Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica
Fisher Massif consists of Mesoproterozoic ( c. 1300 Ma) lower amphibolite-facies metavolcanic rocks and associated metasediments, intruded by a variety of subvolcanic and plutonic bodies (gabbro to granite). It differs in both composition and metamorphic grade from the rest of the northern Prince Ch...
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crcambridgeupr:10.1017/s0954102096000120 2024-09-15T17:48:39+00:00 Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica Mikhalsky, E. V. Sheraton, J. W. Laiba, A. A. Beliatsky, B. V. 1996 http://dx.doi.org/10.1017/s0954102096000120 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102096000120 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 8, issue 1, page 85-104 ISSN 0954-1020 1365-2079 journal-article 1996 crcambridgeupr https://doi.org/10.1017/s0954102096000120 2024-07-31T04:03:56Z Fisher Massif consists of Mesoproterozoic ( c. 1300 Ma) lower amphibolite-facies metavolcanic rocks and associated metasediments, intruded by a variety of subvolcanic and plutonic bodies (gabbro to granite). It differs in both composition and metamorphic grade from the rest of the northern Prince Charles Mountains, which were metamorphosed to granulite facies about 1000 m.y. ago. The metavolcanic rocks consist mainly of basalt, but basaltic andesite, andesite, and more felsic rocks (dacite, rhyodacite, and rhyolite) are also common. Most of the basaltic rocks have compositions similar to low-K island arc tholeiites, but some are relatively Nb-rich and more akin to P-MORB. Intermediate to felsic medium to high-K volcanic rocks, which appear to postdate the basaltic succession, have calc-alkaline affinities and probably include a significant crustal component. On the present data, an active continental margin with associated island arc was the most likely tectonic setting for generation of the Fisher Massif volcanic rocks. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains Cambridge University Press Antarctic Science 8 1 85 104 |
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Open Polar |
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Cambridge University Press |
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English |
description |
Fisher Massif consists of Mesoproterozoic ( c. 1300 Ma) lower amphibolite-facies metavolcanic rocks and associated metasediments, intruded by a variety of subvolcanic and plutonic bodies (gabbro to granite). It differs in both composition and metamorphic grade from the rest of the northern Prince Charles Mountains, which were metamorphosed to granulite facies about 1000 m.y. ago. The metavolcanic rocks consist mainly of basalt, but basaltic andesite, andesite, and more felsic rocks (dacite, rhyodacite, and rhyolite) are also common. Most of the basaltic rocks have compositions similar to low-K island arc tholeiites, but some are relatively Nb-rich and more akin to P-MORB. Intermediate to felsic medium to high-K volcanic rocks, which appear to postdate the basaltic succession, have calc-alkaline affinities and probably include a significant crustal component. On the present data, an active continental margin with associated island arc was the most likely tectonic setting for generation of the Fisher Massif volcanic rocks. |
format |
Article in Journal/Newspaper |
author |
Mikhalsky, E. V. Sheraton, J. W. Laiba, A. A. Beliatsky, B. V. |
spellingShingle |
Mikhalsky, E. V. Sheraton, J. W. Laiba, A. A. Beliatsky, B. V. Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
author_facet |
Mikhalsky, E. V. Sheraton, J. W. Laiba, A. A. Beliatsky, B. V. |
author_sort |
Mikhalsky, E. V. |
title |
Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
title_short |
Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
title_full |
Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
title_fullStr |
Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Geochemistry and origin of Mesoproterozoic metavolcanic rocks from Fisher Massif, Prince Charles Mountains, East Antarctica |
title_sort |
geochemistry and origin of mesoproterozoic metavolcanic rocks from fisher massif, prince charles mountains, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s0954102096000120 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102096000120 |
genre |
Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains |
op_source |
Antarctic Science volume 8, issue 1, page 85-104 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102096000120 |
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Antarctic Science |
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8 |
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1 |
container_start_page |
85 |
op_container_end_page |
104 |
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1810290115199631360 |