Origin of fabrics and olivine chemical variations preserved in brachinite and brachinite‐like achondrite meteorites

Author:

Gruber Benjamin H.1ORCID,Nicklas Robert W.12,Day James M. D.1ORCID,Chin Emily J.1,Ren Minghua3,Bernard Rachel E.4

Affiliation:

1. Scripps Institution of Oceanography, University of California San Diego La Jolla California USA

2. Department of Earth and Environmental Sciences Boston College Chestnut Hill Massachusetts USA

3. Department of Geoscience University of Nevada, Las Vegas Las Vegas Nevada USA

4. Department of Geology Amherst College Amherst Massachusetts USA

Abstract

AbstractBrachinites and brachinite‐like achondrites are olivine‐rich meteorites that represent materials after partial metal–silicate differentiation on multiple early Solar System bodies. Both meteorite types show macroscopic textures of olivine crystals, which make up >70 modal percent of their mineralogy. We investigated the orientations of olivine using electron backscatter diffraction (EBSD) and elemental compositions from paired brachinite‐like achondrites and one brachinite. The olivine orientations are characterized by a strong concentration of [010] axes with maxima perpendicular to the foliation/layering and a concentration of [001] axes distributed in a girdle or, in a few samples, as point maxima. Trace element abundances of the olivine in these meteorites determined using laser ablation inductively coupled plasma–mass spectrometry have uniformly low concentrations of sodium (<300 μg g−1), aluminum (<70 μg g−1), and titanium (<40 μg g−1) that are distinct from olivine in chondrites or within terrestrial lavas. Instead, brachinite and brachinite‐like olivine compositions broadly overlap those of olivine from melt‐depleted mantle lithologies on Earth. Evidence from olivine trace element geochemistry, in conjunction with mineral fabrics, supports that these meteorites formed as melt residues on their host planetary body(ies).

Funder

National Aeronautics and Space Administration

Publisher

Wiley

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