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To elucidate the main aspects of clay mineral genesis in Leg 71 sediments from the Southwest Atlantic, clay components were studied by X-ray diffraction and geochemical analysis, in the context of lithological and geological dataFour mineral complexes were distinguished. 1) A Late Jurassic to early-middle Albian complex (Site 511) represented mostly by dioctahedral smectite and hydromica admixed with kaolinite, chlorite, and quartz, that may testify to a warm, possibly humid climate in the source area. 2) An early-middle Albian to middle Maestrichtian complex of mixed-layer disordered phases of smectite-mica with an admixture of hydromica (Site 511) that does not permit evaluation of climate in the source area. 3) A late Eocene to early Oligocene complex with dioctahedral smectite admixed with hydromica and traces of chlorite, quartz, and feldspar that suggests a warm, humid climate in the source area. 4) A late Oligocene to Pleistocene mixed-layer disordered phase of smectite-mica (Sites 512-514) that testifies to the climatic deterioration in this area since the end of the Oligocene. Postsedimentary changes and the role of erosional hiatuses are also examined.

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Clay Components of Post-Middle Jurassic Sediments of the Southwest Atlantic, Deep Sea Drilling Project, Leg 71: Depositional History and Authigenic Transformations