Middle to Late Quaternary sedimentation and rock-magnetic of ODP Site 105-646 ...

• Main Authors: Hall, Frank R, Bloemendal, Jan, King, John W, Arthur, Michael A, Aksu, Ali E
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1989
• Subjects: Composite Core; Drilling/drill rig; Leg105; Joides Resolution; Ocean Drilling Program ODP; Labrador Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.743538; https://doi.pangaea.de/10.1594/PANGAEA.743538

We examine rock-magnetic, carbonate, and planktonic foraminiferal fluxes to identify climatically controlled changes of terrigenous and pelagic sedimentation at Ocean Drilling Program (ODP) Site 646 (the Labrador Sea). Terrigenous sediments are brought to the site principally by bottom currents. We use a rock-magnetic parameter sensitive to changes in magnetic mineral grain size, the ratio of anhysteretic susceptibility to low-field magnetic susceptibility (XARM/X), to monitor changes in bottom-current intensity over time, with large values of XARM/X (finer-grained magnetic minerals) indicating weaker bottom currents. A second rock-magnetic parameter, magnetic mineral accumulation rate (KaT) was used to indicate variations in terrigenous flux. Planktonic foraminiferal and carbonate accumulation rates (Pfar and CaC03ar) are used as indicators of pelagic flux.Absolute age assignments are based on correlation between the planktonic foraminiferal oxygen-isotope variations for Site 646 and the SPECMAP master ... : Supplement to: Hall, Frank R; Bloemendal, Jan; King, John W; Arthur, Michael A; Aksu, Ali E (1989): Middle to late Quaternary sediment fluxes in the Labrador Sea. ODP LEg 105, Site 646: a synthesis of rock-magnetic, oxygen-isotopic, carbonate, and planktonic foraminiferal data. 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, 653-688 ...