首页 | 学报简介 | 编委会 | 投稿指南 | 订阅指南 | 文件下载 | 期刊浏览 | 关键词检索 | 高级检索 | 联系我们   
郑伟,毛景文,欧阳志侠,赵财胜,于晓飞,赵海杰,刘东宏,吴晓东. 2018. 阳春盆地陂头面铜多金属矿床成岩成矿年代学、锆石微量元素及地质意义. 岩石学报, 34(9): 2671-2686
阳春盆地陂头面铜多金属矿床成岩成矿年代学、锆石微量元素及地质意义
作者单位
郑伟 中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037 
毛景文 中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037 
欧阳志侠 广东省有色金属地质局, 广州 510080 
赵财胜 自然资源部科技与国际合作司, 北京 100812 
于晓飞 中国地质调查局发展研究中心, 北京 100037
自然资源部矿产勘查技术指导中心, 北京 100034 
赵海杰 中国地质科学院矿产资源研究所, 自然资源部成矿作用与资源评价重点实验室, 北京 100037 
刘东宏 广东省有色金属地质局, 广州 510080 
吴晓东 广东省有色金属地质局, 广州 510080 
基金项目:本文受国家自然科学基金项目(41702083)、中国博士后科学基金项目(2018T110125、2017M610105)、中央级公益性科研院所基本业务费项目(JYYWF20180601、K1617)和中国地质调查局地质调查项目(12120114015801、1212011120826)联合资助.
摘要:
      广东陂头面铜多金属矿位于云开地区的阳春盆地内,是一个与中细粒花岗闪长岩有关的矽卡岩型矿床。矿体形态不规则,主要呈层状、似层状和透镜状,受NE和NNE向构造断裂控制。本文在详细了解矿床地质特征的基础上,通过LA-ICP-MS锆石U-Pb测年以及辉钼矿Re-Os同位素定年技术首次对陂头面矿床进行了成岩成矿年代学研究。成矿岩体花岗闪长岩的锆石U-Pb等时线年龄为163.5±0.55Ma,4件辉钼矿样品的模式年龄为162.9~163.9Ma,加权平均值为163.3±1.1Ma,结果表明陂头面铜多金属矿床成岩成矿作用基本同时发生于中侏罗世晚期,这也是阳春盆地首次报道的形成于该时期的多金属矿床。该矿床辉钼矿样品的Re含量变化于30.5×10-6~41.7×10-6,表明其成矿物质具有壳幔混源的特征。本文对成矿岩体开展了锆石微量元素的详细研究,结果获得锆石CeⅣ/Ⅲ比值范围为198~987,表明其具有高的氧逸度和很好的成矿潜力;锆石Ti饱和温度为597~782℃,暗示可能形成于与俯冲作用有关的构造环境。陂头面铜多金属矿床成岩成矿年龄的确定为下一步在阳春盆地及区域上开展150~170Ma左右的斑岩-矽卡岩多金属矿床找矿勘探提供了重要的线索,也为进一步深入研究钦杭成矿带成岩成矿作用动力学背景提供了新的资料。
英文摘要:
      The Potoumian Cu polymetallic deposit, located in Yangchun basin of Yunkai area, is a skarn deposit related to medium-to fine-grained granodiorite. The ore bodies mainly occurred as lamellar, stratiods and lenses in shape, controlled by NE and NNE-striking faults. In this study, we present detailed geologic characteristics of the deposit and carried out chronological studies of LA-ICP-MS zircon U-Pb ages for the ore-bearing granitoids and molybdenite Re-Os ages for the Potoumian deposit. Zircon U-Pb analyses yields an age of 163.5±0.55Ma for the medium-to fine-grained granodiorite. Precise Re-Os dating of molybdenite shows that the Re-Os model ages of four samples range from 162.9Ma to 163.9Ma, with a weighted mean age of 163.3±1.1Ma. These dating results suggest that the timing for the granodiorite and Cu polymetallic mineralization are simultaneously formed in the late stages of the Middle Jurassic, which is firstly reported in the Yangchun basin. The rhenium content of molybdenite samples are in the range of 30.5×10-6~41.7×10-6, implying that Cu and Mo were derived from the crust-mantle mixed source. The CeⅣ/Ⅲ values of zircons in the granodiorite from the Potoumian Cu polymetallic deposit are from 198 to 987, which suggest that its magma has a high oxygen fugacity and good metallogenic potential. The forming temperature of the granodiorite calculated by zircon Ti thermometer are from 597℃ to 782℃, indicating that its magma is probably closely related to a subducted environment. These results, together with geological records in South China, suggest that the formation of the Potoumian deposit is corresponding to the period of the large-scale mineralization in the Middle-Late Jurassic of South China. This highlights potential for discovery of additional deposits and extends the favorable interval for exploration for porphyry-skarn Cu polymetallic deposits around 170~150Ma in the Yangchun basin, and also provides new information for further discussing on the geodynamic settings of the Qin-Hang metallogenic belt.
关键词:陂头面铜多金属矿  LA-ICP-MS锆石U-Pb定年  辉钼矿Re-Os定年  锆石微量元素  阳春盆地  钦杭成矿带
投稿时间:2017-08-30  修订日期:2018-06-02
HTML   查看全文   查看/发表评论    下载PDF阅读器

黔ICP备07002071号-2
主办单位:中国矿物岩石地球化学学会
印刷版(Print): ISSN 1000-0569 网络版(Online): ISSN 2095-8927
单位地址:北京9825信箱/北京朝阳区北土城西路19号
本系统由北京勤云科技发展有限公司设计

手机扫一扫