Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events
Abstract Late Neogene Sirius Group strata from Tillite Spur and Quartz Hills in the Reedy Glacier area, Antarctica, demonstrate the variability in Sirius Group facies and contrasts Sirius Group strata deposited at high and low paleo-elevation, respectively. The Tillite Spur and Quartz Hills Formatio...
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Cambridge University Press (CUP)
1998
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Online Access: | http://dx.doi.org/10.1017/s0022143000001957 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001957 |
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crcambridgeupr:10.1017/s0022143000001957 2024-09-15T17:48:37+00:00 Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events Wilson, Gary S. Harwood, David M. Askin, Rosemary A. Levy, Richard H. 1998 http://dx.doi.org/10.1017/s0022143000001957 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001957 en eng Cambridge University Press (CUP) Journal of Glaciology volume 44, issue 148, page 437-447 ISSN 0022-1430 1727-5652 journal-article 1998 crcambridgeupr https://doi.org/10.1017/s0022143000001957 2024-07-31T04:01:29Z Abstract Late Neogene Sirius Group strata from Tillite Spur and Quartz Hills in the Reedy Glacier area, Antarctica, demonstrate the variability in Sirius Group facies and contrasts Sirius Group strata deposited at high and low paleo-elevation, respectively. The Tillite Spur and Quartz Hills Formations (Pliocene) are formally defined here.The Tillite Spur Formation type section crops out on the edge of the Wisconsin Plateau overlooking Tillite Spur. It comprises 32m of alternating coarse gray conglomerate and muddy olive-brown diamictites. The Quartz Hills Formation type section crops out above the western margin of Reedy Glacier in a pre-existing cirque towards the southern end of the Quartz Hills. It comprises c.100m of alternating massive diamictites and rhythmically interbedded sandstone and laminated mudstones which were deposited close to sea level and subsequently rapidly uplifted (>500 m Myr −1 ) to their present elevation at c. 1500 m. Three orders of paleoclimatic variability are recorded in the Sirius Group strata from Reedy Valley: (1) recycled marine microfloras in glacial diamictites indicate intervals of marine incursion into the Antarctic cratonic interior co-occurring with reductions in the East Antarctic ice sheet; (2) an advancing and retreating paleo-Reedy Glacier deposited a glacial/interglacial sequence alternating on a 10-100 kyr scale; 3) Centimeter and millimeter stratification in strata of the Quartz Hills Formation record annual kyr scale variability. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology Reedy Glacier Cambridge University Press Journal of Glaciology 44 148 437 447 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Late Neogene Sirius Group strata from Tillite Spur and Quartz Hills in the Reedy Glacier area, Antarctica, demonstrate the variability in Sirius Group facies and contrasts Sirius Group strata deposited at high and low paleo-elevation, respectively. The Tillite Spur and Quartz Hills Formations (Pliocene) are formally defined here.The Tillite Spur Formation type section crops out on the edge of the Wisconsin Plateau overlooking Tillite Spur. It comprises 32m of alternating coarse gray conglomerate and muddy olive-brown diamictites. The Quartz Hills Formation type section crops out above the western margin of Reedy Glacier in a pre-existing cirque towards the southern end of the Quartz Hills. It comprises c.100m of alternating massive diamictites and rhythmically interbedded sandstone and laminated mudstones which were deposited close to sea level and subsequently rapidly uplifted (>500 m Myr −1 ) to their present elevation at c. 1500 m. Three orders of paleoclimatic variability are recorded in the Sirius Group strata from Reedy Valley: (1) recycled marine microfloras in glacial diamictites indicate intervals of marine incursion into the Antarctic cratonic interior co-occurring with reductions in the East Antarctic ice sheet; (2) an advancing and retreating paleo-Reedy Glacier deposited a glacial/interglacial sequence alternating on a 10-100 kyr scale; 3) Centimeter and millimeter stratification in strata of the Quartz Hills Formation record annual kyr scale variability. |
format |
Article in Journal/Newspaper |
author |
Wilson, Gary S. Harwood, David M. Askin, Rosemary A. Levy, Richard H. |
spellingShingle |
Wilson, Gary S. Harwood, David M. Askin, Rosemary A. Levy, Richard H. Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
author_facet |
Wilson, Gary S. Harwood, David M. Askin, Rosemary A. Levy, Richard H. |
author_sort |
Wilson, Gary S. |
title |
Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
title_short |
Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
title_full |
Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
title_fullStr |
Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
title_full_unstemmed |
Late Neogene Sirius Group strata in Reedy Valley, Antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
title_sort |
late neogene sirius group strata in reedy valley, antarctica: a multiple-resolution record of climate, ice-sheet and sea-level events |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1017/s0022143000001957 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001957 |
genre |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology Reedy Glacier |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology Reedy Glacier |
op_source |
Journal of Glaciology volume 44, issue 148, page 437-447 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000001957 |
container_title |
Journal of Glaciology |
container_volume |
44 |
container_issue |
148 |
container_start_page |
437 |
op_container_end_page |
447 |
_version_ |
1810290056431140864 |