- 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
-
Southern Africa
-
Botswana (1)
-
Karoo Basin (1)
-
South Africa (1)
-
-
-
Asia
-
Altai Mountains (1)
-
Arabian Peninsula
-
Arabian Shield (1)
-
Oman (1)
-
Yemen (1)
-
-
Central Asia (1)
-
Far East
-
China
-
Xinjiang China
-
Junggar (1)
-
-
Yangtze Platform (1)
-
Yangtze River (1)
-
Yunnan China (1)
-
-
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Bundelkhand (1)
-
Ghats
-
Western Ghats (1)
-
-
Narmada-Son Lineament (1)
-
-
-
Tibetan Plateau (2)
-
Tien Shan (1)
-
-
Australasia
-
Australia
-
Victoria Australia (1)
-
Western Australia (2)
-
-
-
Broken Ridge (1)
-
Caledonides (1)
-
Chicxulub Crater (2)
-
Europe
-
Western Europe
-
Scandinavia
-
Sweden
-
Dalarna Sweden
-
Siljan (1)
-
-
-
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
Indian Ocean
-
East Indian Ocean (1)
-
-
Kerguelen Plateau (1)
-
Mexico
-
Chiapas Mexico (1)
-
Yucatan Mexico (1)
-
-
South America
-
Brazil (1)
-
Parana Basin (1)
-
-
Southern Ocean (1)
-
-
commodities
-
metal ores
-
copper ores (2)
-
gold ores (2)
-
molybdenum ores (1)
-
-
mineral deposits, genesis (2)
-
mineral exploration (1)
-
petroleum (1)
-
-
elements, isotopes
-
isotope ratios (5)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (2)
-
-
stable isotopes
-
Ar-40/Ar-39 (2)
-
Hf-177/Hf-176 (1)
-
O-18/O-16 (1)
-
S-34/S-32 (1)
-
-
-
metals
-
alkaline earth metals
-
strontium (1)
-
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
lead (1)
-
rare earths
-
neodymium (1)
-
-
-
noble gases
-
argon
-
Ar-40/Ar-39 (2)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
sulfur
-
S-34/S-32 (1)
-
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (17)
-
Re/Os (1)
-
thermochronology (2)
-
U/Pb (9)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Pleistocene (2)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
upper Eocene (1)
-
-
Oligocene (1)
-
Paleocene
-
lower Paleocene
-
K-T boundary (3)
-
-
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
K-T boundary (3)
-
-
-
Jurassic (1)
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
-
-
Paleozoic
-
Cambrian
-
Semri Series (1)
-
-
Devonian
-
Upper Devonian (1)
-
-
lower Paleozoic (1)
-
Ordovician
-
Upper Ordovician (1)
-
-
Permian
-
Passa Dois Group (1)
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
upper Paleozoic (2)
-
-
Precambrian
-
Archean
-
Neoarchean (1)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (1)
-
Neoproterozoic
-
Moine Supergroup (1)
-
-
Paleoproterozoic (1)
-
-
-
-
Vindhyan (1)
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
granites
-
leucogranite (1)
-
-
pegmatite (2)
-
quartz monzonite (1)
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (3)
-
ocean-island basalts (1)
-
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses (1)
-
impactites
-
impact breccia (1)
-
-
metaigneous rocks (2)
-
metasedimentary rocks (3)
-
mylonites (1)
-
-
-
meteorites
-
meteorites
-
stony meteorites
-
chondrites
-
ordinary chondrites
-
L chondrites (1)
-
-
-
-
-
-
minerals
-
phosphates
-
monazite (2)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (2)
-
-
-
-
framework silicates
-
feldspar group
-
plagioclase (3)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (6)
-
-
-
-
ring silicates
-
tourmaline group
-
schorl (1)
-
-
-
sheet silicates
-
illite (1)
-
mica group
-
biotite (2)
-
muscovite (2)
-
-
-
-
-
Primary terms
-
absolute age (17)
-
Africa
-
Southern Africa
-
Botswana (1)
-
Karoo Basin (1)
-
South Africa (1)
-
-
-
Asia
-
Altai Mountains (1)
-
Arabian Peninsula
-
Arabian Shield (1)
-
Oman (1)
-
Yemen (1)
-
-
