TN148 :
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2011
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Abstarct: Dalli porphyry Cu-Au mineralized system consists of two anomaly area, One in the south and the other in the north, Geochemical modeling of the anomaly areas is one of the objective of this thesis. In the current research, exploration data includes of remote sensing, Geochemical, Geophysical result (magnetic and geo electric (IP/Rs)) and geological data was used. Results of remote sensing and geophysical interpretation were used in the research. According to the analysis of the core samples, the average of Au and Cu grade in the south anomaly are 0.71 ppm and 0.53 %, and in the north anomaly include of 0.48 ppm and 0.15 %, respectively.
There is a good correlation between magnetic anomaly and potassic, phyllic and silicified alteration zones. Accompany with the mineralized area in the study area. Study of drilling cores separated three zones of oxidized, transition and hypogene baxsed on of Au and Cu concentration. In the oxidized zone some minerals such as malachite is predominant minerals, which is not exist in the two other zones. Pyrite, chalcopyrite, bornite and magnetite is the predominant minerals in the transition and hypogene zones that are not available in the oxide zone. Olygiste separate the boundary between transition and hypogene zones. An increase in the concentration of Cu and S at the end of transition zone might be interpreted as product of leaching from oxide and transition zones. There is a relative depletion in the Bi and Mo values, but no specific geochemical reflection in the Mn, Mg, Ni concentration in the mineralized zone. baxsed on the geochemical behavior of the different elements, different exploration ratios such as S/Ba , Cu/Sc and Au/Zr in the hypogene zone, S/Ti in the transition zone and Mn/Se , Fe/La in the oxide zone were proposed. These ratio were used to in identify and separate the mineralized and alteration zones.
Combination of the geophysical (IP/Rs and magnetic) models with geochemical distribution haloes were led to identification of mineralization zones exploration characters. The corresponding zone was separated by high induced polarization (IP) and low resistivity (Rs) baxsed on the pyrite and chalcopyrite minerals. In this zone potassic alteration accompany with magnetite mineral and high magnetic anomaly. The geochemical models were identified the mineralized zone by relative enrichment of S , Co, Fe, Pb and relative depletion of Bi and La.
Finally, baxsed on the whole exploration data and three dimensional model the follow up exploration drilling were propose.
Keywords:
#Dalli #geochemical model #exploration ratios #exploration characters Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
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