Coesite and stishovite in the Vredefort Dome, South Africa

Details Coesite and stishovite in the Vredefort Dome, South Africa Coesite and stishovite in the Vredefort Dome, South Africa

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.272..715m&link_type=abstract

Nature, vol. 272, Apr. 20, 1978, p. 715-717.

Other

32

Coesite, Domes (Geology), Meteorite Craters, Republic Of South Africa, Stishovite, Metamorphism (Geology)

Scientific paper

Discoveries of the high pressure silica polymorphs, coesite and stishovite, associated with microcrystalline fibrous quartz in the Vredefort Dome, support the contention that the Dome is an astrobleme. Other evidence includes the presence of pseudotachylites, shatter cones, and deformation lamellae in quartz. The cataclysm is said to have taken place 1,970 Myr from the dating of granophyre dykes which have been emplaced after the formation of the Dome and are assumed to represent impact melts. Specific amounts of coesite and stishovite are assayed. It is noted that such substances can only form under conditions of very high pressure, and are characteristic of high energy shock metamorphism.

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