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Bulletin of the Mineral Research and Exploration Bull. Min. Res. Exp. (2018) 156: 137-150 BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION Foreign Edition 2018 156 ISSN: 0026-4563 CONTENTS Holocene activity of the Orhaneli Fault based on palaoseismological data, Bursa, NW Anatolia Bulletin of the Mineral .......................Volkan ÖZAKSOY, Hasan ELMACI, Selim ÖZALP, Meryem KARA and Tamer Y. DUMAN / Research Article 1 The neotectonics of NE Gaziantep: The Bozova and Halfeti strike-slip faults and their relationships with blind thrusts, Turkey ......................................................................................................... Nuray ùAHBAZ and Gürol SEYøTOöLU / Research Article 17 Neotectonic and morphotectonic characteristics of the Elmali basin and near vicinities .............................................................................................................ùule GÜRBOöA and Özgür AKTÜRK / Research Article 43 Syn-sedimentary deformation structures in the Early Miocene lacustrine deposits, the basal limestone unit, Bigadiç basin (BalÕkesir, Turkey) ..................................................... Calibe KOÇ-TAùGIN, øbrahim TÜRKMEN and Cansu DøNøZ-AKARCA / Research Article 69 The effect of submarine thermal springs of Do÷anbey Cape (Seferihisar - øzmir) on foraminifer, ostracod and mollusc assemblages .................................. Engin MERøÇ, øpek F. BARUT, Atike NAZøK, Niyazi AVùAR, M. Baki YOKEù, Mustafa ERYILMAZ, ........................................ Fulya YÜCESOY-ERYILMAZ, Erol KAM, Bora SONUVAR and Feyza DøNÇER / Research Article 89 Palynology of the KÕlçak formation (Early Miocene) from Central Anatolia: Implications for palaeoclimate and palaeoenvironments .................................................................................................... Nurdan YAVUZ and ùükrü Sinan DEMøRER / Research Article 119 Mineralogical ¿ ndings from manganese deposits in the Artova Ophiolite Complex, Derbent-Eymir area, Yozgat, Turkey ....................................................................................................................................................Nursel ÖKSÜZ / Research Article 139 Research and Exploration Petrographic and palynological investigations of Sinanpaúa (Afyon) Miocene coals .......................................................................................................................................................Elif AKISKA / Research Article 153 Separation of geochemical anomalies using inverse distant weighting (IDW) and concentration-area (C-A) fractal modeling based on stream sediments data in Janja Region, SE Iran ............................................................................................Marzieh HOSSEøNøNASAB and Ali Akbar DAYA / Research Article 169 Use of Moran’s I and robust statistics to separate geochemical anomalies in Juirui area (Southeast China) ........................................................................................................................................ Tien Thanh NGUYEN / Research Article 181 Assessment of souil liquefaction using the energy approach ...........Kamil KAYABALI, PÕnar YILMAZ, Mustafa FENER, Özgür AKTÜRK and Farhad HABIBZADEH / Research Article 195 Determination of predominant site period of loose terestrial units (Caliche) by microtremor measurements ...................................................................................................................................................KÕvanç ZORLU / Research Article 207 The Hydrogeological investigation of Plajköy spring (ElazÕ÷) ........................................................... Özlem ÖZTEKøN OKAN, Atahan GÜVEN and Bahattin ÇETøNDAö / Research Article 223 Characterization and dewatering of borax clayey tailings by mono- and dual-À occulants systems .......................................................................................................................................... Nuray KARAPINAR / Research Article 239 The Naúa intrusion (Western Anatolia) and its tectonic implication: A joint analyses of gravity and earthquake catalog data ........................................................................C. Ertan TOKER, Emin U. ULUGERGERLø and Ali R. KILIÇ / Research Article 249 http://bulletin.mta.gov.tr Bulletin of the Mineral Research and Exploration Notes to the Authors ........................................................................................ 