TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS
Charnockites from the Skallen area in the Lutzow-Holm Bay region of East Antarctica show carbonic fluid inclusions trapped within garnet, feldspar and quartz. Microthermometric and micro-Raman laser analyses characterize these fluids to be pure CO_2. With a maximum density of 1.05g/cm^3,these fluids...
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Department of Geosciences, Faculty of Science, Osaka City University:Centre for Earth Science Studies
1991
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ftnipr:oai:nipr.repo.nii.ac.jp:00002694 2023-05-15T13:49:00+02:00 TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS / ヨシダ マサル M. SANTOSH Masaru YOSHIDA 1991-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2694 http://id.nii.ac.jp/1291/00002694/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2694&item_no=1&attribute_id=18&file_no=1 en eng Department of Geosciences, Faculty of Science, Osaka City University:Centre for Earth Science Studies Department of Geosciences, Faculty of Science, Osaka City University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2694 http://id.nii.ac.jp/1291/00002694/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 5, 136-145(1991-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2694&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1991 ftnipr 2022-11-26T19:42:11Z Charnockites from the Skallen area in the Lutzow-Holm Bay region of East Antarctica show carbonic fluid inclusions trapped within garnet, feldspar and quartz. Microthermometric and micro-Raman laser analyses characterize these fluids to be pure CO_2. With a maximum density of 1.05g/cm^3,these fluids are inferred to represent the traces of the ambient fluid which effected the reduction of water activites and dehyrated large segments of the Gondwanian deep crust. A sympathetic decrease in the densities of carbonic fluids trapped within early to late crystallizing minerals is recorded. This defines an uplift path which crossed higher to lower density isochores, in close correspondence with the T-convex metamorphic P-T trajectory computed for this terrane from mineral phase equilibria constraints. We provide the first direct evidence for the infiltration of CO_2 in the East Antarctic granulites, a well established mechanism believed to have been instrumental in generating charnockites in the other Gondwana continents. Report Antarc* Antarctic Antarctica East Antarctica National Institute of Polar Research Repository, Japan Antarctic East Antarctica Skallen ENVELOPE(39.467,39.467,-69.650,-69.650) |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Charnockites from the Skallen area in the Lutzow-Holm Bay region of East Antarctica show carbonic fluid inclusions trapped within garnet, feldspar and quartz. Microthermometric and micro-Raman laser analyses characterize these fluids to be pure CO_2. With a maximum density of 1.05g/cm^3,these fluids are inferred to represent the traces of the ambient fluid which effected the reduction of water activites and dehyrated large segments of the Gondwanian deep crust. A sympathetic decrease in the densities of carbonic fluids trapped within early to late crystallizing minerals is recorded. This defines an uplift path which crossed higher to lower density isochores, in close correspondence with the T-convex metamorphic P-T trajectory computed for this terrane from mineral phase equilibria constraints. We provide the first direct evidence for the infiltration of CO_2 in the East Antarctic granulites, a well established mechanism believed to have been instrumental in generating charnockites in the other Gondwana continents. |
format |
Report |
author |
/ ヨシダ マサル M. SANTOSH Masaru YOSHIDA |
spellingShingle |
/ ヨシダ マサル M. SANTOSH Masaru YOSHIDA TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
author_facet |
/ ヨシダ マサル M. SANTOSH Masaru YOSHIDA |
author_sort |
/ ヨシダ マサル |
title |
TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
title_short |
TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
title_full |
TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
title_fullStr |
TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
title_full_unstemmed |
TRAPPED CARBON DIOXIDE IN EAST ANTARCTIC GRANULITES : EVIDENCE FROM FLUID INCLUSIONS |
title_sort |
trapped carbon dioxide in east antarctic granulites : evidence from fluid inclusions |
publisher |
Department of Geosciences, Faculty of Science, Osaka City University:Centre for Earth Science Studies |
publishDate |
1991 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2694 http://id.nii.ac.jp/1291/00002694/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2694&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(39.467,39.467,-69.650,-69.650) |
geographic |
Antarctic East Antarctica Skallen |
geographic_facet |
Antarctic East Antarctica Skallen |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2694 http://id.nii.ac.jp/1291/00002694/ AA1072335X Proceedings of the NIPR Symposium on Antarctic Geosciences, 5, 136-145(1991-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2694&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250298078134272 |