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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Antarctica
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Antarctic ice sheet
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East Antarctic ice sheet (1)
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Antarctic Peninsula (1)
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East Antarctica (1)
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Lake Vostok (1)
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Queen Maud Land (1)
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South Shetland Islands (1)
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Wilkes Land
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Dome C (1)
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Atlantic Ocean Islands
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South Sandwich Islands (1)
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Circum-Antarctic region (2)
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Drake Passage (1)
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Scotia Sea Islands
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South Sandwich Islands (1)
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South Shetland Islands (1)
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Taylor Dome (1)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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Os-188/Os-187 (1)
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metals
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platinum group
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osmium
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Os-188/Os-187 (1)
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geochronology methods
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Re/Os (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene (1)
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Pleistocene (1)
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upper Quaternary (1)
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Paleozoic
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lower Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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ultramafics
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peridotites
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dunite (1)
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volcanic rocks
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pyroclastics (1)
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Primary terms
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absolute age (1)
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Antarctica
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Antarctic ice sheet
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East Antarctic ice sheet (1)
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Antarctic Peninsula (1)
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East Antarctica (1)
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Lake Vostok (1)
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Queen Maud Land (1)
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South Shetland Islands (1)
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Wilkes Land
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Dome C (1)
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Atlantic Ocean Islands
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South Sandwich Islands (1)
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Cenozoic
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Quaternary
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Holocene (1)
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Pleistocene (1)
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upper Quaternary (1)
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crust (1)
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igneous rocks
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plutonic rocks
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ultramafics
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peridotites
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dunite (1)
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volcanic rocks
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pyroclastics (1)
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isotopes
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stable isotopes
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Os-188/Os-187 (1)
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mantle (1)
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metals
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platinum group
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osmium
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Os-188/Os-187 (1)
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metasomatism (1)
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paleoclimatology (1)
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Paleozoic
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lower Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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Circum-Antarctic region
Highly refractory dunite formation at Gibbs Island and Bruce Bank, and its role in the evolution of the circum-Antarctic continent
Chapter 6.2 Englacial tephras of East Antarctica
Abstract Driven by successful achievements in recovering high-resolution ice records of climate and atmospheric composition through the Late Quaternary, new ice–tephra sequences from various sites of the East Antarctic Ice Sheet (EAIS) have been studied in the last two decades spanning an age range of a few centuries to 800 kyr. The tephrostratigraphic framework for the inner EAIS, based on ash occurrence in three multi-kilometre-deep ice cores, shows that the South Sandwich Islands represent a major source for tephra, highlighting the major role in the ash dispersal played by clockwise circum-Antarctic atmospheric circulation penetrating the Antarctic continent. Tephra records from the eastern periphery of the EAIS, however, are obviously influenced by explosive activity sourced in nearby Antarctic rift provinces. These tephra inventories have provided a fundamental complement to the near-vent volcanic record, in terms of both frequency/chronology of explosive volcanism and of magma chemical evolution through time. Despite recent progress, current data are still sparse. There is a need for further tephra studies to collect data from unexplored EAIS sectors, along with extending the tephra inventory back in time. Ongoing international palaeoclimatic initiatives of ice-core drilling could represent a significant motivation for the tephra community and for Quaternary Antarctic volcanologists.