东南亚加里曼丹新生代金成矿作用及成矿动力学

对加里曼丹岛区域地质背景、金成矿作用与新生代岩浆弧关系研究认为,该区浅成低温热液金矿床与新生代岩浆弧内晚渐新世—中中新世钙碱性岩浆活动存在着密切的时空及成因联系。其动力学机制为,始新世—中新世期间印度—澳大利亚板块向欧亚板块俯冲引起的地幔物质向南东方向的流动导致早渐新世亚洲边缘发生裂解,裂解作用又导致南中国海板块向加里曼丹岛北缘俯冲。俯冲过程中加里曼丹岛北缘在晚渐新世—中中新世发生大规模的构造岩浆活动及浅成低温热液金成矿作用。成岩成矿作用是在总体挤压背景体制下的局部拉张环境下进行的。

Cenozoic Au Mineralization and its metallogenic dynamical mechanism in Kalimantan, Southeast Asia

Based on the study of the relationship among regional geological background,mineralization and magmatic arc in Cenozoic,it is considered that the epithermal Au deposits in this area have closely spatio-temporal and genetic relationships with calc-alkaline magmatic rocks in late Oligocene-middle Miocene.Dynamical mechanisms of magmatism and mineralization are considered that Indian-Australian Plate subducting under Eurasian Plate made mantle material flowing towards southeast during late Oligocene-middle Miocene and led to margin of Asian continent rifting,which led to the South China Sea Plate subducting under the northern margin of Kalimantan Island.During the subduction,large-scale tectono-magmatic activities and epithermal Au mineralizations happened during the late Oligocene-middle Miocene.And the authors found that magmatism and mineralization took place in the local tensional tectonic background within whole compressional one.