Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region
Late Jurassic anaerobic-dysaerobic mudstones crop out on both the Weddell Sea (back-arc) and Pacific (fore-are) margins of the northern Antarctic Peninsula. The only known occurrence on the Pacific margin of the Antarctic Peninsula is the Anchorage Formation of Livingston Island. This mudstone domin...
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Geological Society of London
1995
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ftnerc:oai:nora.nerc.ac.uk:515773 2023-05-15T13:49:33+02:00 Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region Pirrie, D. Crame, J.A. 1995 http://nora.nerc.ac.uk/id/eprint/515773/ https://doi.org/10.1144/gsjgs.152.3.0469 unknown Geological Society of London Pirrie, D.; Crame, J.A. orcid:0000-0002-5027-9965 . 1995 Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region. Journal of the Geological Society, 152 (3). 469-480. https://doi.org/10.1144/gsjgs.152.3.0469 <https://doi.org/10.1144/gsjgs.152.3.0469> Publication - Article PeerReviewed 1995 ftnerc https://doi.org/10.1144/gsjgs.152.3.0469 2023-02-04T19:44:13Z Late Jurassic anaerobic-dysaerobic mudstones crop out on both the Weddell Sea (back-arc) and Pacific (fore-are) margins of the northern Antarctic Peninsula. The only known occurrence on the Pacific margin of the Antarctic Peninsula is the Anchorage Formation of Livingston Island. This mudstone dominated unit comprises interbedded volcaniclastic sandstones, pyroclastic/epiclastic tuffs and radiolarian mudstones. The volcaniclastic sandstones are interpreted as representing deposition from turbidity currents. The tuffs represent sedimentation by both primary airfall processes and resedimentation by low concentration turbidity currents. The radiolarian mudstones represent suspension sedimentation, and reveal an upward increase in bioturbation with a transition from anaerobic-dysaerobic conditions to dysaerobic-aerobic conditions. These facies and the observed vertical change in oxygenation conditions are similar to those seen in the Nordenskjöld Formation on the Weddell Sea margin of the Antarctic Peninsula. However, biostratigraphical investigations show that the transition from dysaerobic to aerobic conditions occurred during the late Kimmeridgian-early Tithonian in the Anchorage Formation but late Tithonian or early Berriasian in the Nordenskjold Formation. This diachroneity is related to the palaeogeographical development of the Antarctic Peninsula magmatic arc. A wide epicontinental sea and subdued arc relief in the early Kimmeridgian was followed in the Tithonian by arc uplift, increasing oxygenation in the fore-are basin, and the development of a restricted basin in the hack-arc region. In latest Tithonian-earliest Berriasian times a substantial arc had developed which supplied volcaniclastic sediment to the fore-arc basin; only then was the back-arc basin undergoing the transition from dysaerobic to aerobic conditions. Anaerobic conditions initiated by regional upwelling and expansion of the oxygen minimum zone were perpetuated in a silled basin in the back-arc area, formed by the emergent arc. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Livingston Island Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Weddell Sea Anchorage Pacific Weddell Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Nordenskjöld ENVELOPE(-60.583,-60.583,-64.667,-64.667) Journal of the Geological Society 152 3 469 480 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Late Jurassic anaerobic-dysaerobic mudstones crop out on both the Weddell Sea (back-arc) and Pacific (fore-are) margins of the northern Antarctic Peninsula. The only known occurrence on the Pacific margin of the Antarctic Peninsula is the Anchorage Formation of Livingston Island. This mudstone dominated unit comprises interbedded volcaniclastic sandstones, pyroclastic/epiclastic tuffs and radiolarian mudstones. The volcaniclastic sandstones are interpreted as representing deposition from turbidity currents. The tuffs represent sedimentation by both primary airfall processes and resedimentation by low concentration turbidity currents. The radiolarian mudstones represent suspension sedimentation, and reveal an upward increase in bioturbation with a transition from anaerobic-dysaerobic conditions to dysaerobic-aerobic conditions. These facies and the observed vertical change in oxygenation conditions are similar to those seen in the Nordenskjöld Formation on the Weddell Sea margin of the Antarctic Peninsula. However, biostratigraphical investigations show that the transition from dysaerobic to aerobic conditions occurred during the late Kimmeridgian-early Tithonian in the Anchorage Formation but late Tithonian or early Berriasian in the Nordenskjold Formation. This diachroneity is related to the palaeogeographical development of the Antarctic Peninsula magmatic arc. A wide epicontinental sea and subdued arc relief in the early Kimmeridgian was followed in the Tithonian by arc uplift, increasing oxygenation in the fore-are basin, and the development of a restricted basin in the hack-arc region. In latest Tithonian-earliest Berriasian times a substantial arc had developed which supplied volcaniclastic sediment to the fore-arc basin; only then was the back-arc basin undergoing the transition from dysaerobic to aerobic conditions. Anaerobic conditions initiated by regional upwelling and expansion of the oxygen minimum zone were perpetuated in a silled basin in the back-arc area, formed by the emergent arc. |
format |
Article in Journal/Newspaper |
author |
Pirrie, D. Crame, J.A. |
spellingShingle |
Pirrie, D. Crame, J.A. Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
author_facet |
Pirrie, D. Crame, J.A. |
author_sort |
Pirrie, D. |
title |
Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
title_short |
Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
title_full |
Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
title_fullStr |
Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
title_full_unstemmed |
Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region |
title_sort |
late jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern antarctic peninsula region |
publisher |
Geological Society of London |
publishDate |
1995 |
url |
http://nora.nerc.ac.uk/id/eprint/515773/ https://doi.org/10.1144/gsjgs.152.3.0469 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.583,-60.583,-64.667,-64.667) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Anchorage Pacific Weddell Livingston Island Nordenskjöld |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea Anchorage Pacific Weddell Livingston Island Nordenskjöld |
genre |
Antarc* Antarctic Antarctic Peninsula Livingston Island Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Livingston Island Weddell Sea |
op_relation |
Pirrie, D.; Crame, J.A. orcid:0000-0002-5027-9965 . 1995 Late Jurassic palaeogeography and anaerobic-dysaerobic sedimentation in the northern Antarctic Peninsula region. Journal of the Geological Society, 152 (3). 469-480. https://doi.org/10.1144/gsjgs.152.3.0469 <https://doi.org/10.1144/gsjgs.152.3.0469> |
op_doi |
https://doi.org/10.1144/gsjgs.152.3.0469 |
container_title |
Journal of the Geological Society |
container_volume |
152 |
container_issue |
3 |
container_start_page |
469 |
op_container_end_page |
480 |
_version_ |
1766251625405480960 |