Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica
Extensive high-grade polydeformed metamorphic provinces surrounding Archaean cratonic nuclei in the East Antarctic Shield record two tectono-thermal episodes in late Mesoproterozoic and late Neoproterozoic-Cambrian times. In Western Dronning Maud Land, the high-grade Mesoproterozoic Maud Belt is jux...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.847094 2023-05-15T13:44:47+02:00 Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica Board, W S Frimmel, Hartwig E Armstrong, Robert A MEDIAN LATITUDE: -72.572381 * MEDIAN LONGITUDE: 0.379281 * SOUTH-BOUND LATITUDE: -72.653520 * WEST-BOUND LONGITUDE: 0.167880 * NORTH-BOUND LATITUDE: -72.507200 * EAST-BOUND LONGITUDE: 0.543180 2005-06-16 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.847094 https://doi.org/10.1594/PANGAEA.847094 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.847094 https://doi.org/10.1594/PANGAEA.847094 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Board, W S; Frimmel, Hartwig E; Armstrong, Robert A (2005): Pan-African tectonism in the western Maud Belt: P-T-t path for high-grade gneisses in the H.U. Sverdrupfjella, East Antarctica. Journal of Petrology, 46(4), 671-699, https://doi.org/10.1093/petrology/egh093 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.847094 https://doi.org/10.1093/petrology/egh093 2023-01-20T07:33:28Z Extensive high-grade polydeformed metamorphic provinces surrounding Archaean cratonic nuclei in the East Antarctic Shield record two tectono-thermal episodes in late Mesoproterozoic and late Neoproterozoic-Cambrian times. In Western Dronning Maud Land, the high-grade Mesoproterozoic Maud Belt is juxtaposed against the Archaean Grunehogna Province and has traditionally been interpreted as a Grenvillian mobile belt that was thermally overprinted during the Early Palaeozoic. Integration of new U-Pb sensitive high-resolution ion microprobe and conventional single zircon and monazite age data, and Ar-Ar data on hornblende and biotite, with thermobarometric calculations on rocks from the H.U. Sverdrupfjella, northern Maud Belt, resulted in a more complex P-T-t evolution than previously assumed. A c. 540 Ma monazite, hosted by an upper ampibolite-facies mineral assemblage defining a regionally dominant top-to-NW shear fabric, provides strong evidence for the penetrative deformation in the area being of Pan-African age and not of Grenvillian age as previously reported. Relics of an eclogite-facies garnet-omphacite assemblage within strain-protected mafic boudins indicate that the peak metamorphic conditions recorded by most rocks in the area (T = 687-758°C, P = 9·4-11·3 kbar) were attained subsequent to decompression from P > 12·9 kbar. By analogy with limited U-Pb single zircon age data and on circumstantial textural grounds, this earlier eclogite-facies metamorphism is ascribed to subduction and accretion around 565 Ma. Post-peak metamorphic K-metasomatism under amphibolite-facies conditions is ascribed to the intrusion of post-orogenic granite at c. 480 Ma. The recognition of extensive Pan-African tectonism in the Maud Belt casts doubts on previous Rodinia reconstructions, in which this belt takes a pivotal position between East Antarctica, the Kalahari Craton and Laurentia. Evidence of late Mesoproterozoic high-grade metamorphism during the formation of the Maud Belt exists in the form of c. 1035 Ma zircon ... Dataset Antarc* Antarctic Antarctica Antarctica Journal Arctic Dronning Maud Land East Antarctica Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Arctic Dronning Maud Land East Antarctica Grunehogna ENVELOPE(-2.750,-2.750,-72.033,-72.033) Sverdrupfjella ENVELOPE(0.583,0.583,-72.700,-72.700) ENVELOPE(0.167880,0.543180,-72.507200,-72.653520) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 |
spellingShingle |
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Board, W S Frimmel, Hartwig E Armstrong, Robert A Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
topic_facet |
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 |
description |
