Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (5): 1491-1504.doi: 10.13278/j.cnki.jjuese.20190284

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Geochemistry, Geochronology and Genesis of Granites in Shihuoshan Pyrite Polymetallic Ore Area, South Jiangxi Province

He Genwen1, Lu Siming2, Peng Linlin1, Yu Changqi1, Li Wei1, Liu Cuihui1   

  1. 1. Gannan Geological Survey Group, Bureau of Geology and Mineral Resources of Jiangxi Province, Ganzhou 341000, Jiangxi, China;
    2. College of Resources, Environment and Jewelry, Jiangxi College of Applied Technology, Ganzhou 341000, Jiangxi, China
  • Received:2019-12-18 Online:2020-09-26 Published:2020-09-29
  • Supported by:
    Supported by Projiect of China Geological Survey (DD20190159-22), Key R & D Program of China (2016YFC0600208) and Science and Technology Project of Jiangxi Provincial Department of Education (GJJ191351)

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Abstract: Shihoushan ore deposit is the largest skarn-type pyrite polymetallic ore deposit in Jiangxi Province,which is associated with tungsten, copper and gold ore-forming elements, and related to the nearby Chashanjing composite granites. The granites mainly include two periods: Chashanjing porphyritic biotite monzonitic granite and Lianhu fine monzonitic granite. In order to study the emplacement age, petrogenesis,and relationship with mineralization, the U-Pb zircon dating, petrography,and rock geochemistry were tested and analyzed. The results show that the intrusive rocks are characterized by high silicon, potassium, and aluminum, belonging to the high-K calc-alkaline series granites; the fractionation of rare earth elements is obvious in right-wing type, with weak Eu negative anomaly, enrichment of Cs, Rb, Th, U and Pb, depletion of Ba, Nb, Sr and Ti, the feature of low Ba-Sr crust derived granites. The U-Pb zircon dating by LA-ICP-MS yields the concordant age of (162.4 ±0.6) Ma (MSWD=1.8), and the weighted average age of (162.4 ±1.4) Ma (MSWD=1.4), these two are highly consistent within the error range, which implies that the Chashanjing composite granite was emplaced in Middle Jurassic of Early Yanshanianan. Considering the mineral assemblage, major and trace elements and high fractionation characteristics, it is considered that the rock mass belongs to S-type granite. In comparison with ordinary Chinese granites, Chashanjing granites are obviously rich in metallogenic elements such as W, Mo, Bi, and Pb, which might have provided heat, fluid, and material for the mineralization.

Key words: petro-geochemistry, zircon U-Pb age, Shihoushan pyrite ore deposit, Early Yanshanian granite

CLC Number: 

  • P597.3
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