西昆仑塔什库尔干地区老并石膏磁铁矿地质特征及成矿作用过程探讨
Geological Features and Mineralization Process of Laobing Gypsum Magnetite Deposit in Taxkorgan Region of West Kunlun
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摘要: 老并石膏磁铁矿位于塔阿西大断裂西侧,为一种新的矿床类型.笔者依据最新大调查、详查及勘探成果,通过矿区地质、矿床地质等方面综合分析研究,认为老并石膏磁铁矿成矿过程为海底火山活动带来了大量的炽热含盐和金属溶液,形成含矿溶液;含矿溶液在Eh、pH值差异的驱动下运移,并在特定的物理化学条件下,导致铁质的卸载沉淀,形成磁铁矿;同时由于炽热的含矿溶液与海水相互作用,为硬石膏的形成提供了S的物质来源,从而出现石膏、磁铁共生的现象.对于深化西昆仑地区磁铁矿成矿带成矿认识,总结区域成矿规律具有一定的理论意义和实践意义.Abstract: Laobing gypsum magnetite deposit, a new deposit type, is located in the west side of Ta'axi major fracture. This article is based on the newest investigation results and the analysis about the mining area geology as well as ore deposit geology. Then we get the conclusion about the mineralization process of Laobing gypsum magnetite deposit: the submarine volcanic activities brought a lot of hot solution with salt and metallic solution to form the ore-bearing solution who transferred by the driving of Eh and pH value discrepancy, then under certain physicochemical conditions, iron would precipitate and form magnetite. Meanwhile, interaction between the hot ore-bearing solution and the seawater provided sulfur for anhydrite, thus the symbiosis of gypsum and magnet happened. This phenomenon would help us to deepen understanding about the West Kunlun metallogenic belt and summarize the regional metallogenic regularity.
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