Faculty of mining, geology and civil engineering, University of Tuzla, Tuzla, Bosnia and Herzegovina
Faculty of mining, geology and civil engineering, University of Tuzla, Tuzla, Bosnia and Herzegovina
Faculty of mining and geology, University of Belgrade, Belgrade, Serbia
Faculty of mining and geology, University of Belgrade, Belgrade, Serbia
Total number of nineteen mafic extrusive rock samples is subjected to the detailed optical examination. Based on definition of mineral composition, structure, texture, type and intensity of alteration processes, and taking into consideration the recent classification schemes, different lithotypes are defined. The most frequent are spilites distinguished by classical "spilite" mineralogy (albite), and very often with "quench" texture and amygdaloidal structure. Diabases consist of primary plagioclase and clinopyroxene which are often decomposed and disintegrated. Diabase rocks are mostly characterised with ophitic texture and massive structure. Coarse grained varieties are characterized as dolerites, the rocks in which intensity of alteration process is significantly lower than in previous lithotypes. Varieties with frequent occurrences of amphibole got adjective amphibolic. The most common and the most intense alteration processes are albitization and chloritization. Alteration processes of lower intensity are actinolitization, pumpellytization, zeolitization, carbonation-calcitization, limonitization, kaolinitization and silicification. Depending on alteration degree a certain lithotypes are named with prefix meta (metadiabases and metadolerites).
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