Average dip directions from intervals of dipmeter log in drill hole CRP-2A
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...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.143836 2024-05-19T07:32:35+00:00 Average dip directions from intervals of dipmeter log in drill hole CRP-2A Jarrard, Richard D Brink, Jason Bücker, Christian J Wonik, Thomas Wilson, Terry Paulsen, Timothy S 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 2000 text/tab-separated-values, 238 data points https://doi.pangaea.de/10.1594/PANGAEA.143836 https://doi.org/10.1594/PANGAEA.143836 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.143836 https://doi.org/10.1594/PANGAEA.143836 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Jarrard, Richard D; Brink, Jason; Bücker, Christian J; Wonik, Thomas; Wilson, Terry; Paulsen, Timothy S (2000): Bedding dips in CRP-2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 261-270, hdl:10013/epic.28277.d001 14.2 km at 096° true from Cape Roberts Azimuth Bed dip Cape Roberts Project Compass Confidence Core wireline system CRP CRP-2 CRP-2A CWS Depth bottom/max top/min Number Obliquity/tilt off Cape Roberts Ross Sea Antarctica Sample code/label Sampling/drilling from ice Student_s t Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.143836 2024-04-30T23:34:34Z 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. Dataset Antarc* Antarctica Ross Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(163.719450,163.719450,-77.005980,-77.005980) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
14.2 km at 096° true from Cape Roberts Azimuth Bed dip Cape Roberts Project Compass Confidence Core wireline system CRP CRP-2 CRP-2A CWS Depth bottom/max top/min Number Obliquity/tilt off Cape Roberts Ross Sea Antarctica Sample code/label Sampling/drilling from ice Student_s t |
spellingShingle |
14.2 km at 096° true from Cape Roberts Azimuth Bed dip Cape Roberts Project Compass Confidence Core wireline system CRP CRP-2 CRP-2A CWS Depth bottom/max top/min Number Obliquity/tilt off Cape Roberts Ross Sea Antarctica Sample code/label Sampling/drilling from ice Student_s t Jarrard, Richard D Brink, Jason Bücker, Christian J Wonik, Thomas Wilson, Terry Paulsen, Timothy S Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
topic_facet |
14.2 km at 096° true from Cape Roberts Azimuth Bed dip Cape Roberts Project Compass Confidence Core wireline system CRP CRP-2 CRP-2A CWS Depth bottom/max top/min Number Obliquity/tilt off Cape Roberts Ross Sea Antarctica Sample code/label Sampling/drilling from ice Student_s t |
description |
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. |
format |
Dataset |
author |
Jarrard, Richard D Brink, Jason Bücker, Christian J Wonik, Thomas Wilson, Terry Paulsen, Timothy S |
author_facet |
Jarrard, Richard D Brink, Jason Bücker, Christian J Wonik, Thomas Wilson, Terry Paulsen, Timothy S |
author_sort |
Jarrard, Richard D |
title |
Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
title_short |
Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
title_full |
Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
title_fullStr |
Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
title_full_unstemmed |
Average dip directions from intervals of dipmeter log in drill hole CRP-2A |
title_sort |
average dip directions from intervals of dipmeter log in drill hole crp-2a |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.143836 https://doi.org/10.1594/PANGAEA.143836 |
op_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 |
long_lat |
ENVELOPE(163.719450,163.719450,-77.005980,-77.005980) |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_source |
Supplement to: Jarrard, Richard D; Brink, Jason; Bücker, Christian J; Wonik, Thomas; Wilson, Terry; Paulsen, Timothy S (2000): Bedding dips in CRP-2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 261-270, hdl:10013/epic.28277.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.143836 https://doi.org/10.1594/PANGAEA.143836 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.143836 |
_version_ |
1799470694618103808 |