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Howe, John; Woolfe, Ken; Fielding, Christopher R (1998): Sample information and classification of lower Miocene gravity-flow types of sediment core CRP-1 (Table 1). PANGAEA,, Supplement to: Howe, J et al. (1998): Lower Miocene glacimarine gravity flows, Cape Roberts drillhole-1, Ross Sea, Antarctica. Terra Antartica, 5(3), 393-399, hdl:10013/epic.28328.d001

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Nineteen samples of the Cape Roberts-1 drillcore were taken from Miocene- age deposits, from 90.25 – 146.50 metres below seafloor (mbsf) for thin section and laser grain-size analysis. Using the grain-size distribution, detailed core logging, X-radiography and thin-section analysis of microstructures, coupled with a statistical grouping of the grain-size data, three main styles of gravity-flow sedimentation were revealed. Thin (centimetre-scale) muddy debris-flow deposits are the most common and are possibly tirggered by debris rain-out from sea-ice These deposits are characterised by very poorly sorted, faintly laminated muddy sandstones with coarse granules toward their base. Contacts are gradational to sharp. Variations on this style of mass-wasting deposit are rhythmically stacked sequences of pebbly-coarse sandstones representing successive thin debris-flow events. These suggest very high sedimentation rates on an unstable slope in a shallow-water proximal glacimarine environment. Sandy-silty turbidites appear more common in the lower sections of the core, below approximately 141.00 mbsf, although they occur occasionally with the debris flow deposits The turbidites are characterised by inversely to normally graded, well-laminated siltstones with occasional lonestones, and represent a more distal shallow-water glacimarine environment.
Latitude: -77.007580 * Longitude: 163.755080
Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00
Minimum DEPTH, sediment/rock: 90.260 m * Maximum DEPTH, sediment/rock: 146.495 m
CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-1 * Basis: Sampling/drilling ice * Method/Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Depth, top/minDepth topmHowe, John
3Depth, bottom/maxDepth botmHowe, John
4Lithologic unit/sequenceUnitHowe, John
5Lithology/composition/faciesLithologyHowe, John
6CommentCommentHowe, John
7InterpretationInterpretationHowe, John
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