Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica
The site for CRP-2, 14 km east of Cape Roberts (77.006°S; 163.719°E), was selected to overlap the early Miocene strata cored in nearby CRP-1, and to sample deeper into the east-dipping strata near the western margin ofe he Victoria Land Basin to investigate Palaeogene climatic and tectonic history....
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2006
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.525770 https://doi.org/10.1594/PANGAEA.525770 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.525770 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.525770 2023-05-15T13:42:09+02:00 Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica Woolfe, Ken Fielding, Christopher R CRP Science Team LATITUDE: -77.005981 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-01T00:00:00 * DATE/TIME END: 1998-11-25T14:20:00 2006-09-28 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.525770 https://doi.org/10.1594/PANGAEA.525770 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.525770 https://doi.org/10.1594/PANGAEA.525770 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Fielding, Christopher R; Thomson, M R A (1999): Studies from the Cape Roberts Project, Ross Sea Antarctica, Initial Report on CRP-2/2A. Terra Antartica, 6(1/2), 173 pp, hdl:10013/epic.28290.d001 14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice Dataset 2006 ftpangaea https://doi.org/10.1594/PANGAEA.525770 2023-01-20T07:30:59Z The site for CRP-2, 14 km east of Cape Roberts (77.006°S; 163.719°E), was selected to overlap the early Miocene strata cored in nearby CRP-1, and to sample deeper into the east-dipping strata near the western margin ofe he Victoria Land Basin to investigate Palaeogene climatic and tectonic history. CRP-2 was cored from 5 to 57 mbsf (metres below the sea floor) (core recovery 91 %), with a deviation resulting in CRP-2A being cored at the same site. CRP-2A reached down to 624mbsf (recovery 95%), and to strata with an age of c. 33-35 Ma. Drilling took place from 16 October to 25 November 1998, on 2.0-2.2 m of sea ice and through 178 m of water. Core fractures and other physical properties, such as sonic velocity, density and magnetic susceptibility, were measured throughout the core. Down-hole logs for these and other properties were run from 63 to 167 mbsf and subsequently from 200 to 623 mbsf, although density and velocity data could be obtained only to 440 mbsf because of hole collapse. Sonic velocity averages c. 2.0 km S-1 for the upper part of the hole, but there is an sharp increase to c. 3.0 km s-1 and also a slight angular unconformity, at 306 mbsf, corresponding most likely to the early/late Oligocene boundary (c. 28-30 Ma). Velocity then increases irregularly to around 3.6 km s-1 at the bottom of the hole, which is estimated to lie 120 m above the V4/V5 boundary. The higher velocities below 306 mbsf probably reflect more extensive carbonate and common pyrite cementation, in patches, nodules, bedding-parallel masses and as vein infills. Dip of the strata also increases down-hole from 3° in the upper 300 in to over 10° at the bottom. Temperature gradient is 21° k-1. Over 2 000 fractures were logged through the hole. Borehole televiewer imagery was obtained for the interval from 200 to 440 mbsf to orient the fractures for stress field analysis. Lithostratigraphical descriptions on a scale of 1:20 are presented for the full length of the core, along with core box images, as a 200 page supplement to this ... Dataset Antarc* Antarctica Ross Sea Sea ice Victoria Land PANGAEA - Data Publisher for Earth & Environmental Science Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) Roberts Cape ENVELOPE(163.200,163.200,-77.033,-77.033) Ross Sea Victoria Land ENVELOPE(163.719450,163.719450,-77.005981,-77.005981) |
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 Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice |
spellingShingle |
14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice Woolfe, Ken Fielding, Christopher R CRP Science Team Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
topic_facet |
14.2 km at 096° true from Cape Roberts Cape Roberts Project Core wireline system CRP CRP-2 CRP-2A CWS off Cape Roberts Ross Sea Antarctica Sampling/drilling from ice |
description |
The site for CRP-2, 14 km east of Cape Roberts (77.006°S; 163.719°E), was selected to overlap the early Miocene strata cored in nearby CRP-1, and to sample deeper into the east-dipping strata near the western margin ofe he Victoria Land Basin to investigate Palaeogene climatic and tectonic history. CRP-2 was cored from 5 to 57 mbsf (metres below the sea floor) (core recovery 91 %), with a deviation resulting in CRP-2A being cored at the same site. CRP-2A reached down to 624mbsf (recovery 95%), and to strata with an age of c. 33-35 Ma. Drilling took place from 16 October to 25 November 1998, on 2.0-2.2 m of sea ice and through 178 m of water. Core fractures and other physical properties, such as sonic velocity, density and magnetic susceptibility, were measured throughout the core. Down-hole logs for these and other properties were run from 63 to 167 mbsf and subsequently from 200 to 623 mbsf, although density and velocity data could be obtained only to 440 mbsf because of hole collapse. Sonic velocity averages c. 2.0 km S-1 for the upper part of the hole, but there is an sharp increase to c. 3.0 km s-1 and also a slight angular unconformity, at 306 mbsf, corresponding most likely to the early/late Oligocene boundary (c. 28-30 Ma). Velocity then increases irregularly to around 3.6 km s-1 at the bottom of the hole, which is estimated to lie 120 m above the V4/V5 boundary. The higher velocities below 306 mbsf probably reflect more extensive carbonate and common pyrite cementation, in patches, nodules, bedding-parallel masses and as vein infills. Dip of the strata also increases down-hole from 3° in the upper 300 in to over 10° at the bottom. Temperature gradient is 21° k-1. Over 2 000 fractures were logged through the hole. Borehole televiewer imagery was obtained for the interval from 200 to 440 mbsf to orient the fractures for stress field analysis. Lithostratigraphical descriptions on a scale of 1:20 are presented for the full length of the core, along with core box images, as a 200 page supplement to this ... |
format |
Dataset |
author |
Woolfe, Ken Fielding, Christopher R CRP Science Team |
author_facet |
Woolfe, Ken Fielding, Christopher R CRP Science Team |
author_sort |
Woolfe, Ken |
title |
Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
title_short |
Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
title_full |
Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
title_fullStr |
Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
title_full_unstemmed |
Preliminary results and documentation of sediment cores CRP2 and CRP-2A from the Ross Sea off Cape Roberts, Antarctica |
title_sort |
preliminary results and documentation of sediment cores crp2 and crp-2a from the ross sea off cape roberts, antarctica |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.525770 https://doi.org/10.1594/PANGAEA.525770 |
op_coverage |
LATITUDE: -77.005981 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-01T00:00:00 * DATE/TIME END: 1998-11-25T14:20:00 |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(163.200,163.200,-77.033,-77.033) ENVELOPE(163.719450,163.719450,-77.005981,-77.005981) |
geographic |
Cape Roberts Roberts Cape Ross Sea Victoria Land |
geographic_facet |
Cape Roberts Roberts Cape Ross Sea Victoria Land |
genre |
Antarc* Antarctica Ross Sea Sea ice Victoria Land |
genre_facet |
Antarc* Antarctica Ross Sea Sea ice Victoria Land |
op_source |
Supplement to: Fielding, Christopher R; Thomson, M R A (1999): Studies from the Cape Roberts Project, Ross Sea Antarctica, Initial Report on CRP-2/2A. Terra Antartica, 6(1/2), 173 pp, hdl:10013/epic.28290.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.525770 https://doi.org/10.1594/PANGAEA.525770 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.525770 |
_version_ |
1766163174157975552 |