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NARROW
Format
Article Type
Journal
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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Indian Peninsula
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Pakistan (1)
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Indus River (1)
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Canada
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Indian Ocean
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South America
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elements, isotopes
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metamorphic rocks
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Primary terms
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Asia
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Indian Peninsula
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Pakistan (1)
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Indus River (1)
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Canada
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Nunavut
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Ellesmere Island (1)
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Queen Elizabeth Islands
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Ellesmere Island (1)
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carbon
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C-13/C-12 (1)
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C-14 (1)
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organic carbon (1)
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Cenozoic
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Tertiary
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isotopes
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radioactive isotopes
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stable isotopes
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oxygen (1)
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Pacific Ocean
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East Pacific
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Southeast Pacific (1)
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South Pacific
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paleoclimatology (1)
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sedimentary rocks
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sediments
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sedimentary rocks
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sediments
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sediments
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marine sediments (2)
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turbidite (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Geochemical indications for the Paleocene-Eocene Thermal Maximum (PETM) and Eocene Thermal Maximum 2 (ETM-2) hyperthermals in terrestrial sediments of the Canadian Arctic Open Access
Shelfal sediment transport by an undercurrent forces turbidity-current activity during high sea level along the Chile continental margin Available to Purchase
Impact of Indus River discharge on productivity and preservation of organic carbon in the Arabian Sea over the twentieth century Available to Purchase
Monsoon control over erosion patterns in the Western Himalaya: possible feed-back into the tectonic evolution Available to Purchase
Abstract The Indus Delta is constructed of sediment eroded from the western Himalaya and since 20 ka has been subjected to strong variations in monsoon intensity. Provenance changes rapidly at 12–8 ka, although bulk and heavy mineral content remains relatively unchanged. Bulk sediment analyses shows more negative ɛ Nd and higher 87 Sr/ 86 Sr values, peaking around 8–9 ka. Apatite fission track ages and biotite Ar–Ar ages show younger grains ages at 8–9 ka compared to at the Last Glacial Maximum (LGM). At the same time δ 13 C climbs from –23 to –20‰, suggestive of a shift from terrestrial to more marine organic carbon as Early Holocene sea level rose. U–Pb zircon ages suggest enhanced erosion of the Lesser Himalaya and a relative reduction in erosion from the Transhimalaya and Karakoram since the LGM. The shift in erosion to the south correlates with those regions now affected by the heaviest summer monsoon rains. The focused erosion along the southern edge of Tibet required by current tectonic models for the Greater Himalaya would be impossible to achieve without a strong summer monsoon. Our work supports the idea that although long-term monsoon strengthening is caused by uplift of the Tibetan Plateau, monsoon-driven erosion controls Himalayan tectonic evolution. Supplementary material: A table of the population breakdown for zircons in sands and the predicted Nd isotope composition of sediments based on the zircons compared to the measured whole rock value is available at http://www.geolsoc.org.uk/SUP18412