Central Asia (1)
-
Far East
-
China
-
Xinjiang China
-
Junggar (1)
-
-
Yangtze Platform (1)
-
Yangtze River (1)
-
Yunnan China (1)
-
-
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Bundelkhand (1)
-
Ghats
-
Western Ghats (1)
-
-
Narmada-Son Lineament (1)
-
-
-
Tibetan Plateau (2)
-
Tien Shan (1)
-
-
asteroids (1)
-
Australasia
-
Australia
-
Victoria Australia (1)
-
Western Australia (2)
-
-
-
Cenozoic
-
Quaternary
-
Pleistocene (2)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
upper Eocene (1)
-
-
Oligocene (1)
-
Paleocene
-
lower Paleocene
-
K-T boundary (3)
-
-
-
-
-
-
chemical analysis (1)
-
crust (2)
-
deformation (1)
-
diagenesis (1)
-
Europe
-
Western Europe
-
Scandinavia
-
Sweden
-
Dalarna Sweden
-
Siljan (1)
-
-
-
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
faults (2)
-
geochemistry (3)
-
geochronology (2)
-
geomorphology (1)
-
igneous rocks
-
plutonic rocks
-
granites
-
leucogranite (1)
-
-
pegmatite (2)
-
quartz monzonite (1)
-
-
volcanic rocks
-
basalts
-
alkali basalts (1)
-
flood basalts (3)
-
ocean-island basalts (1)
-
-
-
-
Indian Ocean
-
East Indian Ocean (1)
-
-
intrusions (3)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (2)
-
-
stable isotopes
-
Ar-40/Ar-39 (2)
-
Hf-177/Hf-176 (1)
-
O-18/O-16 (1)
-
S-34/S-32 (1)
-
-
-
lava (1)
-
magmas (1)
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
K-T boundary (3)
-
-
-
Jurassic (1)
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (1)
-
-
-
-
metal ores
-
copper ores (2)
-
gold ores (2)
-
molybdenum ores (1)
-
-
metals
-
alkaline earth metals
-
strontium (1)
-
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
lead (1)
-
rare earths
-
neodymium (1)
-
-
-
metamorphic rocks
-
gneisses (1)
-
impactites
-
impact breccia (1)
-
-
metaigneous rocks (2)
-
metasedimentary rocks (3)
-
mylonites (1)
-
-
metamorphism (4)
-
metasomatism (2)
-
meteorites
-
stony meteorites
-
chondrites
-
ordinary chondrites
-
L chondrites (1)
-
-
-
-
-
Mexico
-
Chiapas Mexico (1)
-
Yucatan Mexico (1)
-
-
mineral deposits, genesis (2)
-
mineral exploration (1)
-
noble gases
-
argon
-
Ar-40/Ar-39 (2)
-
-
-
ocean basins (1)
-
Ocean Drilling Program
-
Leg 119
-
ODP Site 738 (1)
-
-
Leg 120
-
ODP Site 747 (1)
-
ODP Site 748 (1)
-
ODP Site 749 (1)
-
ODP Site 750 (1)
-
-
Leg 183
-
ODP Site 1136 (1)
-
ODP Site 1137 (1)
-
ODP Site 1138 (1)
-
ODP Site 1141 (1)
-
ODP Site 1142 (1)
-
-
-
ocean floors (2)
-
orogeny (1)
-
oxygen
-
O-18/O-16 (1)
-
-
paleoecology (2)
-
paleogeography (2)
-
Paleozoic
-
Cambrian
-
Semri Series (1)
-
-
Devonian
-
Upper Devonian (1)
-
-
lower Paleozoic (1)
-
Ordovician
-
Upper Ordovician (1)
-
-
Permian
-
Passa Dois Group (1)
-
Upper Permian
-
Permian-Triassic boundary (1)
-
-
-
upper Paleozoic (2)
-
-
paragenesis (1)
-
petroleum (1)
-
petrology (1)
-
phase equilibria (1)
-
planetology (1)
-
plate tectonics (6)
-
Precambrian
-
Archean
-
Neoarchean (1)
-
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (1)
-
Neoproterozoic
-
Moine Supergroup (1)
-
-
Paleoproterozoic (1)
-
-
-
-
sea-floor spreading (1)
-
sedimentary rocks (4)
-
sedimentary structures
-
seismites (1)
-
soft sediment deformation
-
clastic dikes (1)
-
-
-
sediments (1)
-
South America
-
Brazil (1)
-
Parana Basin (1)
-
-
Southern Ocean (1)
-
spectroscopy (1)
-
sulfur
-
S-34/S-32 (1)
-
-
tectonics (6)
-
-
rock formations
-
Deccan Traps (1)
-
-
sedimentary rocks
-
sedimentary rocks (4)
-
volcaniclastics (1)
-
-
sedimentary structures
-
sedimentary structures
-
seismites (1)
-
soft sediment deformation
-
clastic dikes (1)
-
-
-
-
sediments
-
sediments (1)
-
