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粤西大金山钨锡多金属矿床地质特征及成岩成矿年代学研究
引用本文:余长发,毛景文,赵海杰,陈懋弘,罗大略,郭敏.粤西大金山钨锡多金属矿床地质特征及成岩成矿年代学研究[J].岩石学报,2012,28(12):3967-3979.
作者姓名:余长发  毛景文  赵海杰  陈懋弘  罗大略  郭敏
作者单位:中国地质大学地球科学与资源学院, 北京 100083;中国地质大学地球科学与资源学院, 北京 100083;中国地质科学院矿产资源研究所, 北京 100037;中国地质科学院矿产资源研究所, 北京 100037;中国地质科学院矿产资源研究所, 北京 100037;广东省地质调查院, 广州 510080;广东省地质调查院, 广州 510080
基金项目:本文受国家重点基础研究发展计划973项目(2012CB416704)和中国地质调查局地质调查工作项目(1212011120831)联合资助.
摘    要:粤西大金山钨锡多金属矿是一个近年新发现的与花岗岩有关的石英脉型钨锡多金属矿,目前估算的资源量已达中型,并具有大型矿床的找矿潜力。矿体形态简单,主要以石英脉的形式产出,由石英脉、云英岩脉和多金属硫化物石英脉等组成。钨锡多金属矿化的主要类型为细脉状和网脉状,围岩蚀变主要有硅化、云英岩化和绿泥石化等。本文在详细介绍矿床地质特征的基础上,对矿床进行了成岩成矿年代学研究。采用LA-MC-ICP-MS锆石U-Pb测年技术,得到了花岗岩的成岩年龄:中细粒黑云母花岗岩形成于82.89±0.35Ma~85.6±0.52Ma,似斑状黑云母花岗岩形成于75.01±0.16Ma~84.17±0.34Ma。通过对与中细粒黑云母花岗岩有关的5件石英脉型辉钼矿进行Re-Os同位素分析,获得其模式年龄为80.07±1.19Ma~84.93±1.42Ma。以上年代学测试结果说明大金山钨锡多金属矿成岩成矿时代为晚白垩世,成岩成矿作用基本同时。本文认为大金山钨锡多金属矿成岩成矿作用发生在华南晚中生代岩石圈拉张-伸展的构造背景下,是华南晚中生代大规模成岩成矿作用的产物。

关 键 词:LA-MC-ICP-MS定年  Re-Os年代学  大金山钨锡多金属矿  粤西
收稿时间:7/1/2012 12:00:00 AM
修稿时间:2012/10/16 0:00:00

Geological characteristics and ages of granites and related mineralization in the Dajinshan tungsten-tin polymetallic deposit, western Guangdong Province
YU ZhangF,MAO JingWen,ZHAO HaiJie,CHEN MaoHong,LUO DaLue and GUO Min.Geological characteristics and ages of granites and related mineralization in the Dajinshan tungsten-tin polymetallic deposit, western Guangdong Province[J].Acta Petrologica Sinica,2012,28(12):3967-3979.
Authors:YU ZhangF  MAO JingWen  ZHAO HaiJie  CHEN MaoHong  LUO DaLue and GUO Min
Institution:School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Guangdong Geologic Survey Institute, Guangzhou 510080, China;Guangdong Geologic Survey Institute, Guangzhou 510080, China
Abstract:The Dajinshan tungsten-tin polymetallic deposit in western Guangdong Province is a quartz vein type ore deposit related to granitoids. The ore bodies show a fairly simple shape and mainly occurred as tungsten-tin polymetallic-bearing sulfide quartz veins, including quartz vein, quartz-greisen and sulfide-quartz veins. The main ore types include veinlets and stockworks. The major wall rock alterations include silicification, greisenization and chloritization. In this paper, we present detailed geologic features of the deposit and carry out zircon LA-MC-ICP-MS U-Pb ages for the ore-bearing granitic rocks in the deposit. Zircon U-Pb dating yields ages of 82.89±0.35Ma to 85.6±0.52Ma for the medium to fine grained biotite granite, and 84.17±0.34Ma to 75.01±0.16Ma for the porphyritic biotite granite, respectively. Precise Re-Os dating of molybdenite from the quartz veins related to the medium to fine grained biotite granite in the Dajinshan tungsten-tin polymetallic deposit has also been carried out in this study. The results show that the Re-Os model ages of five samples range from 80.07±1.19Ma to 84.93±1.42Ma. These dating results suggest that the timing for the W-Sn mineralization and granite intrusion are simultaneous, which is corresponding to the period of the large-scale mineralization in the Late Mesozoic in the South China, under a tectonic setting of crust extension system.
Keywords:LA-MC-ICP-MS zircon U-Pb dating  Molybdenite Re-Os dating  Dajinshan tungsten-tin polymetallic deposit  Western Guangdong Province
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