PANGAEA_802673 (Appendix) Coarse-sand fraction abundance and composition at DSDP Site 86-579 and Hole 86-580 Krissek, Lawrence A; Morley, Joseph J; Lofland, Darlene K (Appendix) Coarse-sand fraction abundance and composition at DSDP Site 86-579 and Hole 86-580 1985 PANGAEA Dataset Supplement to: Krissek, Lawrence A; Morley, Joseph J; Lofland, Darlene K (1985): The occurrence, abundance, and composition of ice-rafted debris in sediments from Deep Sea Drilling Project Sites 579 and 580, Northwest Pacific. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 647-655, https://doi.org/10.2973/dsdp.proc.86.128.1985 https://doi.pangaea.de/10.1594/PANGAEA.802673 Investigator Lawrence A Krissek krissek.1@osu.edu Earth Science Event label Sample code/label DEPTH, sediment/rock AGE Size fraction 2.000-0.250 mm Ice rafted debris Volcanic components Biogenic particles geoscientificInformation 86-579 86-579A 86-580 Drilling/drill rig Leg86 DSDP/ODP/IODP sample designation Wet sieving Counting 250-2000 µm fraction Glomar Challenger 1982-06-01 1982-06-06 Complete 38.6268 41.6245 153.8362 153.9763 0.14 m (DEPTH, sediment/rock) 152.87 m (DEPTH, sediment/rock) DSDP Deep Sea Drilling Project unrestricted CC-BY-3.0: Creative Commons Attribution 3.0 Unported English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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The abundance and composition of the coarse-sand fraction (250 µm-2 mm) of samples from Deep Sea Drilling Project Sites 579 and 580 were investigated to determine the chronology of ice rafting at these locations. The ice-rafting signal at these sites is reduced relative to the generalized ice-rafting chronology of the North Pacific (Kent et al., 1971) because of increased distance to the ice-rafting source areas. These data, however, do record the general increase in ice-rafting importance as sediment age decreases, especially between 0 and 1.0 m.y. ago. In addition, peaks in ice-rafting importance since 1.0 m.y. ago at Sites 579 and 580 are generally synchronous with periods of major ice-rafting influence throughout the North Pacific. The first occurrence of ice-rafted debris at the Matuyama/Gauss magnetic boundary supports a proposed age of approximately 2.47 m.y. for the onset of major Northern Hemisphere glaciation. The coarse-sand fraction at Sites 579 and 580 contains a significant component of non-ice-rafted material, particularly biogenic particles and volcanic pumice. Under these conditions, the standard assumption that the weight percent of the coarse-sand fraction reflects variations in ice-rafting importance may not be valid. For samples taken at some distance from the source of ice-rafted debris, both the abundance and the composition of the coarse-sand fraction must be considered to obtain a valid measure of the influence of sediment transport via ice rafting. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.802673"!

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.2973/dsdp.proc.86.128.1985 The occurrence, abundance, and composition of ice-rafted debris in sediments from Deep Sea Drilling Project Sites 579 and 580, Northwest Pacific https://hdl.handle.net/10013/epic.27914.d001 DSDP/ODP/IODP sample designation https://www.deepseadrilling.org/ DSDP https://www-odp.tamu.edu:443/glomar.html Glomar Challenger DIF 9.4 2026-06-15