Diaplectic alterations of some rock-forming minerals

Details Diaplectic alterations of some rock-forming minerals Diaplectic alterations of some rock-forming minerals

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987geokh.....1615f&link_type=abstract

Geokhimiia (ISSN 0016-7525), Nov. 1987, p. 1615-1627. In Russian.

Astronomy and Astrophysics

Astronomy

Impact Loads, Metamorphism (Geology), Meteorites, Mineralogy, Solid Phases, Biotite, Garnets, Inclusions, Phase Diagrams, Quartz, Shock Loads

Scientific paper

The nature of solid-phase diaplectic changes in minerals due to collisional loads of up to 250 kbar were investigated by analyzing biotite, staurolite, and garnet samples from the Janisjarvi astrobleme. Impact load was estimated from the density and the diffraction index, using Stoeffler's (1974) diagrams. It was found that, in garnet exposed to loads below 200 kbar, metamorphic changes caused by impact were minimal; chemical changes started to appear at pressures above 200 kbar. Biotite and staurolite exhibited an allochemical character of diaplectic alterations, leading to the formation of a mixture consisting of orthopyroxene, potassic feldspar, opaques, and glass. At the impact load of 200 to 250 kbar, biotite and staurolite are replaced by these phases almost completely.

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