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Clinoeulite (magnesian clinoferrosilite) in a eulysite of a metamorphosed iron formation in the vredefort structure, South Africa by W. Schreyer; D. Stepto; K. Abraham; W. F. Mller is a Earth and Planetary Sciences article available to read on EtoBox.

What is Clinoeulite (magnesian clinoferrosilite) in a eulysite of a metamorphosed iron formation in the vredefort structure, South Africa about?

A unique clinopyroxene (En19Fs78Wo3), clinoeulite, space group P21/c, (Fex.gsMg0.37MnZ+sCao.05A10.01)1.99 [Si2.0106], contains sharp exsolution lamellae of ferroaugite (EnaTFs43Wo4o) from which the former presence of a ferropigeonite near EnaTFsToWo13 can be calculated. This two-pyroxene intergrowth is the main component of a eulysite containing also magnetite, olivine (FogFaa6Tes), quartz, oligoclase-K feldspar intergrowth, and retrograde cummingtonite with about 76 % grunerite end member. The occurrence of this most unusual rock type in the center of the Vredefort structure is attributed to a period of high-temperature metamorphism (at least 800~176 which was followed by hot deformation of the rock during the Vredefort event thus probably preventing the common formation of orthopyroxene through pigeonite exsolution and inversion upon cooling. After this tectonic deformation, the rock recrystallized within the low-temperature stability range of clinoeulite to yield fine annealing textures. Late-stage equilibria at temperatures well below 500~ include the complete unmixing of a former high-temperature anorthoclase, a Mg/Fe redistribution in the clinoeulite and olivine and, with the

Who reads Clinoeulite (magnesian clinoferrosilite) in a eulysite of a metamorphosed iron formation in the vredefort structure, South Africa?

Author

W. Schreyer; D. Stepto; K. Abraham; W. F. Mller

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0010-7999)

Published

1978

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)