New breakthrough in Taoxikeng quartz-vein type tungsten deposit and implica-tions for the"stepped"exploration model
The Taoxikeng(TXK)tungsten deposit in southern Jiangxi Province,is currently the largest mineable quartz-vein type wolframite deposit in the region.It mainly consists of the Baoshan,Qidong,Langengzi,and Fenglinkeng ore sections.In recent years,based on detailed exploration on the deep and side of the mining area,an important prospecting breakthrough has been made in the Dongfeng ore section at the southeast side of the TXK deposit,with newly increased resources of more than 14,000 tons of high-quality WO3.In this study,we sys-tematically compare the geological characteristics of various orebodies in the TXK deposit,and focus on the min-eralogy of the wolframite in the vein zone I of the Dongfeng section.Combined with in-situ trace element geo-chemistry of wolframite,we summarize the geochemical differences between the inner zone-type and outer zone-type quartz vein wolframite.The former has lower Zr/Hf,Nb/Ta and LREE/HREE ratios,reflecting higher evolu-tion degree of ore-forming fluids and corresponding to lower metallogenic temperature.The wolframite in Dong-feng section has the characteristics of transition from outer zone-type to inner zone-type wolframite from the shal-low to the deep,indicating that it has great prospecting potential in the depth.Accordingly,in combination with the"five-floor"model of quartz vein tungsten deposits in southern Jiangxi Province,we propose a"stepped"ex-ploration model which is suitable for deep and side prospecting of quartz-vein type tungsten deposit,and establish the corresponding exploration techniques and mineral chemical footprints of wolframite,which provides a new theoretical basis for deposit-orefield scale tungsten ore exploration.
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