First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India
Abstract Mineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm—Nd and Rb—Sr ages of 517 ± 26 Ma and 484 ± 15 Ma respectively. The Nd model age calculated for the charnockite is c . 2100 Ma. Our study report...
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0016756800013583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800013583 |
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crcambridgeupr:10.1017/s0016756800013583 2024-03-03T08:38:35+00:00 First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India Unnikrishnan-Warrier, C. Santosh, M. Yoshida, M. 1995 http://dx.doi.org/10.1017/s0016756800013583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800013583 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 132, issue 3, page 253-260 ISSN 0016-7568 1469-5081 Geology journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0016756800013583 2024-02-08T08:31:01Z Abstract Mineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm—Nd and Rb—Sr ages of 517 ± 26 Ma and 484 ± 15 Ma respectively. The Nd model age calculated for the charnockite is c . 2100 Ma. Our study reports the first Pan-African mineral isochron ages from regional charnockites of Peninsular India, which are in good agreement with the recently obtained ages of incipient charnockites in the adjacent blocks, as well as alkaline plutons within the same block. Our results indicate that the Pan-African tectonothermal event in the granulite blocks south of the Palghat—Cauvery shear zone was regional, with terrain-wide rejuvenation. These results correlate with similar Pan-African tectono-thermal events reported from Sri Lanka and East Antarctica, and have an important bearing on Gondwana reconstructions. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Cambridge University Press East Antarctica Geological Magazine 132 3 253 260 |
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Cambridge University Press |
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English |
topic |
Geology |
spellingShingle |
Geology Unnikrishnan-Warrier, C. Santosh, M. Yoshida, M. First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
topic_facet |
Geology |
description |
Abstract Mineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm—Nd and Rb—Sr ages of 517 ± 26 Ma and 484 ± 15 Ma respectively. The Nd model age calculated for the charnockite is c . 2100 Ma. Our study reports the first Pan-African mineral isochron ages from regional charnockites of Peninsular India, which are in good agreement with the recently obtained ages of incipient charnockites in the adjacent blocks, as well as alkaline plutons within the same block. Our results indicate that the Pan-African tectonothermal event in the granulite blocks south of the Palghat—Cauvery shear zone was regional, with terrain-wide rejuvenation. These results correlate with similar Pan-African tectono-thermal events reported from Sri Lanka and East Antarctica, and have an important bearing on Gondwana reconstructions. |
format |
Article in Journal/Newspaper |
author |
Unnikrishnan-Warrier, C. Santosh, M. Yoshida, M. |
author_facet |
Unnikrishnan-Warrier, C. Santosh, M. Yoshida, M. |
author_sort |
Unnikrishnan-Warrier, C. |
title |
First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
title_short |
First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
title_full |
First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
title_fullStr |
First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
title_full_unstemmed |
First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India |
title_sort |
first report of pan-african sm—nd and rb—sr mineral isochron ages from regional charnockites of southern india |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0016756800013583 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800013583 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
Geological Magazine volume 132, issue 3, page 253-260 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756800013583 |
container_title |
Geological Magazine |
container_volume |
132 |
container_issue |
3 |
container_start_page |
253 |
op_container_end_page |
260 |
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1792506996760510464 |