闽西南坳陷带中生代地质历史演化与钼矿床成矿时代

闽西南坳陷带是特提斯构造域向环太平洋大陆边缘构造域转换的典型地区,又是华南地区主要的钨、铜、钼、金、银、铁和稀土成矿带。初步总结了闽西南坳陷带中生代钼矿床的类型、空间分布特征和成矿时限,阐述了区域地质构造与演化、岩浆作用的期次及岩石系列组合,探讨了钼成矿系列问题以及区域构造—岩浆—成矿之间的关系。研究表明,闽西南坳陷带钼成矿作用主要发生在165¹45Ma、135145Ma、135¹15Ma和115115Ma和115¹05Ma三个时间段,分别对应的构造环境为挤压、伸展扩张及扩张增强和裂解阶段。这三个阶段的成矿作用分别形成于华南和华北地块后碰撞及太平洋板块向欧亚板块东南缘俯冲引起弧后多阶段岩石圈伸展构造环境。

Molybdenum deposit metallogenic epoch and Mesozoic geological history evolution in the depression basin of southwestern Fujian

The main ore bodies of Huayuling Pb-Zn-Cu Deposit are controlled by three kinds of metallotectonics, namely structural vein type, structural breccias type and interformational fracture zone type. The structural vein type metallotectonics are extensional tectonics resulted from the early activities of NE-trending F1 fault, and extensional fractures resulted from NE-trending F2 fault, which mainly controls veined Pb-Zn ore body in the southern section and veined Cu ore body in the eastern section of Huayuling respectively. The structural breccias type metallotectonic is strike-slip flower tectonics resulted from lately activities of NE-trending F1 fault, which controls the brecciaed Pb-Zn ore body in the southern section and slope. The interformational fracture zone type metallotectonics is the interlayer-gliding tectonics, controlling bedded Pb-Zn ore body on the top of Mount Huayuling. Based on the research of metallotectonics characteristics of Pb-Zn-Cu Deposit and the genesis of ore-controlling structure, the mineralization prospect of all kinds of ore bodies in Huayuling Deposit is evaluated.