconium (1)
-
-
metamorphic rocks
-
amphibolites (1)
-
gneisses
-
granite gneiss (2)
-
tonalite gneiss (1)
-
-
granulites (1)
-
metaigneous rocks
-
metabasalt (1)
-
metatuff (1)
-
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
metaconglomerate (1)
-
metapelite (2)
-
-
metavolcanic rocks (5)
-
migmatites (2)
-
phyllonites (1)
-
quartzites (3)
-
schists (8)
-
slates (4)
-
-
metamorphism (48)
-
metasomatism (5)
-
Mexico
-
Durango Mexico (1)
-
-
mineral deposits, genesis (3)
-
mineralogy (50)
-
minerals (17)
-
noble gases
-
helium (1)
-
-
North America
-
Appalachians
-
Catskill Mountains (2)
-
Northern Appalachians (11)
-
Southern Appalachians (1)
-
-
Canadian Shield
-
Grenville Province (2)
-
-
Great Lakes region (2)
-
-
ocean waves (1)
-
orogeny (22)
-
oxygen
-
O-18/O-16 (1)
-
-
paleoclimatology (3)
-
paleoecology (1)
-
paleogeography (2)
-
paleontology (4)
-
Paleozoic
-
Bucksport Formation (1)
-
Cambrian
-
Acadian (3)
-
Middle Cambrian (3)
-
-
Cape Elizabeth Formation (1)
-
Carboniferous
-
Mississippian (1)
-
Pennsylvanian (1)
-
-
Casco Bay Group (1)
-
Devonian
-
Lower Devonian
-
Emsian (1)
-
Littleton Formation (7)
-
-
-
lower Paleozoic
-
Berwick Formation (1)
-
Penobscot Formation (1)
-
-
Merrimack Group (2)
-
middle Paleozoic (1)
-
Ordovician
-
Middle Ordovician
-
Ammonoosuc Volcanics (10)
-
Partridge Formation (1)
-
-
Miramichi Group (1)
-
Upper Ordovician (1)
-
-
Permian (3)
-
Rangeley Formation (3)
-
Silurian
-
Middle Silurian (1)
-
Perry Mountain Formation (2)
-
-
upper Paleozoic (1)
-
-
paragenesis (5)
-
permafrost (2)
-
petrology (57)
-
phase equilibria (8)
-
phosphorus (1)
-
plate tectonics (12)
-
pollution (4)
-
potash (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic (2)
-
-
-
-
reclamation (1)
-
rock mechanics (2)
-
sedimentary petrology (5)
-
sedimentary rocks
-
chemically precipitated rocks
-
chert (1)
-
evaporites (1)
-
-
clastic rocks
-
shale (1)
-
-
-
sedimentary structures
-
secondary structures
-
concretions (1)
-
-
soft sediment deformation
-
slump structures (1)
-
-
-
sedimentation (6)
-
sediments
-
clastic sediments
-
colluvium (1)
-
drift (1)
-
pebbles (1)
-
sand (2)
-
till (8)
-
-
-
seismology (11)
-
selenium (1)
-
shorelines (1)
-
soil mechanics (1)
-
soils (2)
-
South America
-
Brazil
-
Minas Gerais Brazil (1)
-
-
-
spectroscopy (1)
-
stratigraphy (5)
-
structural analysis (6)
-
structural geology (11)
-
sulfur
-
S-34/S-32 (2)
-
-
tectonics
-
neotectonics (1)
-
-
tectonophysics (1)
-
United States
-
Atlantic Coastal Plain (1)
-
Bronson Hill Anticlinorium (10)
-
California
-
Salton Sea (1)
-
San Diego County California (1)
-
-
Colorado
-
San Juan County Colorado (1)
-
-
Connecticut
-
Fairfield County Connecticut (1)
-
-
Connecticut Valley (4)
-
District of Columbia (1)
-
Eastern U.S.
-
Northeastern U.S. (1)
-
-
Florida (1)
-
Georgia
-
Fulton County Georgia
-
Atlanta Georgia (1)
-
-
-
Illinois (1)
-
Kentucky (1)
-
Maine
-
Cumberland County Maine (1)
-
Piscataquis County Maine
-
Mount Katahdin (2)
-
-
York County Maine (1)
-
-
Massachusetts
-
Franklin County Massachusetts (3)
-
Hampden County Massachusetts (1)
-
Hampshire County Massachusetts (1)
-
Middlesex County Massachusetts (1)
-
Plymouth County Massachusetts (1)
-
Suffolk County Massachusetts
-
Boston Massachusetts (3)
-
-
Worcester County Massachusetts (2)
-
-
Merrimack Synclinorium (3)
-
Michigan (2)
-
Midwest (1)
-
Minnesota (3)
-
Montana
-
Silver Bow County Montana
-
Butte Montana (1)
-
-
-
Nevada (1)
-
New England (35)
-
New Hampshire
-
Belknap County New Hampshire (4)
-
Carroll County New Hampshire
-
Ossipee Mountains (3)
-
-
Cheshire County New Hampshire (10)
-
Coos County New Hampshire (13)
-
Grafton County New Hampshire (44)
-
Hillsborough County New Hampshire
-
Manchester New Hampshire (3)
-
-
Hubbard Brook experimental forest (1)
-
Merrimack County New Hampshire (5)
-
Rockingham County New Hampshire (3)
-
Strafford County New Hampshire (1)
-
Sullivan County New Hampshire (4)
-
-
New Jersey (1)
-
New Madrid region (1)
-
New Mexico (1)
-
New York
-
Adirondack Mountains (4)
-
Catskill Mountains (2)
-
New York City New York (1)
-
-
North Carolina (1)
-
Ohio (1)
-
Oklahoma (1)
-
Pennsylvania (1)
-
Rhode Island (8)
-
South Carolina
-
Charleston County South Carolina
-
Charleston South Carolina (1)
-
-
-
South Dakota
-
Pennington County South Dakota (2)
-
-
Vermont
-
Orange County Vermont (3)
-
Washington County Vermont (1)
-
Windham County Vermont (3)
-
Windsor County Vermont (1)
-
-
Virginia (2)
-
Wisconsin (2)
-
Wyoming (1)
-
Wyoming Province (1)
-
-
weathering (4)
-
X-ray analysis (1)
-
-
rock formations
-
Madrid Formation (1)
-
Rye Complex (1)
-
-
sedimentary rocks
-
flysch (1)
-
sedimentary rocks
-
chemically precipitated rocks
-
chert (1)
-
evaporites (1)
-
-
clastic rocks
-
shale (1)
-
-
-
-
sedimentary structures
-
channels (1)
-
sedimentary structures
-
secondary structures
-
concretions (1)
-
-
soft sediment deformation
-
