The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana
Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/316252 2024-04-21T07:52:32+00:00 The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana DURGALAKSHMI, . Sajeev, K. Williams, Ian Reddy, D Harinadha Satish-Kumar, M. Jons, Niels Malaviarachchi, Sanjeewa P. K. Samuel, Vinod O George, PM application/pdf http://hdl.handle.net/1885/316252 https://doi.org/10.1093/petrology/egab068 https://openresearch-repository.anu.edu.au/bitstream/1885/316252/3/egab068.pdf.jpg en_AU eng Oxford University Press 0022-3530 http://hdl.handle.net/1885/316252 doi:10.1093/petrology/egab068 https://openresearch-repository.anu.edu.au/bitstream/1885/316252/3/egab068.pdf.jpg © The Author(s) 2021. Published by Oxford University Press. All rights reserved. Journal of Petrology ultrahigh-temperature metamorphism sapphirine–quartz SIMS U–Th–Pb ages pseudosection modelling eastern Gondwana Journal article ftanucanberra https://doi.org/10.1093/petrology/egab068 2024-03-27T00:30:48Z Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided. Article in Journal/Newspaper Antarc* Antarctica Australian National University: ANU Digital Collections Journal of Petrology 62 12 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
ultrahigh-temperature metamorphism sapphirine–quartz SIMS U–Th–Pb ages pseudosection modelling eastern Gondwana |
spellingShingle |
ultrahigh-temperature metamorphism sapphirine–quartz SIMS U–Th–Pb ages pseudosection modelling eastern Gondwana DURGALAKSHMI, . Sajeev, K. Williams, Ian Reddy, D Harinadha Satish-Kumar, M. Jons, Niels Malaviarachchi, Sanjeewa P. K. Samuel, Vinod O George, PM The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
topic_facet |
ultrahigh-temperature metamorphism sapphirine–quartz SIMS U–Th–Pb ages pseudosection modelling eastern Gondwana |
description |
Early Palaeozoic ultrahigh-Temperature (UHT) metamorphism in eastern Gondwana was an event that started with Gondwana amalgamation at c. 580Ma and lasted at least 50 Myr. Sapphirine quartz, Mg Al granulites preserve a record of the timing and duration of the event along the metamorphic belt. U Th Pb dating of zircon and monazite shows that metamorphism peaked almost simultaneously in Antarctica (554.064.7 Ma), Sri Lanka (555.564.6 Ma), southern India (548.168.1 Ma) and Madagascar (550.666.0 Ma), and ended in all locations at the same time, 530 520 Ma. Rare earth element (REE) compositions of the metamorphic zircon zones can be matched to the REE zoning in the associated garnet. Phase-diagram modelling indicates that the peak UHT P T conditions in Antarctica, Sri Lanka, and India were very similar, 1020 1040 _C at 0.8 GPa. Peak conditions in Madagascar were at higher T and similar P: 1090 _C and 0.8 GPa. The East African Orogeny before 600Ma preconditioned the crust of the eastern Gondwanan terranes by thickening it and harbouring heat-producing elements, heating the crust over c. 60 Myr; such that UHT conditions were reached when East and West Gondwana collided. |
format |
Article in Journal/Newspaper |
author |
DURGALAKSHMI, . Sajeev, K. Williams, Ian Reddy, D Harinadha Satish-Kumar, M. Jons, Niels Malaviarachchi, Sanjeewa P. K. Samuel, Vinod O George, PM |
author_facet |
DURGALAKSHMI, . Sajeev, K. Williams, Ian Reddy, D Harinadha Satish-Kumar, M. Jons, Niels Malaviarachchi, Sanjeewa P. K. Samuel, Vinod O George, PM |
author_sort |
DURGALAKSHMI, . |
title |
The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
title_short |
The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
title_full |
The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
title_fullStr |
The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
title_full_unstemmed |
The timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
title_sort |
timing, duration and conditions of uht metamorphism in remnants of the former eastern gondwana |
publisher |
Oxford University Press |
url |
http://hdl.handle.net/1885/316252 https://doi.org/10.1093/petrology/egab068 https://openresearch-repository.anu.edu.au/bitstream/1885/316252/3/egab068.pdf.jpg |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Journal of Petrology |
op_relation |
0022-3530 http://hdl.handle.net/1885/316252 doi:10.1093/petrology/egab068 https://openresearch-repository.anu.edu.au/bitstream/1885/316252/3/egab068.pdf.jpg |
op_rights |
© The Author(s) 2021. Published by Oxford University Press. All rights reserved. |
op_doi |
https://doi.org/10.1093/petrology/egab068 |
container_title |
Journal of Petrology |
container_volume |
62 |
container_issue |
12 |
_version_ |
1796935755281465344 |