Jarrard, Richard D; Brink, Jason; Bücker, Christian J; Wonik, Thomas; Wilson, Terry; Paulsen, Timothy S (2000): Average dip directions from intervals of dipmeter log in drill hole CRP-2A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.143836, Supplement to: Jarrard, RD et al. (2000): Bedding dips in CRP-2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 261-270, hdl:10013/epic.28277.d001
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Bedding dips in the CRP-2A drillhole were determined in two ways (1) analysis of a dipmeter log, and (2) identification of bed boundaries on digital images of the outer core surface. The two methods document the downhole increase in structural dip, to a maximum of 15° in the lowest 150 m of the hole. Dipmeter data, which are azimuthally oriented, indicate a 75° azimuth for structural tilting, in agreement with seismic reflection profiles. Core and log dips indicate that structural dip increases by 5-7° between 325 and 480 mbsf. Both, however, also exhibit high dip inhomogeneity because of depositional (e.g., cross bedding) and post-depositional (e.g., softsediment deformation) processes. This variability adds ambiguity to the search for angular unconformities within the CRP-2A drillhole. Dip directions of different lithologies are generally similar, as are dip directions for the four kinds of systems tracts. Downdip azimuths of sands and muds are slightly different from those of diamicts, possibly reflecting the divergence between ENE offshore dip and ESE glacial advance.
Project(s):
Cape Roberts Project (CRP)
Coverage:
Latitude: -77.005980 * Longitude: 163.719450
Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00
Minimum Elevation: -177.9 m * Maximum Elevation: -177.9 m
Event(s):
CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-2 * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Depth, top/min | Depth top | m | Jarrard, Richard D | ||
2 | Depth, bottom/max | Depth bot | m | Jarrard, Richard D | ||
3 | Sample code/label | Sample label | Jarrard, Richard D | Interval ID | ||
4 | Azimuth | Azim | deg | Jarrard, Richard D | Compass | Downdip azimuth |
5 | Bed dip | Dip | deg | Jarrard, Richard D | Compass | |
6 | Obliquity/tilt | OBL | deg | Jarrard, Richard D | Compass | Eastward tilt |
7 | Number | No | Jarrard, Richard D | Number of points | ||
8 | Confidence | Conf | Jarrard, Richard D | Student_s t | 95% confidence limits |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
238 data points