slump structures (1)
-
-
-
stratification (1)
-
-
sediments
-
sediments
-
clastic sediments
-
colluvium (1)
-
drift (1)
-
pebbles (1)
-
sand (2)
-
till (8)
-
-
-
-
soils
-
soils (2)
-
Spodosols (1)
-
New Hampshire
ABSTRACT The Ordovician Bronson Hill arc and Silurian–Devonian Central Maine basin are integral tectonic elements of the northern Appalachian Mountains (USA). However, understanding the evolution of, and the relationship between, these two domains has been challenging due to complex field relationships, overprinting associated with multiple phases of Paleozoic orogenesis, and a paucity of geochronologic dates. To constrain the nature of this boundary, and the tectonic evolution of the northern Appalachians, we present U-Pb zircon dates from 24 samples in the context of detailed mapping in northern New Hampshire and western Maine. Collectively, the new geochronology and mapping results constrain the timing of magmatism, sedimentation, metamorphism, and deformation. The Bronson Hill arc formed on Gondwana-derived basement and experienced prolonged magmatic activity before and after a ca. 460 Ma reversal in subduction polarity following its accretion to Laurentia in the Middle Ordovician Taconic orogeny. Local Silurian deformation between ca. 441 and 434 Ma may have been related to the last stages of the Taconic orogeny or the Late Ordovician to early Silurian Salinic orogeny. Silurian Central Maine basin units are dominated by local, arc-derived zircon grains, suggestive of a convergent margin setting. Devonian Central Maine basin units contain progressively larger proportions of older, outboard, and basement-derived zircon, associated with the onset of the collisional Early Devonian Acadian orogeny at ca. 410 Ma. Both the Early Devonian Acadian and Middle Devonian to early Carboniferous Neoacadian orogenies were associated with protracted amphibolite-facies metamorphism and magmatism, the latter potentially compatible with the hypothesized Acadian altiplano orogenic plateau. The final configuration of the Jefferson dome formed during the Carboniferous via normal faulting, possibly related to diapirism and/or ductile thinning and extrusion. We interpret the boundary between the Bronson Hill arc and the Central Maine basin to be a pre-Acadian normal fault on which dip was later reversed by dome-stage tectonism. This implies that the classic mantled gneiss domes of the Bronson Hill anticlinorium formed relatively late, during or after the Neoacadian orogeny, and that this process may have separated the once-contiguous Central Maine and Connecticut Valley basins.
Impact of stream power gradients on storage of sediment and carbon on channel margins and floodplains
Onset of long-lived silicic and alkaline magmatism in eastern North America preceded Central Atlantic Magmatic Province emplacement
Paleozoic evolution of crustal thickness and elevation in the northern Appalachian orogen, USA
ABSTRACT The northward retreat history of the Laurentide ice sheet through the lowlands of the northeastern United States during the last deglaciation is well constrained, but its vertical thinning history is less well known because of the lack of direct constraints on ice thickness through time and space. In addition, the highest elevations in New England are characterized by gently sloping upland surfaces and weathered block fields, features with an uncertain history. To better constrain ice-sheet history in this area and its relationship to alpine geomorphology, we present 20 new 10 Be and seven in situ 14 C cosmogenic nuclide measurements along an elevation transect at Mount Washington, New Hampshire, the highest mountain in the northeastern United States (1917 m above sea level [a.s.l.]). Our results suggest substantially different exposure and erosion histories on the upper and lower parts of the mountain. Above 1600 m a.s.l., 10 Be and in situ 14 C measurements are consistent with upper reaches of the mountain deglaciating by 18 ka. However, some 10 Be ages are up to several times greater than the age of the last deglaciation, consistent with weakly erosive, cold-based ice that did not deeply erode preglacial surfaces. Below 1600 m a.s.l., 10 Be ages are indistinguishable over a nearly 900 m range in elevation and imply rapid ice-surface lowering ca. 14.1 ± 1.1 ka (1 standard deviation; n = 9). This shift from slow thinning early in the deglaciation on the upper part of the mountain to abrupt thinning across the lower elevations coincided with accelerated ice-margin retreat through the region recorded by Connecticut River valley varve records during the Bølling interstadial. The Mount Washington cosmogenic nuclide vertical transect and the Connecticut River valley varve record, along with other New England cosmogenic nuclide records, suggest rapid ice-volume loss in the interior northeastern United States in response to Bølling warming.