Cowan, Ellen A (2001): Ice rafte debris of ODP Hole 178-1101A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.735542, Supplement to: Cowan, EA (2001): Identification of the glacial signal from the Antarctic Peninsula since 3.0 Ma at Site 1011 in a continental rise sediment drift. In: Barker, PF; Camerlenghi, A; Acton, GD; Ramsay, ATS (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 178, 1-22, https://doi.org/10.2973/odp.proc.sr.178.206.2001
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Abstract:
Sediment drifts on the continental rise west of the Antarctic Peninsula received fine-grained sediment and ice-rafted debris (IRD) directly from the continental shelf and thus indirectly record the history of West Antarctic glaciation. Site 1101 contains a 218-m-thick, nearly continuous section extending from the late Pliocene to the Holocene. To assess the presence of calving glaciers at sea level in the Antarctic Peninsula region, the mass accumulation rate (MAR) of IRD was calculated using the weight percent terrigenous sand fraction (250 µm to 2 mm). IRD MAR is cyclic throughout, with small peaks alternating with periods of low or no IRD. Many cycles have a sawtooth pattern that increases gradually to the peak then abruptly decreases to zero. This pattern is consistent with rapid disintegration of ice streams and release of icebergs from the continental shelf. Three unusually large peaks (three to five times the size of other peaks) occurred at approximately 2.8, 1.9, and 0.88 Ma and indicate periods of intense ice rafting.
Lithofacies were described in detail using X-radiographs and core descriptions for the interval from 1.34 to 0.54 Ma. Glacial units are represented by thickly laminated mud deposited by distal turbidites and meltwater plumes. Less commonly, thinly laminated sediment formed by contour currents and diamicton by intense ice rafting. Interglacials are represented by foraminifer-bearing mud with IRD. Ice rafting appears to have increased in the later part of the glacial period and remained high in the interglacial period.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -64.372200 * Longitude: -70.261180
Date/Time Start: 1998-03-18T10:30:00 * Date/Time End: 1998-03-18T10:30:00
Event(s):
178-1101A * Latitude: -64.372200 * Longitude: -70.261180 * Date/Time: 1998-03-18T10:30:00 * Elevation: -3279.7 m * Penetration: 217.7 m * Recovery: 215.75 m * Location: South Pacific Ocean * Campaign: Leg178 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 217.7 m cored; 0 m drilled; 99.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Cowan, EA (2001): (Table T1) Summary of depth ranges sampled, sample spacing, linear sedimentation rates and resultant temporal spacing interval, Hole 178-1101A. https://doi.org/10.1594/PANGAEA.132794
- Cowan, EA (2001): (Appendix) Data used to calculate mass accumulation rates of coarse-sand ice-rafted debris of ODP Hole 178-1101A. https://doi.org/10.1594/PANGAEA.133054