Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite
Most studies of Tagish Lake have considered features that were either strongly affected by or formed during the extensive hydrous alteration experienced by this meteorite. This has led to some ambiguity as to whether Tagish Lake should be classified a CI, a CM, or something else. Unlike previous wor...
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/14812 2023-05-15T18:30:01+02:00 Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite Simon, S. B. Grossman, L. 2003-01-01 application/pdf https://journals.uair.arizona.edu/index.php/maps/article/view/14812 eng eng Meteoritics & Planetary Science Archives https://journals.uair.arizona.edu/index.php/maps/article/view/14812/14783 https://journals.uair.arizona.edu/index.php/maps/article/view/14812 Meteoritics & Planetary Science Archives; Vol 38, No 5 (2003); 813-825 1945-5100 1086-9379 Cosmogenic isotopes;Strewn field;Olivine;Falls;L Chondrites info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2003 ftunivarizonaojs 2020-11-14T17:53:00Z Most studies of Tagish Lake have considered features that were either strongly affected by or formed during the extensive hydrous alteration experienced by this meteorite. This has led to some ambiguity as to whether Tagish Lake should be classified a CI, a CM, or something else. Unlike previous workers, we have focused upon the primary, anhydrous component of Tagish Lake, recovered through freeze-thaw disaggregation and density separation and located by thin section mapping. We found many features in common with CMs that are not observed in CIs. In addition to the presence of chondrules and refractory forsterite (which distinguish Tagish Lake from the CIs), we found hibonite-bearing refractory inclusions, spinel-rich inclusions, forsterite aggregates, Cr-, Al-rich spinel, and accretionary mantles on many clasts, which clearly establishes a strong link between Tagish Lake and the CM chondrites. The compositions of isolated olivine crystals in Tagish Lake are also like those found in CMs. We conclude that the anhydrous inclusion population of Tagish Lake was, originally, very much like that of the known CM chondrites and that the inclusions in Tagish Lake are heavily altered, more so than even those in Mighei, which are more heavily altered than those in Murchison. Article in Journal/Newspaper Tagish Journals at the University of Arizona Murchison ENVELOPE(144.250,144.250,-67.317,-67.317) Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) |
institution |
Open Polar |
collection |
Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
Cosmogenic isotopes;Strewn field;Olivine;Falls;L Chondrites |
spellingShingle |
Cosmogenic isotopes;Strewn field;Olivine;Falls;L Chondrites Simon, S. B. Grossman, L. Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
topic_facet |
Cosmogenic isotopes;Strewn field;Olivine;Falls;L Chondrites |
description |
Most studies of Tagish Lake have considered features that were either strongly affected by or formed during the extensive hydrous alteration experienced by this meteorite. This has led to some ambiguity as to whether Tagish Lake should be classified a CI, a CM, or something else. Unlike previous workers, we have focused upon the primary, anhydrous component of Tagish Lake, recovered through freeze-thaw disaggregation and density separation and located by thin section mapping. We found many features in common with CMs that are not observed in CIs. In addition to the presence of chondrules and refractory forsterite (which distinguish Tagish Lake from the CIs), we found hibonite-bearing refractory inclusions, spinel-rich inclusions, forsterite aggregates, Cr-, Al-rich spinel, and accretionary mantles on many clasts, which clearly establishes a strong link between Tagish Lake and the CM chondrites. The compositions of isolated olivine crystals in Tagish Lake are also like those found in CMs. We conclude that the anhydrous inclusion population of Tagish Lake was, originally, very much like that of the known CM chondrites and that the inclusions in Tagish Lake are heavily altered, more so than even those in Mighei, which are more heavily altered than those in Murchison. |
format |
Article in Journal/Newspaper |
author |
Simon, S. B. Grossman, L. |
author_facet |
Simon, S. B. Grossman, L. |
author_sort |
Simon, S. B. |
title |
Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
title_short |
Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
title_full |
Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
title_fullStr |
Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
title_full_unstemmed |
Petrography and mineral chemistry of the anhydrous component of the Tagish Lake carbonaceous chondrite |
title_sort |
petrography and mineral chemistry of the anhydrous component of the tagish lake carbonaceous chondrite |
publisher |
Meteoritics & Planetary Science Archives |
publishDate |
2003 |
url |
https://journals.uair.arizona.edu/index.php/maps/article/view/14812 |
long_lat |
ENVELOPE(144.250,144.250,-67.317,-67.317) ENVELOPE(-134.272,-134.272,60.313,60.313) ENVELOPE(-134.233,-134.233,59.717,59.717) |
geographic |
Murchison Tagish Tagish Lake |
geographic_facet |
Murchison Tagish Tagish Lake |
genre |
Tagish |
genre_facet |
Tagish |
op_source |
Meteoritics & Planetary Science Archives; Vol 38, No 5 (2003); 813-825 1945-5100 1086-9379 |
op_relation |
https://journals.uair.arizona.edu/index.php/maps/article/view/14812/14783 https://journals.uair.arizona.edu/index.php/maps/article/view/14812 |
_version_ |
1766213489155637248 |