Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica
The Larsemann Hills are located on the eastern coast of the Prydz Bay in East Antarctica. Based on large-scale geological mapping, metamorphic complex in the Larsemann Hills was found to be layered orderly in general, and therefore, the Larsemann Group is established. The Larsemann Group is subdivid...
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2021
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ftdoajarticles:oai:doaj.org/article:a4b81b26f85647279469a8329ebd0ff3 2023-05-15T13:56:54+02:00 Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica HU Jianmin WANG Wei ZHAO Yue LIU Xiaochun CHEN Hong DONG Xiaopeng 2021-10-01T00:00:00Z https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/article/a4b81b26f85647279469a8329ebd0ff3 ZH chi Institute of Geomechanics, Chinese Academy of Geological Sciences https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/article/a4b81b26f85647279469a8329ebd0ff3 Dizhi lixue xuebao, Vol 27, Iss 5, Pp 719-735 (2021) east antarctica larsemann hills larsemann group tectonic deformation tectonic framework Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.059 2023-02-26T01:33:39Z The Larsemann Hills are located on the eastern coast of the Prydz Bay in East Antarctica. Based on large-scale geological mapping, metamorphic complex in the Larsemann Hills was found to be layered orderly in general, and therefore, the Larsemann Group is established. The Larsemann Group is subdivided into 6 rock formations, and the protolith formation age is the Mesoproterozoic. The group has experienced the superposition of the Grenvillian and Pan-African metamorphism, and the metamorphic grade reached upper amphibolite facies to granulite facies. The main structural line in the Larsemann Hills is in the NEE-SWW strain, which generally constitutes a synclinorum structure verging to NEE. The distribution of several rock formations also shows the gradually younging from east to west. The NNW-SSE deformation of the structural line is obviously superimposed on the eastern Mirror Peninsula. The study shows that the Larsemann Group has suffered 6 periods of deformation, including the early Neoproterozoic Grenvillian period (D1), the late Neoproterozoic to early Paleozoic Pan-African periods (D2, D3, D4 and D5) and the Meso-Cenozoic extension (D6). The foliations presented in the rocks are actually the composite foliations of both the Grenvillian and Pan-African events, and the Pan-African event is demonstrated stronger than the Grenvillian event, which is rarely preserved in the gneisses. Constrained with both the metamorphic age of the Larsemann Group and the intrusion time of the Progress granite, it is believed that the D2~D5 deformations occurred during the span of 550~500 Ma. Thus, both the metamorphism and deformation features of rocks from the Larsemann Hills show that the Mesoproterozoic Larsemann Group have witnessed two orogenies of Grenvillian and Pan-African periods, respectively, and the breakup of the Gondwana. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Prydz Bay Directory of Open Access Journals: DOAJ Articles East Antarctica Larsemann Hills ENVELOPE(76.217,76.217,-69.400,-69.400) Prydz Bay |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Chinese |
topic |
east antarctica larsemann hills larsemann group tectonic deformation tectonic framework Geology QE1-996.5 |
spellingShingle |
east antarctica larsemann hills larsemann group tectonic deformation tectonic framework Geology QE1-996.5 HU Jianmin WANG Wei ZHAO Yue LIU Xiaochun CHEN Hong DONG Xiaopeng Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
topic_facet |
east antarctica larsemann hills larsemann group tectonic deformation tectonic framework Geology QE1-996.5 |
description |
The Larsemann Hills are located on the eastern coast of the Prydz Bay in East Antarctica. Based on large-scale geological mapping, metamorphic complex in the Larsemann Hills was found to be layered orderly in general, and therefore, the Larsemann Group is established. The Larsemann Group is subdivided into 6 rock formations, and the protolith formation age is the Mesoproterozoic. The group has experienced the superposition of the Grenvillian and Pan-African metamorphism, and the metamorphic grade reached upper amphibolite facies to granulite facies. The main structural line in the Larsemann Hills is in the NEE-SWW strain, which generally constitutes a synclinorum structure verging to NEE. The distribution of several rock formations also shows the gradually younging from east to west. The NNW-SSE deformation of the structural line is obviously superimposed on the eastern Mirror Peninsula. The study shows that the Larsemann Group has suffered 6 periods of deformation, including the early Neoproterozoic Grenvillian period (D1), the late Neoproterozoic to early Paleozoic Pan-African periods (D2, D3, D4 and D5) and the Meso-Cenozoic extension (D6). The foliations presented in the rocks are actually the composite foliations of both the Grenvillian and Pan-African events, and the Pan-African event is demonstrated stronger than the Grenvillian event, which is rarely preserved in the gneisses. Constrained with both the metamorphic age of the Larsemann Group and the intrusion time of the Progress granite, it is believed that the D2~D5 deformations occurred during the span of 550~500 Ma. Thus, both the metamorphism and deformation features of rocks from the Larsemann Hills show that the Mesoproterozoic Larsemann Group have witnessed two orogenies of Grenvillian and Pan-African periods, respectively, and the breakup of the Gondwana. |
format |
Article in Journal/Newspaper |
author |
HU Jianmin WANG Wei ZHAO Yue LIU Xiaochun CHEN Hong DONG Xiaopeng |
author_facet |
HU Jianmin WANG Wei ZHAO Yue LIU Xiaochun CHEN Hong DONG Xiaopeng |
author_sort |
HU Jianmin |
title |
Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
title_short |
Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
title_full |
Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
title_fullStr |
Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
title_full_unstemmed |
Sequence and tectonic deformation process of metamorphic complex in the Larsemann Hills, East Antarctica |
title_sort |
sequence and tectonic deformation process of metamorphic complex in the larsemann hills, east antarctica |
publisher |
Institute of Geomechanics, Chinese Academy of Geological Sciences |
publishDate |
2021 |
url |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/article/a4b81b26f85647279469a8329ebd0ff3 |
long_lat |
ENVELOPE(76.217,76.217,-69.400,-69.400) |
geographic |
East Antarctica Larsemann Hills Prydz Bay |
geographic_facet |
East Antarctica Larsemann Hills Prydz Bay |
genre |
Antarc* Antarctica East Antarctica Prydz Bay |
genre_facet |
Antarc* Antarctica East Antarctica Prydz Bay |
op_source |
Dizhi lixue xuebao, Vol 27, Iss 5, Pp 719-735 (2021) |
op_relation |
https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/toc/1006-6616 1006-6616 doi:10.12090/j.issn.1006-6616.2021.27.05.059 https://doaj.org/article/a4b81b26f85647279469a8329ebd0ff3 |
op_doi |
https://doi.org/10.12090/j.issn.1006-6616.2021.27.05.059 |
_version_ |
1766264508081242112 |