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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Sudan (1)
-
-
Southern Africa
-
Barberton greenstone belt (1)
-
Kaapvaal Craton (1)
-
South Africa (2)
-
-
-
Antarctica
-
Antarctic ice sheet (1)
-
Transantarctic Mountains (1)
-
-
Arctic region
-
Greenland (1)
-
-
Asia
-
Far East
-
China (1)
-
-
Popigay Structure (2)
-
Siberian Platform
-
Aldan Shield (1)
-
Anabar Shield (1)
-
-
Yakutia Russian Federation
-
Anabar Shield (1)
-
-
-
Atlantic Ocean
-
Equatorial Atlantic (1)
-
North Atlantic
-
Ceara Rise (1)
-
North Sea (1)
-
-
South Atlantic (1)
-
-
Australasia
-
Australia
-
South Australia
-
Gawler Craton (1)
-
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Western Australia
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Hamersley Basin (1)
-
-
-
Papua New Guinea
-
New Britain (1)
-
-
-
Canada
-
Eastern Canada
-
Ontario (1)
-
-
Nunavut
-
Haughton impact structure (2)
-
-
Western Canada
-
Northwest Territories
-
Tuktoyaktuk Peninsula (1)
-
-
-
-
Chesapeake Bay impact structure (2)
-
Chicxulub Crater (5)
-
Commonwealth of Independent States
-
Russian Federation
-
Chelyabinsk Russian Federation (1)
-
Murmansk Russian Federation
-
Kola Peninsula (1)
-
-
Popigay Structure (2)
-
Siberian Platform
-
Aldan Shield (1)
-
Anabar Shield (1)
-
-
Yakutia Russian Federation
-
Anabar Shield (1)
-
-
-
Ukraine
-
Boltyshka Depression (1)
-
-
-
Europe
-
Fennoscandian Shield (1)
-
Murmansk Russian Federation
-
Kola Peninsula (1)
-
-
Southern Europe
-
Italy
-
Apennines (1)
-
Marches Italy
-
Ancona Italy
-
Massignano Italy (1)
-
-
-
Umbria Italy
-
Perugia Italy
-
Gubbio Italy (2)
-
-
-
-
-
Ukraine
-
Boltyshka Depression (1)
-
-
Western Europe
-
Belgium (1)
-
France
-
Rochechouart Crater (1)
-
-
Scandinavia
-
Sweden
-
Dalarna Sweden
-
Siljan Ring (2)
-
-
Jamtland Sweden
-
Lockne Crater (1)
-
-
-
-
-
-
Indian Ocean
-
Ninetyeast Ridge (1)
-
-
Mediterranean region (1)
-
Mexico (3)
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North America
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Williston Basin (1)
-
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Clarion fracture zone (1)
-
Clipperton fracture zone (1)
-
-
-
North Pacific
-
Northeast Pacific
-
Clarion fracture zone (1)
-
Clipperton fracture zone (1)
-
-
-
West Pacific
-
Ontong Java Plateau (1)
-
-
-
polar regions (1)
-
United States
-
Arizona
-
Coconino County Arizona (1)
-
-
California
-
Inyo County California (1)
-
-
Death Valley National Park (1)
-
Iowa
-
Manson impact structure (1)
-
-
Missouri River (1)
-
Montana
-
Dawson County Montana (1)
-
-
Virginia (1)
-
-
Yucatan Peninsula (1)
-
-
commodities
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aggregate (2)
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brines (1)
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energy sources (2)
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metal ores
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aluminum ores (1)
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iron ores (1)
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-
mineral deposits, genesis (1)
-
mineral exploration (1)
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mineral resources (2)
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refractory materials (6)
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water resources (1)
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-
elements, isotopes
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carbon
-
C-13/C-12 (2)
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-
chemical elements (4)
-
halogens
-
chlorine
-
Cl-37/Cl-35 (1)
-
-
fluorine (1)
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iodine
-
I-129 (1)
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-
-
hydrogen
-
D/H (3)
-
-
isotope ratios (18)
-
isotopes
-
radioactive isotopes
-
Al-26 (3)
-
I-129 (1)
-
Mn-53 (1)
-
Re-187/Os-188 (1)
-
-
stable isotopes
-
Ar-36 (1)
-
C-13/C-12 (2)
-
Cl-37/Cl-35 (1)
-
Cr-53/Cr-52 (2)
-
D/H (3)
-
Fe-56/Fe-54 (1)
-
Fe-57 (1)
-
He-3 (4)
-
Mg-25/Mg-24 (1)
-
Mg-26 (1)
-
Ne-21 (1)
-
O-16 (1)
-
O-17 (1)
-
O-17/O-16 (2)
-
O-18 (1)
-
O-18/O-16 (5)
-
Os-188/Os-187 (2)
-
Pb-207/Pb-206 (1)
-
Re-187/Os-188 (1)
-
S-34/S-32 (1)
-
Sr-87/Sr-86 (1)
-
Xe-129 (1)
-
-
-
metals
-
alkali metals
-
potassium (1)
-
-
alkaline earth metals
-
calcium (1)
-
magnesium
-
Mg-25/Mg-24 (1)
-
Mg-26 (1)
-
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
