Mineralogy of ODP Site 105-645 ...

• Main Authors: Hiscott, Richard N, Aksu, Ali E, Nielsen, Ole Bjorslev
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1989
• Subjects: Composite Core; Leg105; Joides Resolution; Ocean Drilling Program ODP; Baffin Bay; Baffin
• Online Access: https://dx.doi.org/10.1594/pangaea.745167; https://doi.pangaea.de/10.1594/PANGAEA.745167

Cores from the upper 70 meters below seafloor (mbsf) (upper Pleistocene) at Ocean Drilling Program (ODP) Site 645 in Baffin Bay show dramatic meter-scale changes in color and mineralogy. Below this interval, mineralogical changes are more gradual to the top of the Miocene at about 550 mbsf. The Pliocene-Pleistocene section can be divided into five facies: Facies 1 - massive, poorly sorted, gravel-bearing muds; Facies 2 - gray silty clays and silty muds; Facies 3 - laminated detricarbonate silty muds; Facies 4 - silty sand and sandy silt; and Facies 5 - poorly sorted muddy sands and silty muds. Facies 4 and 5 are restricted to the Pliocene section below depths of about 275 mbsf. The mineralogical/color cycles in the upper 70 mbsf are the result of alternations between Facies 2 and three lithotypes of Facies 1: lithotype A - tan-colored, carbonate-rich, gravel-bearing mud; lithotype B - weak, red-colored, gravel-bearing mud rich in sedimentary rock fragments; and lithotype C - gray, gravel-bearing mud. A ... : Supplement to: Hiscott, Richard N; Aksu, Ali E; Nielsen, Ole Bjorslev (1989): Provenance and dispersal patterns, Pliocene-Pleistocene section at 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, 31-52 ...