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THE CALCULATION OF MASS TRANSFER AND ELEMENT MOBILITY IN SAR-CHESHMEH GRANODIORITE STOCK, KERMAN-IRAN
Abstract
Sar-Cheshmeh porphyry copper deposit, as the biggest copper mine in Iran is located in southwest of Kerman. This deposit is located in southern part of Orumieh – Dokhtar metallogenic belt, which is also the most important copper belt in Iran. The Sar-Cheshmeh granodioritic stock, called “Sar-Cheshmeh Porphyry” is intruded into the Eocene andesitic rocks. This intrusion has caused potassic (first mineralization episode) and phyllic alteration zones in lower levels due to ascending toward the lower temperatures, mixed magmatic and meteoric waters. Therefore, the potassic alteration zone is overprinted by a later phyllic alteration episode. In this paper, based on the graphical method of isocon, mass changes and element mobility within the granodiorite stock have been calculated. The results show that Nb, Zr, Ti and P were relatively immobile during the hydrothermal alteration episodes and their mass conserved alteration. In potassic alteration zone, granodiorite rocks show enrichment of K, Si, S, and depletion of Fe, Mg and Na, Because of the substitution of plagioclase and amphibole by K-feldspar and biotite respectively. Increasing the copper content is due to chalcopyrite crystallization within this alteration episode. During the phyllic alteration, Silica is increasing drastically. It is also an obvious reduction of Na, K, Mg (due to sericitazation of alkali-feldspars and alteration of ferromagnesian minerals) within this alteration zones. Decreasing the copper is also due to copper leaching and subsequence enrichment in supergene alteration in higher the levels.
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References9
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