Geochemistry of Neogene-Quaternary sediments in ODP Site 105-645 ...

• Main Authors: Thiébault, Francois, Cremer, Michel, Debrabant, Pierre, Foulon, J, Nielsen, Ole Bjorslev, Zimmerman, Herman
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1989
• Subjects: Drilling/drill rig; Leg19; Leg105; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Ocean Drilling Program ODP; Baffin Bay; Baffin
• Online Access: https://dx.doi.org/10.1594/pangaea.745176; https://doi.pangaea.de/10.1594/PANGAEA.745176

Subcontinuously cored early(?)-middle Miocene to recently deposited sediments from ODP Site 645 were studied texturally, mineralogically, and geochemically. The entire sequence contains minerals and associated chemical elements that are chiefly of detrital origin. In particular, the clay minerals, which include smectite, kaolinite, chlorite, and illite, are detrital. No obvious evidence of diagenesis with depth, of burial, of volcanism, or of hydrothermal alteration was observed.The sedimentary textures, clay mineralogy, and <2-µm fraction geochemistry of the early middle Miocene sediments (630 to 1147 mbsf) suggest the pronounced but variable influence of a southward bottom current. Two clay facies are defined. The lower one, Cj (780 to 1147 mbsf), is characterized by the great abundance of discrete smectite (with less than 15% illite interlayers), probably detrital in origin, and reworked older, discrete, smectite-rich sediments. The upper clay facies, C2 (630 to 780 mbsf), shows a net decrease of the ... : Supplement to: Thiébault, Francois; Cremer, Michel; Debrabant, Pierre; Foulon, J; Nielsen, Ole Bjorslev; Zimmerman, Herman (1989): Analysis of sedimentary facies, clay mineralogy, and geochemistry of the Neogene-Quaternary sediments in ODP Site 645, Baffin Bay. 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, 83-100 ...