The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry
We report here on an ion probe study of rare earth element (REE) geochemistry in the lherzolitic shergottite Grove Mountains (GRV) 99027. This meteorite shows almost identical mineralogy, petrology, and REE geochemistry to those of the lherzolitic shergottites Allan Hills (ALH) A77005, Lewis Cliff (...
Published in: | Meteoritics & Planetary Science |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Meteoritical Society
2004
|
Subjects: | |
Online Access: | https://doi.org/10.1111/j.1945-5100.2004.tb00113.x |
id |
ftcaltechauth:oai:authors.library.caltech.edu:w8hne-4wv09 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:w8hne-4wv09 2024-09-15T17:42:59+00:00 The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry Hsu, Weibiao Guan, Yunbin Wang, Henian Leshin, Laurie A. Wang, Rucheng Zhang, Wenlan Chen, Xiaoming Zhang, Fusheng Lin, Chengyi 2004-05 https://doi.org/10.1111/j.1945-5100.2004.tb00113.x unknown Meteoritical Society https://doi.org/10.1111/j.1945-5100.2004.tb00113.x oai:authors.library.caltech.edu:w8hne-4wv09 eprintid:119764 resolverid:CaltechAUTHORS:20230307-650431000.52 info:eu-repo/semantics/openAccess Other Meteoritics and Planetary Science, 39(5), 701-709, (2004-05) Space and Planetary Science Geophysics info:eu-repo/semantics/article 2004 ftcaltechauth https://doi.org/10.1111/j.1945-5100.2004.tb00113.x 2024-08-06T15:35:01Z We report here on an ion probe study of rare earth element (REE) geochemistry in the lherzolitic shergottite Grove Mountains (GRV) 99027. This meteorite shows almost identical mineralogy, petrology, and REE geochemistry to those of the lherzolitic shergottites Allan Hills (ALH) A77005, Lewis Cliff (LEW) 88516, and Yamato (Y-) 793605. REE concentrations in olivine, pyroxenes, maskelynite, merrillite, and melt glass are basically comparable to previous data obtained from ALH A77005, LEW 88516, and Y-793605. Olivine is the dominant phase in this meteorite. It is commonly enclosed by large (up to several mm) pigeonite oikocrysts. Non-poikilitic areas consist of larger olivine grains (˜mm), pigeonite, augite, and maskelynite. Minor merrillite (up to 150 μm in size) is widespread in non-poikilitic regions, occurring interstitially between olivine and pyroxene grains. It is the main REE carrier in GRV 99027 and has relatively higher REEs (200–1000 × CI) than that of other lherzolitic shergottites. A REE budget calculation for GRV 99027 yields a whole rock REE pattern very similar to that of other lherzolites. It is characterized by the distinctive light REE depletion and a smooth increase from light REEs to heavy REEs. REE microdistributions in GRV 99027 strongly support the idea that all lherzolitic shergottites formed by identical igneous processes, probably from the same magma chamber on Mars. Despite many similarities in mineralogy, petrography, and trace element geochemistry, subtle differences exist between GRV 99027 and other lherzolitic shergottites. GRV 99027 has relatively uniform mineral compositions (both major elements and REEs), implying that it suffered a higher degree of sub-solidus equilibration than the other three lherzolites. It is notable that GRV 99027 has experienced terrestrial weathering in the Antarctic environment, as its olivine and pyroxenes commonly display a light REE enrichment and a negative Ce anomaly. Caution needs to be taken in future chronological studies. We acknowledge the ... Article in Journal/Newspaper Antarc* Antarctic Caltech Authors (California Institute of Technology) Meteoritics & Planetary Science 39 5 701 709 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Space and Planetary Science Geophysics |
spellingShingle |
Space and Planetary Science Geophysics Hsu, Weibiao Guan, Yunbin Wang, Henian Leshin, Laurie A. Wang, Rucheng Zhang, Wenlan Chen, Xiaoming Zhang, Fusheng Lin, Chengyi The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
topic_facet |
Space and Planetary Science Geophysics |
description |
We report here on an ion probe study of rare earth element (REE) geochemistry in the lherzolitic shergottite Grove Mountains (GRV) 99027. This meteorite shows almost identical mineralogy, petrology, and REE geochemistry to those of the lherzolitic shergottites Allan Hills (ALH) A77005, Lewis Cliff (LEW) 88516, and Yamato (Y-) 793605. REE concentrations in olivine, pyroxenes, maskelynite, merrillite, and melt glass are basically comparable to previous data obtained from ALH A77005, LEW 88516, and Y-793605. Olivine is the dominant phase in this meteorite. It is commonly enclosed by large (up to several mm) pigeonite oikocrysts. Non-poikilitic areas consist of larger olivine grains (˜mm), pigeonite, augite, and maskelynite. Minor merrillite (up to 150 μm in size) is widespread in non-poikilitic regions, occurring interstitially between olivine and pyroxene grains. It is the main REE carrier in GRV 99027 and has relatively higher REEs (200–1000 × CI) than that of other lherzolitic shergottites. A REE budget calculation for GRV 99027 yields a whole rock REE pattern very similar to that of other lherzolites. It is characterized by the distinctive light REE depletion and a smooth increase from light REEs to heavy REEs. REE microdistributions in GRV 99027 strongly support the idea that all lherzolitic shergottites formed by identical igneous processes, probably from the same magma chamber on Mars. Despite many similarities in mineralogy, petrography, and trace element geochemistry, subtle differences exist between GRV 99027 and other lherzolitic shergottites. GRV 99027 has relatively uniform mineral compositions (both major elements and REEs), implying that it suffered a higher degree of sub-solidus equilibration than the other three lherzolites. It is notable that GRV 99027 has experienced terrestrial weathering in the Antarctic environment, as its olivine and pyroxenes commonly display a light REE enrichment and a negative Ce anomaly. Caution needs to be taken in future chronological studies. We acknowledge the ... |
format |
Article in Journal/Newspaper |
author |
Hsu, Weibiao Guan, Yunbin Wang, Henian Leshin, Laurie A. Wang, Rucheng Zhang, Wenlan Chen, Xiaoming Zhang, Fusheng Lin, Chengyi |
author_facet |
Hsu, Weibiao Guan, Yunbin Wang, Henian Leshin, Laurie A. Wang, Rucheng Zhang, Wenlan Chen, Xiaoming Zhang, Fusheng Lin, Chengyi |
author_sort |
Hsu, Weibiao |
title |
The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
title_short |
The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
title_full |
The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
title_fullStr |
The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
title_full_unstemmed |
The lherzolitic shergottite Grove Mountains 99027: Rare earth element geochemistry |
title_sort |
lherzolitic shergottite grove mountains 99027: rare earth element geochemistry |
publisher |
Meteoritical Society |
publishDate |
2004 |
url |
https://doi.org/10.1111/j.1945-5100.2004.tb00113.x |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Meteoritics and Planetary Science, 39(5), 701-709, (2004-05) |
op_relation |
https://doi.org/10.1111/j.1945-5100.2004.tb00113.x oai:authors.library.caltech.edu:w8hne-4wv09 eprintid:119764 resolverid:CaltechAUTHORS:20230307-650431000.52 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1111/j.1945-5100.2004.tb00113.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
39 |
container_issue |
5 |
container_start_page |
701 |
op_container_end_page |
709 |
_version_ |
1810489804944572416 |