投稿时间：2012-10-02
修订日期：2013-11-05
网络发布日期：2013-12-29
中文摘要:铜陵矿集区内广泛分布的铁铜硫金矿床被认为与中生代发生的大规模成岩作用密切相关，其中形成于140~150 Ma之间的晚侏罗世高钾钙碱性岩体是主要的成矿岩体。文章选取铜陵焦冲金硫矿区与成矿相关的闪长玢岩开展了锆石LA-ICP-MS U-Pb同位素年代学研究，测得闪长玢岩LA-ICP-MS锆石U-Pb同位素年龄为（128.0±2.2） Ma，表明铜陵地区除晚侏罗世与大规模成矿作用相关的高钾钙碱性岩浆作用外，还存在一期早白垩世与金硫多金属成矿作用相关的岩浆活动。4个中-晚石炭世岩浆锆石一致年龄（309~328 Ma）表明该区可能存在海西期的岩浆作用，但其规模、背景及与成矿的关系还需进一步研究。其他2组继承岩浆成因锆石核的一致性年龄（1870~1931 Ma、600~808 Ma）表明铜陵地区与扬子克拉通一样存在明显的古元古代及新元古代的岩浆作用。
Abstract:The Fe, Cu, S and Au deposits distributed all over the Tongling area are considered to be closely related to the large scale magmatic activities that occurred in Mesozoic, in which the late Jurrasic high K calc-alkalic intrusions formed in 140~150 Ma are the main ore-forming plutons. The authors selected the dioritic porphyrite related to the Jiaochong Au-S deposit to conduct LA-ICP-MS zircon U-Pb dating of the pluton, and yielded an age of (128.0±2.2) Ma. It is suggested that, in addition to the late Jurrasic high K calc-alkalic intrusions related to large scale mineralization, there also existed early Cretaceous magmatism in the Tongling area, which corresponded to Au-S mineralization. Four middle and late Carboniferous concordant ages of magmatic zircons (309~328 Ma) indicate that there possibly existed Hercynian magmatism, whose scale, setting and relationship with mineralization, however need further investigation. The other two groups of concordant ages for old inherited cores of magmatic origin (1870~1931 Ma and 600~808 Ma) suggest Paleo-and Neo-proterozoic magmatism in the Tongling area.
keywords:geochemistry LA-ICP-MS U-Pb ages zircon dioritic porphyrite Jiaochong Au-S deposit Tongling
文章编号：
中图分类号：P618.51
文献标志码：
基金项目:本文得到安徽铜陵焦冲金（硫）多金属矿及蛤蟆岭金矿成因及成矿预测研究项目、全国危机矿山接替资源找矿项目（20089938）、111计划（B07011）的联合资助
引用文本：
阙朝阳,吴淦国,张达,张志辉,狄永军,方红薇,袁琴.2013.铜陵地区焦冲金硫矿床闪长玢岩锆石LA-ICP-MS U-Pb年龄及其地质意义[J].矿床地质,32(6):1221~1235QUE ChaoYang,WU GanGuo,ZHANG Da,ZHANG ZhiHui,DI YongJun,FANG HongWei,YUAN Qin.2013.LA-ICP-MS zircon U-Pb dating of dioritic porphyrite in Jiaochong Au-S deposit, Tongling area, and its geological significance[J].Mineral Deposits32(6):1221~1235
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