紫金山地区的斑岩-浅成热液成矿系统

紫金山地区绢云母-冰长石型浅成热液矿床、酸性硫酸盐型浅成热液矿床和斑岩矿床是以花岗闪长斑岩侵入体为中心的斑岩-浅成热液成矿系统的产物。其中,斑岩矿床与发育于花岗闪长斑岩顶部的高盐度岩浆流体有关;酸性硫酸盐型浅成热液矿床是近岩浆源的、从改造斑岩矿床后形成的含岩浆挥发份的热水中淀积形成的;而绢云母-冰长石型浅成热液矿床则是被侵入体侧向加热、侧向流动的中性—弱酸性热水淀积产物(相当于远成热液矿床)。

The Porphyry-Epithermal Metal logenic System in the Zijinshan Region, Fujian Province

The sericite-adularia type epithermal Ag-Au deposit, acid-sulfate type Cu-Au epithermal deposit and porphyry type Cu(Mo) deposit constitute an intrusion-centered hydrothermal system in the Zijinshan region. The porphyry Cu(Mo) deposit was related to the magmatic high-salinity and high-temperature fluid developed at the top of granodiorite porphyry. The acid-sulfate type Cu-Au epithermal deposit was formed by precipitation of an acid, low-salinity and low-temperature hydrothermal fluid, which was near the magmatic source, formed after reformed porphyry copper and carrying magmatic volatiles. The sericite-adularia type epithermal Ag-Au deposit was a product of a neutral or slightly acid, low-salinity and low-temperature hydrothermal fluid, which was laterally heated up by a granodiorite porphyry intrusion and laterally flowing.