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The listwaenites formed by alteration of Sarkikaraagac ophiolite related to Beysehir-Hoyran nappes extend 16 km in NW-SE direction, and display 80 to 750 m width in the study area. Based on mineralogical composition, alteration intensity, geochemical characteristics and formation, listwaenites outcropping between Madenli and Belcegiz areas display two types of formation as silica-carbonate and carbonate type listwaenites. In terms of mineralogical composition, quartz, calcite, dolomite, clay (serpentine), enstatite, forsterite, amphibole, plagioclase, and magnesite minerals have been found in silica-carbonate type listwaenites. Carbonate type listwaenites contain calcite, dolomite, clay (serpentine+Mg-smectite), quartz, enstatite, forsterite, and magnesite minerals. Hydrothermal solutions and meteoric waters altering the ultramafic rocks dissolved the soluble elements, and then carried and removed ions and chemical compounds. However, due to leaching of soluble elements from the rocks, enrichment of dissoluble elements was clearly observed. In study area, An, As, Zn, and Cu element enrichments were not observed in listwaenites known as potential rocks for Au, Ca, from the lithologies including carbonate rocks of the region, CO2, both from lithologies and meteoric waters, and Mg+2 ions result from ultrabasic rocks. Silica-carbonate and carbonate types of listwaenites are thought to be formed by hydrothermal solutions and meteoric waters in connection with seawater and formation water at the late stages of tectonic emplacement. As a result, listwaenites outcropping in the study area have been derived from which originated mid-ocean ridge environment ultramafic rocks from light rare earth elements depleted magma. |
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