Moerz, Tobias and Wolf-Welling, Thomas C. W. (2002): Fine-fraction grain-size distribution data and their statistical treatment and relation to processes, Site 1095 (ODP Leg 178, western Antarctic Peninsula)

Leg/Site/Hole:
ODP 178
ODP 178 1095
Identifier:
2003-022419
georefid

10.2973/odp.proc.sr.178.234.2001
doi

Creator:
Moerz, Tobias
GEOMAR Research Center for Marine Geoscience, Kiel, Federal Republic of Germany
author

Wolf-Welling, Thomas C. W.
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Italy
author

Identification:
Fine-fraction grain-size distribution data and their statistical treatment and relation to processes, Site 1095 (ODP Leg 178, western Antarctic Peninsula)
2002
In: Baker, Peter F. (editor), Camerlenghi, Angelo (editor), Acton, Gary D. (editor), Brachfeld, Stefanie A., Cowan, Ellen A., Daniels, James, Domack, Eugene W., Escutia, Carlota, Evans, Andrew J., Eyles, Nicholas, Guyodo, Yohan J. B., Hatfield, Kate L., Iorio, Marina, Iwai, Masao, Kyte, Frank T., Lauer, Christine, Maldonado, Andres, Moerz, Tobias, Osterman, Lisa E., Pudsey, Carol J., Schuffert, Jeffrey D., Sjunneskog, Charlotte M., Weinheimer, Amy L., Williams, Trevor, Winter, Diane M., Wolf-Welling, Thomas C. W., Ramsay, Anthony T. S. (editor), Proceedings of the Ocean Drilling Program, scientific results, Antarctic glacial history and sea-level change; covering Leg 178 of the cruises of the drilling vessel JOIDES Resolution; Punta Arenas, Chile, to Cape Town, South Africa; sites 1095-1103; 5 February-9 April 1998
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
178
Fine-fraction (<63 mu m) grain-size analyses of 530 samples from Holes 1095A, 1095B, and 1095D allow assessment of the downhole grain-size distribution at Drift 7. A variety of data processing methods, statistical treatment, and display techniques were used to describe this data set. The downhole fine-fraction grain-size distribution documents significant variations in the average grain-size composition and its cyclic pattern, revealed in five prominent intervals: (1) between 0 and 40 meters composite depth (mcd) (0 and 1.3 Ma), (2) between 40 and 80 mcd (1.3 and 2.4 Ma), (3) between 80 and 220 mcd (2.4 and 6 Ma), (4) between 220 and 360 mcd, and (5) below 360 mcd (prior to 8.1 Ma). In an approach designed to characterize depositional processes at Drift 7, we used statistical parameters determined by the method of moments for the sortable silt fraction to distinguish groups in the grain-size data set. We found three distinct grain-size populations and used these for a tentative environmental interpretation. Population 1 is related to a process in which glacially eroded shelf material was redeposited by turbidites with an ice-rafted debris influence. Population 2 is composed of interglacial turbidites. Population 3 is connected to depositional sequence tops linked to bioturbated sections that, in turn, are influenced by contourite currents and pelagic background sedimentation.
Coverage:Geographic coordinates:
North:-66.5907
West:-78.2916East: -78.2916
South:-66.5907

Stratigraphy; Antarctic Ocean; Antarctic Peninsula; Antarctica; biogenic structures; bioturbation; Cenozoic; cores; depositional environment; erosion; glacial erosion; grain size; ice rafting; Leg 178; marine sediments; Miocene; Neogene; Ocean Drilling Program; ocean floors; ODP Site 1095; paleoclimatology; paleoenvironment; Quaternary; reconstruction; sediment transport; sedimentary structures; sediments; size distribution; statistical analysis; Tertiary; turbidite; upper Miocene;

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