湖北金银山锑矿蚀变矿物红外光谱特征及找矿应用

鄂南锑矿地区是我国重要锑矿产地之一,研究区内发现过大量锑多金属矿床(点)。目前随着浅部锑矿资源被开发殆尽,以往对中深部的找矿勘查仍未有新的进展,因此急需寻找一套快速有效的勘查方法,对该地找矿模型与预测方面进行深入研究,以扩大资源量和找矿成果。本文以金银山锑多金属矿床作为研究对象,利用短波红外光谱技术(SWIR)对于金银山锑矿ZK3101、ZK2701钻孔岩心进行光谱扫描,厘定获得了金银山锑矿蚀变矿物种类、组合、波谱参数等信息,并划分出蚀变矿物分带,分析矿化与蚀变矿物分带之间的关系。金银山锑金矿主要蚀变矿物有云母类、绿泥石类、碳酸盐类等,其中绢云母化带与成矿关系密切。通过计算绢云母族矿物Al—OH光谱特征参数,发现矿化部位绢云母结晶度(IC值)与Al—OH 2200nm 特征峰吸收峰位值(Pos 2200)出现低值异常(IC＜2, Pos 2200＜2205 nm),可作为有效的示矿指标。认为应用短波红外光谱技术可以快速圈定锑金矿体,有效指导矿产勘查,降低找矿成本,提高勘查效率,实现找矿突破。

Infrared spectroscopic characteristics and prospecting applications of altered minerals in the Jinyinshan antimony deposit in Hubei Province

As one of the important antimony mining areas in China, a large number of antimony polymetallic deposits (points) have been discovered in the southern Hubei antimony mining area. With the depletion of shallow antimony ore resources, there has been no new progress in the exploration of middle and deep parts. Therefore, there is an urgent need to find a fast and effective exploration method, conduct in-depth research on the exploration model and prediction of the area, in order to expand the amount of resources and exploration results. This article takes the Jinyinshan antimony polymetallic deposit as the research object. Short wave infrared spectroscopy (SWIR) technology was used to scan the rock cores of ZK3101 and ZK2701 boreholes in Jinyinshan antimony deposit, obtaining information on the types, combinations, and spectral parameters of altered minerals in Jinyinshan antimony deposit. The altered mineral zoning was divided, and the relationship between mineralization and altered mineral zoning was analyzed. The main altered minerals in the Jinyinshan antimony gold deposit include mica, chlorite, carbonate, etc. Among them, the sericite mineralization zone is closely related to mineralization. By calculating the Al—OH spectral characteristic parameters of sericite minerals, it was found that the crystallinity (IC value) of sericite at the mineralized site and the absorption peak value (Pos 2200) of the Al—OH 2200 nm characteristic peak showed low value anomalies (IC<2, Pos 2200<2205 nm), which can be used as an effective indicator of mineralization. It is believed that the application of shortwave infrared spectroscopy technology can quickly delineate antimony gold deposits, effectively guide mineral exploration, reduce exploration costs, improve exploration efficiency, and achieve breakthroughs in mineral exploration.