261 Mineralogical fi ndings from manganese deposits in the Artova Ophiolite Complex, Derbent-Eymir area, Yozgat, Turkey Nursel ÖKSÜZa* aBozok University, Engineering and Architecture Faculty, Department of Geological Engineering, Yozgat, Turkey. orcid.org/0000-0001-7371-3202 Research Article Keywords: ABSTRACT Artova ophiolite, The Artova Ophiolitic Complex (AOC), which formed in association with Alpine Ophiolites, is manganese oxide, mineralogy, geochemistry, exposed in the NE part of central Anatolia, in the interior of the central Black Sea region and within Yozgat-Turkey. the borders of Çorum and Yozgat. The Derbent-Eymir manganese- oxide deposit under investigation occurs within this ophiolitic complex. The mineral association in Derbent ore is composed chiefl y of pyrolusite, manganite and lesser amounts of ramsdellite, magnetite and goethite. Calcite is the main gangue mineral. The mineral association in Eymir ore is represented by pyrolusite, braunite, neltnerite, jacobsite, psilomelane and trace amount of limonite accompanied by some gangue minerals such as quartz and calcite. Electron microprobe analysis was carried out on pyrolusite, braunite and psilomelane minerals. While pyrolusite from Eymir has higher Si, Al, Mn and Ca, pyrolusite from the Derbent ore has lower Fe, K and Ba contents. Pyrolusite in the Eymir ore has higher Si, Al, Mn and Ca (10.28-7.06; 3.19-1.28; 87.98-81.88; 2.38-1.97 respectively) and lower Fe, K and Ba (0.31-0.16; 0.02-0.00; 0.07-0.00 respectively) contents in comparison to pyrolusite in the Derbent ore. Element variations in core-rim zones of spherical pyrolusites and manganite crystals elongated towards the gangue are quite noticeable. Both Eymir and Derbent ore deposits are low-temperature hydrothermal deposits. Geochemical variations recorded in various manganese minerals are found to be strongly Received Date: 21.02.2017 dependent on the changes in pH and temperature of the ore-forming solution and distance to the Accepted Date: 16.10.2017 spreading center. 1. Introduction the continental fragments and is a part of the Alpine- Himalayan orogenic system (Okay and Tüysüz, Turkey comprises an E-W trending component 1999). The manganese deposits in Derbent and Eymir of the Alpine-Himalayan orogenic belt which occurs (Yozgat) regions formed syngenetically associated at the border between Laurasia to the north and with radiolarites in the Alpine ophiolite. Gondwana to the south. The Alpine-Himalayan orogenic system was formed by the closure of different The present work focuses on the mineral branches of the Tethys Ocean. During the closure paragenesis and geochemistry of manganese deposits in of the Tethys Ocean, various continental fragments the Derbent and Eymir (Yozgat) areas. The manganese of Laurasia and Gondwana collided. The land of deposits are located 30 km NW and 80 km NE of Anatolia has been shaped as an orogenic collage Yozgat city, respectively. According to geological, which is composed of these continental fragments mineralogical and geochemical data (major, trace and and the relict oceanic materials (radiolarian chert, REE), the Derbent manganese deposit was formed basalt, pelagic shale, pelagic limestone, sandstone by both hydrothermal and hydrogenous-diagenetic and serpentinite) between them (Okay and Tüysüz, processes (Öksüz 2011a). The Eymir deposit was 1999). The Artova Ophiolitic Complex (AOC) is one stated to be a volcanosedimentary type deposit where of the ophiolites tectonically sandwiched between hydrothermal and hydrogenous processes exerted * Corresponding author: Nursel ÖKSÜZ, [email protected] http://dx.doi.org/10.19111/bulletinofmre.334245 137 Bull. Min. Res. Exp. (2018) 156: 137-150 primary control (Öksüz, 2011b). Although Derbent serpentinites. Based on fossil assemblages recorded and Eymir deposits are of the same type, their mineral in the sedimentary units, the emplacement age of the associations are quite different. Thus, this work ophiolite was dated to the Upper Cretaceous-Paleocene focuses on the examination of the geochemical and (Özcan et al., 1980). The lower Eocene sedimentary mineralogical variations in the Derbent and Eymir sequences in this region comprise turbidites which manganese deposits in order to infer which processes or conform to the upper Cretaceous rocks. The basal factors were responsible for the observed differences. conglomerate of the Lutetian unconformably overlies For this, the mineralogy of the ores was thoroughly the lower Eocene units and partly the ophiolitic series. examined (ore microscopy, X-ray diffraction, Raman The lower Eocene units are characterized mostly by spectroscopy and electron microprobe analysis) and thick fl ysch layers, and lava and tuffs deposited in a ore paragenesis and structural-textural relations were shallow marine environment. The Lutetian volcanic determined. series consists of lava including agglomerate, tuffs and tuffi tes of basaltic and andesitic composition. The 2. Geological Setting upper Cretaceous and Lutetian units in the study area are the products of submarine volcanism (Özcan et The lithologic units in the
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