河南省罗山县白石坡银-铅-锌多金属矿床成因研究

Research on genesis of the Baishipo Ag-Pb-Zn polymetallic deposit,Luoshan County,Henan Province

白石坡银-铅-锌多金属矿床产于以中元古界龟山岩组为基底的NE向白石坡正断裂带内,与中生代火山活动有密切关系。文章较系统地从矿区地质、矿床地质、微量元素、同位素及流体包裹体特征等方面,深入分析了成矿物质来源、介质来源和控矿因素及成矿机理。认为该矿床属火山活动后期的中—低温热液矿床,划分为早期与韧性剪切带有关的金、中期潜火山热液活动银多金属及后期浅成火山热液活动主银成矿的三个成矿期,并建立了矿床成矿模式。

The Baishipo Ag-Pb-Zn polymetallic deposit occurred in NE trending Baishipo normal faulting zone based on Guishan Rock Formation of Mesoproterozoic, and has a close relationship with Mesozoic volcanic movements. Systematical and thorough analysis on ore-forming matters＇ sources, medium sources and orecontrolling factors with metallogenic mechanism has been finished by considering factors including geology of ore area, geology of deposits, trace elements, isotopes and fluid inclusions＇ characteristics. It has believed that this deposit belongs to medium-low temperature hydrothermal deposit formed during late volcanic movements. This deposit has been classified into three metallogenic stages in this paper, the earlier stage with Au mineralized in sheared zone, the medium stage with Ag polymetallic deposit formed during volcanic hydrothermal movements and the later stage with major Ag deposited during hypabyssal volcanic hydrothermal movements. It has also established a metallogenic mode for this deposit.