Mathematics – Logic
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109...11r&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 109, no. 1-2, March 1992, p. 11-23.
Mathematics
Logic
93
Geochronology, Himalayas, Sea Water, Strontium Isotopes, Tectonics, Basalt, Continental Drift, Ocean Bottom
Scientific paper
A new high-resolution seawater Sr isotopic evolution curve for the last 100 my is used in conjunction with modern riverine Sr flux measurements, and also geologic, tectonic, and geochronological data to argue a close relationship between seawater Sr isotopic composition and the India-Asia continental collision. A simple seawater Sr budget model is employed to show that the Sr flux associated with alteration of seafloor basalts is too small and does not have the right time evolution to account for much of the seawater Sr isotopic curve of the last 100 my. The flux of dissolved Sr carried by rivers originating in the Himalaya-Tibet region is presently a significant fraction of the global Sr Budget. It is calculated how this riverine flux would have had to change with time in order to match the observed seawater Sr isotopic curve; it is found that the riverine flux remains relatively constant prior to the collision of India with Asia but then increases very significantly after the collision.
Depaolo Donald J.
Richter Frank M.
Rowley David B.
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