(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A
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 Ferra dolerite sources...
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.191104 https://doi.org/10.1594/PANGAEA.191104 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.191104 2023-05-15T13:45:35+02:00 (Table 1) Detrital modes for sand grains in sediment core CRP-2/2A Smellie, John L LATITUDE: -77.005983 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-01T00:00:00 * DATE/TIME END: 1998-10-01T00:00:00 * MINIMUM DEPTH, sediment/rock: 8.45 m * MAXIMUM DEPTH, sediment/rock: 615.69 m 2000-03-16 text/tab-separated-values, 1408 data points https://doi.pangaea.de/10.1594/PANGAEA.191104 https://doi.org/10.1594/PANGAEA.191104 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.191104 https://doi.org/10.1594/PANGAEA.191104 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Smellie, John L (2000): Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 545-552, hdl:10013/epic.28253.d001 14.2 km at 096° true from Cape Roberts Amphibole Biotite Cape Roberts Project Core wireline system CRP CRP-2 CWS DEPTH sediment/rock Facies name/code Feldspar Grains colorless Grain size description Matrix Minerals other Muscovite off Cape Roberts Ross Sea Antarctica Opaque minerals Plagioclase Pyroxene Quartz angular polycrystalline rounded Rock fragments Sampling/drilling from ice Volcanic glass brown Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.191104 2023-01-20T07:50:14Z 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 Ferra dolerite sources, although alternating with subordinate thicknesses of strata derived from a predominantly granitoid source (Granite Harbour Intrusive Complex; GHIC). Above the 307 mbsf unconformities, 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. Dataset Antarc* Antarctica McMurdo Sound Ross Sea PANGAEA - Data Publisher for Earth & Environmental Science Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) Granite Harbour ENVELOPE(162.733,162.733,-76.883,-76.883) McMurdo Sound Ross Sea Transantarctic Mountains ENVELOPE(163.719450,163.719450,-77.005983,-77.005983) |
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 Amphibole Biotite Cape Roberts Project Core wireline system CRP CRP-2 CWS DEPTH sediment/rock Facies name/code Feldspar Grains colorless Grain size description Matrix Minerals other Muscovite off Cape Roberts Ross Sea Antarctica Opaque minerals Plagioclase Pyroxene Quartz angular polycrystalline rounded Rock fragments Sampling/drilling from ice Volcanic glass brown |
spellingShingle |
14.2 km at 096° true from Cape Roberts Amphibole Biotite Cape Roberts Project Core wireline system CRP CRP-2 CWS DEPTH sediment/rock Facies name/code Feldspar Grains colorless Grain size description Matrix Minerals other Muscovite off Cape Roberts Ross Sea Antarctica Opaque minerals Plagioclase Pyroxene Quartz angular polycrystalline rounded Rock fragments Sampling/drilling from ice Volcanic glass brown Smellie, John L (Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
topic_facet |
14.2 km at 096° true from Cape Roberts Amphibole Biotite Cape Roberts Project Core wireline system CRP CRP-2 CWS DEPTH sediment/rock Facies name/code Feldspar Grains colorless Grain size description Matrix Minerals other Muscovite off Cape Roberts Ross Sea Antarctica Opaque minerals Plagioclase Pyroxene Quartz angular polycrystalline rounded Rock fragments Sampling/drilling from ice Volcanic glass brown |
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 Ferra dolerite sources, although alternating with subordinate thicknesses of strata derived from a predominantly granitoid source (Granite Harbour Intrusive Complex; GHIC). Above the 307 mbsf unconformities, 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 |
Dataset |
author |
Smellie, John L |
author_facet |
Smellie, John L |
author_sort |
Smellie, John L |
title |
(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
title_short |
(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
title_full |
(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
title_fullStr |
(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
title_full_unstemmed |
(Table 1) Detrital modes for sand grains in sediment core CRP-2/2A |
title_sort |
(table 1) detrital modes for sand grains in sediment core crp-2/2a |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.191104 https://doi.org/10.1594/PANGAEA.191104 |
op_coverage |
LATITUDE: -77.005983 * LONGITUDE: 163.719450 * DATE/TIME START: 1998-10-01T00:00:00 * DATE/TIME END: 1998-10-01T00:00:00 * MINIMUM DEPTH, sediment/rock: 8.45 m * MAXIMUM DEPTH, sediment/rock: 615.69 m |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(162.733,162.733,-76.883,-76.883) ENVELOPE(163.719450,163.719450,-77.005983,-77.005983) |
geographic |
Cape Roberts Granite Harbour McMurdo Sound Ross Sea Transantarctic Mountains |
geographic_facet |
Cape Roberts Granite Harbour McMurdo Sound Ross Sea Transantarctic Mountains |
genre |
Antarc* Antarctica McMurdo Sound Ross Sea |
genre_facet |
Antarc* Antarctica McMurdo Sound Ross Sea |
op_source |
Supplement to: Smellie, John L (2000): Erosional history of the Transantarctic Mountains deduced from sand grain detrital modes in CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 545-552, hdl:10013/epic.28253.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.191104 https://doi.org/10.1594/PANGAEA.191104 |
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.191104 |
_version_ |
1766227767631806464 |