Geochemistry of sediments on the Rio Grande Rise and the redox evolution of the South Atlantic Ocean

Details Geochemistry of sediments on the Rio Grande Rise and the redox evolution of the South Atlantic Ocean Geochemistry of sediments on the Rio Grande Rise and the redox evolution of the South Atlantic Ocean

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..201h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 1, pp.201-207

Computer Science

3

Scientific paper

Sediment samples (32) from DSDP Holes 516 and 516F, Leg 72 were subjected to INAA (instrumental neutron activation analysis). Thirty-two major, minor and trace elements were determined. Ce anomalies, Ce A Ce ( obs .)/ Ce * (interpolated between La and Nd and relative to the N.A.S.C. (North American Shale Composite)) = Ce ( obs .)/[1.44 La ( obs .) + 0.66 Nd ( obs .)], in the carbonate phase were obtained. Calculations indicate that the Ce anomaly changed from 0.80 (80 My), 0.68 (67 My) to 0.30 (56 My), 0.27 (39 My) and 0.12-0.43 (avg. 0.26) (15-0.3 My). The Ce A change observed at ~55 My coincides with the Ce A change at ~58 My in marine carbonates from the Walvis Ridge, Hole 525A. These changes are attributed to improved water circulation caused by either the widening of the north-south Atlantic passage, subsidence of the Rio Grande Rise or subsidence of the Romanche Fracture Zone. The ultimate driving force behind the Ce A changes is related to the pH and P O 2 of the seawater and also related to global circulation of bottom ocean water and transport of the external terrestrial input from riverine or/and aeolian sources.

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