aluminum
-
Al-26 (3)
-
-
chromium
-
Cr-53/Cr-52 (2)
-
-
gold (1)
-
iron
-
Fe-56/Fe-54 (1)
-
Fe-57 (1)
-
ferric iron (3)
-
ferrous iron (3)
-
-
lead
-
Pb-207/Pb-206 (1)
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manganese
-
Mn-53 (1)
-
-
nickel (2)
-
platinum group
-
iridium (4)
-
osmium
-
Os-188/Os-187 (2)
-
Re-187/Os-188 (1)
-
-
-
rare earths
-
europium (2)
-
-
rhenium
-
Re-187/Os-188 (1)
-
-
tin (1)
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titanium (1)
-
vanadium (3)
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-
nitrogen (4)
-
noble gases
-
argon
-
Ar-36 (1)
-
-
helium
-
He-3 (4)
-
-
neon
-
Ne-21 (1)
-
-
xenon
-
Xe-129 (1)
-
-
-
oxygen
-
O-16 (1)
-
O-17 (1)
-
O-17/O-16 (2)
-
O-18 (1)
-
O-18/O-16 (5)
-
-
short-lived isotopes (1)
-
sulfur
-
S-34/S-32 (1)
-
-
trace metals (1)
-
-
fossils
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia (1)
-
Reptilia
-
Diapsida
-
Archosauria
-
dinosaurs
-
Saurischia
-
Theropoda
-
Coelurosauria
-
Tyrannosauridae
-
Tyrannosaurus
-
Tyrannosaurus rex (1)
-
-
-
-
-
-
-
-
-
-
-
-
-
Invertebrata
-
Mollusca
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
-
-
-
Protista
-
Silicoflagellata (1)
-
-
-
microfossils (4)
-
Plantae
-
algae
-
diatoms (1)
-
nannofossils (2)
-
-
-
thallophytes (2)
-
-
geochronology methods
-
(U-Th)/He (2)
-
Ar/Ar (4)
-
exposure age (1)
-
fission-track dating (1)
-
I/Xe (1)
-
K/Ar (3)
-
optical mineralogy (1)
-
paleomagnetism (2)
-
Pb/Pb (1)
-
radiation damage (1)
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thermochronology (1)
-
U/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
upper Holocene (1)
-
-
Pleistocene
-
upper Pleistocene (1)
-
-
-
Tertiary
-
lower Tertiary (8)
-
Neogene
-
Miocene
-
Columbia River Basalt Group (1)
-
upper Miocene (1)
-
-
-
Paleogene
-
Eocene
-
upper Eocene (3)
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (9)
-
-
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
Hell Creek Formation (1)
-
K-T boundary (9)
-
Maestrichtian
-
upper Maestrichtian (1)
-
-
Senonian (3)
-
Turonian (1)
-
-
-
Jurassic
-
Lower Jurassic
-
Triassic-Jurassic boundary (1)
-
-
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
Upper Triassic
-
Triassic-Jurassic boundary (1)
-
-
-
-
Paleozoic
-
Cambrian
-
Bonanza King Formation (1)
-
Carrara Formation (1)
-
-
Devonian
-
Upper Devonian
-
Famennian (2)
-
Frasnian (2)
-
-
-
Ordovician
-
Upper Ordovician (1)
-
-
Permian
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
-
Phanerozoic (5)
-
Precambrian
-
Archean
-
Mesoarchean (1)
-
Neoarchean (1)
-
Paleoarchean (1)
-
-
Hadean (3)
-
Stillwater Complex (1)
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Gawler Range Volcanics (1)
-
-
Neoproterozoic
-
Vendian (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
gabbros (1)
-
ultramafics
-
peridotites
-
dunite (1)
-
harzburgite (1)
-
lherzolite (1)
-
-
pyroxenite
-
orthopyroxenite (1)
-
websterite (1)
-
-
-
-
volcanic rocks
-
adakites (1)
-
andesites
-
boninite (1)
-
-
basalts
-
flood basalts (2)
-
ocean-island basalts (1)
-
-
dacites (1)
-
komatiite (3)
-
-
-
ophiolite (2)
-
-
metamorphic rocks
-
metamorphic rocks
-
eclogite (1)
-
impactites
-
impact breccia (2)
-
-
metasomatic rocks
-
skarn (1)
-
-
-
ophiolite (2)
-
-
meteorites
-
meteorites
-
Allan Hills Meteorites (1)
-
Graves Nunataks Meteorites (1)
-
iron meteorites
-
octahedrite (1)
-
-
micrometeorites (7)
-
Northwest Africa Meteorites (1)
-
stony irons
-
lodranite (1)
-
mesosiderite (1)
-
pallasite (4)
-
-
stony meteorites
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acapulcoite (1)
-
achondrites
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angrite (3)
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aubrite (2)
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diogenite (5)
-
eucrite (6)
-
HED meteorites (4)
-
howardite (4)
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lunar meteorites (1)
-
Martian meteorites
-
SNC Meteorites
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shergottite (1)
-
-
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ureilite (4)
-
-
chondrites
-
carbonaceous chondrites
-
CI chondrites
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Orgueil Meteorite (1)
-
-
CM chondrites
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Murchison Meteorite (1)
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-
CO chondrites (1)
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CR chondrites (1)
