Compositional comparisons of metamorphosed carbonaceous chondrites
Five carbonaceous chondrites (Allan Hills 82135,Coolidge, Karoonda, Pecora Escarpment 82500 and Yamato-693) thought to be metamorphosed chondrites of petrologic types 4 or 5 were analyzed by instrumental and radiochemical neutron activation analysis for 28 elements : Na, Mg, Al, K, Ca, Sc, V, Cr, Mn...
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Institute of Geophysics and Planetary Physics, University of California
1987
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ftnipr:oai:nipr.repo.nii.ac.jp:00002130 2023-05-15T17:10:59+02:00 Compositional comparisons of metamorphosed carbonaceous chondrites Gregory W. Kallemeyn 1987-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2130 http://id.nii.ac.jp/1291/00002130/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2130&item_no=1&attribute_id=18&file_no=1 en eng Institute of Geophysics and Planetary Physics, University of California https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2130 http://id.nii.ac.jp/1291/00002130/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 46, 151-161(1987-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2130&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1987 ftnipr 2022-11-12T19:42:57Z Five carbonaceous chondrites (Allan Hills 82135,Coolidge, Karoonda, Pecora Escarpment 82500 and Yamato-693) thought to be metamorphosed chondrites of petrologic types 4 or 5 were analyzed by instrumental and radiochemical neutron activation analysis for 28 elements : Na, Mg, Al, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, As, Se, Br, Ru, Cd, Sb, La, Sm, Eu, Yb, Lu, Os, Ir and Au. Coolidge and Y-693 are members of the CV clan based on refractory lithophile abundances. Coolidge has significantly depleted volatile element abundances relative to CV3 chondrites and is tentatively classified as CV4. Y-693 is compositionally indistinguishable from the oxidized subgroup CV3 chondrites, showing no significant depletion of volatile element abundances, in conflict with the petrographic data indicating type 5; the chondrite may be heterogeneous. Compositional and petrographic data for Karoonda and ALH82135 suggest they form a grouplet, part of a clan with refractory lithophile abundances intermediate between those of the CM-CO and CV clans. Compositional classification of the severely weathered PCA82500 is difficult because of the scatter of data. It is probably closely related to Karoonda and ALH82135. 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) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Pecora Escarpment ENVELOPE(-68.707,-68.707,-85.639,-85.639) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
Five carbonaceous chondrites (Allan Hills 82135,Coolidge, Karoonda, Pecora Escarpment 82500 and Yamato-693) thought to be metamorphosed chondrites of petrologic types 4 or 5 were analyzed by instrumental and radiochemical neutron activation analysis for 28 elements : Na, Mg, Al, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, As, Se, Br, Ru, Cd, Sb, La, Sm, Eu, Yb, Lu, Os, Ir and Au. Coolidge and Y-693 are members of the CV clan based on refractory lithophile abundances. Coolidge has significantly depleted volatile element abundances relative to CV3 chondrites and is tentatively classified as CV4. Y-693 is compositionally indistinguishable from the oxidized subgroup CV3 chondrites, showing no significant depletion of volatile element abundances, in conflict with the petrographic data indicating type 5; the chondrite may be heterogeneous. Compositional and petrographic data for Karoonda and ALH82135 suggest they form a grouplet, part of a clan with refractory lithophile abundances intermediate between those of the CM-CO and CV clans. Compositional classification of the severely weathered PCA82500 is difficult because of the scatter of data. It is probably closely related to Karoonda and ALH82135. |
format |
Report |
author |
Gregory W. Kallemeyn |
spellingShingle |
Gregory W. Kallemeyn Compositional comparisons of metamorphosed carbonaceous chondrites |
author_facet |
Gregory W. Kallemeyn |
author_sort |
Gregory W. Kallemeyn |
title |
Compositional comparisons of metamorphosed carbonaceous chondrites |
title_short |
Compositional comparisons of metamorphosed carbonaceous chondrites |
title_full |
Compositional comparisons of metamorphosed carbonaceous chondrites |
title_fullStr |
Compositional comparisons of metamorphosed carbonaceous chondrites |
title_full_unstemmed |
Compositional comparisons of metamorphosed carbonaceous chondrites |
title_sort |
compositional comparisons of metamorphosed carbonaceous chondrites |
publisher |
Institute of Geophysics and Planetary Physics, University of California |
publishDate |
1987 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2130 http://id.nii.ac.jp/1291/00002130/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2130&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(-68.707,-68.707,-85.639,-85.639) |
geographic |
Yamato Allan Hills Pecora Escarpment |
geographic_facet |
Yamato Allan Hills Pecora Escarpment |
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=2130 http://id.nii.ac.jp/1291/00002130/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 46, 151-161(1987-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2130&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067794350178304 |