Phase composition and crystallochemical characteristics of pyroxenes from Vetluga eucrite breccia in connection with the formation conditions of ordinary eucrites

Details Phase composition and crystallochemical characteristics of pyroxenes from Vetluga eucrite breccia in connection with the formation conditions of ordinary eucrites Phase composition and crystallochemical characteristics of pyroxenes from Vetluga eucrite breccia in connection with the formation conditions of ordinary eucrites

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988geokh.......87k&link_type=abstract

Geokhimiia (ISSN 0016-7525), Jan. 1988, p. 87-99. In Russian.

Other

Abundance, Breccia, Chemical Composition, Meteoritic Composition, Pyroxenes, Basalt, Chromium, Metal Ions, Thermal Decomposition, Titanium

Scientific paper

The chemical composition of individual pyroxene crystals from the Vetluga meteorite was investigated together with the composition and structure of pyroxenic decomposition phases. The results of these analyses were used to evaluate the stages in the thermal history of the Vetluga meteorite and of other eucrites. It is shown that increases of the Cr/Al and Ti/Al ratios in the eucrites of the Vetluga, Juvinas, Nuevo Laredo, Stannern series correlate with the increased rate of subsolidus cooling in this series and with the degree of reduction, suggesting more reduced conditions for the formation of these pyroxenes relative to that of the earth basalts. The successive stages in the thermal history of common eucrites, which begins with the consolidation of matter and proceed toward the formation of pyroxenic decomposition phases are described.

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