Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica
Dynamic provenance variations are deduced from sand-grain detrital modes in samples obtained from the CRP-2/2A drillcore. Below an important unconformity at 307 metres below sea floor (mbsf), sand grains in most of the sequence were dominantly derived from Beacon sandstone and Ferrar dolerite source...
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Museo Nazionale dell'Antartide
2000
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ftnerc:oai:nora.nerc.ac.uk:502403 2023-05-15T13:48:07+02:00 Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica Smellie, J.L. 2000 http://nora.nerc.ac.uk/id/eprint/502403/ http://www.mna.it/english/Publications/TAP/TA_pdfs/Volume_07/04_CRP_2_Scientific_Results_part_2/TA_07_545_Smellie.pdf unknown Museo Nazionale dell'Antartide Smellie, J.L. 2000 Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antarctica, 7 (4). 545-552. Publication - Article PeerReviewed 2000 ftnerc 2023-02-04T19:37:17Z Dynamic provenance variations are deduced from sand-grain detrital modes in samples obtained from the CRP-2/2A drillcore. Below an important unconformity at 307 metres below sea floor (mbsf), sand grains in most of the sequence were dominantly derived from Beacon sandstone and Ferrar dolerite sources, although alternating with subordinate thicknesses of strata derived from a predominantly granitoid source (Granite Harbour Intrusive Complex; GHIC). Above the 307 mbsf unconformity, the reverse situation occurs, with most sediments dominantly sourced in the GHIC. Contributions from other sources (e.g. Jurassic Kirkpatrick basalt lavas and Proterozoic metamorphic basement) are also persistent but minor. An input of fresh volcanic detritus commenced at 307 mbsf and is ubiquitous in all the younger sediments. At least three (probably four) episodes of volcanism are identified, each lasting 1-2 M.yr in duration. The initial influx at 307 mbsf corresponds to the initiation of the McMurdo Volcanic Group (MVG) at c. 25 Ma and is much younger than estimates made previously by other workers for the oldest MVG volcanic activity in the McMurdo Sound region (Eocene?). Simultaneous major changes in the proportion of clast lithologies in CRP-2/2A suggest that the 307 mbsf unconformity is the most important petrological break within the cored sequence. It is speculated that the petrological contrasts across the unconformity are genetically associated with important climatic changes and/or rapid uplift episode(s) in the Transantarctic Mountains. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Victoria Land Natural Environment Research Council: NERC Open Research Archive Victoria Land McMurdo Sound Transantarctic Mountains Granite Harbour ENVELOPE(162.733,162.733,-76.883,-76.883) |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Dynamic provenance variations are deduced from sand-grain detrital modes in samples obtained from the CRP-2/2A drillcore. Below an important unconformity at 307 metres below sea floor (mbsf), sand grains in most of the sequence were dominantly derived from Beacon sandstone and Ferrar dolerite sources, although alternating with subordinate thicknesses of strata derived from a predominantly granitoid source (Granite Harbour Intrusive Complex; GHIC). Above the 307 mbsf unconformity, the reverse situation occurs, with most sediments dominantly sourced in the GHIC. Contributions from other sources (e.g. Jurassic Kirkpatrick basalt lavas and Proterozoic metamorphic basement) are also persistent but minor. An input of fresh volcanic detritus commenced at 307 mbsf and is ubiquitous in all the younger sediments. At least three (probably four) episodes of volcanism are identified, each lasting 1-2 M.yr in duration. The initial influx at 307 mbsf corresponds to the initiation of the McMurdo Volcanic Group (MVG) at c. 25 Ma and is much younger than estimates made previously by other workers for the oldest MVG volcanic activity in the McMurdo Sound region (Eocene?). Simultaneous major changes in the proportion of clast lithologies in CRP-2/2A suggest that the 307 mbsf unconformity is the most important petrological break within the cored sequence. It is speculated that the petrological contrasts across the unconformity are genetically associated with important climatic changes and/or rapid uplift episode(s) in the Transantarctic Mountains. |
format |
Article in Journal/Newspaper |
author |
Smellie, J.L. |
spellingShingle |
Smellie, J.L. Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
author_facet |
Smellie, J.L. |
author_sort |
Smellie, J.L. |
title |
Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
title_short |
Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
title_full |
Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
title_fullStr |
Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
title_full_unstemmed |
Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica |
title_sort |
erosional history of the transantarctic mountains deduced from sand grain detrital modes in crp-2/2a, victoria land basin, antarctica |
publisher |
Museo Nazionale dell'Antartide |
publishDate |
2000 |
url |
http://nora.nerc.ac.uk/id/eprint/502403/ http://www.mna.it/english/Publications/TAP/TA_pdfs/Volume_07/04_CRP_2_Scientific_Results_part_2/TA_07_545_Smellie.pdf |
long_lat |
ENVELOPE(162.733,162.733,-76.883,-76.883) |
geographic |
Victoria Land McMurdo Sound Transantarctic Mountains Granite Harbour |
geographic_facet |
Victoria Land McMurdo Sound Transantarctic Mountains Granite Harbour |
genre |
Antarc* Antarctica McMurdo Sound Victoria Land |
genre_facet |
Antarc* Antarctica McMurdo Sound Victoria Land |
op_relation |
Smellie, J.L. 2000 Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antarctica, 7 (4). 545-552. |
_version_ |
1766248656242999296 |