U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane
The Grove Mountains, 400 km south of the Chinese Antarctic Zhongshan Station, are an inland continuation of the Pan-African-aged (i.e., Late Neoproterozoic/Cambrian) Prydz Belt, East Antarctica. In this paper we carried out a combined U-Th-Pb monazite and Sm-Nd mineral-whole-rock dating on para- and...
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ftarcticportal:oai:generic.eprints.org:2657 2023-12-03T10:08:34+01:00 U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane Xiaochun, Liu Xiaoxiao, Ling Bor-ming, Jahn 2018-06 application/pdf http://library.arcticportal.org/2657/ http://library.arcticportal.org/2657/1/A1802004.pdf en eng Polar Research Institute of China - PRIC http://library.arcticportal.org/2657/1/A1802004.pdf Xiaochun, Liu and Xiaoxiao, Ling and Bor-ming, Jahn (2018) U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane. Advances in Polar Science, 29 (2). pp. 108-117. Terrestrial Article PeerReviewed 2018 ftarcticportal 2023-11-08T23:54:41Z The Grove Mountains, 400 km south of the Chinese Antarctic Zhongshan Station, are an inland continuation of the Pan-African-aged (i.e., Late Neoproterozoic/Cambrian) Prydz Belt, East Antarctica. In this paper we carried out a combined U-Th-Pb monazite and Sm-Nd mineral-whole-rock dating on para- and orthogneisses from bedrock in the Grove Mountains. U-Th-Pb monazite dating of a cordierite-bearing pelitic paragneiss yields ages of 523 4 Ma for the cores and 508 6 Ma for the rims. Sm-Nd mineral-whole-rock isotopic analyses yield isochron ages of 536 3 Ma for a coarse-grained felsic orthogneiss and 507 30 Ma for a fine-grained quartzofeldspathic paragneiss. Combined with previously published age data in the Grove Mountains and adjacent areas, the older age of ~530 Ma is interpreted as the time of regional medium- to low-pressure granulite-facies metamorphism, and the younger age of ~510 Ma as the cooling age of the granulite terrane. The absence of evidence for a Grenville-aged (i.e., Late Mesoproterozoic/Early Neoproterozoic) metamorphic event indicates that the Grove Mountains have experienced only a single metamorphic cycle, i.e., Pan-African-aged, which distinguishes them from other polymetamorphic terranes in the Prydz Belt. This will provide important constraints on the controversial nature of the Prydz Belt. Article in Journal/Newspaper Advances in Polar Science Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science Arctic Portal Library Antarctic East Antarctica Zhongshan ENVELOPE(76.371,76.371,-69.373,-69.373) Zhongshan Station ENVELOPE(76.371,76.371,-69.373,-69.373) Grove Mountains ENVELOPE(75.000,75.000,-72.750,-72.750) |
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Open Polar |
collection |
Arctic Portal Library |
op_collection_id |
ftarcticportal |
language |
English |
topic |
Terrestrial |
spellingShingle |
Terrestrial Xiaochun, Liu Xiaoxiao, Ling Bor-ming, Jahn U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
topic_facet |
Terrestrial |
description |
The Grove Mountains, 400 km south of the Chinese Antarctic Zhongshan Station, are an inland continuation of the Pan-African-aged (i.e., Late Neoproterozoic/Cambrian) Prydz Belt, East Antarctica. In this paper we carried out a combined U-Th-Pb monazite and Sm-Nd mineral-whole-rock dating on para- and orthogneisses from bedrock in the Grove Mountains. U-Th-Pb monazite dating of a cordierite-bearing pelitic paragneiss yields ages of 523 4 Ma for the cores and 508 6 Ma for the rims. Sm-Nd mineral-whole-rock isotopic analyses yield isochron ages of 536 3 Ma for a coarse-grained felsic orthogneiss and 507 30 Ma for a fine-grained quartzofeldspathic paragneiss. Combined with previously published age data in the Grove Mountains and adjacent areas, the older age of ~530 Ma is interpreted as the time of regional medium- to low-pressure granulite-facies metamorphism, and the younger age of ~510 Ma as the cooling age of the granulite terrane. The absence of evidence for a Grenville-aged (i.e., Late Mesoproterozoic/Early Neoproterozoic) metamorphic event indicates that the Grove Mountains have experienced only a single metamorphic cycle, i.e., Pan-African-aged, which distinguishes them from other polymetamorphic terranes in the Prydz Belt. This will provide important constraints on the controversial nature of the Prydz Belt. |
format |
Article in Journal/Newspaper |
author |
Xiaochun, Liu Xiaoxiao, Ling Bor-ming, Jahn |
author_facet |
Xiaochun, Liu Xiaoxiao, Ling Bor-ming, Jahn |
author_sort |
Xiaochun, Liu |
title |
U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
title_short |
U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
title_full |
U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
title_fullStr |
U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
title_full_unstemmed |
U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane |
title_sort |
u-th-pb monazite and sm-nd dating of high-grade rocks from the grove mountains, east antarctica: further evidence for a pan-african-aged monometamorphic terrane |
publisher |
Polar Research Institute of China - PRIC |
publishDate |
2018 |
url |
http://library.arcticportal.org/2657/ http://library.arcticportal.org/2657/1/A1802004.pdf |
long_lat |
ENVELOPE(76.371,76.371,-69.373,-69.373) ENVELOPE(76.371,76.371,-69.373,-69.373) ENVELOPE(75.000,75.000,-72.750,-72.750) |
geographic |
Antarctic East Antarctica Zhongshan Zhongshan Station Grove Mountains |
geographic_facet |
Antarctic East Antarctica Zhongshan Zhongshan Station Grove Mountains |
genre |
Advances in Polar Science Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science |
genre_facet |
Advances in Polar Science Antarc* Antarctic Antarctica East Antarctica Polar Science Polar Science |
op_relation |
http://library.arcticportal.org/2657/1/A1802004.pdf Xiaochun, Liu and Xiaoxiao, Ling and Bor-ming, Jahn (2018) U-Th-Pb monazite and Sm-Nd dating of high-grade rocks from the Grove Mountains, East Antarctica: further evidence for a Pan-African-aged monometamorphic terrane. Advances in Polar Science, 29 (2). pp. 108-117. |
_version_ |
1784254811302002688 |