论文部分内容阅读
古生代以来,海南西部戈枕含金剪切带至少经历了三次类型不同的构造变形,并发生了三次相关的金矿化。该剪切带的构造变形,在加里东旋回发生于抱板群矿源层下构造层次,表现为韧性剪切,其晚期形成含金长英质脉;在海西-印支旋回发生于中构造层次,表现为韧-脆性变形,形成糜棱岩型和石英脉型金矿床;燕山旋回的构造变形发生于上构造层次,表现为脆性特征,并伴有岩浆热液作用,形成最具工业价值的破碎蚀变岩型金矿床。本文在此基础上提出了含金剪切带型金矿成矿系列概念,具体厘定出红甫门岭糜棱岩型、不磨石英脉型及北牛破碎蚀变岩型三种矿床式,并总结了含金剪切带构造成矿四阶段模式。
Since the Paleozoic, the Gezhu gold-bearing shear zone in western Hainan has undergone at least three types of tectonic deformations and occurred three times related to gold mineralization. The structural deformation of this shear zone occurred in the Caledonian structural layer beneath the source rock layer of the clapboard group, showing ductile shearing and late-forming gold-bearing quartz veins. The Hercynian-Indosinian cycle occurred at the mid-tectonic level, Showing ductile-brittle deformation to form mylonite and quartz pulse type gold deposits. The Yanshan cycle tectonic deformation took place in the upper structural level, manifested as brittle characteristics, accompanied by magmatic hydrothermal effect, forming the most industrial-value crushing Altered rock type gold deposit. Based on this, the paper proposes the concept of metallogenic series of gold-bearing shear zone type gold deposits, and specifically determines three kinds of deposit types of mylonite type, unglued quartz vein type and northern cattle crushed altered rock type, The conclusion is that the gold-bearing shear zone is a four-stage ore-forming model.