10.1594/PANGAEA.510764
Atkins, Cliff
Cliff
Atkins
Facies distribution in CRP sediment cores from the Ross Sea, Antarctica
PANGAEA
2001
Core wireline system
CRP-2
CRP-3
Sampling/drilling from ice
Cape Roberts Project (CRP)
1998-10-01T00:00:00/1999-11-19T00:00:00
en
Supplementary Publication Series of Datasets
10013/epic.28202.d001
2 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Clasts from the Cape Roberts Project cores CRP-2/2A and CRP-3 provide indications of glacially influenced depositional environments in Oligocene and Miocene strata in the western Victoria Land Basin, Antarctica. CRP-2/2A is interpreted to represent strongly glacially influenced, unconformity bound depositional sequences produced by repeated advance and retreat of floating and grounded ice across the shelf. A similar interpretation is extended to the upper 330 meters of the CRP-3 core, but the lower part of the core records shallow marine deposition with significantly less glacial influence. Clast shape analysis from selected coarse-grained facies throughout the cored interval indicates that most clasts are glacially sourced, with little distinction between diamictite and conglomeratic facies. Three dimensional clast fabric analysis from units immediately above sequence boundaries generally display weak or random fabrics and do not suggest that grounded ice actually reached the drillsite at these intervals. Striated and outsized clasts present in fine-grained lithofacies throughout the cores provide further evidence of sub-glacially transported sediment and iceberg rafting. The distribution of these striated and out-sized clasts indicate that a significant glacial influence persisted through most of the time represented by the cores with glaciers actively calving at sea-level introducing ice-berg rafted glacial debris even in the earliest Oligocene.
Supplement to: Atkins, Cliff (2001): Glacial influence from clast features in Oligocene and Miocene stata cored in CRP-2/2A and CRP-3, Victoria Land Basin, Antarctica. Terra Antartica, 8(3), 263-274
163.719
163.71945
-77.006
-77.00598166666666
off Cape Roberts, Ross Sea, Antarctica
Ross Sea