Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land
Detailed geological mapping and geochemical analysis of early Palaeozoic granitoid plutons and dykes from the Taylor Valley and Ferrar Glacier region in south Victoria Land reveal two distinct suites. This suite subdivision-approach is a departure from previous lithology-based schemes and can be app...
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Cambridge University Press (CUP)
1992
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Online Access: | http://dx.doi.org/10.1017/s0954102092000130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000130 |
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crcambridgeupr:10.1017/s0954102092000130 2024-09-15T17:49:05+00:00 Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land Smillie, Robert W. 1992 http://dx.doi.org/10.1017/s0954102092000130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000130 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 4, issue 1, page 71-87 ISSN 0954-1020 1365-2079 journal-article 1992 crcambridgeupr https://doi.org/10.1017/s0954102092000130 2024-07-31T04:03:44Z Detailed geological mapping and geochemical analysis of early Palaeozoic granitoid plutons and dykes from the Taylor Valley and Ferrar Glacier region in south Victoria Land reveal two distinct suites. This suite subdivision-approach is a departure from previous lithology-based schemes and can be applied elsewhere in south Victoria Land. The older calc-alkaline Dry Valleys 1 suite is dominated by the compositionally variable Bonney Pluton, a flow-foliated concordant pluton with an inferred length of over 100 km. Plutons of this suite are elongate in a NW-SE direction and appear to have been subjected to major structural control during their emplacement. The younger alkali-calcic Dry Valleys 2 suite comprises discordant plutons and numerous dyke swarms with complex age relationships. Field characteristics of this suite indicate that it was passively emplaced into fractures at higher levels in the crust than the Dry Valleys 1 suite. Whole-rock geochemistry confirms this suite subdivision based on field relationships and indicates that the two suites were derived from different parent magmas by fractional crystallization. The Dry Valleys 1 suite resembles Cordilleran I-type granitoids and is inferred to be derived from partial melting of the upper mantle and/or lower crust above an ancient subduction zone. The Dry Valleys 2 suite resembles Caledonian I-type granitoids and may have resulted from a later episode of crustal extension. Article in Journal/Newspaper Antarctic Science Ferrar Glacier Victoria Land Cambridge University Press Antarctic Science 4 1 71 87 |
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Cambridge University Press |
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English |
description |
Detailed geological mapping and geochemical analysis of early Palaeozoic granitoid plutons and dykes from the Taylor Valley and Ferrar Glacier region in south Victoria Land reveal two distinct suites. This suite subdivision-approach is a departure from previous lithology-based schemes and can be applied elsewhere in south Victoria Land. The older calc-alkaline Dry Valleys 1 suite is dominated by the compositionally variable Bonney Pluton, a flow-foliated concordant pluton with an inferred length of over 100 km. Plutons of this suite are elongate in a NW-SE direction and appear to have been subjected to major structural control during their emplacement. The younger alkali-calcic Dry Valleys 2 suite comprises discordant plutons and numerous dyke swarms with complex age relationships. Field characteristics of this suite indicate that it was passively emplaced into fractures at higher levels in the crust than the Dry Valleys 1 suite. Whole-rock geochemistry confirms this suite subdivision based on field relationships and indicates that the two suites were derived from different parent magmas by fractional crystallization. The Dry Valleys 1 suite resembles Cordilleran I-type granitoids and is inferred to be derived from partial melting of the upper mantle and/or lower crust above an ancient subduction zone. The Dry Valleys 2 suite resembles Caledonian I-type granitoids and may have resulted from a later episode of crustal extension. |
format |
Article in Journal/Newspaper |
author |
Smillie, Robert W. |
spellingShingle |
Smillie, Robert W. Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
author_facet |
Smillie, Robert W. |
author_sort |
Smillie, Robert W. |
title |
Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
title_short |
Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
title_full |
Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
title_fullStr |
Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
title_full_unstemmed |
Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land |
title_sort |
suite subdivision and petrological evolution of granitoids from the taylor valley and ferrar glacier region, south victoria land |
publisher |
Cambridge University Press (CUP) |
publishDate |
1992 |
url |
http://dx.doi.org/10.1017/s0954102092000130 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102092000130 |
genre |
Antarctic Science Ferrar Glacier Victoria Land |
genre_facet |
Antarctic Science Ferrar Glacier Victoria Land |
op_source |
Antarctic Science volume 4, issue 1, page 71-87 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102092000130 |
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Antarctic Science |
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4 |
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1 |
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71 |
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87 |
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1810290793429073920 |