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Fielding, Christopher R; Baker, Julian C; Woolfe, Ken; Howe, John; Lavelle, Mark (1998): Modal analyses of thin-sections of sediment core CRP-1 (Table 1). doi:10.1594/PANGAEA.438843,
Supplement to: Fielding, CR et al. (1998): Reassessment of the Miocene-Quaternary boundary in CRP-1, Cape Roberts Project, Antarctica. Terra Antartica, 5(3), 425-426, hdl:10013/epic.28334.d001

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During the course of the 1997 drilling campaign, lithostratigraphic boundaries were assigned to the CRP-l core on the basis of perceived changes in lithology. The geologically most important boundary in the core, between the Miocene and overlying Quaternary sections, was placed at 43.55 mbsf. This horizon was described in the core logs (Cape Roberts Science Team, 1998) as a contact between muddy, finegrained sandstone (which were assigned a Lower Miocene age based on diatom biostratigsaphy) and overlying diamictons containing Quaternary diatoms. This boundary is a major unconformity, recognisable on seismic reflection records. As such, it has considerable significance in the ongoing scientific analysis of the drillcore. During a re-examination of the core, focusing on the archive half held at the Antarctic Geology Research Facility of the Florida State University at Tallahassee; the authors noted that the core across the published boundary (43.55 mbsf) did not show any lithological change, but logged a sharp contact between dark olive grey, muddy sandstone and overlying diamicton at 43.15 mbsf (Fig. l). We suggest, therefore, that the core log in appendix l of Cape Roberts Science Team (1998) is misleading over this interval. In order to test the veracity of the suggested boundary revision, a series of thin-sections was examined and point-counted for framework grain abundances.
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: 38.41 m * Maximum DEPTH, sediment/rock: 43.57 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 * 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 InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2EpochEpochFielding, Christopher R
3QuartzQz%Fielding, Christopher RThin section analysis/measurements
4ChertChert%Fielding, Christopher RThin section analysis/measurements
5KalifeldsparKfs%Fielding, Christopher RThin section analysis/measurements
6PlagioclasePl%Fielding, Christopher RThin section analysis/measurements
7VolcaniteVolcanite%Fielding, Christopher RThin section analysis/measurements
8Volcanic glassVolc glass%Fielding, Christopher RThin section analysis/measurements
9PyroxenePyrox%Fielding, Christopher RThin section analysis/measurements
10CalciteCal%Fielding, Christopher RThin section analysis/measurementsdiagenetic
11MicriteMicrite%Fielding, Christopher RThin section analysis/measurementscalcareous mud
12Opaque mineralsOpaque%Fielding, Christopher RThin section analysis/measurements
13ClaystoneClaystone%Fielding, Christopher RThin section analysis/measurements
14PorosityPoros% volFielding, Christopher RThin section analysis/measurementsvisible
15Grain size, mean radiusRadiusmmFielding, Christopher RThin section analysis/measurementsestimated
16Sorting descriptionSort descrFielding, Christopher RThin section analysis/measurements
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