江西朱溪铜钨矿细粒花岗岩LA-ICP-MS锆石U-Pb定年和岩石地球化学研究  

LA-ICP-MS Zircon U-Pb Dating and Petrologic Geochemistry of Finegrained Granite from Zhuxi Cu-W Deposit, Jiangxi Province and Its Geological Significance

作　　者：王先广[1] 刘战庆[2,3] 刘善宝[2] 王成辉[2] 刘建光[4] 万浩章[4] 陈国华[4] 张树德 刘小林 

机构地区：[1]江西省国土资源厅,江西南昌330025 [2]中国地质科学院矿产资源研究所,北京100037 [3]桂林理工大学地球科学学院,广西桂林541004 [4]江西省地质矿产勘查开发局912大队,江西鹰潭335001 [5]崇义章源投资控股有限公司,江西崇义341300

出　　处：《岩矿测试》2015年第5期592-599,共8页Rock and Mineral Analysis

基　　金：江西省国土资源厅地质勘查基金(矿[2012]01-06);中央地质勘查基金(2013360010);国土资源部公益性行业科研专项(201411035);中国地质大调查项目--我国重要矿产和区域成矿规律研究(12120106633903)

摘　　要：江西朱溪铜钨矿床是近年来在赣北地区发现的又一超大型矽卡岩型钨矿,矿床的形成与花岗岩类侵入体密切相关,矿区处于钦—杭结合带江西段塔前—赋春成矿带中部。该矿床的发现进一步证明了研究区建立的"南钨北扩"格局,然而前人对其成矿岩浆岩地球化学特征及侵入时代缺少必要的研究,直接制约了对这一格局的深入认识。本文选择朱溪铜钨矿区与成矿有关的细粒白云母花岗岩作为研究对象,结合详细野外地质工作和前人研究成果,首次采用LA-ICP-MS锆石U-Pb定年方法获得了该岩体中锆石206Pb/238U加权平均年龄为146.90±0.97 Ma(MSWD=0.55);并利用X射线荧光光谱和ICP-MS技术进行岩石地球化学分析,结果显示该岩体具有高硅、高碱、富钾、强过铝质的地球化学特征,属于典型的S型花岗岩,说明晚侏罗世早期在江南隆起一带存在一期与成矿作用有关的岩浆侵位事件,为研究朱溪超大型铜钨矿和区域上塔前—赋春成矿带成矿规律研究提供了新证据。Zhuxi W-Cu deposit in northern Jiangxi Province is a recently found super large skarn W deposit. The formation of this deposit is closely related to granitic intrusions. The mining area is located in the central Jiangxi Taqian-Fuchun ore belt in Qin（ zhou）-Hang（ zhou） joint zone. The discovery of this deposit is further evidence for the model of the Southern tungsten North expansion. However,due to the lack of systematic geochemistry and geochronology of ore-related intrusions,the knowledge of this model is limited. Ore-related fine-grained muscovite granite was chosen as the research object for the study reported on in this paper. LA-ICP-MS zircon U-Pb dating of granite yielded a206 Pb /238 U weighted average age of 146. 90 ± 0. 97 Ma（ MSWD = 0. 55）. These granitic rocks have high silicon,alkali and potassium,and are strongly peraluminous,which belongs to the typical S-type granite. This study has indicated that ore-related magmatism occurred at the late Jurassic in Jiangnan uplift and provides new evidence for the genesis of Zhuxi W-Cu deposit and metallogenic regularity of the Taqian-Fuchun metallogenic belt.

关 键 词：江西朱溪铜钨矿 花岗岩 岩石地球化学 LA-ICP-MS锆石U-PB测年 

分 类 号：P597.3[天文地球—地球化学] P588.121[天文地球—地质学]