Zoned dyke of ocellar lamprophyre to hornblendite near Dobříš


František Holub

Geoscience Research Reports 37, 2004 (GRR for 2003), pages 106–108
Map sheets: Dobříš (12-43)

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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.