Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   FALL 2007 , Volume 17 , Number 65 (GEOLOGY ISSUE); Page(s) 43 To 58.
 
Paper: 

GEOCHEMISTRY OF BIOTITES IN ALI ABAD- DARREH ZERESHK COPPER PORPHYRY DEPOSITS, YAZD, CENTRAL IRAN

 
 
Author(s):  YAZDI MOHAMMAD*, KHOSHNOUDI KH.
 
* GEOLOGY DEPARTMENT, FACULTY OF EARTH SCIENCE, SHAHID BEHESHTI UNIVERSITY, TEHRAN, IRAN
 
Abstract: 
Darreh-Zerreshk and Ali-Abad are two relatively small porphyry copper deposits in Yazd Province in Central Iran. They are located within the central Iranian volcano-plutonic belt. The deposits are associated with igneous intrusions. The intrusions with Oligocene-Miocene age intruded to Eocene volcano-sedimentary and Cretaceous conglomerates and carbonate rocks. These granitoids, hosted Cu mineralization, were derived from I-type calc-alkaline magma, which are located in syncollisional volcanic arc environment. Biotites from granitoids of the Aliabad-Darreh Zereshk areas are green and brown types. Although, these tow types have different colors under microscope but their chemical compositions are not showing sharp differences. The ratios of 100 (Mg/ (Mg + Fe) vary between 17 and 22. Also, plotting of 100Fet / ( Fet + Mg ) ratio of the studied biotites on a stability diagram correspond to temperature about 600 t0750°C and confirming magmatic origin for these biotites. In addition, biotite composition can be used for discrimination of the granitoid magma. The chemical composition of studied biotites shows that the granitoids of the Aliabad-Darreh Zereshk areas are calc - alkaline I-type.
 
Keyword(s): GEOCHEMISTRY OF BIOTITE, GRANITOID, ALI-ABAD- DARREH ZERESHK COPPER PORPHYRY, YAZD, IRAN
 
References: 
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