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Research On The Geological And Geochemical Characteristics And Genesis Of Lead-Zinc Deposit In Danzhou, Hainan Province

Posted on:2012-01-19Degree:MasterType:Thesis
Country:ChinaCandidate:Y H S OuFull Text:PDF
GTID:2120330335490036Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
The Nanjiang lead-zinc deposit is located in WuZhishan fold belt of Southern China foldzone, belong to Hainan mining area of Guangdong-Hainan metallogenic belt and lies in Danzhou-Baisha fault zone which is in south of Wangwu-Wenjiao deep fault.According to collecting systematically research datas and relevant literatures, monographs and research reports of study area, based on knowing well and grasping the basis of mining geological features, using the latest research results of metallogeny and through of comprehensive research of field geological investigation, mineral deposit geology and mineral petrology, ore-forming tectonics and geochemical (major elements, trace elements and rare earth elements), discusses the geochemical characteristics of mining area and probes into the causes of the ore deposit.The Nanjiang lead-zinc veins distributed in crystallization limestone of the Kongliecun group of lower silurian system with "lens shape"and "pulse shape". Sphalerite and Galena are the main metal mineral of ore. The prior structures of mineral are granular mosaic and dyeing shape structure. The main ore tectonics are massive and strap.By silicate analysis, trace elements and rare earth elements test etc, the paper studys the granites, surrounding rocks and ore geochemical characteristics in the mining area, thinks Coarse-grained biotite granites near the ore bodies are closely related to mineralization. The granites belong to strongly peraluminous granitoid series. Granites are formed in the post-collisional stage of the tensile built rock type.The writer considers that the Nanjiang lead-zinc deposit formed through the early depositional enrichment and late stage superimposed magmatic hydrothermal mineralization in two phases, is produced in the genesis of the carbonate rocks and magmatic hydrothermal mineralization formed mainly due to complex into a multi-lead-zinc deposits. The limestone of the ore area formed ore embryo through the time the deposition and metamorphism which provides a good metallogenic setting for enrichment of lead-zinc deposit. Frequent activities of the magma forming fluid temperature, flow and repeated circulation, making the metallogenic elements to be dissolved out of limestone, prompting "embryo mine" dissolved, activation and transported of the first mineralization stage. Due to the low pressure of a crack in the limestone, lead and zinc precipita and enrich in the crack of the limestone. With the many resurrection of tectonic, hydrothermal role has been strengthened, outside metallogenic material superimposed on top of earlier one and make the ore further enriched, ultimately form lead-zinc body.
Keywords/Search Tags:Nanjiang lead-zinc, geochemistry, ore genesis, granites
PDF Full Text Request
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