摘要
广东阳春石菉铜矿区位于北东向吴川-四会断裂西南端,对矿床中黄铁(铜)矿化的花岗闪长岩进行锆石U-Pb年代学研究,获得了107.2±2.0 Ma的206Pb/238U加权平均年龄,与区内石菉岩体中两件非矿化花岗闪长岩的形成时代(分别为106.7±1.4 Ma和104.1±2.0 Ma)在误差内一致;石菉岩体侵入寒武系、泥盆系和石炭系,在接触带形成的矽卡岩发育程度与矿化程度具有明显的相关性,指示了石菉铜矿床的成矿作用与花岗闪长岩体的侵位密切相关。矿区内分布有燕山早期至燕山晚期的侵入岩,岩性由钾玄质系列过渡到钙碱性系列,反映了区域岩石圈伸展-拉张的构造背景。石菉铜矿床应是区域岩石圈伸展-拉张背景下岩浆作用的产物。
The Shilu copper deposit in Yangchun city, Guangdong province is located at southwest of the NNE-strike Wuchuan-Sihui fault. LA-ICP-MS U-Pb dating of zircons from a pyrite （-chalcopyrite）-mincralizcd granodiorite sample from the Shilu Copper deposit yielded a weighted mean 206pb/E38u age of 107.2±2.0 Ma, consistent with the results obtained from two non-mineralized granodiorite samples of the Shilu pluton （106.7±1.4 Ma and 104.1±2.0 Ma, respectively） within analytical errors. This indicates that the mineralization was closely related to the emplacement of the granodiorite pluton. Early to Late Yanshanian shoshonitic to calc-alkaline intrusive rocks are widespread in the Shilu area, suggestive of a lithospheric extension tectonic setting. Accordingly, the formation of the Shilu copper deposit might have resulted from the ma^matic activity induced by this lithosnheric extension.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2013年第4期754-764,共11页
Geotectonica et Metallogenia
基金
地质调查项目“中南地区重大地质事件同位素年代学研究”(编号:1212011121102)资助
