Mineralogical Records of Early Planetary Processes of the HED Parent Body

Details Mineralogical Records of Early Planetary Processes of the HED Parent Body Mineralogical Records of Early Planetary Processes of the HED Parent Body

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996eiaf.conf...30t&link_type=abstract

Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites, p. 30

Mathematics

Logic

Achondrites, Crystallization, Fractionation, Melting, Meteoritic Composition, Crusts, Mineralogy, Pyroxenes, Meteorites, Cooling

Scientific paper

A group of achondrites in the howardite-eucrite-diogenite series is called HED because they form a continuous series of mineralogical, crystallographic, and chemical variations of minerals, especially of pyroxenes. The key samples filling a gap between diogenites and eucrites and howardites and polymict eucrites have been found in the Antarctic meteorite collections. They often have been ignored in some discussions on the partial melting (PM) models vs. crystal fractionation (CF) models for the formation of the HED parent body. There have been two approaches to deciphering the crystallization trend of the HED parent body: (1) Arrangements of individual monomict or crystalline samples in the order of crystallization and cooling; and (2) Reconstruction of the original crust before cratering events from polymict breccias such as howardites and polymict eucrites. Difficulties in these approaches are due to cratering mixing of and metamorphic overprints on the original crustal materials. Combined chronological and mineralogical studies of metamorphosed monomict eucrites (often called ordinary eucrites) revealed that they experienced extensive thermal metamorphic events in the early history of the crustal evolution, and that impact craterings are later events ranging from 4.1 to 3.4 Ga ago. In this paper, several important observational facts and new results are given, then a total picture in agreement with these items are envisioned subsequently.

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