Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land
Rhyolitic volcanism along the proto-Pacific margin of Gondwana occurred at intervals throughout the Jurassic. Silicic melt generation has been interpreted as a result of interaction between mantle plumes and subduction modified lower crust. The rhyolitic Mount Poster Formation of the southern Antarc...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/s0954102004001944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102004001944 |
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crcambridgeupr:10.1017/s0954102004001944 2024-03-03T08:37:50+00:00 Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land HUNTER, MORAG A. RILEY, TEAL R. MILLAR, IAN L. 2004 http://dx.doi.org/10.1017/s0954102004001944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102004001944 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 16, issue 2, page 185-190 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2004 crcambridgeupr https://doi.org/10.1017/s0954102004001944 2024-02-08T08:38:44Z Rhyolitic volcanism along the proto-Pacific margin of Gondwana occurred at intervals throughout the Jurassic. Silicic melt generation has been interpreted as a result of interaction between mantle plumes and subduction modified lower crust. The rhyolitic Mount Poster Formation of the southern Antarctic Peninsula is c. 184 Ma in age (V1), whereas silicic volcanism of the northern Antarctic Peninsula is c. 168 Ma (V2). A thin, (13.5 cm) reworked air fall tuff, interbedded with sandstone and mudstone of the Latady Formation in the southern Antarctic Peninsula has a REE pattern similar to V2 volcanic material but is isotopically similar to the extracaldera, low-Ti rhyolites of the V1 Mount Poster Formation. The tuff is interbedded with lithofacies that have been assigned a Callovian age (164–159 Ma) in the west of the area. Simple mixing between a MASH source and reworked Early Jurassic (184 Ma) V1 volcanic material during V2 volcanism in the area explains the apparent discrepancy between the faunal age and the isotopic characteristics of the ash fall. This supports a Middle Jurassic (168 Ma) age that also corresponds to a 167 ± 3 Ma age from Mt Rex on the periphery of the Mount Poster Formation, which was previously thought to be anomalous. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Cambridge University Press Antarctic Antarctic Peninsula Pacific Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) Latady ENVELOPE(-65.833,-65.833,-75.500,-75.500) Mount Poster ENVELOPE(-65.652,-65.652,-74.688,-74.688) Antarctic Science 16 2 185 190 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography HUNTER, MORAG A. RILEY, TEAL R. MILLAR, IAN L. Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Rhyolitic volcanism along the proto-Pacific margin of Gondwana occurred at intervals throughout the Jurassic. Silicic melt generation has been interpreted as a result of interaction between mantle plumes and subduction modified lower crust. The rhyolitic Mount Poster Formation of the southern Antarctic Peninsula is c. 184 Ma in age (V1), whereas silicic volcanism of the northern Antarctic Peninsula is c. 168 Ma (V2). A thin, (13.5 cm) reworked air fall tuff, interbedded with sandstone and mudstone of the Latady Formation in the southern Antarctic Peninsula has a REE pattern similar to V2 volcanic material but is isotopically similar to the extracaldera, low-Ti rhyolites of the V1 Mount Poster Formation. The tuff is interbedded with lithofacies that have been assigned a Callovian age (164–159 Ma) in the west of the area. Simple mixing between a MASH source and reworked Early Jurassic (184 Ma) V1 volcanic material during V2 volcanism in the area explains the apparent discrepancy between the faunal age and the isotopic characteristics of the ash fall. This supports a Middle Jurassic (168 Ma) age that also corresponds to a 167 ± 3 Ma age from Mt Rex on the periphery of the Mount Poster Formation, which was previously thought to be anomalous. |
format |
Article in Journal/Newspaper |
author |
HUNTER, MORAG A. RILEY, TEAL R. MILLAR, IAN L. |
author_facet |
HUNTER, MORAG A. RILEY, TEAL R. MILLAR, IAN L. |
author_sort |
HUNTER, MORAG A. |
title |
Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
title_short |
Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
title_full |
Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
title_fullStr |
Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
title_full_unstemmed |
Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land |
title_sort |
middle jurassic air fall tuff in the sedimentary latady formation, eastern ellsworth land |
publisher |
Cambridge University Press (CUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1017/s0954102004001944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102004001944 |
long_lat |
ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(-65.833,-65.833,-75.500,-75.500) ENVELOPE(-65.652,-65.652,-74.688,-74.688) |
geographic |
Antarctic Antarctic Peninsula Pacific Ellsworth Land Latady Mount Poster |
geographic_facet |
Antarctic Antarctic Peninsula Pacific Ellsworth Land Latady Mount Poster |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science |
op_source |
Antarctic Science volume 16, issue 2, page 185-190 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102004001944 |
container_title |
Antarctic Science |
container_volume |
16 |
container_issue |
2 |
container_start_page |
185 |
op_container_end_page |
190 |
_version_ |
1792502077230940160 |