Geological, mineralogical and fluid inclusion characteristics of auriferous quartz veins at Guneykoy (Usak, Esme), Western Turkey
[ X ]
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
E Schweizerbartsche Verlagsbuchhandlung
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Auriferous quartz veins of Guneykoy (Usak, Esme) are hosted in Precambrian greenschist facies granitic gneisses of the Menderes Massif, West Anatolia. The auriferous quartz veins occur as fissure fillings either discordant or parallel to the foliation of the gneiss. The ore mineralogy includes arsenoyprite, pyrite, ilmenite, hematite and rutile as well as trace amounts of limonite, chalcopyrite and covellite. Arsenopyrite is a main ore mineral and often transformed into scorodite along crystal boundaries and fractures. Pyrite occurs within fractures of arsenopyrite and /or between the arsenoyprite crystals. Some pyrite is transformed into marcasite. The grain size of Au is 30-100 mu m, it occurs as single crystal or as aggregates in arsenopyrite. The Au content of the ore sample lies between 7.3 and 10 ppm; Ag varies between 0.9 and 20 ppm; Ni between 20 and 156 ppm; Cu between 9.0 and 14.1 ppm; Pb between 16.4 and 364 ppm and Zn between 2 and 5 ppm. The delta S-34 values of scorodite vary from -3.7 to 10.6 parts per thousand CDT and these values indicate that sulfur in the hydrothermal solution was not mainly derived from a magmatic source or through dissolution and leaching of pre-existing sulfide bearing igneous sources. Fluid inclusion studies on quartz yield homogenization temperatures of the fluids between 270 and 440 degrees C and salinities between 3.4 and 16.6 wt.parts per thousand NaCl equivalent. The low NaCl values may indicate mixing of low salinity meteoric fluids and magmatic fluids. As a result, the Guneykoy gold deposit originated from a metamorphic fluid system related to the Pan-African orogeny characterized by low salinity and enrichment of CO2. Based on geological features, mineral paragenesis and fluid-inclusion studies, the Guneykoy gold mineralization can be classified as orogenic gold-type deposits.
Açıklama
Anahtar Kelimeler
Au, Auriferous Quartz Veins, Menderes Massif, Guneykoy, Western Anatolia
Kaynak
Neues Jahrbuch Fur Mineralogie-Abhandlungen
WoS Q Değeri
N/A
Scopus Q Değeri
Q4
Cilt
195
Sayı
1
