Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration

Abstract Here, we evaluate the extent of aqueous alteration among five pristine specimens of the ungrouped Tagish Lake carbonaceous chondrite ( TL 5b, TL 11h, TL 11i, TL 4, and TL 10a) using thermogravimetric analysis ( TGA ) and infrared ( IR ) transmission spectroscopy. Both TGA and IR spectroscop...

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Published in:Meteoritics & Planetary Science
Main Authors: Gilmour, Cosette M., Herd, Christopher D. K., Beck, Pierre
Other Authors: Natural Sciences and Engineering Research Council of Canada
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2019
Subjects:
Online Access:http://dx.doi.org/10.1111/maps.13362
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spelling crwiley:10.1111/maps.13362 2024-09-30T14:44:40+00:00 Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration Gilmour, Cosette M. Herd, Christopher D. K. Beck, Pierre Natural Sciences and Engineering Research Council of Canada 2019 http://dx.doi.org/10.1111/maps.13362 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.13362 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13362 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13362 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 54, issue 9, page 1951-1972 ISSN 1086-9379 1945-5100 journal-article 2019 crwiley https://doi.org/10.1111/maps.13362 2024-09-17T04:51:35Z Abstract Here, we evaluate the extent of aqueous alteration among five pristine specimens of the ungrouped Tagish Lake carbonaceous chondrite ( TL 5b, TL 11h, TL 11i, TL 4, and TL 10a) using thermogravimetric analysis ( TGA ) and infrared ( IR ) transmission spectroscopy. Both TGA and IR spectroscopy have proven to be reliable methods for determining the extent of aqueous alteration among different carbonaceous chondrites, in particular the CM chondrites (e.g., Garenne et al. 2014), with which Tagish Lake shares some affinities. Using these two methods, our goal is to incorporate TL 4 and TL 10a into the known alteration sequence of TL 5b < TL 11h < TL 11i (Herd et al. 2011; Blinova et al. 2014a). This study highlights the compositional variability of the Tagish Lake specimens, which we ascribe to its brecciated nature. Our TGA and IR spectroscopy results are congruent with the reported alteration sequence, allowing us to introduce the TL 4 and TL 10a specimens in the following order: TL 4 < TL 5b ≤ TL 10a < TL 11h < TL 11i. Notably, these two specimens appear to be similar to the least altered lithologies previously reported, and the alteration of Tagish Lake is similar to that experienced by lesser altered members of the CM chondrites (> CM 1.6). Based on these findings, Tagish Lake could be considered a 1.6–2.0 ungrouped carbonaceous chondrite. Visible and near‐IR reflectance measurements of Tagish Lake were also acquired in this study to revisit the Tagish Lake parent body connection. While other studies have paired Tagish Lake with D‐ and T‐type asteroid parent bodies, the reflectance spectra acquired in this study are variable among the different Tagish Lake specimens in relation to their alteration sequences; results match with spectra characteristic of C‐, X‐, Xc‐, and D‐type asteroids. The heterogeneity of Tagish Lake coupled with its low albedo makes the parent body connection a challenge. Article in Journal/Newspaper Tagish Wiley Online Library Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) Meteoritics & Planetary Science 54 9 1951 1972
institution Open Polar
collection Wiley Online Library
op_collection_id crwiley
language English
description Abstract Here, we evaluate the extent of aqueous alteration among five pristine specimens of the ungrouped Tagish Lake carbonaceous chondrite ( TL 5b, TL 11h, TL 11i, TL 4, and TL 10a) using thermogravimetric analysis ( TGA ) and infrared ( IR ) transmission spectroscopy. Both TGA and IR spectroscopy have proven to be reliable methods for determining the extent of aqueous alteration among different carbonaceous chondrites, in particular the CM chondrites (e.g., Garenne et al. 2014), with which Tagish Lake shares some affinities. Using these two methods, our goal is to incorporate TL 4 and TL 10a into the known alteration sequence of TL 5b < TL 11h < TL 11i (Herd et al. 2011; Blinova et al. 2014a). This study highlights the compositional variability of the Tagish Lake specimens, which we ascribe to its brecciated nature. Our TGA and IR spectroscopy results are congruent with the reported alteration sequence, allowing us to introduce the TL 4 and TL 10a specimens in the following order: TL 4 < TL 5b ≤ TL 10a < TL 11h < TL 11i. Notably, these two specimens appear to be similar to the least altered lithologies previously reported, and the alteration of Tagish Lake is similar to that experienced by lesser altered members of the CM chondrites (> CM 1.6). Based on these findings, Tagish Lake could be considered a 1.6–2.0 ungrouped carbonaceous chondrite. Visible and near‐IR reflectance measurements of Tagish Lake were also acquired in this study to revisit the Tagish Lake parent body connection. While other studies have paired Tagish Lake with D‐ and T‐type asteroid parent bodies, the reflectance spectra acquired in this study are variable among the different Tagish Lake specimens in relation to their alteration sequences; results match with spectra characteristic of C‐, X‐, Xc‐, and D‐type asteroids. The heterogeneity of Tagish Lake coupled with its low albedo makes the parent body connection a challenge.
author2 Natural Sciences and Engineering Research Council of Canada
format Article in Journal/Newspaper
author Gilmour, Cosette M.
Herd, Christopher D. K.
Beck, Pierre
spellingShingle Gilmour, Cosette M.
Herd, Christopher D. K.
Beck, Pierre
Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
author_facet Gilmour, Cosette M.
Herd, Christopher D. K.
Beck, Pierre
author_sort Gilmour, Cosette M.
title Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
title_short Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
title_full Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
title_fullStr Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
title_full_unstemmed Water abundance in the Tagish Lake meteorite from TGA and IR spectroscopy: Evaluation of aqueous alteration
title_sort water abundance in the tagish lake meteorite from tga and ir spectroscopy: evaluation of aqueous alteration
publisher Wiley
publishDate 2019
url http://dx.doi.org/10.1111/maps.13362
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.13362
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long_lat ENVELOPE(-134.272,-134.272,60.313,60.313)
ENVELOPE(-134.233,-134.233,59.717,59.717)
geographic Tagish
Tagish Lake
geographic_facet Tagish
Tagish Lake
genre Tagish
genre_facet Tagish
op_source Meteoritics & Planetary Science
volume 54, issue 9, page 1951-1972
ISSN 1086-9379 1945-5100
op_rights http://onlinelibrary.wiley.com/termsAndConditions#vor
op_doi https://doi.org/10.1111/maps.13362
container_title Meteoritics & Planetary Science
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