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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Ethiopia (1)
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Kenya
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Mount Kenya (1)
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Lake Turkana (2)
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Tanzania
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Kilimanjaro (2)
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Turkana Basin (2)
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East African Lakes
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Lake Turkana (2)
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East African Rift (1)
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Antarctica
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Victoria Land
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Cape Roberts (1)
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Atlantic Ocean Islands
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Azores
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Shetland Islands (1)
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Australasia
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Australia
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Victoria Australia (2)
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New Zealand
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Otago New Zealand
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Kakanui (1)
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Europe
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Western Europe
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United Kingdom
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Mexico
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Midland Valley (1)
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United States
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Arizona
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California (1)
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New Hampshire
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Carroll County New Hampshire
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Ossipee Mountains (1)
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New Mexico
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Valencia County New Mexico (1)
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Oklahoma
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Kiowa County Oklahoma (1)
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Wichita Mountains (1)
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Southern Oklahoma Aulacogen (1)
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elements, isotopes
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carbon
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C-14 (1)
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hydrogen (2)
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isotope ratios (1)
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isotopes
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radioactive isotopes
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C-14 (1)
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Pb-207/Pb-204 (1)
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stable isotopes
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Nd-144/Nd-143 (1)
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Sr-87/Sr-86 (1)
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metals
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aluminum (1)
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lead
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Pb-207/Pb-204 (1)
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rare earths
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neodymium
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silicon (1)
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fossils
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Primates
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Hominidae (2)
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Invertebrata
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Mollusca
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microfossils (1)
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Plantae
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algae
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diatoms (1)
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geochronology methods
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Ar/Ar (6)
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K/Ar (2)
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geologic age
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Cenozoic
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Koobi Fora Formation (2)
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Quaternary
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Pleistocene
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lower Pleistocene
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upper Quaternary (1)
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Shungura Formation (2)
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Tertiary
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Paleogene
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Paleozoic
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Cambrian
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igneous rocks
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granophyre (1)
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plutonic rocks
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granites
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A-type granites (1)
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syenites (1)
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volcanic rocks
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basalts
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alkali basalts
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alkali olivine basalt (2)
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glasses (2)
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nephelinite (1)
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phonolites (4)
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pumice (3)
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trachytes (1)
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metamorphic rocks
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minerals
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minerals (10)
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oxides
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phosphates
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apatite (2)
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silicates
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framework silicates
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sanidine (7)
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nepheline group
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silica minerals
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quartz (2)
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orthosilicates
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olivine group
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olivine (1)
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ring silicates
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cordierite (1)
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Primary terms
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absolute age (7)
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Africa
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East Africa
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Ethiopia (1)
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Kenya
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Mount Kenya (1)
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Lake Turkana (2)
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Tanzania
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Kilimanjaro (2)
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Turkana Basin (2)
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East African Lakes
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Lake Turkana (2)
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East African Rift (1)
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Antarctica
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Victoria Land
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Cape Roberts (1)
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Atlantic Ocean Islands
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Azores
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Terceira Island (1)
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Shetland Islands (1)
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Australasia
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Australia
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South Australia (1)
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Victoria Australia (2)
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New Zealand
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Otago New Zealand
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Kakanui (1)
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carbon
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C-14 (1)
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Cenozoic
-
Koobi Fora Formation (2)
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Omo Group (1)
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Quaternary
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Pleistocene
-
lower Pleistocene
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Olduvai Subchron (1)
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-
Matuyama Chron (1)
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upper Quaternary (1)
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Shungura Formation (2)
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Tertiary
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Neogene
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Miocene
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lower Miocene (1)
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Pliocene (4)
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Paleogene
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Oligocene
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upper Oligocene (1)
