Dredging up Mawson: implications for the geology of coastal East Antarctica.
During the 1911–1914 Australasian Antarctic Expedition samples of bottom sediment were dredged from a wide sweep of coastline extending from the main base at Commonwealth Bay, to the western edge of the Shackleton Ice Shelf. An earlier study showed these sediments to contain palynomorphs recycled fr...
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Online Access: | https://eprints.utas.edu.au/22524/ https://eprints.utas.edu.au/22524/7/05%20Truswell.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:22524 2023-05-15T14:04:47+02:00 Dredging up Mawson: implications for the geology of coastal East Antarctica. Truswell, EM 2012 application/pdf https://eprints.utas.edu.au/22524/ https://eprints.utas.edu.au/22524/7/05%20Truswell.pdf en eng https://eprints.utas.edu.au/22524/7/05%20Truswell.pdf Truswell, EM 2012 , 'Dredging up Mawson: implications for the geology of coastal East Antarctica.' , Papers and Proceedings of the Royal Society of Tasmania, vol. 146 , pp. 45-56 , doi:10.26749/rstpp.146.45 <http://dx.doi.org/10.26749/rstpp.146.45>. cc_utas Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia Antarctica Mawson dredging palynomorphs recycling continental shelf ice shelves Article PeerReviewed 2012 ftunivtasmania https://doi.org/10.26749/rstpp.146.45 2020-05-30T07:37:00Z During the 1911–1914 Australasian Antarctic Expedition samples of bottom sediment were dredged from a wide sweep of coastline extending from the main base at Commonwealth Bay, to the western edge of the Shackleton Ice Shelf. An earlier study showed these sediments to contain palynomorphs recycled from eroding sedimentary sequences. High concentrations of Permian, Jurassic to Early Cretaceous, and Cenozoic microfossils were present in three regions of the continental shelf, namely, offshore from the Shackleton Ice Shelf, from Cape Carr and from close to the Mertz Glacier. The findings of the earlier study are re-evaluated in the light of new information concerning the bathymetry of sampled areas on the continental shelf, the sub-ice topography of ice shelves and the Antarctic interior, and of sedimentary processes controlling the movement of palynomorphs on the sea floor. Data from the vicinity of the Shackleton Ice Shelf raise the possibility of sourcing some recycled material through sub-ice connections with the deep Aurora Subglacial Basin of the interior. From the George V Basin, west of the Mertz Glacier, new echo-sounding data show the dredges collected lie mostly on the edge of a steep trough parallel to the coast. Previous suggestions that Jurassic to Cretaceous sequences there correlate with those of the Otway Basin on the Australian margin are corroborated by recent seismic reflection data showing thick rift and pre-rift sequences offshore from the Adélie and Wilkes coasts. The relationship of these sequences to putative Mesozoic sequences within the inland Wilkes Basin is uncertain. Limited studies suggest that recycled palynomorphs in continental shelf sediments may lie close to the sites of their original deposition. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Mertz Glacier Shackleton Ice Shelf University of Tasmania: UTas ePrints Antarctic Cape Carr ENVELOPE(159.383,159.383,-80.633,-80.633) Carr ENVELOPE(130.717,130.717,-66.117,-66.117) Commonwealth Bay ENVELOPE(142.500,142.500,-67.000,-67.000) East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Shackleton Shackleton Ice Shelf ENVELOPE(100.504,100.504,-65.996,-65.996) The Antarctic Papers and Proceedings of the Royal Society of Tasmania 45 56 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia Antarctica Mawson dredging palynomorphs recycling continental shelf ice shelves |
spellingShingle |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia Antarctica Mawson dredging palynomorphs recycling continental shelf ice shelves Truswell, EM Dredging up Mawson: implications for the geology of coastal East Antarctica. |
topic_facet |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia Antarctica Mawson dredging palynomorphs recycling continental shelf ice shelves |
description |
During the 1911–1914 Australasian Antarctic Expedition samples of bottom sediment were dredged from a wide sweep of coastline extending from the main base at Commonwealth Bay, to the western edge of the Shackleton Ice Shelf. An earlier study showed these sediments to contain palynomorphs recycled from eroding sedimentary sequences. High concentrations of Permian, Jurassic to Early Cretaceous, and Cenozoic microfossils were present in three regions of the continental shelf, namely, offshore from the Shackleton Ice Shelf, from Cape Carr and from close to the Mertz Glacier. The findings of the earlier study are re-evaluated in the light of new information concerning the bathymetry of sampled areas on the continental shelf, the sub-ice topography of ice shelves and the Antarctic interior, and of sedimentary processes controlling the movement of palynomorphs on the sea floor. Data from the vicinity of the Shackleton Ice Shelf raise the possibility of sourcing some recycled material through sub-ice connections with the deep Aurora Subglacial Basin of the interior. From the George V Basin, west of the Mertz Glacier, new echo-sounding data show the dredges collected lie mostly on the edge of a steep trough parallel to the coast. Previous suggestions that Jurassic to Cretaceous sequences there correlate with those of the Otway Basin on the Australian margin are corroborated by recent seismic reflection data showing thick rift and pre-rift sequences offshore from the Adélie and Wilkes coasts. The relationship of these sequences to putative Mesozoic sequences within the inland Wilkes Basin is uncertain. Limited studies suggest that recycled palynomorphs in continental shelf sediments may lie close to the sites of their original deposition. |
format |
Article in Journal/Newspaper |
author |
Truswell, EM |
author_facet |
Truswell, EM |
author_sort |
Truswell, EM |
title |
Dredging up Mawson: implications for the geology of coastal East Antarctica. |
title_short |
Dredging up Mawson: implications for the geology of coastal East Antarctica. |
title_full |
Dredging up Mawson: implications for the geology of coastal East Antarctica. |
title_fullStr |
Dredging up Mawson: implications for the geology of coastal East Antarctica. |
title_full_unstemmed |
Dredging up Mawson: implications for the geology of coastal East Antarctica. |
title_sort |
dredging up mawson: implications for the geology of coastal east antarctica. |
publishDate |
2012 |
url |
https://eprints.utas.edu.au/22524/ https://eprints.utas.edu.au/22524/7/05%20Truswell.pdf |
long_lat |
ENVELOPE(159.383,159.383,-80.633,-80.633) ENVELOPE(130.717,130.717,-66.117,-66.117) ENVELOPE(142.500,142.500,-67.000,-67.000) ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(100.504,100.504,-65.996,-65.996) |
geographic |
Antarctic Cape Carr Carr Commonwealth Bay East Antarctica Mertz Glacier Shackleton Shackleton Ice Shelf The Antarctic |
geographic_facet |
Antarctic Cape Carr Carr Commonwealth Bay East Antarctica Mertz Glacier Shackleton Shackleton Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Mertz Glacier Shackleton Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Mertz Glacier Shackleton Ice Shelf |
op_relation |
https://eprints.utas.edu.au/22524/7/05%20Truswell.pdf Truswell, EM 2012 , 'Dredging up Mawson: implications for the geology of coastal East Antarctica.' , Papers and Proceedings of the Royal Society of Tasmania, vol. 146 , pp. 45-56 , doi:10.26749/rstpp.146.45 <http://dx.doi.org/10.26749/rstpp.146.45>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.26749/rstpp.146.45 |
container_title |
Papers and Proceedings of the Royal Society of Tasmania |
container_start_page |
45 |
op_container_end_page |
56 |
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1766276116587216896 |