The Shallowater aubrite - Evidence for origin by planetesimal impacts

Details The Shallowater aubrite - Evidence for origin by planetesimal impacts The Shallowater aubrite - Evidence for origin by planetesimal impacts

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.3291k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Dec. 1989, p. 3291-3307.

Mathematics

Logic

21

Meteorite Craters, Meteoritic Microstructures, Protoplanets, Achondrites, Planetary Geology, Solar System

Scientific paper

This paper presents the results of petrographic, mineralogic, and bulk trace element analyses of Shallowater aubrite samples, and interprets them in terms of the meteorite's origin. On the basis of these analyses, it is argued that Shallowater did not form on the aubrite parent body but represents a fourth enstatite meteorite body (in addition to the H and L enstatite chondrite and aubrite parent bodies). It is shown that its peculiar composition, texture, and cooling history can best be explained by an origin involving a low-velocity collision and breakup of a molten or a partly molten asteroid, consisting largely of a melt of MgSiO3 composition, with a solid, enstatite meteoritelike object.

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