Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica
The late Proterozoic basement of the Porthos Range northern Prince Charles Mountains, east Antarctica, is dominated by a suite of felsic to mafic granulites derived from igneous and, less importantly, sedimentary protoliths. Compositionally, they are broadly similar to granulites occurring along the...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/s0954102092000129 2024-09-09T19:07:37+00:00 Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica Munksgaard, N.C. Thost, D.E. Hensen, B.J. 1992 http://dx.doi.org/10.1017/s0954102092000129 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000129 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 4, issue 1, page 59-69 ISSN 0954-1020 1365-2079 journal-article 1992 crcambridgeupr https://doi.org/10.1017/s0954102092000129 2024-07-24T04:03:54Z The late Proterozoic basement of the Porthos Range northern Prince Charles Mountains, east Antarctica, is dominated by a suite of felsic to mafic granulites derived from igneous and, less importantly, sedimentary protoliths. Compositionally, they are broadly similar to granulites occurring along the Mac. Robertson Land coast and southern Prince Charles Mountains. Ultramafic to mafic orthopyroxene' + clinopyroxene granulites with relict igneous layering occur as lenses within the felsic to mafic granulites, and show compositional evidence of a cumulate origin. The felsic to mafic granulites are intruded by several large charnockite bodies that have similarities to the Mawson Charnockite, and may have formed via a two-stage partial melting process. The charnockite and host granulites are chemically very similar, and both may have been derived from a common middle to lower crustal source region. Undepleted K/Rb ratios suggest retention of original chemistry, with variations being due to fractionation processes. Normalized trace element patterns resembling modern-day arc settings suggest that the Porthos Range granulites were possibly generated in a subduction zone environment. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Prince Charles Mountains Cambridge University Press East Antarctica Mac. Robertson Land ENVELOPE(65.000,65.000,-70.000,-70.000) Porthos Range ENVELOPE(65.655,65.655,-70.445,-70.445) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Antarctic Science 4 1 59 69 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
The late Proterozoic basement of the Porthos Range northern Prince Charles Mountains, east Antarctica, is dominated by a suite of felsic to mafic granulites derived from igneous and, less importantly, sedimentary protoliths. Compositionally, they are broadly similar to granulites occurring along the Mac. Robertson Land coast and southern Prince Charles Mountains. Ultramafic to mafic orthopyroxene' + clinopyroxene granulites with relict igneous layering occur as lenses within the felsic to mafic granulites, and show compositional evidence of a cumulate origin. The felsic to mafic granulites are intruded by several large charnockite bodies that have similarities to the Mawson Charnockite, and may have formed via a two-stage partial melting process. The charnockite and host granulites are chemically very similar, and both may have been derived from a common middle to lower crustal source region. Undepleted K/Rb ratios suggest retention of original chemistry, with variations being due to fractionation processes. Normalized trace element patterns resembling modern-day arc settings suggest that the Porthos Range granulites were possibly generated in a subduction zone environment. |
format |
Article in Journal/Newspaper |
author |
Munksgaard, N.C. Thost, D.E. Hensen, B.J. |
spellingShingle |
Munksgaard, N.C. Thost, D.E. Hensen, B.J. Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
author_facet |
Munksgaard, N.C. Thost, D.E. Hensen, B.J. |
author_sort |
Munksgaard, N.C. |
title |
Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
title_short |
Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
title_full |
Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
title_fullStr |
Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Geochemistry of Proterozoic granulites from northern Prince Charles Mountains, East Antarctica |
title_sort |
geochemistry of proterozoic granulites from northern prince charles mountains, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1992 |
url |
http://dx.doi.org/10.1017/s0954102092000129 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000129 |
long_lat |
ENVELOPE(65.000,65.000,-70.000,-70.000) ENVELOPE(65.655,65.655,-70.445,-70.445) ENVELOPE(67.246,67.246,-71.427,-71.427) |
geographic |
East Antarctica Mac. Robertson Land Porthos Range Prince Charles Mountains |
geographic_facet |
East Antarctica Mac. Robertson Land Porthos Range Prince Charles Mountains |
genre |
Antarc* Antarctic Science Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica Mac Robertson Land Mac. Robertson Land Prince Charles Mountains |
op_source |
Antarctic Science volume 4, issue 1, page 59-69 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102092000129 |
container_title |
Antarctic Science |
container_volume |
4 |
container_issue |
1 |
container_start_page |
59 |
op_container_end_page |
69 |
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1809821777162928128 |