Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland
The Thala Hills area occupies a key position in Gondwanaland reconstructions near the India–Sri Lanka–Antarctica junction. We present U–Pb zircon isotopic age determinations from SHRIMP II obtained on four granite gneiss samples. Three high-temperature tectonomagmatic episodes may be distinguished i...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3738332 https://figshare.com/collections/Refined_geological_history_of_the_polyphase_plutonometamorphic_complex_in_the_Thala_Hills_area_Enderby_Land_East_Antarctica_from_zircon_SHRIMP_dating_and_implications_for_Neoproterozoic_amalgamation_of_Gondwanaland/3738332 |
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ftdatacite:10.6084/m9.figshare.c.3738332 2023-05-15T13:42:13+02:00 Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland Mikhalsky, Evgeniy Krylov, Dmitry Nickolay Rodionov Presnyakov, Sergey Skublov, Sergey Myasnikov, Oleg 2017 https://dx.doi.org/10.6084/m9.figshare.c.3738332 https://figshare.com/collections/Refined_geological_history_of_the_polyphase_plutonometamorphic_complex_in_the_Thala_Hills_area_Enderby_Land_East_Antarctica_from_zircon_SHRIMP_dating_and_implications_for_Neoproterozoic_amalgamation_of_Gondwanaland/3738332 unknown Figshare https://dx.doi.org/10.1144/sp457.2 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3738332 https://doi.org/10.1144/sp457.2 2021-11-05T12:55:41Z The Thala Hills area occupies a key position in Gondwanaland reconstructions near the India–Sri Lanka–Antarctica junction. We present U–Pb zircon isotopic age determinations from SHRIMP II obtained on four granite gneiss samples. Three high-temperature tectonomagmatic episodes may be distinguished in the study area at c . 980–970, c . 780–720 and c . 545–530 Ma. The c . 980–970 Ma event corresponds to the Rayner Structural Episode that affected East Antarctica, including the Sør Rondane Mountains to the west and Kemp Land to the east. The c . 780–720 Ma episode included two events at approximately 780 Ma (high-grade anatexis) and 720 Ma (syntectonic granitoid emplacement), and was roughly coeval with tectonomagmatic events in Dronning Maud Land of East Antarctica, as well as in other Gondwanaland regions, such as Madagascar, Sri Lanka and eastern Africa. The c . 780–720 Ma episode may be correlated with the East African Orogeny. These correlations argue for a similar geological evolution and conjugate position for Dronning Maud Land and Enderby Land despite a postulated Cambrian Lüctzow–Holm Bay suture separating them. The Cambrian ( c . 545–530 Ma) episode was manifested by high-grade anatexis that confirms previously identified late Neoproterozoic–Cambrian tectonothermal activities in the study area. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Enderby Land Kemp Land DataCite Metadata Store (German National Library of Science and Technology) Dronning Maud Land East Antarctica Kemp Land ENVELOPE(57.500,57.500,-67.500,-67.500) Rayner ENVELOPE(-45.166,-45.166,-60.650,-60.650) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Thala Hills ENVELOPE(46.000,46.000,-67.667,-67.667) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Mikhalsky, Evgeniy Krylov, Dmitry Nickolay Rodionov Presnyakov, Sergey Skublov, Sergey Myasnikov, Oleg Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The Thala Hills area occupies a key position in Gondwanaland reconstructions near the India–Sri Lanka–Antarctica junction. We present U–Pb zircon isotopic age determinations from SHRIMP II obtained on four granite gneiss samples. Three high-temperature tectonomagmatic episodes may be distinguished in the study area at c . 980–970, c . 780–720 and c . 545–530 Ma. The c . 980–970 Ma event corresponds to the Rayner Structural Episode that affected East Antarctica, including the Sør Rondane Mountains to the west and Kemp Land to the east. The c . 780–720 Ma episode included two events at approximately 780 Ma (high-grade anatexis) and 720 Ma (syntectonic granitoid emplacement), and was roughly coeval with tectonomagmatic events in Dronning Maud Land of East Antarctica, as well as in other Gondwanaland regions, such as Madagascar, Sri Lanka and eastern Africa. The c . 780–720 Ma episode may be correlated with the East African Orogeny. These correlations argue for a similar geological evolution and conjugate position for Dronning Maud Land and Enderby Land despite a postulated Cambrian Lüctzow–Holm Bay suture separating them. The Cambrian ( c . 545–530 Ma) episode was manifested by high-grade anatexis that confirms previously identified late Neoproterozoic–Cambrian tectonothermal activities in the study area. |
format |
Article in Journal/Newspaper |
author |
Mikhalsky, Evgeniy Krylov, Dmitry Nickolay Rodionov Presnyakov, Sergey Skublov, Sergey Myasnikov, Oleg |
author_facet |
Mikhalsky, Evgeniy Krylov, Dmitry Nickolay Rodionov Presnyakov, Sergey Skublov, Sergey Myasnikov, Oleg |
author_sort |
Mikhalsky, Evgeniy |
title |
Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
title_short |
Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
title_full |
Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
title_fullStr |
Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
title_full_unstemmed |
Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland |
title_sort |
refined geological history of the polyphase plutonometamorphic complex in the thala hills area (enderby land, east antarctica) from zircon shrimp dating and implications for neoproterozoic amalgamation of gondwanaland |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3738332 https://figshare.com/collections/Refined_geological_history_of_the_polyphase_plutonometamorphic_complex_in_the_Thala_Hills_area_Enderby_Land_East_Antarctica_from_zircon_SHRIMP_dating_and_implications_for_Neoproterozoic_amalgamation_of_Gondwanaland/3738332 |
long_lat |
ENVELOPE(57.500,57.500,-67.500,-67.500) ENVELOPE(-45.166,-45.166,-60.650,-60.650) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(46.000,46.000,-67.667,-67.667) |
geographic |
Dronning Maud Land East Antarctica Kemp Land Rayner Sør Rondane Mountains Sør-Rondane Thala Hills |
geographic_facet |
Dronning Maud Land East Antarctica Kemp Land Rayner Sør Rondane Mountains Sør-Rondane Thala Hills |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Enderby Land Kemp Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Enderby Land Kemp Land |
op_relation |
https://dx.doi.org/10.1144/sp457.2 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3738332 https://doi.org/10.1144/sp457.2 |
_version_ |
1766165535163154432 |