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upper Cenozoic (1)
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chemical analysis (2)
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Chordata
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Vertebrata
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Primates
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Hominidae (2)
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crystal chemistry (5)
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crystal growth (5)
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crystal structure (7)
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deformation (1)
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Europe
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Southern Europe
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Italy
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Sicily Italy
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Lipari Islands
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Stromboli (1)
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Western Europe
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United Kingdom
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Great Britain
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Scotland
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Hebrides (1)
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Scottish Highlands
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Grampian Highlands (1)
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Shetland Islands (1)
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geochemistry (6)
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geochronology (2)
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hydrogen (2)
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igneous rocks
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granophyre (1)
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plutonic rocks
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granites
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A-type granites (1)
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syenites (1)
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volcanic rocks
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basalts
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alkali basalts
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alkali olivine basalt (2)
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glasses (2)
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nephelinite (1)
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phonolites (4)
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pyroclastics
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ignimbrite (2)
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pumice (3)
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tuff (3)
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rhyolites
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comendite (1)
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pantellerite (1)
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trachytes (1)
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inclusions
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fluid inclusions (2)
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intrusions (1)
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Invertebrata
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Mollusca
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Bivalvia (1)
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isotopes
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radioactive isotopes
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C-14 (1)
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Pb-207/Pb-204 (1)
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stable isotopes
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Nd-144/Nd-143 (1)
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Pb-207/Pb-204 (1)
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Sr-87/Sr-86 (1)
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lava (2)
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magmas (6)
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mantle (1)
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metals
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alkali metals
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potassium (1)
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sodium (1)
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alkaline earth metals
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calcium (1)
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strontium
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Sr-87/Sr-86 (1)
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aluminum (1)
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lead
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Pb-207/Pb-204 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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metamorphic rocks
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hornfels (1)
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metasedimentary rocks
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metapelite (1)
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metamorphism (1)
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Mexico
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Chihuahua Mexico (1)
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Durango Mexico (1)
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Sierra Madre Occidental (1)
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mineralogy (5)
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minerals (10)
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Paleozoic
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Cambrian
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Lower Cambrian (1)
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petrology (3)
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phase equilibria (5)
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Plantae
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algae
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diatoms (1)
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nannofossils (1)
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sedimentary rocks
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clastic rocks (1)
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sediments
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marine sediments (1)
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silicon (1)
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Southern Ocean
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Ross Sea (1)
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spectroscopy (2)
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United States
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Arizona
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Gila County Arizona (1)
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California (1)
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New Hampshire
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Carroll County New Hampshire
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Ossipee Mountains (1)
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New Mexico
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Valencia County New Mexico (1)
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Oklahoma
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Kiowa County Oklahoma (1)
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Wichita Mountains (1)
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Southern Oklahoma Aulacogen (1)
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volcanology (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks (1)
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volcaniclastics (1)
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sediments
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sediments
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marine sediments (1)
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volcaniclastics (1)
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anorthoclase
Twinning in “anorthoclase” megacrysts from phonolitic eruptions, Erebus volcano, Antarctica
Evolution of OH groups in diopside and feldspars with temperature
Timing of intense magmatic episodes in the northern and central Sierra Madre Occidental, western Mexico
Process of granophyre crystallization in the Long Mountain Granite, southern Oklahoma
New single crystal 40 Ar/ 39 Ar ages improve time scale for deposition of the Omo Group, Omo–Turkana Basin, East Africa
Ignimbrites are relatively rare on mid-oceanic volcanic islands, but they occur on at least three of the nine Azorean islands—São Miguel, Faial, and Terceira. Ignimbrites on Terceira, which are mostly comenditic trachyte in composition, constitute a significant portion of the island's volcanic stratigraphy exposed primarily in cliff sections along the southern and northern coastlines. The base of the most recent group of deposits, called the Upper Terceira Group, is marked by the Lajes-Angra Ignimbrite, an extensive ignimbrite sheet produced during the latest ignimbrite-forming episode ~20–23 k.y. ago. The Lower Terceira Group consists of ignimbrites and interstratified pyroclastic fall deposits and lava flows predating the Lajes-Angra Ignimbrite. Including the Lajes-Angra Ignimbrite, the exposed volcanic succession on Terceira includes at least seven formations containing ignimbrites plus two isolated exposures of other pyroclastic density current deposits (a spatter flow and a block-and-ash-flow–like deposit). Most of these are from Pico Alto or, possibly, Guilherme Moniz, the middle pair of central volcanoes of the four that form Terceira. Radiocarbon ages complemented by 40 Ar/ 39 Ar age determinations on anorthoclase crystals from several ignimbrites suggest a narrow period of ignimbrite-forming volcanism on Terceira dating from ca. 86 ka to ca. 20–23 ka, which followed a period of predominantly effusive basaltic to trachytic/rhyolitic activity. However, a recurrence of ignimbrite volcanism on the island cannot be completely discounted. The results from this study also indicate that the 40 Ar/ 39 Ar method can be successfully applied to date anorthoclase crystals in volcanic rocks younger than 100 ka from Terceira, although it does not provide the same precision as radiocarbon dating at the younger age range of these volcanic rocks.