Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Yazarlar: Sinan ALTUNCU, Ali TÜMÜKLÜ, F. Zafer ÖZGÜR

Konular:Mühendislik

DOI:10.28948/ngumuh.502269

Anahtar Kelimeler:Niğde Massif,Üçkapılı Granitoid,Iron,Lead-Zinc,Hydrothermal.

Özet: Nigde Massif is the southest part of the CACC (Central Anatolian Crystalline Complex) which is composed of magmatic and metamorphic rocks. In the study area, formations of Nigde Group are Gumusler Formation which is composed mainly of gneiss and marble, Kaleboynu Formation which is composed of marble, gneiss and amphibolite, Asigedigi Formation which is composed of marble, gneiss and amphibolite, Sineksizyayla Metagabbro and Uckapili Granitoid. Sineksizyayla Metagabbro intrude the Gumusler and partly Kaleboynu Formations. Uckapili Granitoid cuts all the other units. Nigde Massif is covered by Early Pliocene Incesu Ignimbrite and Quaternary alluvium.    Hydrothermal iron mineralizations located in the Nigde Massif are in the form of veins, veinlets and pocket filler in the marbles and schists. These iron mineralizations have settled as chimneys, rising to the surface in some places (Armutbeli). It is observed in the microscopic investigations that mineralizations show 3 separate features. These are: 1-       Lepidocrocites having radial, needle-like and fibrous structures, 2-       Aciniform goethites showing rhythmic alternation structures, 3-       Pyrite, chalcopyrite (malachite) and ores containing small amounts of native Cu and Au cutting these FeO minerals as veins and droplets.    In geochemical investigations, Fe2O3 values of 15 iron ore samples in the Niğde Massif were found between 15.49% and 96.88% (average 66.28%), and Pb values were between 1.42% and 10% in 7 samples (average 4.09%), Zn values were between 0.43% -30.18% in 7 samples (average 13.49%), Sb values were 28.44% -31.45% in 2 samples (average 29.95%). 

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