印度尼西亚苏拉威西岛—北马露姑群岛区域地质构造背景及其对蛇绿岩、红土型镍矿规模的控制

Regional geological structure background and its control over the size of ophiolite and laterite type nickel deposits Sulawesi Peninsulas-North Maluku Islands in Indonesia

三大巨形板块碰撞汇聚带控制了班达海左行旋卷构造带,地幔对流、推-拉模式驱动板块运动,形成左行平移断裂,诱发本区海陆构造格局。早期引张软流圈地幔超基性岩浆沿洋中脊上拱,晚期挤压推覆到火山岛弧边缘部位。蛇绿岩沿两个"K"字形岛展布,不同的构造尺度控制了蛇绿岩的时、空、类型、规模及红土型镍矿的分布,以白垩系蛇绿岩控制的红土型镍矿规模最大。

The collision convergence zone of the three gigantic plates controls the sinistral convolute structure belt in Banda Sea,and the mantle convection and push-pull mode drive plates to move and thus form the sinistral strike slip which induces the land-sea tectonic framework of this area.The ultrabasic magma from stretch asthenospheric mantle rises up along the mid-oceanic ridges at early stage,and it is compressed and thrusted to the rim parts of volcanic arcs at late stage.The ophiolite distributes along the two K-shaped islands,and different tectonic scales control the time,space,type,scale of ophiolite and the distribution of laterite type nickel deposits.The laterite type nickel deposit controlled by Cretaceous ophiolite is the largest deposit in scale.