Extreme isotopic heterogeneity in impact melt rocks: Implications for Martian meteorites-Reference-Cited by-同舟云学术

Extreme isotopic heterogeneity in impact melt rocks: Implications for Martian meteorites

Published:2023-02-07 Issue:3 Volume:51 Page:295-299
ISSN:0091-7613
Container-title:Geology
language:en
Short-container-title:

Author:

Jaret Steven J.¹,Rasbury E. Troy²,Reiners Peter³,Spray John G.⁴,Thompson Lucy M.⁴,Hemming Sidney R.⁵,Thompson Michelle S.⁶

Affiliation:

1. 1Department of Earth and Planetary Sciences, American Museum of Natural History, New York, New York 10024, USA

2. 2Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, USA

3. 3Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA

4. 4Planetary and Space Science Centre, University of New Brunswick, Fredericton, NB E3B 5A3, Canada

5. 5Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA

6. 6Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, USA

Abstract

AbstractLead 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.

Publisher

Geological Society of America

Subject

Geology

Link

https://pubs.geoscienceworld.org/gsa/geology/article-pdf/51/3/295/5794061/g50564.1.pdf

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