Extreme isotopic heterogeneity in impact melt rocks: Implications for Martian meteorites
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Author
Jaret, Steven J.Rasbury, E. Troy
Reiners, Peter
Spray, John G.
Thompson, Lucy M.
Hemming, Sidney R.
Thompson, Michelle S.
Affiliation
Department of Geosciences, University of ArizonaIssue Date
2023-02-07Keywords
Geology
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Geological Society of AmericaCitation
Steven J. Jaret, E. Troy Rasbury, Peter Reiners, John G. Spray, Lucy M. Thompson, Sidney R. Hemming, Michelle S. Thompson; Extreme isotopic heterogeneity in impact melt rocks: Implications for Martian meteorites. Geology 2023;; 51 (3): 295–299. doi: https://doi.org/10.1130/G50564.1Journal
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© 2023 Geological Society of America.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Lead isotope ratios have been determined in multiple feldspar grains from hand samples of impact melt rock at the Manicouagan and Sudbury impact structures in Canada. The results reveal an extreme range of isotope values. This indicates that melt sheets are not homogeneous with respect to Pb at the millimeter scale. Such heterogeneity is significantly larger than that seen in non-impact-generated igneous rocks. Individual Pb isotope ratios of feldspars from Martian shergottites show a large range in 206Pb/204Pb values within one sample, more similar to the terrestrial impact melt sheets than to nonimpact igneous rocks. We suggest crystallization from impact melt sheets rather than volcanic sources as a petrogenetic model for some of the Martian shergottites.Note
12 month embargo; first published 07 February 2023ISSN
0091-7613EISSN
1943-2682DOI
10.1130/g50564.1Version
Final accepted manuscriptae974a485f413a2113503eed53cd6c53
10.1130/g50564.1