Exploration model and deep prospecting prediction of Jiepailing tin-fluorite deposit in Hunan Province,China
Located in the heart of the Nanling metallogenic belt,the Jiepailing Sn-polymetallic deposit is a newly dis-covered large-scale deposit in recent years,primarily comprising tin and fluorite,and associated with important resources such as Li,Be,Nb,Ta and Zn.The deposit has an array of mineralized elements and large scale,strong mineralization zonation,and a relatively recent metallogenic era,estimated at around 90 million years ago,which makes it unique in the W-polymetallic ore concentration area in southern Hunan.Through meticulous geological investigations of the deposit,a thorough mineralogical study ensued,accompanied by a comparative analysis of in-situ trace elements found in fluorite and cassiterite across various mineralized sections of Jiepaling deposit.The findings elucidate a discernible shift in fluorite characteristics from a positive Ce anomaly to a negative Ce anomaly,and from a negative Eu anomaly to a positive Eu anomaly as depth decreases.This delineates a gradual escalation in the oxygen fugacity during the ascension of the ore-forming fluid.The REE partitioning features ob-served in fluorite from both the shallow ore body and the deep granite porphyry maintain a congruence,suggest-ing their shared genesis from profound,F-rich granitic magma.In contrast to the greisen type and quartz vein type tin deposit in Nanling range,the Nb-Ta content in the Jiepailing cassiterite is relatively low,but higher than that of skarn-type tin deposit,which rich in Fe and poor in W,and has a lower Zr/Hf value,averaging at 2.76.The comparative analysis suggests that the Jiepaling tin orebody still resides within the intermediate and distant reach-es of the magmatic-hydrothermal system.This suggests a significant prospecting potential extending from the depths down to concealed rock formations.Leveraging prior studies and the mineralogical study in this paper,a comprehensive metallogenic model for the Jiepaling tin-fluorite deposit has been meticulously crafted,accompa-nied by the proposal of corresponding exploration indicators.The delineation encompasses prospective prediction targets in three directions:the skarn-greisen-quartz vein-type tin(tungsten)niobium-tantalum ore in the deep near-granite of the Jiepailing deposit,deep tin polymetallic ore in the northern section of the NNE-trending main fault,tin-lithium-niobium-tantalum ore in porphyry body and deep contact zone.
tin polymetallic depositmineral trace elementexploration modelprospecting predictionJie-pailing
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