Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana
The Grove Mountains are an inland continuation of the Late Neoproterozoic/Cambrian Prydz Belt of East Antarctica. In this paper we report high-pressure (HP) mafic granulites that occur in glacial moraines from this area. Petrographical textures, mineral compositions and P-T pseudosection calculation...
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Online Access: | https://hdl.handle.net/20.500.11897/246241 https://doi.org/10.1016/j.precamres.2009.07.001 |
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ftpekinguniv:oai:localhost:20.500.11897/246241 2023-05-15T13:22:10+02:00 Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana Liu, Xiaochun Hu, Jianmin Zhao, Yue Lou, Yuxing Wei, Chunjing Liu, Xiaohan Liu, XC (reprint author), Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China. Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China. Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China. Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China. 2009 https://hdl.handle.net/20.500.11897/246241 https://doi.org/10.1016/j.precamres.2009.07.001 en eng precambrian research PRECAMBRIAN RESEARCH.2009,174,(1-2),181-199. 939688 0301-9268 http://hdl.handle.net/20.500.11897/246241 doi:10.1016/j.precamres.2009.07.001 WOS:000271362800012 SCI East Antarctica Prydz Belt Late Neoproterozoic/Cambrian HP mafic granulite Collisional orogeny PRINCE-CHARLES MOUNTAINS MINERAL EQUILIBRIA CALCULATIONS ECLOGITE-FACIES METAMORPHISM AMERY ICE SHELF PRYDZ-BAY RAUER-GROUP LARSEMANN HILLS U-PB TECTONIC IMPLICATIONS SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 Journal 2009 ftpekinguniv https://doi.org/20.500.11897/246241 https://doi.org/10.1016/j.precamres.2009.07.001 2021-08-01T08:52:40Z The Grove Mountains are an inland continuation of the Late Neoproterozoic/Cambrian Prydz Belt of East Antarctica. In this paper we report high-pressure (HP) mafic granulites that occur in glacial moraines from this area. Petrographical textures, mineral compositions and P-T pseudosection calculations in the system NCFMASHTO (Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3) suggest that the HP mafic granulites record peak P-T conditions of 11.8-14.0 kbar and 770-840 degrees C. The post-peak evolution of these rocks involved near-isothermal decompression of ca. 6 kbar followed by a greenschist facies overprint. SHRIMP U-Pb zircon dating, coupled with the identification of mineral inclusion assemblage in zircons, reveals HP metamorphism occurred at ca. 545 Ma and subsequent retrograde reactions involving near-isothermal decompression at ca. 530 Ma. Garnet-clinopyroxene-whole-rock Sm-Nd isotopic analyses also yield Cambrian 'isochron' ages. This reflects collision at a convergent plate margin followed by extensional exhumation as the orogen collapsed during Late Neoproterozoic/Cambrian orogeny. Therefore, the occurrence of HP mafic granulites from the Grove Mountains provides evidence for a collisional tectonic setting for the Prydz Belt, which supports the notion that East Gondwana was not finally assembled until the Cambrian. (C) 2009 Elsevier B.V. All rights reserved. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000271362800012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Geosciences, Multidisciplinary SCI(E) 24 REVIEW 1-2 181-199 174 Journal/Newspaper Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Prince Charles Mountains Prydz Bay Peking University Institutional Repository (PKU IR) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) East Antarctica Grove Mountains ENVELOPE(75.000,75.000,-72.750,-72.750) Larsemann Hills ENVELOPE(76.217,76.217,-69.400,-69.400) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Prydz Bay Rauer Group ENVELOPE(77.833,77.833,-68.850,-68.850) Precambrian Research 174 1-2 181 199 |
institution |
Open Polar |
collection |
Peking University Institutional Repository (PKU IR) |
op_collection_id |
ftpekinguniv |
language |
English |
topic |
East Antarctica Prydz Belt Late Neoproterozoic/Cambrian HP mafic granulite Collisional orogeny PRINCE-CHARLES MOUNTAINS MINERAL EQUILIBRIA CALCULATIONS ECLOGITE-FACIES METAMORPHISM AMERY ICE SHELF PRYDZ-BAY RAUER-GROUP LARSEMANN HILLS U-PB TECTONIC IMPLICATIONS SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 |
spellingShingle |
East Antarctica Prydz Belt Late Neoproterozoic/Cambrian HP mafic granulite Collisional orogeny PRINCE-CHARLES MOUNTAINS MINERAL EQUILIBRIA CALCULATIONS ECLOGITE-FACIES METAMORPHISM AMERY ICE SHELF PRYDZ-BAY RAUER-GROUP LARSEMANN HILLS U-PB TECTONIC IMPLICATIONS SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 Liu, Xiaochun Hu, Jianmin Zhao, Yue Lou, Yuxing Wei, Chunjing Liu, Xiaohan Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
