Original scientific paper
CONTACT PHENOMENA IN THE ROCKS OF MT. KALNIK (NW CROATIA)
Maja Vrkljan
Dunja Aljinović
Vesnica Garašić
Abstract
Scarce contacts between magnetic and sedimentary rocks have been investigated on the Mt. Kalnik. Magmatic rocks are in contact with shales, limestones, dolomites, and lithic greywackes. Some contacts are characterized by the tectonic nature. The primary contacts are either without contact metamprphic changes, or with them, whereas some contacts are characterized by close space relationship between magmatic and sedimentary rocks and also with contact phenomena in sedimentary rocks. The observed textural and chemical contact phenomena are the pronounced schistosity of sediments grading to the cleavage, contact extrusive breccias, limestone enclaves,wedge shaped denting, cracked sediments, the transformation of matrix, secondary minerals in veinlets and nests in sedimentary rocks, recrystallization, dolomitization, skarn paragenesis, silification, hematitization and the occurrence of ferrocalcite. Mentioned phenomena point to the synsedimentary and/or postsedimentary repeated extrusions and shallow intrusions of basic lavas. The diversity of contact phenomena indicates variable rates of extrusion, quantity and temperatures of lavas as also different grade of consolidation of sedimentary rocks.
Keywords
Mt. Kalnik; contact phenomena; extrusive breccias; limestone enclaves; wedge shaped denting; reaction rims in sediment; synsedimentary and/or postsedimentary extrusions
Hrčak ID:
5027
URI
Publication date:
4.12.2000.
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