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CV chondrites (3)
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Tagish Lake Meteorite (1)
-
-
enstatite chondrites (2)
-
ordinary chondrites
-
H chondrites (3)
-
L chondrites (5)
-
LL chondrites (5)
-
-
-
-
-
-
minerals
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alloys
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carbides
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moissanite (1)
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kamacite (4)
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nitrides (1)
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phosphides (2)
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silicides (1)
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taenite (3)
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arsenides (1)
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carbonates
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calcite (3)
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halides
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chlorides
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sylvite (1)
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hydrates (1)
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minerals (3)
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native elements
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diamond (1)
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organic minerals (1)
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oxides
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chrome spinel (1)
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corundum (2)
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spinel (5)
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phosphates
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apatite (2)
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silicates
-
chain silicates
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pyroxene group
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clinopyroxene
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augite (1)
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diopside (1)
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hedenbergite (1)
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orthopyroxene (2)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
orthoclase (1)
-
-
plagioclase
-
anorthite (1)
-
-
-
silica minerals
-
quartz (1)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group
-
andradite (1)
-
hydrogarnet
-
hydrogrossular (1)
-
-
-
olivine group
-
fayalite (2)
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forsterite (1)
-
olivine (10)
-
ringwoodite (1)
-
-
zircon group
-
zircon (1)
-
-
-
-
sheet silicates
-
clay minerals
-
saponite (1)
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smectite (1)
-
-
serpentine group
-
cronstedtite (1)
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serpentine (1)
-
-
-
-
sulfates (1)
-
sulfides
-
oldhamite (1)
-
troilite (2)
-
-
tellurides (1)
-
-
Primary terms
-
absolute age (8)
-
academic institutions (1)
-
Africa
-
East Africa
-
Sudan (1)
-
-
Southern Africa
-
Barberton greenstone belt (1)
-
Kaapvaal Craton (1)
-
South Africa (2)
-
-
-
Antarctica
-
Antarctic ice sheet (1)
-
Transantarctic Mountains (1)
-
-
Arctic region
-
Greenland (1)
-
-
Asia
-
Far East
-
China (1)
-
-
Popigay Structure (2)
-
Siberian Platform
-
Aldan Shield (1)
-
Anabar Shield (1)
-
-
Yakutia Russian Federation
-
Anabar Shield (1)
-
-
-
asteroids (147)
-
Atlantic Ocean
-
Equatorial Atlantic (1)
-
North Atlantic
-
Ceara Rise (1)
-
North Sea (1)
-
-
South Atlantic (1)
-
-
atmosphere (18)
-
Australasia
-
Australia
-
South Australia
-
Gawler Craton (1)
-
-
Western Australia
-
Hamersley Basin (1)
-
-
-
Papua New Guinea
-
New Britain (1)
-
-
-
biogeography (1)
-
biography (2)
-
brines (1)
-
Canada
-
Eastern Canada
-
Ontario (1)
-
-
Nunavut
-
Haughton impact structure (2)
-
-
Western Canada
-
Northwest Territories
-
Tuktoyaktuk Peninsula (1)
-
-
-
-
carbon
-
C-13/C-12 (2)
-
-
Cenozoic
-
Quaternary
-
Holocene
-
upper Holocene (1)
-
-
Pleistocene
-
upper Pleistocene (1)
-
-
-
Tertiary
-
lower Tertiary (8)
-
Neogene
-
Miocene
-
Columbia River Basalt Group (1)
-
upper Miocene (1)
-
-
-
Paleogene
-
Eocene
-
upper Eocene (3)
-
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (9)
-
-
