马来半岛北部索谷金矿区变质岩原岩恢复

Reconstruction of Protoliths of Matamorphic Rocks and Tectonic Setting in Sokor District,Malaysia Peninsula

马来西亚索谷(Sokor)地区位于马来半岛中央金成矿带北段,区内金矿床的赋矿地层为一套二叠—三叠系浅变质火山—沉积岩系。重点对赋矿地层的岩石学微量元素及稀土元素地球化学特征进行了系统分析,结果表明:该套火山岩以高铝、低钛为特征,属于钙碱质岩系;岩石相对富集轻稀土,高场强元素Nb、Ta、Ti,大离子亲石元素Rb、Th等,具有明显的岛弧火山岩特点。变质沉积岩形成构造环境判别结果表明,该套变质火山—沉积岩系形成于活动大陆边缘的岛弧环境。

district Sokor is located in the Northern section of Central gold mineralization belt, Malaysia Peninsula. The ore deposits are occurred in a series of low-grade metamorphic volcanic-sedimentary rocks of Permian-Triassic. To study the genesis of gold deposit in Sokor, the characters of lithology,composition, trace elements and REE elements have been conducted.The results show that：the protoliths of these rocks are characterized by relatively high, aluminum, high LREE, and noticeable enrichment in both HFSE such as Nb, Ta, Ti and LILE including Rb, Th, which have the typical characteristic of island arc volcanic.Tectonic setting discrimination of metamorphic rocks indicates that they formed in island arc environment of active continental margin.