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Zhongdian Island Arc Magmatic Rock Geochemical Characteristics Of Porphyry Copper Mineralization Study

Posted on:2010-03-14Degree:MasterType:Thesis
Country:ChinaCandidate:X L LiuFull Text:PDF
GTID:2190330332978147Subject:Structural geology
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The article, Arc magmatic rocks geochemical characteristics and porphyry copper deposit metallogeny research, is completed in funding from the subject of the National Basic Research Program of China(973 program):The formation of giant deposits in the preservation and resource potential, which was undertaken by Yunnan Geology Survey.Zhongdian arc located in the southern of Yidun arc of southwest Sanjiang tectonic igneous rock band. Western bounded by Xiangcheng-Geza deep faults, Eastern and southern connected to Ganzi-Litang suture zone and the southwestern edge of the Yangtze plate, It is a product of Ganzi-Litang oceanic crust diving to the Zhongdian Landmass in late Triassic and the importance of China's newly discovered copper-polymetallic metallogenic belt in recent years. The region strong tectonic magmatic activity throughout the island island-arc orogenesis from beginning to end, Rich mineralization developed in the different times and in different circumstances of island arc orogenesis, which ouputed the super-large-medium sized Pulang and Xuejiping porphyry copper-polymetallic deposit in Indosinian, bred the skarn-type polymetallic deposits(Hongshan),and also formed Yanshanian altered granite-hydrothermal quart vein type tungsten, molybdenum medium-sized deposit(Xiuwacu and Relin), constituted porphyry, skarn and epithermal multi-type and multi-minerals copper-polymetallic metallogenic belt.Pulang porphyry copper deposit is typical representative of the Indosinian porphyry copper deposit,that concerned and researched by many scholars at home and abroad in recent years.This paper, Zhongdian island arc magmatic rocks and the Pulang typical porphyry copper deposit, as a object of study, under the guidance of continental dynamics theory and Multi-mineralization theory of island arc and basin, analysised temporal and spatial distribution of of island arc magmatic rocks in Zhongdian based on the geological survey, geochemical characteristics and relations to mineralization. Use the Ar-Ar accuracy dating technology to determine the Zhongdian island arc intrusive rocks in the relationship between spatial and temporal distribution, understanded the different tectonic system structure-distribution and evolution of rock sequences, studied the diagenetic ore-forming epoch and the mineralization process. Adopted the probe rocks and geochemical tracer technology.Through the studying rocks geochemical of different times and different tectonic-magma system, discussed the magma source region, diagenetic mineralization tectonic setting,identified mineralization process of Pulang porphyry copper and geochemical elements'the evolution and distribution of spatial and temporal,and studied the metallogenic model of Zhongdian porphyry copper deposit.
Keywords/Search Tags:Arc magmatic rocks, geochemical characteristics, porphyry copper deposit, Ar-Ar isotopic dating, metallogenic(rock) epoch, metallogenic model, Pulang, zhongdian of Yunnan Province
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