volcaniclastics (1)
-
Longest continuously erupting large igneous province driven by plume-ridge interaction
Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
Formation of the First Bend in the late Eocene gave birth to the modern Yangtze River, China
Interpreting and reporting 40 Ar/ 39 Ar geochronologic data
Tectonic evolution of the Chinese Tianshan Orogen from subduction to arc-continent collision: Insight from polyphase deformation along the Gangou section, Central Asia
Early human occupation of southeastern Australia: New insights from 40 Ar/ 39 Ar dating of young volcanoes
End-Permian impactogenic earthquake and tsunami deposits in the intracratonic Paraná Basin of Brazil
Geology and Genesis of the Cerro la Mina Porphyry-High Sulfidation Au (Cu-Mo) Prospect, Mexico
Late Paleozoic closure of the Ob-Zaisan Ocean along the Irtysh shear zone (NW China): Implications for arc amalgamation and oroclinal bending in the Central Asian orogenic belt
Origin and tectonic evolution of the NE basement of Oman: a window into the Neoproterozoic accretionary growth of India?
Cooling and exhumation along the curved Albany-Fraser orogen, Western Australia
40 Ar/ 39 Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary
Age and geochemistry of magmatism on the oceanic Wallaby Plateau and implications for the opening of the Indian Ocean
Neoproterozoic to early Paleozoic extensional and compressional history of East Laurentian margin sequences: The Moine Supergroup, Scottish Caledonides
Abstract The 40 Ar/ 39 Ar technique is the most commonly used technique to date basaltic rocks. For basaltic rocks older than about 30 Ma, the dating of plagioclase separates is preferred over groundmass as the latter is susceptible to containing cryptic alteration due to fluid circulations, difficult if not impossible to remove during sample preparation. Alteration under such metamorphic conditions progressively forms K-rich sericite after plagioclase. Owing to its transparency, plagioclase allows a distinction to be made optically between partially–completely altered grains and fresh grains. However, practice shows that grains that contain less than about 1% of sericite are hard to identify under the stereomicroscope. Owing to the high K 2 O content ( c. 10 wt%) of sericite, such compromised grains can have dramatic effects on the age determination of plagioclase. Here, we investigate and quantify the effect of sericite on the 40 Ar/ 39 Ar age determination of plagioclase using a numerical model with multiple variable parameters. We show that the most influential parameter is the time difference between the crystallization of plagioclase and the sericitization event. We also show that for some continental flood basalts, even 0.1 wt% of sericite can bias the apparent age of a plagioclase separate by several hundred thousand years. The presence of sericite can be identified using a combination of Ca/K ratios, age spectra, and 39 Ar and 37 Ar degassing curves obtained during a conventional 40 Ar/ 39 Ar step-heating procedure. When the age of the fresh plagioclase and its Ca/K ratio are known, the percentage of sericitization and the age of the alteration event can be estimated. Ultimately, above approximately 65% of sericitization, the apparent age measured on the altered plagioclase is within ±1% of the age of the alteration event, with implications for accurately dating low-temperature metamorphism and mineral deposit formations. Supplementary material: Further details of calculation are available at http://www.geolsoc.org.uk/SUP18609 .