Krissek, Lawrence A; Morley, Joseph J; Lofland, Darlene K (1985): (Appendix) Coarse-sand fraction abundance and composition at DSDP Site 86-579 and Hole 86-580 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.802673, Supplement to: Krissek, LA et al. (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
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Published: 1985 (exact date unknown) • DOI registered: 2012-12-25
Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 39.626433 * Median Longitude: 153.883500 * South-bound Latitude: 38.626800 * West-bound Longitude: 153.836200 * North-bound Latitude: 41.624500 * East-bound Longitude: 153.976300
Date/Time Start: 1982-06-01T00:00:00 * Date/Time End: 1982-06-06T00:00:00
Minimum DEPTH, sediment/rock: 0.14 m * Maximum DEPTH, sediment/rock: 152.87 m
Event(s):
86-579 * Latitude: 38.628000 * Longitude: 153.836200 * Date/Time: 1982-06-01T00:00:00 * Elevation: -5737.0 m * Penetration: 18.9 m * Recovery: 17.1 m * Location: North Pacific Ocean * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 17.9 m cored; 0 m drilled; 95.3 % recovery
86-579A * Latitude: 38.626800 * Longitude: 153.838000 * Date/Time: 1982-06-01T00:00:00 * Elevation: -5737.0 m * Penetration: 149.5 m * Recovery: 116.2 m * Location: North Pacific Ocean * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 135.5 m cored; 0 m drilled; 85.7 % recovery
86-580 * Latitude: 41.624500 * Longitude: 153.976300 * Date/Time: 1982-06-06T00:00:00 * Elevation: -5375.0 m * Penetration: 155.3 m * Recovery: 140.4 m * Location: North Pacific Ocean * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 155.3 m cored; 0 m drilled; 90.4 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Krissek, Lawrence A | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 4 | AGE | Age | ka BP | Geocode | ||
| 5 | Size fraction 2.000-0.250 mm | 2000-250 µm | % | Krissek, Lawrence A | Wet sieving | |
| 6 | Ice rafted debris | IRD | % | Krissek, Lawrence A | Counting 250-2000 µm fraction | |
| 7 | Volcanic components | Volcanic | % | Krissek, Lawrence A | Counting 250-2000 µm fraction | |
| 8 | Biogenic particles | Biog | % | Krissek, Lawrence A | Counting 250-2000 µm fraction |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1227 data points