Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results
The Wilkes Land continental rise is characterised by mounds and channels with approximately a north-south elongation, perpendicular to the margin. Proximal mound relief is up to 1000 m, decreasing to about 300 m in the central part. During the geophysical and geological survey conducted on in Februa...
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ftunivtasecite:oai:ecite.utas.edu.au:27913 2023-05-15T18:18:54+02:00 Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results Busetti, M Carburlotto, A Armand, LK Damiani, C Giorgetti, G Lucchi, RG Quilty, PG Villa, G 2003 https://doi.org/10.1016/S0967-0645(03)00078-X http://ecite.utas.edu.au/27913 en eng Pergamon http://dx.doi.org/10.1016/S0967-0645(03)00078-X Busetti, M and Carburlotto, A and Armand, LK and Damiani, C and Giorgetti, G and Lucchi, RG and Quilty, PG and Villa, G, Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 50, (8-9) pp. 1529-1562. ISSN 0967-0645 (2003) [Refereed Article] http://ecite.utas.edu.au/27913 Earth Sciences Geology Sedimentology Refereed Article PeerReviewed 2003 ftunivtasecite https://doi.org/10.1016/S0967-0645(03)00078-X 2019-12-13T21:08:29Z The Wilkes Land continental rise is characterised by mounds and channels with approximately a north-south elongation, perpendicular to the margin. Proximal mound relief is up to 1000 m, decreasing to about 300 m in the central part. During the geophysical and geological survey conducted on in February-March 2000 by the joint Italian and Australian WEGA Project, onboard R/V Tangaroa, 11 piston cores were collected along two transects crossing the channel-mound system. All cores were logged for physical (magnetic susceptibility and density) and acoustic properties (P-wave velocity). Split cores were X-rayed and samples were analysed for clay mineral assemblages, chemical and micropaleontological (diatoms, foraminifera and nannofossils) content. Glacial and interglacial intervals have been recognised in the sediment cores. The interglacial facies consists of massive mud, distinguished by: (a) bioturbated massive mud occasionally with fine-grained ice-rafted debris (IRD), and (b) structureless massive mud with abundant fine to coarse-grained IRD, containing well-preserved open-ocean diatoms. The glacial facies is represented by laminated mud with planar and/or cross laminations, with occasional isolated dropstones, and rare, poorly preserved, sea-ice diatoms. The sharp boundary, characterizing the limit between massive to laminated facies, is interpreted to indicate a fast glacial onset. In contrast, the smooth passage presents from laminated to massive sediments, indicates a gradual glacial waning. Recent down-slope gravity flows have been identified in a turbidite, a normally graded coarse-grained sand, recovered in the thalweg of Jussie Canyon, and probably also in the massive debris facies from the steep side of Mound A. The massive debris is characterised by structureless and unsorted gravel and pebbles within a muddy matrix. Clay mineral assemblages and grain lithologies indicate a hinterland Wilkes Basin and continental shelf provenance for the terrigenous fraction. Crown Copyright 2003 Published by Elsevier Science Ltd. All rights reserved. Article in Journal/Newspaper Sea ice Wilkes Land eCite UTAS (University of Tasmania) Wega ENVELOPE(144.000,144.000,-65.250,-65.250) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Deep Sea Research Part II: Topical Studies in Oceanography 50 8-9 1529 1562 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Sedimentology |
spellingShingle |
Earth Sciences Geology Sedimentology Busetti, M Carburlotto, A Armand, LK Damiani, C Giorgetti, G Lucchi, RG Quilty, PG Villa, G Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
topic_facet |
Earth Sciences Geology Sedimentology |
description |
The Wilkes Land continental rise is characterised by mounds and channels with approximately a north-south elongation, perpendicular to the margin. Proximal mound relief is up to 1000 m, decreasing to about 300 m in the central part. During the geophysical and geological survey conducted on in February-March 2000 by the joint Italian and Australian WEGA Project, onboard R/V Tangaroa, 11 piston cores were collected along two transects crossing the channel-mound system. All cores were logged for physical (magnetic susceptibility and density) and acoustic properties (P-wave velocity). Split cores were X-rayed and samples were analysed for clay mineral assemblages, chemical and micropaleontological (diatoms, foraminifera and nannofossils) content. Glacial and interglacial intervals have been recognised in the sediment cores. The interglacial facies consists of massive mud, distinguished by: (a) bioturbated massive mud occasionally with fine-grained ice-rafted debris (IRD), and (b) structureless massive mud with abundant fine to coarse-grained IRD, containing well-preserved open-ocean diatoms. The glacial facies is represented by laminated mud with planar and/or cross laminations, with occasional isolated dropstones, and rare, poorly preserved, sea-ice diatoms. The sharp boundary, characterizing the limit between massive to laminated facies, is interpreted to indicate a fast glacial onset. In contrast, the smooth passage presents from laminated to massive sediments, indicates a gradual glacial waning. Recent down-slope gravity flows have been identified in a turbidite, a normally graded coarse-grained sand, recovered in the thalweg of Jussie Canyon, and probably also in the massive debris facies from the steep side of Mound A. The massive debris is characterised by structureless and unsorted gravel and pebbles within a muddy matrix. Clay mineral assemblages and grain lithologies indicate a hinterland Wilkes Basin and continental shelf provenance for the terrigenous fraction. Crown Copyright 2003 Published by Elsevier Science Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Busetti, M Carburlotto, A Armand, LK Damiani, C Giorgetti, G Lucchi, RG Quilty, PG Villa, G |
author_facet |
Busetti, M Carburlotto, A Armand, LK Damiani, C Giorgetti, G Lucchi, RG Quilty, PG Villa, G |
author_sort |
Busetti, M |
title |
Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
title_short |
Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
title_full |
Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
title_fullStr |
Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
title_full_unstemmed |
Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results |
title_sort |
plio-quaternary sedimentation on the wilkes land continental rise: preliminary results |
publisher |
Pergamon |
publishDate |
2003 |
url |
https://doi.org/10.1016/S0967-0645(03)00078-X http://ecite.utas.edu.au/27913 |
long_lat |
ENVELOPE(144.000,144.000,-65.250,-65.250) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Wega Wilkes Land |
geographic_facet |
Wega Wilkes Land |
genre |
Sea ice Wilkes Land |
genre_facet |
Sea ice Wilkes Land |
op_relation |
http://dx.doi.org/10.1016/S0967-0645(03)00078-X Busetti, M and Carburlotto, A and Armand, LK and Damiani, C and Giorgetti, G and Lucchi, RG and Quilty, PG and Villa, G, Plio-Quaternary sedimentation on the Wilkes land continental rise: preliminary results, Deep-Sea Research. Part 2: Topical Studies in Oceanography, 50, (8-9) pp. 1529-1562. ISSN 0967-0645 (2003) [Refereed Article] http://ecite.utas.edu.au/27913 |
op_doi |
https://doi.org/10.1016/S0967-0645(03)00078-X |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
50 |
container_issue |
8-9 |
container_start_page |
1529 |
op_container_end_page |
1562 |
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1766195653802721280 |