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BACKGROUND: The Panxi super large-scale Taihe vanadium-titanium magnetite deposit is located in the mafic-ultramafic layered intrusions. Research on the characteristics of infrared spectroscopy of the typical minerals of this deposit is relatively lacking, restricting exploration efficiency. The Panxi area would benefit from the use of infrared spectroscopy technology, which in recent years has attracted much attention because of its green, fast, non-destructive and accurate detection of minerals, and improvement of exploration efficiency. OBJECTIVES: To analyze the characteristics of different minerals and to efficiently identify ore-bearing intrusions and mineralized regions in the Taihe vanadium titano-magnetite deposit in the Panxi area, Sichuan Province. METHODS: Minerals were identified using Handheld FTIR through thermal infrared (TIR). The contents of Fe, Ti, and V were analyzed by Vanta VMW portable XRF. The magnetic susceptibility was analyzed by KM-7 portable magnetic susceptibility tester. Based on the core catalog, the relationship between borehole lithology, mineral assemblage, element content, and magnetic susceptibility value was studied. RESULTS: TIR can be used to achieve rapid and non-destructive extraction of the characteristic absorption peaks of pyroxene, identify the distribution of magnetite-bearing pyroxenite, and quickly define ore-bearing rock masses. The contents of Fe, Ti, and V in the Taihe deposit can be linearly fitted by magnetic susceptibility values. Different kinds of rocks and ores have different contents of Fe, Ti, V and magnetic susceptibility value. CONCLUSIONS: TIR technology is useful for prospecting magnetite-bearing rocks or deposits in unknown areas. The higher contents of Fe, Ti, and V and magnetic susceptibility values can be used as indicative information for judging the mineralization of geological bodies. [ABSTRACT FROM AUTHOR]

Tengchong block, located in the southeast margin of Qinghai-Tibet Plateau, is one of the most important parts of the eastern Tethys tectonic belt. Tectonic activities and strong magmatism have widely taken place in Tengchong block since Cenozoic, and the Cenozoic basalts widely developed in Tengchong block are great objects for studying the current mantle. Major, trace elements and Sr-Nd isotopic compositions of Cenozoic basalts in Tengchong block, and the geochemical compositions of olivines in these basalts were studied to explore the source characteristics of the current mantle in Tengchong block. The results show that the Cenozoic basalts i n Tengchong block are enr i ched i n LREE, LILE，Th，U，Pb，Zr and Hf，depleted in Sr， Eu, and they have relatively high N(87Sr)/N(86 Sr) (0. 705 964-0. 706 277) and low N(143Nd)/ N(144Nd) (0. 512 416-0. 512 467) without being significantly assimilated and contaminated during the ascending progress; the magma indicates an enriched mantle， which possibly results from oceanic crust subduction; the olivines have fine crystalline forms and low Fo values，Ni contents and various FeO/MnO ratios， respectively results from the separation and fractional crystallization of olivine in the early stage and the effect of partial melt; theCaO，MgO， FeO contents and FeO/MnO ratios of these basalts all fall into the region of pyroxenite partial melts， and its FC3MS is 0. 84-1. 17， suggesting that their mantle source is mainly composed of pyroxenite，which may be related to the subduction of oceanic crust and silicate metasomatism. [ABSTRACT FROM AUTHOR]