topic_facet |
East Antarctica Prydz Belt Late Neoproterozoic/Cambrian HP mafic granulite Collisional orogeny PRINCE-CHARLES MOUNTAINS MINERAL EQUILIBRIA CALCULATIONS ECLOGITE-FACIES METAMORPHISM AMERY ICE SHELF PRYDZ-BAY RAUER-GROUP LARSEMANN HILLS U-PB TECTONIC IMPLICATIONS SYSTEM K2O-FEO-MGO-AL2O3-SIO2-H2O-TIO2-FE2O3 |
description |
The Grove Mountains are an inland continuation of the Late Neoproterozoic/Cambrian Prydz Belt of East Antarctica. In this paper we report high-pressure (HP) mafic granulites that occur in glacial moraines from this area. Petrographical textures, mineral compositions and P-T pseudosection calculations in the system NCFMASHTO (Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3) suggest that the HP mafic granulites record peak P-T conditions of 11.8-14.0 kbar and 770-840 degrees C. The post-peak evolution of these rocks involved near-isothermal decompression of ca. 6 kbar followed by a greenschist facies overprint. SHRIMP U-Pb zircon dating, coupled with the identification of mineral inclusion assemblage in zircons, reveals HP metamorphism occurred at ca. 545 Ma and subsequent retrograde reactions involving near-isothermal decompression at ca. 530 Ma. Garnet-clinopyroxene-whole-rock Sm-Nd isotopic analyses also yield Cambrian 'isochron' ages. This reflects collision at a convergent plate margin followed by extensional exhumation as the orogen collapsed during Late Neoproterozoic/Cambrian orogeny. Therefore, the occurrence of HP mafic granulites from the Grove Mountains provides evidence for a collisional tectonic setting for the Prydz Belt, which supports the notion that East Gondwana was not finally assembled until the Cambrian. (C) 2009 Elsevier B.V. All rights reserved. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000271362800012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Geosciences, Multidisciplinary SCI(E) 24 REVIEW 1-2 181-199 174 |
author2 |
Liu, XC (reprint author), Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China. Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China. Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China. Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China. |
format |
Journal/Newspaper |
author |
Liu, Xiaochun Hu, Jianmin Zhao, Yue Lou, Yuxing Wei, Chunjing Liu, Xiaohan |
author_facet |
Liu, Xiaochun Hu, Jianmin Zhao, Yue Lou, Yuxing Wei, Chunjing Liu, Xiaohan |
author_sort |
Liu, Xiaochun |
title |
Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
title_short |
Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
title_full |
Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
title_fullStr |
Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
title_full_unstemmed |
Late Neoproterozoic/Cambrian high-pressure mafic granulites from the Grove Mountains, East Antarctica: P-T-t path, collisional orogeny and implications for assembly of East Gondwana |
title_sort |
late neoproterozoic/cambrian high-pressure mafic granulites from the grove mountains, east antarctica: p-t-t path, collisional orogeny and implications for assembly of east gondwana |
publisher |
precambrian research |
publishDate |
2009 |
url |
https://hdl.handle.net/20.500.11897/246241 https://doi.org/10.1016/j.precamres.2009.07.001 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(75.000,75.000,-72.750,-72.750) ENVELOPE(76.217,76.217,-69.400,-69.400) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(77.833,77.833,-68.850,-68.850) |
geographic |
Amery Amery Ice Shelf East Antarctica Grove Mountains Larsemann Hills Prince Charles Mountains Prydz Bay Rauer Group |
geographic_facet |
Amery Amery Ice Shelf East Antarctica Grove Mountains Larsemann Hills Prince Charles Mountains Prydz Bay Rauer Group |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Prince Charles Mountains Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf Prince Charles Mountains Prydz Bay |
op_source |
SCI |
op_relation |
PRECAMBRIAN RESEARCH.2009,174,(1-2),181-199. 939688 0301-9268 http://hdl.handle.net/20.500.11897/246241 doi:10.1016/j.precamres.2009.07.001 WOS:000271362800012 |
op_doi |
https://doi.org/20.500.11897/246241 https://doi.org/10.1016/j.precamres.2009.07.001 |
container_title |
Precambrian Research |
container_volume |
174 |
container_issue |
1-2 |
container_start_page |
181 |
op_container_end_page |
199 |
_version_ |
1766363587296624640 |