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Distribution, Characteristics and Genesis of Mississippi Valley-type Lead-zinc Deposits in the Triangle Area of Sichuan-Yunnan-Guizhou Provinces

Author: ZhangChangQing
Tutor: MaoJingWen
School: Chinese Geology University (Beijing)
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Metallogenic geological conditions Mineralization age Metallogenic model MVT lead-zinc deposits Yunnan , Sichuan and Guizhou
CLC: P618.4
Type: Master's thesis
Year: 2005
Downloads: 555
Quote: 5
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Abstract


Yunnan , Sichuan and Guizhou is located in the southwestern margin of the Yangtze platform lead-zinc mine area is one of the important lead-zinc germanium silver production base . Have been found , more than 400 in small lead-zinc polymetallic deposit and mine sites . Papers to some typical lead-zinc deposits in the border areas of Yunnan , Sichuan and Guizhou provinces ( Yunnan Huize Lehong Maoping ; the Sichuan Tianbaoshan Daliangzi ; Guizhou cedar forest , horns ponds ) focus on anatomical objects from the depositional environment , magmatic activity and tectonic evolution of the regional geochemical characteristics elaborated mineralization geological conditions . Field geological survey and in-depth study of the indoor test , the dominant mineral in the region - lead-zinc production focuses on the innovative achievements . From the geological characteristics of the deposit and trace elements , stable isotopes , radioactive isotopes , REE geochemistry and fluid inclusions physical chemistry , demonstrated in this area on behalf of the lead and zinc fun red, Huize Tianbaoshan Daliangzi etc. The deposit is a MVT ( Mississippi Valley Type ) lead-zinc deposits . On this basis , the establishment of a model and prospecting model of mineralization of MVT lead-zinc deposits in the area . The main results are as follows: analysis by regional geological background , think the lithofacies paleogeography environment of this area has direct or indirect control of the role of the lead-zinc mineralization ; isotopes , trace elements and REE geochemistry , mineral composition of fluid inclusions and fluid physical and chemical properties of the study show that : lead-zinc deposits in the region into minerals from the sedimentary strata of the era , virtually no involvement of mantle material and magma ; driving force of the ore-forming fluids Paleo-Tethys the subducting tectonic thermal stress and gravity ; mineralization is mainly related to the mixing with the basin brine and deep brine ; altered clay minerals K-Ar isotopic age (176.5 ± 2.5 Ma) reflects the lead-zinc deposits mineralization age Jurassic demonstrated Huize the final mine lead and zinc sulfide mineralization age for early Yanshanian ; Deposits Research , through anatomical analysis of typical MVT lead-zinc deposits , combined with the tectonic evolution and mineralization geological condition characteristics , metallogenic model for MVT lead-zinc deposits in this area .

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