Occurrence of Inoceramus in the South Atlantic and oxygen isotopic paleotemperatures in Hole 530A.

Abstract

Inoceramus occurs in every DSDP hole that penetrated Cretaceous sediments in the South Atlantic Ocean, and specimen occurrence has been mapped in detail for each core. Oxygen and carbon isotope measurements were completed in 18 Inoceramus specimens from Hole 530A. Textural evidence of diagenesis is accompanied by depletion in 18O. Paleotemperature results were obtained from 11 well-preserved specimens. Bottom water temperatures in the Angola Basin decreased from 23oC during the Coniacian to 13oC near the end of the Campanian.-Authors