Savcılıebeyit (Kaman-Kırşehir) Gold Mineralization and Its Genetic Relationship With Post-Collisional Exhumation and Extensional Tectonics in Central Anatolia, Turkey

Authors : Yurdal Genç, Mehmet Tekin Yürür

Pages : 155-176

Doi:10.17824/yerbilimleri.503711

View : 11 | Download : 8

Publication Date : 2018-12-27

Article Type : Research

Abstract :     Gold exploration works in central Anatolia, Turkey, were intensified during the last decade, and potentially important gold mineralizations  were discovered. In the region, important gold discoveries hosted by metamorphic and granitic rocks are, in the  west, Savcılıebeyit and Terziali (Kırşehir), in the middle part, Himmetdede and Mahmatlar (Kayseri), Akçataş (Nevşehir), and at the  south-east , Gümüşler (Niğde) mineralizations. The Savcılıebeyit gold mineralization consists mainly of gold-quartz veins, and is the first  discovered gold enrichment hosted by metamorphic rocks of west-central Anatolia. These veins are situated at the  south-eastern  margin of the Cefalıkdağ-Baranadağ granite-migmatite dome, at 60 km west of the city of Kırşehir. In this study, preliminary  results of geological and structural investigations of the gold-quartz veins are presented.       The study area is part of the Palaeozoic-Mesozoic Kırşehir Massif that comprises mainly high-grade metamorphic and plutonic  rocks covered by Cenozoic sediments. The gold-quartz veins are hosted by migmatite, migmatitic gneiss, gneiss-schist-marble  intercalations, calc-silicate gneiss and marble. Quartz veins are discordant with respect to the foliation and major lithologic  boundaries, and have sharp contacts with the enclosing metamorphic wall rocks. Veins occur as single or composite, relatively  continuous veins that are up to about 2 km long and extend for at least 200 m down dip. Their thickness ranges from a few  millimetres to two metres.      The gold-quartz veins consist mainly of quartz, arsenopyrite, pyrite and secondary haematite and limonite. Other common  minerals in the veins are calcite, muscovite, biotite,  chlorite  and epidote. The distribution of gold is erratic, and only weathered, haematite- and limonite-rich parts of the veins near the surface consistently display higher gold contents.  Homogenisation temperatures obtained from fluid inclusions in the quartz vein have a wide range, from 160˚C to well above  400˚C. The fluid inclusions are generally rich in carbon dioxide and also have high salinities (20-33 % NaCl equivalent).  The gold-quartz veins have many similarities to orogenic gold deposits in terms of metal associations, wall-rock alteration  assemblages, mineralogy, formation conditions and structural control. The spatial association of the veins with migmatites,  high-grade metamorphic rocks and granitoids suggests an origin related to metamorphism, uplift and/or migmatite doming and  granitoid emplacement in central Anatolia.
Keywords : Granitoid-migmatite doming, Kırşehir Massif, orogenic gold deposit, Turkey