engleski

Fluid Inclusion in Pillow Lavas of Hruškovec, Mts. Kalnik

A large pile of pillow lavas in Hruškovec quarry, Kalnik Mt., is a basalt cryptodome intruded and extruded into wet, unconsolidated Triassic carbonate and siliciclastic sediments. It consists of variety of volcanic facies with a huge igneous body a few km long, thick several hundred m, tektonicaly dismembered and inplaced into Cretaceous melange formation. During emplacement the igneous body encountered hydrothermal activity evidenced by veins, filled out with secondary minerals calcite and quartz, hyaloclastite cement and infillings of cavities inside pillow lava pipes (calcite, quartz, pumpellyte, chlorite, epidote, etc.). The object of the study was quartz from hydrothermal veins cutting pillow lava formation and calcite inside the cavities of pillow lavas. Petrography of fluid inclusions recognized following types: 1. Monophase (L), 2. Liquid-rich, (L+V), 3. Vapor-rich, (V+L), 4. Multiphase with gypsum (L+V+SGYSUM), 5. Multiphase with carbonate (L+V+SCARBONAT) and 6. Multiphase with gypsum and carbonate (L+V+SGYSUM+SCARBONAT). Continuous spread of salinity between two end members, low salinity (NaCl-H2O) and CaCl2-rich, high salinity, suggests mixing of sea water and fluids formed during spilitization of igneous body.

pillow lava; fluid inclusion; cryptodome; vulcanic facies; hydrothermal viens

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