赣南狮吼山硫铁多金属矿区花岗岩地球化学、年代学特征及其成因

doi:10.13278/j.cnki.jjuese.20190284

吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1491-1504.doi: 10.13278/j.cnki.jjuese.20190284

• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇下一篇

赣南狮吼山硫铁多金属矿区花岗岩地球化学、年代学特征及其成因

贺根文¹, 路思明², 彭琳琳¹, 于长琦¹, 李伟¹, 刘翠辉¹

1. 江西省地质矿产勘查开发局赣南地质调查大队, 江西赣州 341000;
2. 江西应用技术职业学院资源环境与珠宝学院, 江西赣州 341000

收稿日期:2019-12-18 出版日期:2020-09-26 发布日期:2020-09-29
通讯作者: 路思明(1987-),女,讲师,从事区域地质调查和岩矿鉴定工作,E-mail:539766775@qq.com E-mail:539766775@qq.com
作者简介:贺根文(1988-),男,工程师,从事区域地质调查和矿产勘查工作,E-mail:429056423@qq.com
基金资助:
中国地质调查局项目（DD20190159-22）；国家重点研发计划项目（2016YFC0600208）；江西省教育厅科技项目（GJJ191351）

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. 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)

摘要/Abstract

摘要： 狮吼山矿区是江西省内规模最大的矽卡岩型硫铁多金属矿床，伴生W、Cu、Au多种成矿元素，成矿作用与矿区出露的茶山迳复式花岗岩体有关。岩体主要包括茶山迳似斑状黑云母二长花岗岩和莲湖细粒二长花岗岩两期，为研究成矿岩体的侵位时代、岩石成因及与成矿的关系，本次工作进行了U-Pb锆石定年、岩相学和岩石地球化学等测试分析。结果表明：岩体具有高硅、高钾、富铝的特征，属高钾钙碱性系列花岗岩；轻重稀土元素分馏明显，均为右倾型，弱Eu负异常，以富集Cs、Rb、Th、U、Pb，亏损Ba、Nb、Sr、和Ti等元素为主要特征，属于低Ba-Sr壳源花岗岩类；锆石具较好晶形，具典型岩浆锆石特征，利用LA-ICP-MS进行U-Pb测年，获得谐和年龄为（162.4±0.6）Ma（MSWD=1.8），加权平均年龄为（162.4±1.4）Ma（MSWD=1.4），谐和年龄与加权平均年龄在误差范围内高度一致，表明茶山迳复式岩体侵位于燕山早期中侏罗世；综合考虑岩体矿物组合、主微量元素及高分异特征，认为其成因分类应属于S型花岗岩；对比中国花岗岩成矿元素平均含量，茶山迳两期花岗岩均具有较高的W、Mo、Bi、Pb等成矿元素含量，可同时为成矿作用提供热源、流体及物质。

关键词: 岩石地球化学, 锆石U-Pb年龄, 狮吼山硫铁矿, 燕山早期花岗岩

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

中图分类号:

P597.3

贺根文, 路思明, 彭琳琳, 于长琦, 李伟, 刘翠辉. 赣南狮吼山硫铁多金属矿区花岗岩地球化学、年代学特征及其成因[J]. 吉林大学学报(地球科学版), 2020, 50(5): 1491-1504.

He Genwen, Lu Siming, Peng Linlin, Yu Changqi, Li Wei, Liu Cuihui. Geochemistry, Geochronology and Genesis of Granites in Shihuoshan Pyrite Polymetallic Ore Area, South Jiangxi Province[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(5): 1491-1504.

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赣南狮吼山硫铁多金属矿区花岗岩地球化学、年代学特征及其成因

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

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