Jeoloji Münendisliği Dergisi

Mineralogical and genetic study of iron deposits of the Çifiehan-Koçak (UlukışlalNiğde) district

ABSTRACT: The iron ore deposits in the studied area appear in the Elmalı volcanite member or at the contact between this vulcanites and Aktaştepe limestone member of the Upper Senonian-Paleocene aged Çiftehan complex. The dominant mineral, of the iron deposits is magnetite. Magnetite is accompanied in lesser or trace amounts by chalcoyprite» cobaltite, pyrite, bravoite, linnaeite, bornite» millerite, sphalerite, galena, ilmenite» rutile» sphen, anatas, hematite, neodiganite, braunite, oovellite, native gold/electrum, clabrodite, bismutinite and aikinite, `The common gangue mineral is epidote,. Quartz, garnet, pyroxene, amphibol, clorite, cordierite, actinolite and tremolite are the other observed gangue minerals. Ore mineralization can be divided five phases according to cross-cutting, replacement and seperation on inclusion features of the minerals. The iron deposits occuring in scam zones are of contact-metasomatic origine. The mineralization is due to solution derived from plutonic rocks with monsonitic and dioritic compositions. The age of the iron ores is Upper Senonian-Paleocene. The total reserve of the iron deposits in the area is about 200 0001.