Geochemistry and the origin of manganese mineralizations in Derbent (Yozgat) Region

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Öksüz N.

Yerbilimleri/Hacettepe Üniversitesi Yerbilimleri Uygulama ve Araştırma Merkezi Dergisi, vol.32, no.3, pp.213-234, 2011 (Scopus)


Manganese mineralizations occurring widely in Yozgat area (Derbent, Cihanpaşa, Baltasari{dotless}lar, Büyük Mahal, Eymir and Kadi{dotless}şehri Tarhana Village) are observed in Artova ophiolitic units. In this study two different manganese mineralizations, determined in this area, have been compared in terms of the formation of the manganese ore. The first mineralization takes place 5 km east of the Derbent in the Mahkeme Hill (MT), whereas the other occurs in the north and south of the Derbent lake (DG). The mineralizations are observed as banded and lenticular forms and all are related with lower Cretaceous chert series in the north-west of Yozgat. Manganese ores, which are generally observed together with deformed radiolarian units, show a folded, fractured and irregular structure. Mineral paragenesis consists of manganite, magnetite and pyrolusite and gang minerals are calcite and quartz in Mahkeme Hill (MT), whereas mineral paragenesis of the Derbent Lake region consists of pyrolusite and goethite, and the gang mineral is represented by quartz. According to geological, mineralogical and geochemical data (major, trace and REE) observed in Derbent village (MT) and (DG) areas, the manganese mineralizations have formed by both hydrothermal and hydrogenous-diagenetic processes.