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华南古生代海平面变化与大型-超大型热水沉积矿床的形成 被引量:11

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摘要 在华南震旦系至三叠系地层中,有与热水沉积作用有关的层状、似层状和脉状金属矿床,主要集中于4个时期:(ⅰ)震旦纪大塘坡期,(ⅱ)早寒武世早期,(ⅲ)中泥盆世晚期和晚泥盆世早期,(ⅳ)早二叠世晚期。4个成矿时期均发生在一级海平面变化旋回的上升过程中的三级海平面变化旋回的最大海泛期前后,一级海平面下降过程的三级旋回的最大海泛期成矿作用微弱。最大海泛期深的海水层和非补偿性饥饿状态的悬浮、低速沉积和低能及缺氧环境为大型和超大型热水沉积矿床的形成和保存提供了有利的沉积环境;最大海泛期也是区域张裂构造活动、深部岩浆和热水作用的强烈活动期,为大型和超大型热水沉积矿床的形成提供了动力和成矿物质来源及有利的热水流体进入海底的通道,并通过热水沉积的快速堆积形成大型和超大型热水沉积矿床。
出处 《中国科学(D辑)》 CSCD 北大核心 2002年第z1期120-126,共7页 Science in China(Series D)
基金 国家攀登计划预选项目(编号:95-预-25-03-01) 国家重点基础研究发展规划项目(编号:G19990432131)
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