Thermal and impact history of pyroxenes from the Vetluga meteorite according to data of an X-ray diffraction study

Details Thermal and impact history of pyroxenes from the Vetluga meteorite according to data of an X-ray diffraction study Thermal and impact history of pyroxenes from the Vetluga meteorite according to data of an X-ray diffraction study

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988geokh......333k&link_type=abstract

Geokhimiia (ISSN 0016-7525), March 1988, p. 333-342. In Russian.

Computer Science

Igneous Rocks, Meteoritic Composition, Phase Transformations, Pyroxenes, X Ray Diffraction, Chemical Composition, Crystal Structure, Geomorphology

Scientific paper

The structural and phase characteristics of individual clinopyroxene grains from the Vetluga eucrite were investigated using X-ray diffraction, and the results were used for reconstruction of the meteorite's thermal and impact history. It was found that the decay of clinopyroxenes was multiphasic and was accompanied by inversional structural transformations during subsolidus cooling. From the details of subsolidus history of the clinopyroxene crystals deduced from geometric ratios of the breakdown phases it is concluded that the initial meteoritic rocks have undergone multiple impacts, accompanied by irregular heating, in the course of which primary exsolution structures of pyroxene crystals were formed. Slow cooling led to the formation of secondary exsolution structures.

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