The Late Neogene 87Sr/86Sr Record of Lowland Himalayan Rivers

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Science  20 Jun 1997:
Vol. 276, Issue 5320, pp. 1828-1831
DOI: 10.1126/science.276.5320.1828

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Fossil shells and paleosol carbonate from ancestral Himalayan river deposits provide a 87Sr/86Sr record of lowland Himalayan river water during the late Neogene. Reconstructed87Sr/86Sr river values increased sharply in the late Miocene, probably marking the beginning of exhumation of high-87Sr/86Sr metalimestones, more in the central than in the western Himalayas. These results imply that the marine 87Sr/86Sr record may not be a proxy for silicate weathering or consumption of atmospheric CO2resulting from that weathering.

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