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Cordierite-orthopyroxene rocks: the granulite facies equivalents of the Orijärvi cordierite-anthophyllite rocks in West Uusimaa, southwest Finland

1985; Elsevier BV; Volume: 18; Linguagem: Inglês

10.1016/0024-4937(85)90026-x

1872-6143

J. W. H. Schreurs, L. Westra,

Geological and Geochemical Analysis

Cordierite-hypersthene rocks with a chemistry comparable to the cordierite-anthophyllite rocks of Orijärvi have been found in the high-grade West Uusimaa Complex, SW Finland. Chemistry, petrography, and spatial relations indicate that the cordierite-hypersthene rocks represent the high-grade equivalents of the Orijärvi cordierite-anthophyllite rocks. Metamorphic conditions for the Orijärvi and West Uusimaa Complex occurrences are estimated at respectively 550–650°C, 3–5 kbar, low H2O activity and 710–810°C, 3–5 kbar, low H2O-high CO2 activity. Cordierte-anthophyllite rocks are generally associated with massive CuPbZn deposits. It is suggested that the cordierite-hypersthene rocks might be potential guides to CuPbZn deposits in high-grade regions.