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短波红外光谱分析技术是近年来兴起并逐渐走向成熟的一种热液矿床围岩蚀变研究方法。铁帽山斑岩型钼矿床的围岩蚀变作用强烈,主要蚀变类型包括钾化、硅化、伊利石化、蒙脱石化等,并具有明显的分带性特征。其中,伊利石-蒙脱石类蚀变与斑岩型钼矿化作用密切相关。经过对钻孔岩心开展系统的短波红外光谱测量,准确地鉴定了蚀变矿物类型,划分了蚀变带,并且根据短波红外光谱测量结果计算了样品的伊利石结晶度(SWIR-IC),定量地研究了伊利石化蚀变作用的强度。结果表明,在伊利石-蒙脱石化作用范围内,伊利石结晶度越高钼矿化作用越强,但在强硅化蚀变带内,伊利石含量会有所降低,而在钾化带内,伊利石结晶度与钼矿化作用无关。在斑岩型钼矿床的找矿勘查工作中,系统地开展短波红外光谱测量,一方面可以准确鉴别蚀变矿物的类型,另一方面可以根据伊利石结晶度的指标来判断含矿热液活动中心,指导勘查工程的布设。
Shortwave infrared spectroscopy is a research method of wall rock alteration of hydrothermal deposits that has been rising and maturing in recent years. The Tiaomaoshan porphyry molybdenum deposit has strong wall rock alteration. The main alteration types include potash, silicification, illite and montmorillonite, and have obvious zonation characteristics. Among them, the illite-montmorillonite alteration is closely related to porphyry-type molybdenum mineralization. After systematic short-wave infrared spectroscopy measurement of borehole core, the types of alteration minerals were accurately identified, the alteration zones were divided, and the SWIR-IC was calculated based on SWIR-IC measurements. Quantitative Studied the intensity of the alteration of Erie petrochemical. The results show that in the illite - montmorillonization range, the higher the crystallinity of illite is, the stronger the molybdenum mineralization is, but the illite content will decrease in the strongly silicified alteration zone. However, , Illite crystallinity and molybdenum mineralization has nothing to do. In the porphyry-type molybdenum deposit prospecting exploration work, the system to carry out short-wave infrared spectroscopy, on the one hand can accurately identify the types of alteration minerals, on the other hand can be based on indicators of illite crystallinity to determine ore-bearing hydrothermal activity Center, guide the laying of exploration projects.