On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica
Abstract Evaluating pressure–temperature ( P – T ) conditions through mineral equilibria modelling within an amphibolite facies polymetamorphic terrane requires knowledge of the fluid content of the rocks. The Archean‐Palaeoproterozoic basement rocks of the Ruker Province, East Antarctica, preserve...
Published in: | Journal of Metamorphic Geology |
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crwiley:10.1111/j.1525-1314.2007.00732.x 2024-06-02T07:58:18+00:00 On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica PHILLIPS, G. WHITE, R. W. WILSON, C. J. L. 2007 http://dx.doi.org/10.1111/j.1525-1314.2007.00732.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.2007.00732.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.2007.00732.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Metamorphic Geology volume 25, issue 8, page 855-871 ISSN 0263-4929 1525-1314 journal-article 2007 crwiley https://doi.org/10.1111/j.1525-1314.2007.00732.x 2024-05-03T10:58:31Z Abstract Evaluating pressure–temperature ( P – T ) conditions through mineral equilibria modelling within an amphibolite facies polymetamorphic terrane requires knowledge of the fluid content of the rocks. The Archean‐Palaeoproterozoic basement rocks of the Ruker Province, East Antarctica, preserve evidence of three metamorphic events (M1–M3). Of particular interest is the M3 event, which is constrained to the early Palaeozoic ( c. 550–480 Ma). Evaluation of the tectonic setting during this time is important because the Ruker Province is located within a critical region with respect to models of Gondwana assembly. Structural evidence of the early Palaeozoic event is preserved as large (up to ∼500 m wide) high strain zones that cut the orthogneiss‐metasedimentary basement (Tingey Complex) of the Ruker Province. Rocks within these zones have been thoroughly recrystallized and preserve a dominant shear fabric and M3 mineral assemblages that formed at P – T conditions of 4.0–5.2 kbar and 565–640 °C. Distal to these zones, rocks preserve more complex petrographic relationships with S1 and S2 foliations, being incompletely overgrown by M3 retrograde assemblages. We show that the mineral assemblages preserved during the M3 event are highly dependent on the availability of fluid H 2 O, which is strongly influenced by the structural setting (i.e. proximity to the high‐strain zones). P – T structural and fluid flow constraints support a model of basin inversion during early Palaeozoic crustal rejuvenation in the Ruker Province. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Wiley Online Library East Antarctica Ruker ENVELOPE(64.583,64.583,-73.583,-73.583) Journal of Metamorphic Geology 25 8 855 871 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Evaluating pressure–temperature ( P – T ) conditions through mineral equilibria modelling within an amphibolite facies polymetamorphic terrane requires knowledge of the fluid content of the rocks. The Archean‐Palaeoproterozoic basement rocks of the Ruker Province, East Antarctica, preserve evidence of three metamorphic events (M1–M3). Of particular interest is the M3 event, which is constrained to the early Palaeozoic ( c. 550–480 Ma). Evaluation of the tectonic setting during this time is important because the Ruker Province is located within a critical region with respect to models of Gondwana assembly. Structural evidence of the early Palaeozoic event is preserved as large (up to ∼500 m wide) high strain zones that cut the orthogneiss‐metasedimentary basement (Tingey Complex) of the Ruker Province. Rocks within these zones have been thoroughly recrystallized and preserve a dominant shear fabric and M3 mineral assemblages that formed at P – T conditions of 4.0–5.2 kbar and 565–640 °C. Distal to these zones, rocks preserve more complex petrographic relationships with S1 and S2 foliations, being incompletely overgrown by M3 retrograde assemblages. We show that the mineral assemblages preserved during the M3 event are highly dependent on the availability of fluid H 2 O, which is strongly influenced by the structural setting (i.e. proximity to the high‐strain zones). P – T structural and fluid flow constraints support a model of basin inversion during early Palaeozoic crustal rejuvenation in the Ruker Province. |
format |
Article in Journal/Newspaper |
author |
PHILLIPS, G. WHITE, R. W. WILSON, C. J. L. |
spellingShingle |
PHILLIPS, G. WHITE, R. W. WILSON, C. J. L. On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
author_facet |
PHILLIPS, G. WHITE, R. W. WILSON, C. J. L. |
author_sort |
PHILLIPS, G. |
title |
On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
title_short |
On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
title_full |
On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
title_fullStr |
On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
title_full_unstemmed |
On the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the Ruker Province, East Antarctica |
title_sort |
on the roles of deformation and fluid during rejuvenation of a polymetamorphic terrane: inferences on the geodynamic evolution of the ruker province, east antarctica |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1525-1314.2007.00732.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.2007.00732.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.2007.00732.x |
long_lat |
ENVELOPE(64.583,64.583,-73.583,-73.583) |
geographic |
East Antarctica Ruker |
geographic_facet |
East Antarctica Ruker |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Journal of Metamorphic Geology volume 25, issue 8, page 855-871 ISSN 0263-4929 1525-1314 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1525-1314.2007.00732.x |
container_title |
Journal of Metamorphic Geology |
container_volume |
25 |
container_issue |
8 |
container_start_page |
855 |
op_container_end_page |
871 |
_version_ |
1800741608630517760 |