Alteration and mineralization characteristics of Tonglingxia copper polymetallic deposit in Gannan based on infrared spectroscopy technology
The Gannan region in southern Jiangxi Province is a significant ore concentration area of polymetallic mine-ral deposits in China with high mineralization potential.As deep exploration for mineral resources progresses,tra-ditional exploration methods prove inadequate,necessitating the urgent adoption of new methods and approaches.This study focuses on the Tonglingxia copper-polymetallic deposit in the Gannan region and employs short-wave infrared spectroscopy in conjunction with thermal infrared spectroscopy.By utilizing mineralogy and mineral geochemical methods,it establishes the composition and spatial distribution characteristics of alteration minerals in the deposit area.Furthermore,it examines the relationship between spectral features and the grade of minera-lization,investigates the formation and evolution process of typical alteration minerals in the Tonglingxia deposit,and constructs a spectral exploration model.The findings unfold as follows:Cu-Mo mineralization primarily oc-curs at the top of the granite body in the northern part of the deposit,with sericite minerals serving as exploration indicators.In the middle part of the deposit,Cu-Zn mineralization is located in the contact zone of the granite in-trusive body and can be identified through low Pos2250 values(<2243 nm)of chlorite,as well as the presence of serpentine and fractures;In the southern part of the deposit,W-Sn-Cu mineralization is associated with quartz veins and demonstrates limited overall correlation with alteration minerals,indicating a predominant occurrence of mineralization infilling rock fractures.The IC values of illite spectra in drill holes ZK9-3 and ZK9-4 in the northern part indicate a greater depth of granite intrusive body,suggesting closer proximity to the heat source cen-ter.Additionally,the variation of sericite wavelength at 2200 nm on spectrum suggests that the mineralizing fluid may originate from the northern part of the deposit.Chlorite in the central part of the deposit consists mainly of magnesium-rich chlorite,and the Pos2250 value exhibits a decreasing trend from the granite intrusive body to the contact zone.The ore-forming environment in the study area is complex,resulting in a composite ore deposit sys-tem that transitions from an alteration granite type(Cu-Mo)in the North to a weak skarn type(Cu-Zn)controlled by structures and finally to a quartz vein type(W-Sn-Cu)in the South.
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