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia (1)
-
Reptilia
-
Diapsida
-
Archosauria
-
dinosaurs
-
Saurischia
-
Theropoda
-
Coelurosauria
-
Tyrannosauridae
-
Tyrannosaurus
-
Tyrannosaurus rex (1)
-
-
-
-
-
-
-
-
-
-
-
-
-
climate change (3)
-
core (6)
-
crust (5)
-
crystal chemistry (2)
-
crystal growth (2)
-
crystal structure (1)
-
data processing (3)
-
Deep Sea Drilling Project
-
IPOD
-
Leg 73
-
DSDP Site 524 (1)
-
-
-
-
deformation (1)
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diagenesis (1)
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Earth (25)
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earthquakes (5)
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ecology (2)
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education (4)
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energy sources (2)
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Europe
-
Fennoscandian Shield (1)
-
Murmansk Russian Federation
-
Kola Peninsula (1)
-
-
Southern Europe
-
Italy
-
Apennines (1)
-
Marches Italy
-
Ancona Italy
-
Massignano Italy (1)
-
-
-
Umbria Italy
-
Perugia Italy
-
Gubbio Italy (2)
-
-
-
-
-
Ukraine
-
Boltyshka Depression (1)
-
-
Western Europe
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Belgium (1)
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France
-
Rochechouart Crater (1)
-
-
Scandinavia
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Sweden
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Dalarna Sweden
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Siljan Ring (2)
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Jamtland Sweden
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Lockne Crater (1)
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explosions (2)
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extraterrestrial geology (4)
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faults (1)
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geochemistry (17)
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hydrogen
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hydrology (1)
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igneous rocks
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plutonic rocks
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gabbros (1)
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ultramafics
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peridotites
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dunite (1)
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harzburgite (1)
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lherzolite (1)
-
-
pyroxenite
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orthopyroxenite (1)
-
websterite (1)
-
-
-
-
volcanic rocks
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adakites (1)
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andesites
-
boninite (1)
-
-
basalts
-
flood basalts (2)
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ocean-island basalts (1)
-
-
dacites (1)
-
komatiite (3)
-
-
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inclusions
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fluid inclusions (1)
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Indian Ocean
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Ninetyeast Ridge (1)
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interplanetary space (6)
-
Invertebrata
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Mollusca
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
-
-
-
Protista
-
Silicoflagellata (1)
-
-
-
isotopes
-
radioactive isotopes
-
Al-26 (3)
-
I-129 (1)
-
Mn-53 (1)
-
Re-187/Os-188 (1)
-
-
stable isotopes
-
Ar-36 (1)
-
C-13/C-12 (2)
-
Cl-37/Cl-35 (1)
-
Cr-53/Cr-52 (2)
-
D/H (3)
-
Fe-56/Fe-54 (1)
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
asteroids
Progressive change in dislocation microstructures in shocked calcite with pressure: Characterization of micrometeoroid bombardment on asteroid Ryugu Available to Purchase
A Glimpse at Some Momentous Recent Discoveries and Developments in Geosciences Available to Purchase
Identification of Hydroandradite in CM Carbonaceous Chondrites: A Product of Calc-Silicate Alteration on C-Complex Asteroids Available to Purchase
Meteorites and Planet Formation Available to Purchase
Exoplanet Mineralogy Available to Purchase
Investigation on the Impact Fracture Mechanism of Rock in Microgravity Environment Using the Continuum-Discontinuum Element Method Open Access
