Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica
Ages of six volcanic and plutonic rocks on Barton Peninsula, King George Island, were determined using 40Ar/39Ar and K-Ar isotopic systems. The 40Ar/39Ar and K-Ar ages of basaltic andesite and diorite range from 48 My to 74 My and systematically decrease toward the upper stratigraphic section. Two s...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/2205 2023-05-15T14:01:21+02:00 Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica Kim, Hyeoncheol IK Lee, Jong Young Chose, Moon Cho, Moonsup Zheng, Xiangshen Sang, Haiquing Qiu, Ji 2000-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2205 https://doi.org/10.3402/polar.v19i2.6549 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2205/5456 https://polarresearch.net/index.php/polar/article/view/2205 doi:10.3402/polar.v19i2.6549 Copyright (c) 2018 Polar Research Polar Research; Vol. 19 No. 2 (2000); 251-260 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2000 ftjpolarres https://doi.org/10.3402/polar.v19i2.6549 2021-11-11T19:12:09Z Ages of six volcanic and plutonic rocks on Barton Peninsula, King George Island, were determined using 40Ar/39Ar and K-Ar isotopic systems. The 40Ar/39Ar and K-Ar ages of basaltic andesite and diorite range from 48 My to 74 My and systematically decrease toward the upper stratigraphic section. Two specimens of basaltic andesite which occur in the lowermost sequence of the peninsula, however, apparently define two distinct plateau ages of 52-53 My and 119-120 My. The latter is interpreted to represent the primary cooling age of basaltic andesite, whereas the former is interpreted as the thermally-reset age caused by the intrusion of Tertiary granitic pluton. The isochron ages calculated from the isotope correlation diagram corroborate our interpretation based on the apparent plateau ages. It is therefore likely that volcanism was active during the Early Cretaceous on Barton Peninsula. When the K-Ar ages of previous studies are taken into account with our result, the ages of basaltic andesite in the northern part of the Barton Peninsula are significantly older than those in the southern part. Across the north-west-south-east trending Barton fault bounding the two parts, there are significant differences in geochronologic and geologic aspects. Article in Journal/Newspaper Antarc* Antarctica King George Island Polar Research Polar Research (E-Journal) King George Island Barton ENVELOPE(-58.733,-58.733,-62.233,-62.233) Barton Peninsula ENVELOPE(-58.741,-58.741,-62.227,-62.227) Polar Research 19 2 251 260 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Ages of six volcanic and plutonic rocks on Barton Peninsula, King George Island, were determined using 40Ar/39Ar and K-Ar isotopic systems. The 40Ar/39Ar and K-Ar ages of basaltic andesite and diorite range from 48 My to 74 My and systematically decrease toward the upper stratigraphic section. Two specimens of basaltic andesite which occur in the lowermost sequence of the peninsula, however, apparently define two distinct plateau ages of 52-53 My and 119-120 My. The latter is interpreted to represent the primary cooling age of basaltic andesite, whereas the former is interpreted as the thermally-reset age caused by the intrusion of Tertiary granitic pluton. The isochron ages calculated from the isotope correlation diagram corroborate our interpretation based on the apparent plateau ages. It is therefore likely that volcanism was active during the Early Cretaceous on Barton Peninsula. When the K-Ar ages of previous studies are taken into account with our result, the ages of basaltic andesite in the northern part of the Barton Peninsula are significantly older than those in the southern part. Across the north-west-south-east trending Barton fault bounding the two parts, there are significant differences in geochronologic and geologic aspects. |
format |
Article in Journal/Newspaper |
author |
Kim, Hyeoncheol IK Lee, Jong Young Chose, Moon Cho, Moonsup Zheng, Xiangshen Sang, Haiquing Qiu, Ji |
spellingShingle |
Kim, Hyeoncheol IK Lee, Jong Young Chose, Moon Cho, Moonsup Zheng, Xiangshen Sang, Haiquing Qiu, Ji Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
author_facet |
Kim, Hyeoncheol IK Lee, Jong Young Chose, Moon Cho, Moonsup Zheng, Xiangshen Sang, Haiquing Qiu, Ji |
author_sort |
Kim, Hyeoncheol |
title |
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
title_short |
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
title_full |
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
title_fullStr |
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
title_full_unstemmed |
Geochronologic evidence for Early Cretaceous volcanic activity on Barton Peninsula, King George Island, Antarctica |
title_sort |
geochronologic evidence for early cretaceous volcanic activity on barton peninsula, king george island, antarctica |
publisher |
Norwegian Polar Institute |
publishDate |
2000 |
url |
https://polarresearch.net/index.php/polar/article/view/2205 https://doi.org/10.3402/polar.v19i2.6549 |
long_lat |
ENVELOPE(-58.733,-58.733,-62.233,-62.233) ENVELOPE(-58.741,-58.741,-62.227,-62.227) |
geographic |
King George Island Barton Barton Peninsula |
geographic_facet |
King George Island Barton Barton Peninsula |
genre |
Antarc* Antarctica King George Island Polar Research |
genre_facet |
Antarc* Antarctica King George Island Polar Research |
op_source |
Polar Research; Vol. 19 No. 2 (2000); 251-260 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2205/5456 https://polarresearch.net/index.php/polar/article/view/2205 doi:10.3402/polar.v19i2.6549 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v19i2.6549 |
container_title |
Polar Research |
container_volume |
19 |
container_issue |
2 |
container_start_page |
251 |
op_container_end_page |
260 |
_version_ |
1766271078739476480 |