Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana
Lower Cretaceous volcanic lithic arenites, widely distributed in the Tethyan Himalaya, provide insights into the continental breakup of Eastern Gondwana. In southern Tibet they are represented by the Wölong Volcaniclastics. The volcanic rocks that contributed clastic material to the lower parts of t...
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/0bcfe443-2cc7-453d-84b1-260a7e635ee9 2024-06-23T07:47:53+00:00 Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana Hu, Xiumian Jansa, L. Chen, Lei Griffin, W. L. O'Reilly, S. Y. Wang, Jiangang 2010-01 https://researchers.mq.edu.au/en/publications/0bcfe443-2cc7-453d-84b1-260a7e635ee9 https://doi.org/10.1016/j.sedgeo.2009.11.008 http://www.scopus.com/inward/record.url?scp=75549083302&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Hu , X , Jansa , L , Chen , L , Griffin , W L , O'Reilly , S Y & Wang , J 2010 , ' Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya : implications for the final breakup of Eastern Gondwana ' , Sedimentary Geology , vol. 223 , no. 3-4 , pp. 193-205 . https://doi.org/10.1016/j.sedgeo.2009.11.008 article 2010 ftmacquarieunicr https://doi.org/10.1016/j.sedgeo.2009.11.008 2024-06-12T23:47:20Z Lower Cretaceous volcanic lithic arenites, widely distributed in the Tethyan Himalaya, provide insights into the continental breakup of Eastern Gondwana. In southern Tibet they are represented by the Wölong Volcaniclastics. The volcanic rocks that contributed clastic material to the lower parts of this unit were predominantly alkali basalts, whereas rhyolitic/dacitic volcanism becomes the predominant source of the upper strata. Geochemical analyses of basaltic grains and of detrital Cr-spinels from the Wölong Volcaniclastics demonstrate the alkaline character of the volcanism and suggest "within-plate" tectonic setting for the volcanism. Zircon U-Pb ages confirm that this volcanism continued from ~ 140 Ma to ~ 119 Ma. Hf-isotope data on these Early Cretaceous zircons indicate that their parental magmas were mantle-derived, but in the later stage of magmatic activity mantle-derived magmas were mixed with partial melts derived from the continental crust.The Lower Cretaceous volcaniclastics occur along a broad belt paralleling the northern margin of Greater India. The onset of volcaniclastic deposition in the Himalayas appears to become progressively younger toward the west, but it ended synchronously during the Late Albian (~ 102 Ma). The low volume of volcanic rocks and their intra-plate tectonic setting suggest that they are the result of decompressional melting along extensional deep-seated fractures cross-cutting the continental crust, and reflect changes in regional intra-plate tectonic stresses when Greater India began to separate from the Australia-Antarctica supercontinent. Article in Journal/Newspaper Antarc* Antarctica Macquarie University Research Portal Sedimentary Geology 223 3-4 193 205 |
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Macquarie University Research Portal |
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ftmacquarieunicr |
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English |
description |
Lower Cretaceous volcanic lithic arenites, widely distributed in the Tethyan Himalaya, provide insights into the continental breakup of Eastern Gondwana. In southern Tibet they are represented by the Wölong Volcaniclastics. The volcanic rocks that contributed clastic material to the lower parts of this unit were predominantly alkali basalts, whereas rhyolitic/dacitic volcanism becomes the predominant source of the upper strata. Geochemical analyses of basaltic grains and of detrital Cr-spinels from the Wölong Volcaniclastics demonstrate the alkaline character of the volcanism and suggest "within-plate" tectonic setting for the volcanism. Zircon U-Pb ages confirm that this volcanism continued from ~ 140 Ma to ~ 119 Ma. Hf-isotope data on these Early Cretaceous zircons indicate that their parental magmas were mantle-derived, but in the later stage of magmatic activity mantle-derived magmas were mixed with partial melts derived from the continental crust.The Lower Cretaceous volcaniclastics occur along a broad belt paralleling the northern margin of Greater India. The onset of volcaniclastic deposition in the Himalayas appears to become progressively younger toward the west, but it ended synchronously during the Late Albian (~ 102 Ma). The low volume of volcanic rocks and their intra-plate tectonic setting suggest that they are the result of decompressional melting along extensional deep-seated fractures cross-cutting the continental crust, and reflect changes in regional intra-plate tectonic stresses when Greater India began to separate from the Australia-Antarctica supercontinent. |
format |
Article in Journal/Newspaper |
author |
Hu, Xiumian Jansa, L. Chen, Lei Griffin, W. L. O'Reilly, S. Y. Wang, Jiangang |
spellingShingle |
Hu, Xiumian Jansa, L. Chen, Lei Griffin, W. L. O'Reilly, S. Y. Wang, Jiangang Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
author_facet |
Hu, Xiumian Jansa, L. Chen, Lei Griffin, W. L. O'Reilly, S. Y. Wang, Jiangang |
author_sort |
Hu, Xiumian |
title |
Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
title_short |
Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
title_full |
Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
title_fullStr |
Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
title_full_unstemmed |
Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya:implications for the final breakup of Eastern Gondwana |
title_sort |
provenance of lower cretaceous wölong volcaniclastics in the tibetan tethyan himalaya:implications for the final breakup of eastern gondwana |
publishDate |
2010 |
url |
https://researchers.mq.edu.au/en/publications/0bcfe443-2cc7-453d-84b1-260a7e635ee9 https://doi.org/10.1016/j.sedgeo.2009.11.008 http://www.scopus.com/inward/record.url?scp=75549083302&partnerID=8YFLogxK |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Hu , X , Jansa , L , Chen , L , Griffin , W L , O'Reilly , S Y & Wang , J 2010 , ' Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya : implications for the final breakup of Eastern Gondwana ' , Sedimentary Geology , vol. 223 , no. 3-4 , pp. 193-205 . https://doi.org/10.1016/j.sedgeo.2009.11.008 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.sedgeo.2009.11.008 |
container_title |
Sedimentary Geology |
container_volume |
223 |
container_issue |
3-4 |
container_start_page |
193 |
op_container_end_page |
205 |
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1802638101135228928 |