Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica
ABSTRACT Sedimentary rocks of late Mesozoic age exposed at Camp Hill, northern Antarctic Peninsula, are associated with calc‐alkaline volcanic rocks. They represent deposition on a fault‐controlled floodplain, with marginal alluvial fans, on a volcanic arc. Finely laminated mudstone and occasional g...
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crwiley:10.1111/j.1365-3091.1982.tb00076.x 2024-09-15T17:40:49+00:00 Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica FARQUHARSON, G. W. 1982 http://dx.doi.org/10.1111/j.1365-3091.1982.tb00076.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1982.tb00076.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1982.tb00076.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Sedimentology volume 29, issue 5, page 717-725 ISSN 0037-0746 1365-3091 journal-article 1982 crwiley https://doi.org/10.1111/j.1365-3091.1982.tb00076.x 2024-07-25T04:21:38Z ABSTRACT Sedimentary rocks of late Mesozoic age exposed at Camp Hill, northern Antarctic Peninsula, are associated with calc‐alkaline volcanic rocks. They represent deposition on a fault‐controlled floodplain, with marginal alluvial fans, on a volcanic arc. Finely laminated mudstone and occasional graded laminae were deposited from suspension and by density underflow currents, respectively, in small shallow lakes. Thickening‐ and coarsening‐upward sandstone bodies overlying the lake deposits are interpreted as lacustrine deltas of which two types are preserved: (1) Gilbert‐type with steep foresets and (2) mouth‐bar type which lack steep foresets. Sections through the latter type reveal the presence of sub‐environments characteristic of fluvial‐dominated marine deltas, i.e. prodelta, distributary mouth‐bar and distributary channel. Abandoned mouth‐bars resulting from avulsion are recognized. It is suggested that the processes which operated during formation of the mouth‐bar deltas resulted from hyperpycnal flow. By contrast, the Gilbert‐type delta is thought to be the consequence of a reduced inflow of suspended sediment causing homopycnal flow, and thorough mixing of the river and lake waters. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Wiley Online Library Sedimentology 29 5 717 725 |
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Wiley Online Library |
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English |
description |
ABSTRACT Sedimentary rocks of late Mesozoic age exposed at Camp Hill, northern Antarctic Peninsula, are associated with calc‐alkaline volcanic rocks. They represent deposition on a fault‐controlled floodplain, with marginal alluvial fans, on a volcanic arc. Finely laminated mudstone and occasional graded laminae were deposited from suspension and by density underflow currents, respectively, in small shallow lakes. Thickening‐ and coarsening‐upward sandstone bodies overlying the lake deposits are interpreted as lacustrine deltas of which two types are preserved: (1) Gilbert‐type with steep foresets and (2) mouth‐bar type which lack steep foresets. Sections through the latter type reveal the presence of sub‐environments characteristic of fluvial‐dominated marine deltas, i.e. prodelta, distributary mouth‐bar and distributary channel. Abandoned mouth‐bars resulting from avulsion are recognized. It is suggested that the processes which operated during formation of the mouth‐bar deltas resulted from hyperpycnal flow. By contrast, the Gilbert‐type delta is thought to be the consequence of a reduced inflow of suspended sediment causing homopycnal flow, and thorough mixing of the river and lake waters. |
format |
Article in Journal/Newspaper |
author |
FARQUHARSON, G. W. |
spellingShingle |
FARQUHARSON, G. W. Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
author_facet |
FARQUHARSON, G. W. |
author_sort |
FARQUHARSON, G. W. |
title |
Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
title_short |
Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
title_full |
Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
title_fullStr |
Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
title_full_unstemmed |
Lacustrine deltas in a Mesozoic alluvial sequence from Camp Hill, Antarctica |
title_sort |
lacustrine deltas in a mesozoic alluvial sequence from camp hill, antarctica |
publisher |
Wiley |
publishDate |
1982 |
url |
http://dx.doi.org/10.1111/j.1365-3091.1982.tb00076.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-3091.1982.tb00076.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-3091.1982.tb00076.x |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica |
op_source |
Sedimentology volume 29, issue 5, page 717-725 ISSN 0037-0746 1365-3091 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-3091.1982.tb00076.x |
container_title |
Sedimentology |
container_volume |
29 |
container_issue |
5 |
container_start_page |
717 |
op_container_end_page |
725 |
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1810486859539677184 |