Thermometry of diogenites
Mg-Fe^<2+> exchange reaction between orthopyroxene and spinel has been calibrated thermodynamically and empirically and applied to the thermometry of diogenites. Based on regression of the orthopyroxene-spinel Mg-Fe^<2+> distribution coefficients against the Cr-mole fractions of the spin...
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Department of Geology and Geophysics, Indian Institute of Technology/Department of Geology and Geophysics, Indian Institute of Technology
1987
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ftnipr:oai:nipr.repo.nii.ac.jp:00002134 2023-05-15T17:10:59+02:00 Thermometry of diogenites Mukherjee,Amalbikash Viswanath,T.A. 1987-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2134 http://id.nii.ac.jp/1291/00002134/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2134&item_no=1&attribute_id=18&file_no=1 en eng Department of Geology and Geophysics, Indian Institute of Technology/Department of Geology and Geophysics, Indian Institute of Technology https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2134 http://id.nii.ac.jp/1291/00002134/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 46, 205-215(1987-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2134&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1987 ftnipr 2022-11-12T19:42:57Z Mg-Fe^<2+> exchange reaction between orthopyroxene and spinel has been calibrated thermodynamically and empirically and applied to the thermometry of diogenites. Based on regression of the orthopyroxene-spinel Mg-Fe^<2+> distribution coefficients against the Cr-mole fractions of the spinel of a number of naturally and experimentally equilibrated samples, the empirical calibration is more successful, gives internally consistent results and agrees well with independent temperature estimates of a wide range of terrestrial test samples. Uncertainty of the empirically determined temperatures, however, increases with decreasing Mg-Fe^<2+> distribution coefficient between orthopyroxene and spinel and increasing Cr-content of the spinel. Applied to a number of diogenites, the empirical calibration gives moderately high temperatures (687 and 885℃) for the Johnstown and Yamato-75032 diogenites and very high temperatures (between 1512 and 1941℃) for Y-692,-74013 and -74136 diogenites. The Johnstown and Y-75032 diogenites possibly represent thermally equilibrated orthopyroxene-spinel assemblages comparable to slowly cooled terrestrial ultramafic plutonic bodies broadly in the 700-900℃ temperature regime. The higher temperature Yamato group on the other hand appears to be disequilibrium assemblages, affected by shock-reheating, partial melting and recrystallization. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Mg-Fe^<2+> exchange reaction between orthopyroxene and spinel has been calibrated thermodynamically and empirically and applied to the thermometry of diogenites. Based on regression of the orthopyroxene-spinel Mg-Fe^<2+> distribution coefficients against the Cr-mole fractions of the spinel of a number of naturally and experimentally equilibrated samples, the empirical calibration is more successful, gives internally consistent results and agrees well with independent temperature estimates of a wide range of terrestrial test samples. Uncertainty of the empirically determined temperatures, however, increases with decreasing Mg-Fe^<2+> distribution coefficient between orthopyroxene and spinel and increasing Cr-content of the spinel. Applied to a number of diogenites, the empirical calibration gives moderately high temperatures (687 and 885℃) for the Johnstown and Yamato-75032 diogenites and very high temperatures (between 1512 and 1941℃) for Y-692,-74013 and -74136 diogenites. The Johnstown and Y-75032 diogenites possibly represent thermally equilibrated orthopyroxene-spinel assemblages comparable to slowly cooled terrestrial ultramafic plutonic bodies broadly in the 700-900℃ temperature regime. The higher temperature Yamato group on the other hand appears to be disequilibrium assemblages, affected by shock-reheating, partial melting and recrystallization. |
format |
Report |
author |
Mukherjee,Amalbikash Viswanath,T.A. |
spellingShingle |
Mukherjee,Amalbikash Viswanath,T.A. Thermometry of diogenites |
author_facet |
Mukherjee,Amalbikash Viswanath,T.A. |
author_sort |
Mukherjee,Amalbikash |
title |
Thermometry of diogenites |
title_short |
Thermometry of diogenites |
title_full |
Thermometry of diogenites |
title_fullStr |
Thermometry of diogenites |
title_full_unstemmed |
Thermometry of diogenites |
title_sort |
thermometry of diogenites |
publisher |
Department of Geology and Geophysics, Indian Institute of Technology/Department of Geology and Geophysics, Indian Institute of Technology |
publishDate |
1987 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2134 http://id.nii.ac.jp/1291/00002134/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2134&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Yamato |
geographic_facet |
Yamato |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2134 http://id.nii.ac.jp/1291/00002134/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 46, 205-215(1987-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2134&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067794902777856 |