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

Steven J. Jaret, E. Troy Rasbury, Peter Reiners, John G. Spray, Lucy M. Thompson, Sidney R. Hemming, Michelle S. Thompson

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)295-299
Number of pages5
JournalGeology
Volume51
Issue number3
DOIs
StatePublished - 2023

ASJC Scopus subject areas

  • Geology

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