Abstract
The Artova ophiolite complex (AOC) is exposed along the northwestern and eastern margins of Yozgat area in Turkey. The Mn-deposit in the Buyukmahal area is part of this ophiolite complex. The deposit is in banded and lenticular forms and hosted by a radiolarite unit overlying the volcanics. Pyrolusite and magnetite are the main minerals of the manganese ore in the Buyukmahal (Yozgat) area. The gang minerals in the deposit are composed only of quartz and calcite. In this study, mineralogy, major oxide, trace element and REE contents of Buyukmahal manganese mineralization are evaluated. The geochemical data indicate that Buyukmahal mineralization does not originate from a pure hydrothermal or pure hydrogenous source but from a system consisting of both sources. It is also asserted that the mineralization was first developed on a sea floor spreading center within the Alpine Ophiolite System and then obducted as part of the AOC.
Highlights
The Alpine Ophiolite System (AOC) is exposed along the northwestern and eastern margins of the Yozgat region in Turkey
The Mn mineralization in the Buyukmahal is a part of this ophiolite complex
The Eymir manganese deposit which is genetically linked to Buyukmahal mineralization occurs within radiolarite cherts of the lower Cretaceous ophiolite complex [1]
Summary
The Alpine Ophiolite System (AOC) is exposed along the northwestern and eastern margins of the Yozgat region in Turkey. Mineralization in the Buyukmahal area has not been studied, Derbent and Eymir manganese deposits within the AOC were investigated recently by Oksuz [1, 2]. These deposits were operated from time to time by local miners, but lately none of the deposits is mined out due to low reserve potential. The Eymir manganese deposit which is genetically linked to Buyukmahal mineralization occurs within radiolarite cherts of the lower Cretaceous ophiolite complex [1]. The Derbent manganese mineralization, another manganese deposit in the Yozgat region, occurs as two separate ore bodies [2]. The aim of this study is to discuss the mineralogical and geochemical mechanisms responsible for development of manganese ore in the Buyukmahal area
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