Geochemistry of sediments, DSDP Leg 64, Gulf of California.

Abstract

The geochemical trends of Sites 474-476 at the tip of Baja California reflect changes in the percentages of sedimentary components - particularly biogenous matter and mineralogy - that support interpretations of sedimentary environments inferred to be present since the commencement of subsidence along this young, passive continental margin. With few exceptions, geochemical trends are remarkably constant with depth, suggesting that Site 479 can serve as an 'internal' standard or average sediment against which the magnitude of hydrothermal alteration at the basinal Sites 477, 478, and 481 can be measured.-Author