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

被引：2

作者：

Jaret, Steven J. ^{[1
,7
]}

Rasbury, E. Troy ^{[2
]}

Reiners, Peter ^{[3
]}

Spray, John G. ^{[4
]}

Thompson, Lucy M. ^{[4
]}

Hemming, Sidney R. ^{[5
]}

Thompson, Michelle S. ^{[6
]}

机构：

[1] Amer Museum Nat Hist, Dept Earth & Planetary Sci, New York, NY 10024 USA

[2] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA

[3] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA

[4] Univ New Brunswick, Planetary & Space Sci Ctr, Fredericton, NB E3B 5A3, Canada

[5] Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[6] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA

[7] CUNY, Kingsborough Community Coll, Brooklyn, NY 11235 USA

来源：

GEOLOGY | 2023年 / 51卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

IGNEOUS ROCKS; U-PB; SHOCK; CONSTRAINTS; PROVENANCE; FELDSPARS; EVOLUTION; SYSTEM; AGES; MARS;

D O I：

10.1130/G50564.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

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 petro-genetic model for some of the Martian shergottites.

引用

页码：295 / 299

页数：5

共 32 条

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