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THE CALCULATION OF MASS CHANGES WITHIN THE ANDESITIC ROCKS AT SAR-CHESHMEH PORPHYRY SYSTEM
Abstract
The Sar-Cheshmeh granodioritic stock, called “Sar Cheshmeh Porphyry”, is intruded into the Eocene andesitic rocks. This intrusion has caused potassic (biotitic) and propylitic alteration zones in peripheral rocks. Potassic alteration zone is overprinted by a phyllic alteration zone, which is occurred by heated meteoric waters that affected primary alteration zones. About half of the copper mineralization in Sar- Cheshmeh has occurred in potassically and phyllically altered andesitic rocks. In this paper, mass change calculations and element mobility in phyllic and potassic alteration zones within the andesitic rocks have been calculated by isocon plot methods. The results show that Nb, Zr and Y were relatively immobile during hydrothermal alteration episodes and their mass conserved alteration. In potassic (biotitic) alteration zone, andesitic rocks show enrichment of K, Fe, Ca, Mn, Mg, Na and depletion of Si, Al. Because of occurrence of chalcopyrite and some bornite, the Cu content of the rocks is added during this alteration zone. In phyllic alteration, an obvious enrichment of Si and addition of Fe, Mn, Ca and depletion of Al, Mg, K, Na is caused by widespread silicification of rocks and sericitization of alkali-feldspars and destruction of ferrromagnesian minerals.
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References11
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