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Geological Characteristics and Genesis of Polymetallic Copper Deposit of Jiama, Tibet

Author: LiYongSheng
Tutor: YanGuangSheng；LvZhiCheng
School: Chinese Geology University (Beijing)
Course: Mineral prospecting and exploration
Keywords: Jiama copper polymetallic deposit Alteration zoning Ore-forming fluids Sources of metals Genesis
CLC: P618.41
Type: Master's thesis
Year: 2009
Downloads: 92
Quote: 4
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Abstract


The Gangdise epicontinental volcanic - magmatic arc Tibet Jiama copper polymetallic deposit is located , positioned in an arc of Mesozoic sedimentary basins ( Jiama - day multi- basin ) , bring typical skarn mineralization Gangdese - porphyry copper polymetallic deposit . Full collection and careful study of previous data based on , and a lot of field work , the integrated use of structural geology , petrology , mineralogy , mineral deposit geology , geochemistry , fluid inclusions geology and isotope geology multidisciplinary theories and methods that : orebodies are mainly distributed in the skarn orebodies layered stratiform , lenticular output distribution in the upper part of the upper Jurassic multi bottom ditch group Lower Cretaceous reunification group Limbu cases , the site of contact ; ore minerals are chalcopyrite , bornite , galena , sphalerite , pyrite , molybdenite , native sulfide mainly accounted for 95 of the total amount of ore minerals % or more; gangue minerals garnet , diopside stone skarn mineral - based ; wallrock alteration skarn , marble , silicification , hornfels of mineralization is most closely related , the level and the vertical alteration zoning phenomenon is significantly stronger regularity ; hydrogen and oxygen isotope studies have shown that in the dry skarn rocks stage ore-forming fluids mainly metamorphic and magmatic water after precipitation and organic water mixed ; wet skarn precipitation , and in the late stage of ore-forming fluids in magmatic water main ; ore lead isotopes , sulfur isotopes , rare earth elements results show that the ore metals mainly derived from a mantle source or thickening of the lower crust ; fluid inclusions the body of research shows that the Jiama copper polymetallic deposits belong to the high-temperature hydrothermal deposits , part of the fluid inclusion homogenization temperatures above 500 ° yet uniform , the introns fluid inclusions is more developed , high salinity , identified mineralization physical and chemical conditions . Finally , through the study of the geological characteristics and ore deposit geochemistry , restating the genesis of this deposit type . Hope to play an important role in the theoretical guidance of the work of prospecting , prospecting and predict the next step in this area .

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals > Copper
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