'ECLOGITIC' MINERALS IN A SHOCKED BASALTIC METEORITE

dc.contributor.author	Langenhorst F.
dc.contributor.author	Poirier J.P.
dc.date.accessioned	2021-01-22T08:02:52Z
dc.date.available	2021-01-22T08:02:52Z
dc.date.issued	2000
dc.identifier	https://elibrary.ru/item.asp?id=215834
dc.identifier.citation	Earth and Planetary Science Letters, 2000, 176, 3, 259-265
dc.identifier.issn	0012-821X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/23512
dc.description.abstract	Analytical transmission electron microscopy (ATEM) was used to characterize mineral parageneses occurring in melt veins of shock origin in the Martian meteorite Zagami. We discovered a new ultra-high pressure 'eclogite facies' mineral assemblage consisting of omphacite, stishovite, and KAlSi3O8 hollandite. These tiny (<200-300 nm) high-pressure minerals are embedded in silicate glass, which forms the groundmass of shock veins. microtexture veins and zoning clinopyroxene indicate formation by crystallization from a melt. using calibration data multi-anvil experiments we infer that frictional melting occurred at minimum temperatures 2400-2500°C and at a pressure of ca. 30 GPa. Subsequently, the high-pressure phases crystallized during decompression in the pressure interval from 25-5 GPa.
dc.subject	MARTIAN METEORITES
dc.subject	IMPACTS
dc.subject	SHOCK METAMORPHISM
dc.subject	HIGH PRESSURE
dc.subject	MINERALS
dc.title	'ECLOGITIC' MINERALS IN A SHOCKED BASALTIC METEORITE
dc.type	Статья

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