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The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall

; ; 
Shirley, KS
; 
Bonsall, E
; 
Schröder, C
; 
Wombacher, F
; 
Fockenberg, T
; 
Curtis, RJ
; 
Bowles, NE
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2024-05-10
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2022-06-14
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Earth sciences
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Abstract - On the microscale, the Winchcombe CM carbonaceous chondrite contains a number of lithological units with a variety of degrees of aqueous alteration. However, an understanding of the average hydration state is useful when comparing to other meteorites and remote observations of airless bodies. We report correlated bulk analyses on multiple subsamples of the Winchcombe meteorite, determining an average phyllosilicate fraction petrologic type of 1.2 and an average water content of 11.9 wt%. We show the elemental composition and distribution of iron and iron oxidation state are consistent with measurements from other CM chondrites; however, Winchcombe shows a low Hg concentration of 58.1 ± 0.5 ng g<jats:sup>−1</jats:sup>. We demonstrate that infrared reflectance spectra of Winchcombe are consistent with its bulk modal mineralogy, and comparable to other CM chondrites with similar average petrologic types. Finally, we also evaluate whether spectral parameters can estimate H/Si ratios and water abundances, finding generally spectral parameters underestimate water abundance compared to measured values.
Citation
Bates, H.C., King, A.J., Shirley, K.S., Bonsall, E., Schröder, C., Wombacher, F., Fockenberg, T., Curtis, R.J. and Bowles, N.E. (2024), The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall. Meteorit Planet Sci, 59: 1006-1028. https://doi.org/10.1111/maps.14043
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Wiley
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Meteoritics &amp; Planetary Science
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http://hdl.handle.net/10141/623154
DOI
10.1111/maps.14043
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Copyright © 2023 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The attached file is the published version of the article.
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1086-9379
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1945-5100
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