Extensive high-grade polydeformed metamorphic provinces surrounding Archaean cratonic nuclei in the East Antarctic Shield record two tectono-thermal episodes in late Mesoproterozoic and late Neoproterozoic-Cambrian times. In Western Dronning Maud Land, the high-grade Mesoproterozoic Maud Belt is juxtaposed against the Archaean Grunehogna Province and has traditionally been interpreted as a Grenvillian mobile belt that was thermally overprinted during the Early Palaeozoic. Integration of new U-Pb sensitive high-resolution ion microprobe and conventional single zircon and monazite age data, and Ar-Ar data on hornblende and biotite, with thermobarometric calculations on rocks from the H.U. Sverdrupfjella, northern Maud Belt, resulted in a more complex P-T-t evolution than previously assumed. A c. 540 Ma monazite, hosted by an upper ampibolite-facies mineral assemblage defining a regionally dominant top-to-NW shear fabric, provides strong evidence for the penetrative deformation in the area being of Pan-African age and not of Grenvillian age as previously reported. Relics of an eclogite-facies garnet-omphacite assemblage within strain-protected mafic boudins indicate that the peak metamorphic conditions recorded by most rocks in the area (T = 687-758°C, P = 9·4-11·3 kbar) were attained subsequent to decompression from P > 12·9 kbar. By analogy with limited U-Pb single zircon age data and on circumstantial textural grounds, this earlier eclogite-facies metamorphism is ascribed to subduction and accretion around 565 Ma. Post-peak metamorphic K-metasomatism under amphibolite-facies conditions is ascribed to the intrusion of post-orogenic granite at c. 480 Ma. The recognition of extensive Pan-African tectonism in the Maud Belt casts doubts on previous Rodinia reconstructions, in which this belt takes a pivotal position between East Antarctica, the Kalahari Craton and Laurentia. Evidence of late Mesoproterozoic high-grade metamorphism during the formation of the Maud Belt exists in the form of c. 1035 Ma zircon ... |
format |
Dataset |
author |
Board, W S Frimmel, Hartwig E Armstrong, Robert A |
author_facet |
Board, W S Frimmel, Hartwig E Armstrong, Robert A |
author_sort |
Board, W S |
title |
Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
title_short |
Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
title_full |
Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
title_fullStr |
Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
title_full_unstemmed |
Representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from Sverdrupfjella, East Antarctica |
title_sort |
representative analyses of pre-tectonic metabasic rocks and metapelitic gneiss from sverdrupfjella, east antarctica |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.847094 https://doi.org/10.1594/PANGAEA.847094 |
op_coverage |
MEDIAN LATITUDE: -72.572381 * MEDIAN LONGITUDE: 0.379281 * SOUTH-BOUND LATITUDE: -72.653520 * WEST-BOUND LONGITUDE: 0.167880 * NORTH-BOUND LATITUDE: -72.507200 * EAST-BOUND LONGITUDE: 0.543180 |
long_lat |
ENVELOPE(-2.750,-2.750,-72.033,-72.033) ENVELOPE(0.583,0.583,-72.700,-72.700) ENVELOPE(0.167880,0.543180,-72.507200,-72.653520) |
geographic |
Antarctic Arctic Dronning Maud Land East Antarctica Grunehogna Sverdrupfjella |
geographic_facet |
Antarctic Arctic Dronning Maud Land East Antarctica Grunehogna Sverdrupfjella |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Arctic Dronning Maud Land East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Arctic Dronning Maud Land East Antarctica Sea ice |
op_source |
Supplement to: Board, W S; Frimmel, Hartwig E; Armstrong, Robert A (2005): Pan-African tectonism in the western Maud Belt: P-T-t path for high-grade gneisses in the H.U. Sverdrupfjella, East Antarctica. Journal of Petrology, 46(4), 671-699, https://doi.org/10.1093/petrology/egh093 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.847094 https://doi.org/10.1594/PANGAEA.847094 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.847094 https://doi.org/10.1093/petrology/egh093 |
_version_ |
1766206243824730112 |