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Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Zoned dyke of ocellar lamprophyre to hornblendite near Dobříš

František Holub

Geoscience Research Reports 37, 2004 (GRR for 2003), pages 106–108

Keywords: Central Bohemia, Chemical Analyses, lamprohyre, hornblendite, ocelli

Map sheets: Dobříš (12-43)

Full text (PDF, 1.17 MB)

Abstract

Zoned dyke of olivine-clinopyroxene kersantite (margins)-olivine spessartite-olivine hornblendite (centre) composition has been found in the vicinity of Dobříš, about 35 km SW of Prague. The dyke is conspicuous for its ocellar structure that originated probably as segregation vesicles filled partly with residual hydrous melt and partly with crystallization products of the fluid phase solute.