Sedimentary facies, clay mineralogy and geochemistry of the Paleogene sediments of ODP Site 105-647 ...

• Published in: Ciencias Marinas
• Main Authors: Nielsen, Ole Bjorslev, Cremer, Michel, Stein, Ruediger, Thiébault, Francois, Zimmerman, Herman
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1989
• Subjects: Composite Core; Leg105; Joides Resolution; Ocean Drilling Program ODP; Zimmerman; Labrador Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.745194; https://doi.pangaea.de/10.1594/PANGAEA.745194

Claystones immediately overlying the early Eocene age ocean-floor basalt, cored at Ocean Drilling Program (ODP) Site 647, underwent hydrothermal and thermal alterations originating from the basalt, which resulted in changes in both the mineralogical and chemical composition of the sediments. Chlorites and higher magnesium and iron concentrations were found in the lowermost sediment sequence. Upcore, changes in the bulk chemical composition of the sediments become smaller, when compensated for variations in the carbonate content originating from biogenic and authigenic components. Chlorite disappears upcore, but still only part of the swelling clay minerals have survived the thermal influence. Thirty meters above the basalt, the clay mineralogy and chemical composition become uniform throughout the Paleogene section. Iron-rich smectites (i.e., nontronitic types), totally dominate the clay mineral assemblage. Biogenic components, responsible for the dominant part of the calcite and cristobalite contents, vary ... : Supplement to: Nielsen, Ole Bjorslev; Cremer, Michel; Stein, Ruediger; Thiébault, Francois; Zimmerman, Herman (1989): Analysis of sedimentary facies, clay mineralogy, and geochemistry of the Paleogene sediments of Site 647, Labrador Sea. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 101-110 ...