Computer Science
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.128..591p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 128, no. 3-4, p. 591-599
Computer Science
24
Chemical Composition, Hydrogen Peroxide, Osmium Isotopes, Radioactive Decay, Sea Water, Sediment Transport, Shales, Acidity, Mass Spectroscopy, Peridotite, Reservoirs
Scientific paper
The Os-187/Os-186 ratios of acidic hydrogen peroxide leaches of river sediments are inferred to be representative of the isotopic composition of Os delivered to sea water from the continents. The Os-187/Os-186 values for river sediment leaches from the eastern and central U.S., the Ganges River, and the Rio Maipo range from 10.1 to 21.5. These results suggest that the Os-187/Os-186 of the soluble river load delivered from the major continental areas to the oceans is, on average, more radiogenic than average currently eroding continental crust (10.5). Sediment leaches from three rivers from the western U.S. that drain ophiolitic peridotites have distinctly lower Os-187/Os-186 values, 1.4-7.1; such rivers may be significant contributors to sea water of the relatively unradiogenic osmium required to yield the contemporary oceanic Os-187/Os-186 of 8.6.
Esser Brad K.
Krishnaswami S.
Pegram William J.
Turekian Karl K.
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