Extraterrestrial Organic Matter: An Introduction Available to Purchase
Asteroidal Organics from the Sample Return Mission Hayabusa2 and their Implication for Understanding our Origins Available to Purchase
Galaxy of Green Available to Purchase
3. NOBLE GAS (AND OTHER) STUDIES ON METEORITES AND OTHER SAMPLES FROM FAR AWAY Available to Purchase
Synthesis of ferrian and ferro-saponites: Implications for the structure of (Fe,Mg)-smectites formed under reduced conditions Available to Purchase
Impact-crater ages and micrometeorite paleofluxes compared: Evidence for the importance of ordinary chondrites in the flux of meteorites and asteroids to Earth over the past 500 million years Open Access
ABSTRACT Although the ~200 impact craters known on Earth represent only a small fraction of the craters originally formed, the available data suggest an excess of craters by one order of magnitude, in number, in the interval ca. 470–440 Ma during the Ordovician. Most of these “excess” craters may be related to the breakup of the L-chondrite parent body (LCPB) in the asteroid belt at 465.8 ± 0.3 Ma. This is the only obvious peak in the crater-age record that can currently be attributed to an asteroid breakup and shower event. Spatial crater densities in regions with high potential for crater preservation (e.g., Canada and Scandinavia) support a one order-of-magnitude increase in the flux of large (>0.1 km) impactors following the LCPB breakup. A similar pattern as seen in the cratering record is emerging in studies of the flux of micrometeoritic chrome spinel through the Phanerozoic, with so far only one major spike in the flux, and associated with the LCPB breakup. Similarly, the record of K-Ar and (U-Th)/He gas retention ages of recently fallen meteorites only locates one major breakup, the LCPB event, during the Phanerozoic. On the other hand, astronomical backtracking studies of the orbits of asteroid family members indicate ~70 major family-forming breakups within the past ~540 m.y., which apparently have not left any clear imprint in Earth’s geological record. The chrome-spinel grains recovered in our studies dominantly represent large micrometeorites (>300 µm) and as such are also representative of the flux of larger meteorites to Earth. An observed, nearly constant flux of ordinary chondritic chrome-spinel grains throughout the Phanerozoic, except after the LCPB event, indicates that the present situation—with a clear dominance of ordinary chondritic matter in the large (>500 µm) micrometeorite and macroscopic meteorite fractions—has prevailed at least for the last 500 m.y. This is also supported by generally high ratios in our samples of chrome-spinel grains from ordinary chondrites compared to other types of spinel-bearing meteorites. The chrome-spinel data together with the abundance of fossil meteorites (1–21 cm in diameter) on the Ordovician seafloor also sets an upper limit at one order of magnitude on the increase in flux of large (>0.1-km-diameter) L-chondritic projectiles to Earth following the LCPB. Such an increase would not stand out in the global cratering record if ordinary chondritic impactors had only represented a small fraction of all Phanerozoic impactors. We argue that the origin of impactors delivered to Earth during the past 500 m.y. has mirrored the flux of large micrometeorites and meteorites, with ordinary chondrites being an important or, most likely, the dominant (in numbers) component throughout.
This volume pays tribute to the great career and extensive and varied scientific accomplishments of Walter Alvarez, on the occasion of his 80th birthday in 2020, with a series of papers related to the many topics he covered in the past 60 years: Tectonics of microplates, structural geology, paleomagnetics, Apennine sedimentary sequences, geoarchaeology and Roman volcanics, Big History, and most famously the discovery of evidence for a large asteroidal impact event at the Cretaceous–Tertiary (now Cretaceous–Paleogene) boundary site in Gubbio, Italy, 40 years ago, which started a debate about the connection between meteorite impact and mass extinction. The manuscripts in this special volume were written by many of Walter’s close collaborators and friends, who have worked with him over the years and participated in many projects he carried out. The papers highlight specific aspects of the research and/or provide a summary of the current advances in the field.