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

Year 2018, Volume: 39 Issue: 3, 155 - 176, 27.12.2018
https://doi.org/10.17824/yerbilimleri.503711

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.

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Year 2018, Volume: 39 Issue: 3, 155 - 176, 27.12.2018
https://doi.org/10.17824/yerbilimleri.503711

Abstract

References

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  • Genç Y, Türkmen H, Coşkun E, Çamaşırcıoğlu A, Aydınlı I and Demiray B., 2003. Çayağzı-Terziali (Kırşehir) gold mineralization: the first example of unconformity-related gold mineralisations in the Kırşehir Metamorphic Massif, 56th Geological Congress of Turkey, Extended Abstracts Book, 120-121.
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  • Genç Y., 2004. Savcılı migmatite-dome hosted gold-quartz veins in Kırşehir Metamorphic Core Complex (KMCC), central Anatolia, Turkey. In: Chatzipetros AA and Pavlides SB (eds.), Proceedings vol. 3: 1394-1397. 5th International Symposium on Eastern Mediterranean Geology, Thessaloniki, Greece, 14-20 April 2004.
  • Genç Y and Yürür T., 2004. The Kırşehir detachment faulting and a new interpretation of the “Savcılı Thrust Zone” in central Anatolia, Turkey. In: Chatzipetros AA and Pavlides SB (eds.) Proceedings, vol. 1: 73-76. 5th International Symposium on Eastern Mediterranean Geology, Thessaloniki, Greece, 14-20 April 2004.
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  • Goldfarb RJ, Phillips GN and Nokleberg WJ ., 1998. Tectonic setting of synorogenic gold deposits of the Pacific Rim, Ore Geology Reviews 13: 185-218.
  • Göncüoğlu MC., 1986. Geochronological age data from the southern part of the central Anatolia Massif. Bulletin of Mineral Research and Exploration Institute of Turkey 105/106: 111-124 (in Turkish).
  • Göncüoğlu MC, Toprak V, Kuşçu İ, Erler A and Olgun E ., 1991. The geology of the western part of the central Anatolia Massif, chapter 1: Southern part. National Oil and Gas Company of Turkey, Report No: 2909, 140pp (in Turkish with English abstract).
  • Groves DI., 1993. The crustal continuum model for late-Archean lode gold deposits of the Yilgarn Block, Western Australia. Mineralium Deposita 28: 366-374.
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There are 76 citations in total.

Details

Primary Language English
Subjects Engineering
Journal Section Articles
Authors

Yurdal Genç

Mehmet Tekin Yürür

Publication Date December 27, 2018
Submission Date September 3, 2018
Acceptance Date November 24, 2018
Published in Issue Year 2018 Volume: 39 Issue: 3

Cite

EndNote Genç Y, Yürür MT (December 1, 2018) Savcılıebeyit (Kaman-Kırşehir) Gold Mineralization and Its Genetic Relationship With Post-Collisional Exhumation and Extensional Tectonics in Central Anatolia, Turkey. Yerbilimleri 39 3 155–176.