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Geological And Geochemical Characteristics Of MVT Pb-Zn Deposits And Resources Potential Assessment In Songzhong-Ranwu District, Eastern Tibet

Posted on:2007-05-07Degree:DoctorType:Dissertation
Country:ChinaCandidate:K L ChenFull Text:PDF
GTID:1100360185469928Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
Songzhong-Ranwu district located in eastern area of Tibet, which is belongs to the middle-south sub-plate of the Gangdishi-Nianqintanggula tectonic plate geologically. From this area towards east direction is the River Nujiang, and to the west is the River Yaluzhangbu., The research work of this PhD thesis is based on many works from the project both in the field and the analytical results. The project for mineral resource potential assessment in Songzhong-Ranwu district, financially supported by China Geological Survey, has been carried out from the year of 2000 to 2002. The greatest achievement during that time is Salonglong and Duoyilongba MVT Pb-Zn deposits have been found. The geological setting of mineralization has already shown that the study area would be an important and new area of lead and zinc resource.This PhD thesis studied carefully on geological characters of Salonglong and Duoyilongba Pb-Zn deposit firstly. The following works mainly focused in relations between the regional strata and mineralization. Metallogenetic process is quite differing from the stratigraphies. The carbonates of Songzhong formation ( Middle-Upper Devonian to Lower Carboniferous) not only provides the materials for ore-deposit, but also is the host rock. Especially, the dolomite of the carbonate rocks in the formation is most important. The carbonate formation is the cap-rock of the ore-forming fluid as well. The stratigraphy was one of important factor to control the Pb-Zn deposits in the metallogenetic process. But, the tectonic faults were the most important one to control the mineralization. The tectonic shear zones, such as Bakang-Malachi (F1) and Elulongba (F2) control the mineralization type, and the regional tectonic, such as Balong-Yubu, Yubu-Bilong and Xiulazhe-Zhongsha etc are the leading tectonics; and control the shape of ore-bodies. According to the analytical results of the trace element, rare earth element, and S, Pb, H, O isotopic data, the thesis have concluded that the ore-forming substances came from the carbonate rocks and the water in hydrothermal fluid was derived from...
Keywords/Search Tags:Songzhong strata of Devonian, MVT Pb-Zn deposit, Metallogenetic mechanism, GIS resources prediction
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