Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica
George V Land (Antarctica) includes the boundary between Late Archean-Paleoproterozoic metamorphic terrains of the East Antarctic craton and the intrusive and metasedimentary rocks of the Early Paleozoic Ross-Delamerian Orogen. This therefore represents a key region for understanding the tectono-met...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.847466 2024-09-15T17:42:50+00:00 Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica Di Vincenzo, Gianfranco Talarico, Franco M Kleinschmidt, Georg MEDIAN LATITUDE: -67.640958 * MEDIAN LONGITUDE: 146.319953 * SOUTH-BOUND LATITUDE: -68.395000 * WEST-BOUND LONGITUDE: 143.841000 * NORTH-BOUND LATITUDE: -66.928000 * EAST-BOUND LONGITUDE: 149.769000 2007 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.847466 https://doi.org/10.1594/PANGAEA.847466 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.847466 https://doi.org/10.1594/PANGAEA.847466 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Di Vincenzo, Gianfranco; Talarico, Franco M; Kleinschmidt, Georg (2007): An 40Ar-39Ar investigation of the Mertz Glacier area (George V Land, Antarctica): Implications for the Ross Orogen–East Antarctic Craton relationship and Gondwana reconstructions. Precambrian Research, 152(3-4), 93-118, https://doi.org/10.1016/j.precamres.2006.10.002 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 dataset publication series 2007 ftpangaea https://doi.org/10.1594/PANGAEA.84746610.1016/j.precamres.2006.10.002 2024-07-24T02:31:21Z George V Land (Antarctica) includes the boundary between Late Archean-Paleoproterozoic metamorphic terrains of the East Antarctic craton and the intrusive and metasedimentary rocks of the Early Paleozoic Ross-Delamerian Orogen. This therefore represents a key region for understanding the tectono-metamorphic evolution of the East Antarctic Craton and the Ross Orogen and for defining their structural relationship in East Antarctica, with potential implications for Gondwana reconstructions. In the East Antarctic Craton the outcrops closest to the Ross orogenic belt form the Mertz Shear Zone, a prominent ductile shear zone up to 5 km wide. Its deformation fabric includes a series of progressive, overprinting shear structures developed under different metamorphic conditions: from an early medium-P granulite-facies metamorphism, through amphibolite-facies to late greenschist-facies conditions. 40Ar-39Ar laserprobe data on biotite in mylonitic rocks from the Mertz Shear Zone indicate that the minimum age for ductile deformation under greenschist-facies conditions is 1502 ± 9 Ma and reveal no evidence of reactivation processes linked to the Ross Orogeny. 40Ar-39Ar laserprobe data on amphibole, although plagued by excess argon, suggest the presence of a ~1.7 Ga old phase of regional-scale retrogression under amphibolite-facies conditions. Results support the correlation between the East Antarctic Craton in the Mertz Glacier area and the Sleaford Complex of the Gawler Craton in southern Australia, and suggest that the Mertz Shear Zone may be considered a correlative of the Kalinjala Shear Zone. An erratic immature metasandstone collected east of Ninnis Glacier (~180 km east of the Mertz Glacier) and petrographically similar to metasedimentary rocks enclosed as xenoliths in Cambro-Ordovician granites cropping out along the western side of Ninnis Glacier, yielded detrital white-mica 40Ar-39Ar ages from ~530 to 640 Ma and a minimum age of 518 ± 5 Ma. This pattern compares remarkably well with those previously obtained for ... Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica George V Land Mertz Glacier Ninnis Glacier Sea ice PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(143.841000,149.769000,-66.928000,-68.395000) |
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 Di Vincenzo, Gianfranco Talarico, Franco M Kleinschmidt, Georg Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
topic_facet |
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 |
description |
George V Land (Antarctica) includes the boundary between Late Archean-Paleoproterozoic metamorphic terrains of the East Antarctic craton and the intrusive and metasedimentary rocks of the Early Paleozoic Ross-Delamerian Orogen. This therefore represents a key region for understanding the tectono-metamorphic evolution of the East Antarctic Craton and the Ross Orogen and for defining their structural relationship in East Antarctica, with potential implications for Gondwana reconstructions. In the East Antarctic Craton the outcrops closest to the Ross orogenic belt form the Mertz Shear Zone, a prominent ductile shear zone up to 5 km wide. Its deformation fabric includes a series of progressive, overprinting shear structures developed under different metamorphic conditions: from an early medium-P granulite-facies metamorphism, through amphibolite-facies to late greenschist-facies conditions. 40Ar-39Ar laserprobe data on biotite in mylonitic rocks from the Mertz Shear Zone indicate that the minimum age for ductile deformation under greenschist-facies conditions is 1502 ± 9 Ma and reveal no evidence of reactivation processes linked to the Ross Orogeny. 40Ar-39Ar laserprobe data on amphibole, although plagued by excess argon, suggest the presence of a ~1.7 Ga old phase of regional-scale retrogression under amphibolite-facies conditions. Results support the correlation between the East Antarctic Craton in the Mertz Glacier area and the Sleaford Complex of the Gawler Craton in southern Australia, and suggest that the Mertz Shear Zone may be considered a correlative of the Kalinjala Shear Zone. An erratic immature metasandstone collected east of Ninnis Glacier (~180 km east of the Mertz Glacier) and petrographically similar to metasedimentary rocks enclosed as xenoliths in Cambro-Ordovician granites cropping out along the western side of Ninnis Glacier, yielded detrital white-mica 40Ar-39Ar ages from ~530 to 640 Ma and a minimum age of 518 ± 5 Ma. This pattern compares remarkably well with those previously obtained for ... |
format |
Other/Unknown Material |
author |
Di Vincenzo, Gianfranco Talarico, Franco M Kleinschmidt, Georg |
author_facet |
Di Vincenzo, Gianfranco Talarico, Franco M Kleinschmidt, Georg |
author_sort |
Di Vincenzo, Gianfranco |
title |
Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
title_short |
Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
title_full |
Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
title_fullStr |
Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
title_full_unstemmed |
Mineral composition and 40Ar-39Ar data of samples from Garnet Point, Aurora Peak, Correll Nunatak, Penguin Point and Horn Bluffs, East Antarctica |
title_sort |
mineral composition and 40ar-39ar data of samples from garnet point, aurora peak, correll nunatak, penguin point and horn bluffs, east antarctica |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.847466 https://doi.org/10.1594/PANGAEA.847466 |
op_coverage |
MEDIAN LATITUDE: -67.640958 * MEDIAN LONGITUDE: 146.319953 * SOUTH-BOUND LATITUDE: -68.395000 * WEST-BOUND LONGITUDE: 143.841000 * NORTH-BOUND LATITUDE: -66.928000 * EAST-BOUND LONGITUDE: 149.769000 |
long_lat |
ENVELOPE(143.841000,149.769000,-66.928000,-68.395000) |
genre |
Antarc* Antarctic Antarctica East Antarctica George V Land Mertz Glacier Ninnis Glacier Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica George V Land Mertz Glacier Ninnis Glacier Sea ice |
op_source |
Supplement to: Di Vincenzo, Gianfranco; Talarico, Franco M; Kleinschmidt, Georg (2007): An 40Ar-39Ar investigation of the Mertz Glacier area (George V Land, Antarctica): Implications for the Ross Orogen–East Antarctic Craton relationship and Gondwana reconstructions. Precambrian Research, 152(3-4), 93-118, https://doi.org/10.1016/j.precamres.2006.10.002 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.847466 https://doi.org/10.1594/PANGAEA.847466 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.84746610.1016/j.precamres.2006.10.002 |
_version_ |
1810489612812943360 |