Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula
Depleted mantle model ages derived from granitoids of the Lassiter Coast Intrusive Suite, sampled over a wide geographical area in eastern Ellsworth Land, Antarctica, cluster between 1000 Ma and 1200 Ma and suggest involvement of Proterozoic crust in the petrogenesis of the suite. Ion-microprobe U–P...
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Online Access: | http://dx.doi.org/10.1017/s0954102005002877 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002877 |
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crcambridgeupr:10.1017/s0954102005002877 2024-09-15T17:48:40+00:00 Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula FLOWERDEW, M.J. MILLAR, I.L. VAUGHAN, A.P.M. PANKHURST, R.J. 2005 http://dx.doi.org/10.1017/s0954102005002877 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002877 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 17, issue 3, page 443-452 ISSN 0954-1020 1365-2079 journal-article 2005 crcambridgeupr https://doi.org/10.1017/s0954102005002877 2024-07-31T04:03:44Z Depleted mantle model ages derived from granitoids of the Lassiter Coast Intrusive Suite, sampled over a wide geographical area in eastern Ellsworth Land, Antarctica, cluster between 1000 Ma and 1200 Ma and suggest involvement of Proterozoic crust in the petrogenesis of the suite. Ion-microprobe U–Pb zircon analyses from a small intrusion at Mount Harry, situated at the English Coast, yield a concordant age of 105.2 ± 1.1 Ma, consistent with published ages from other parts of the Lassiter Coast Intrusive Suite. Significant variation in the Sr and Nd isotope composition of the granitoids, along the extrapolation of the Eastern Palmer Land Shear Zone (a proposed terrane boundary) located close to the English Coast, is not evident. However, the isotope signature at the English Coast is more homogeneous than the Lassiter Coast; this variation may relate to geographical proximity to the Pacific margin during intrusion, may reflect subtle changes in basement with a broadly similar character across the proposed terrane boundary, or suggest that any major fault structure is located further to the north, with implications for the kinematics of regional mid-Cretaceous transpression. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Palmer Land Cambridge University Press Antarctic Science 17 3 443 452 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Depleted mantle model ages derived from granitoids of the Lassiter Coast Intrusive Suite, sampled over a wide geographical area in eastern Ellsworth Land, Antarctica, cluster between 1000 Ma and 1200 Ma and suggest involvement of Proterozoic crust in the petrogenesis of the suite. Ion-microprobe U–Pb zircon analyses from a small intrusion at Mount Harry, situated at the English Coast, yield a concordant age of 105.2 ± 1.1 Ma, consistent with published ages from other parts of the Lassiter Coast Intrusive Suite. Significant variation in the Sr and Nd isotope composition of the granitoids, along the extrapolation of the Eastern Palmer Land Shear Zone (a proposed terrane boundary) located close to the English Coast, is not evident. However, the isotope signature at the English Coast is more homogeneous than the Lassiter Coast; this variation may relate to geographical proximity to the Pacific margin during intrusion, may reflect subtle changes in basement with a broadly similar character across the proposed terrane boundary, or suggest that any major fault structure is located further to the north, with implications for the kinematics of regional mid-Cretaceous transpression. |
format |
Article in Journal/Newspaper |
author |
FLOWERDEW, M.J. MILLAR, I.L. VAUGHAN, A.P.M. PANKHURST, R.J. |
spellingShingle |
FLOWERDEW, M.J. MILLAR, I.L. VAUGHAN, A.P.M. PANKHURST, R.J. Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
author_facet |
FLOWERDEW, M.J. MILLAR, I.L. VAUGHAN, A.P.M. PANKHURST, R.J. |
author_sort |
FLOWERDEW, M.J. |
title |
Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
title_short |
Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
title_full |
Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
title_fullStr |
Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
title_full_unstemmed |
Age and tectonic significance of the Lassiter Coast Intrusive Suite, Eastern Ellsworth Land, Antarctic Peninsula |
title_sort |
age and tectonic significance of the lassiter coast intrusive suite, eastern ellsworth land, antarctic peninsula |
publisher |
Cambridge University Press (CUP) |
publishDate |
2005 |
url |
http://dx.doi.org/10.1017/s0954102005002877 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002877 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Palmer Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Palmer Land |
op_source |
Antarctic Science volume 17, issue 3, page 443-452 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102005002877 |
container_title |
Antarctic Science |
container_volume |
17 |
container_issue |
3 |
container_start_page |
443 |
op_container_end_page |
452 |
_version_ |
1810290142524473344 |