Folded Deformation and Ore-Controlling Feature of Shilu Group, Qingbaikouan System, Western Hainan Island
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摘要: 青白口系石碌群属于一套海相沉积经变质的以细粒碎屑岩、泥岩及镁质碳酸岩夹火山岩为原岩的变质岩系组合,赋存有沉积变质型铁矿和热液型铜钴矿。岩石经历了多期次变形作用的改造,总体表现为由褶皱变形往韧脆性断裂变形演化的特征,褶皱变形包含了三个变形序列的构造形迹组合。与铁矿主成矿期密切有关的NW向石碌复向斜属于海西.印支期造山运动的产物。铜钴矿成矿物质与海西.印支期岩浆侵入活动有关,并由于受石碌复向斜的改造,导致其与沉积变质型铁矿空间分布上的协调一致。Abstract: The Shilu Group of Qingbaikou System is composing of metamorphic rock series, whose protolith is marine fine grained clastic rock, mudstone and magnesian carbonatite with interbedded volcanic rock. Parametamorphic iron ore deposits and hydrothermal copper-cobalt deposits are hosted in the Shilu group, which has undergone several times of deformation, and evolution from fold deformation including three struc- ture assemblages of deformation sequence to brittle-ductile fracture. Shilu NW-trending synclinorium, which is the production of Hercynian-Indosinian orogeny, has a close relation with principal metallogenic epoch of iron deposit. The spatial distribution of copper-cobalt deposits, whose metallogenic material may be provided by Hercynian-Indosinian magma intrusion is consistent with parametamorphic iron deposits because of both are reshaped by Shilu NW-trending synclinorium.
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Key words:
- fold deformation feature /
- metallogenetic epoch /
- metallogenic mechanism /
- Shilu group /
- Hainan island
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