Data Description

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Citation:
Jarrard, RD et al. (2001): (Table 1) Core intervals of sediment core CRP-3 that have been stitched and reorientated to North. doi:10.1594/PANGAEA.465903,
Supplement to: Jarrard, Richard D; Paulsen, Timothy S; Wilson, Terry (2001): Orientation of CRP-3 core, Victoria Land Basin, Antarctica. Terra Antartica, 8(3), 161-166, hdl:10013/epic.28211.d001
Abstract:
CRP-3 cores were not orientated with respect to North during coring operations. However, borehole televiewer (BHTV) logging did obtain azimuthally orientated images of the borehole wall, and core processing included digital imaging of the outer surface of 85% of the cores. Images of many individual core segments can be digitally joined, or stitched, by rotating them to match the shapes of their adjoining surfaces and then closing the gap. By aligning features (fractures, bedding, and clasts) on stitched-core images with correlative features on orientated BHTV images, we reorientated 231 m of core, or 25% of the cored interval. We estimate that the orientation uncertainty is ±10° for entire stitched-core intervals, and ±15° for individual features such as a single fracture or palaeomagnetic sample. Reliability of core orientations was confirmed by comparing azimuths of bedding and fractures measured directly within these reorientated cores to those measured within orientated borehole televiewer images.
Project(s):
Coverage:
Latitude: -77.006000 * Longitude: 163.719000
Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00
Minimum DEPTH, sediment/rock: 219.5 m * Maximum DEPTH, sediment/rock: 899.4 m
Event(s):
CRP-3 * * Latitude: -77.006000 * Longitude: 163.719000 * Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00 * Elevation: -295.0 m * Recovery: 936.00 m * Penetration: 939.00 m * Location: Ross Sea * * Campaign: CRP-3 * * Basis: Sampling/drilling from ice * * Device: Core wireline system * * Comment: 11.76 km at 76° true from Cape Roberts, 2.04 km at 225° true from CRP-2. Fast ice thickness: 2.0 to 2.2 m. Sea rise embedded to 9.55 mbsf. Lateral ice movement from spudding 5.0 m to 82° true. HQ core to 345.85 mbsf. NQ core to 939.42 mbsf. Core recovery 97%. Phase 1 logging to 345 mbsf, Phase 2 logging to 773 mbsf, Phase 3 logging to 918 mbsf. Deepest Cenozoic lithology and depth: sandstone breccia from 822.87 to 823.11 mbsf. Age of oldest Cenozoic strata: earliest Oligocene or latest Eocene. Deepest core lithology and depth: light red-brown quartz-cemented quartz sandstone to 939.42 mbsf. Age of bedrock: (mid?) Devonian.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rock *DepthmGeocode
2Depth, top/min *Depth topmJarrard, Richard D *
3Depth, bottom/max *Depth botmJarrard, Richard D *
4Number of observations *NOBS#Jarrard, Richard D *
5Angle *AngledegJarrard, Richard D *reorientated angle stitched image vs. N
6Standard deviation *Std devJarrard, Richard D *
7Confidence *ConfJarrard, Richard D *95% of confidence
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132 data points

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