Computer Science
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pnas...81.8032t&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 81, Issue 24, pp. 8032-8034
Computer Science
12
Scientific paper
The relationship between 187Os/186Os and 143Nd/144Nd in different manganese nodule fields is used to determine the 187Os/186Os ratio of the continental terrains bounding the major ocean basins. The Atlantic Ocean drainages yield 187Os/186Os of about 11; the Pacific Ocean, between 25 and 36; and the western Indian Ocean, 20. By assuming a two-component continental crust composed of ``ultramafic rocks'' (high Os concentration, low 187Os/186Os and ``granite'' with only radiogenic 187Os produced in accessory Re-bearing molybdenite, the ultramafic contribution to weathering is about 0.2%. Some or most of this may come from the alteration of oceanic ultramafics.
Luck Jean-Marc
Turekian Karl K.
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