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Genesis of the Zhaokalong Fe-Cu Polymetallic Deposit at Yushu, China: Evidence from ore Geochemistry and Fluid Inclusions

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Acta Geologica Sinica(English Edition) 2013年第2期87卷 486-500页

作者： LI Huan XI Xiaoshuang WU Chengming Koichiro WATANABE Department of Earth Resources Engineering Faculty of Engineering Kyushu University moe Key Laboratory of Non-ferrous Metal Ore Forecast School of Geosciences and Info-physics Central South University

The ore types of the Zhaokalong Fe-Cu deposit are divided into two categories： sulfide-type and oxide-type. The sulfide-type ore include siderite ore, galena-sphalerite ore and chalcopyrite ore, whereas the oxide-type ore include magnetite ore and hematite ore. The ore textures and structures indicate that the Zhaokalong deposit is of the sedimentary-exhalative mineralization type. Geochemical analyses show that the two ore types have a high As, Sb, Mn, Co and Ni content. The REE patterns reveal an enrichment of the LREE compared to the HREE. Isotopic analysis of siderite ore reveal that the j13CpDB ranges from -2.01 to 3.34 （%0） whereas the JISOsMow ranges from 6.96 to 18.95 （%0）. The fluid inclusion microthermometry results indicate that homogenization temperatures of fluid inclusions in quartz range from 131 to 181~C, with salinity values of 1.06 to 8.04 wt% NaCI eq. The mineralizing fluid therefore belongs to the low temperature - low salinity system, with a mineralizing solution of a CO2-Ca2＋（Na＋, K＋）-SO42- （F-, CI--H20 system. The geochemical results and fluid inclusion data provide additional evidence that the Zhaokalong deposit is a sedex-type deposit that experienced two stages of mineralization. The sulfide mineralization probably occurred first, during the sedimentary exhalative process, as exhibited by the abundance of marine materials associated with the sulfide ores, indicating a higher temperature and relatively deoxidized oceanic depositional environment. After the main exhalative stage, hydrothermal activity was superimposed to the sulfide mineralization. The later stage oxide mineralization occurred in a low temperature and relatively oxidized environment, in which magmatic fluid circulation was dominant.

关键词： exhalative sedimentary deposit (SEDEX) fluid inclusions ore geochemistry Zhaokalong,Sanjiang ore belt

Impact of ethanol on the flotation efficiency of imidazolium ionic liquids as collectors:Insights from dynamic surface tension and solvation analysis

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International Journal of Minerals,metallurgy and Materials 2024年第12期31卷 2645-2656页

作者： Qian Cheng Zerui Lei Guangjun Mei Jianhua Chen key laboratory of Green Utilization of Critical non-metallic Mineral Resources Ministry of EducationWuhan University of TechnologyWuhan 430070China moe key laboratory of New Processing Technology for non-ferrous Meta1s and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

To conduct extensive research on the application of ionic liquids as collectors in mineral flotation,ethanol(EtOH)was used as a solvent to dissolve hydrophobic ionic liquids(ILs)to simplify the reagent *** phenomena were observed in which EtOH exerted different effects on the flotation efficiency of two ILs with similar *** EtOH was used to dissolve 1-dodecyl-3-methylimidazolium chloride(C12[mim]Cl)and as a collector for pure quartz flotation tests at a concentration of 1×10^(−5)mol·L^(−1),quartz recovery increased from 23.77%to 77.91%compared with ILs dissolved in ***,quartz recovery of 1-dodecyl-3-methylim-idazolium hexafluorophosphate(C12[mim]PF6)decreased from 60.45%to 24.52%under the same *** conditional experi-ments under 1×10^(−5)mol·L^(−1)ILs for EtOH concentration and under 2vol%EtOH for ILs concentration confirmed this *** being affected by EtOH,the mixed ore flotation tests of quartz and hematite showed a decrease in the hematite concentrate grade and re-covery for the C12[mim]Cl collector,whereas the hematite concentrate grade and recovery for the C12[mim]PF6 collector *** the basis of these differences and observations of flotation foam,two-phase bubble observation tests were carried *** EtOH promoted the foam height of two ILs during *** accelerated static froth defoaming after aeration stopped,and the foam of C12[mim]PF6 de-foaming especially *** the discussion of flotation tests and foam observation,an attempt was made to explain the reasons and mechanisms behind the diverse phenomena using the dynamic surface tension effect and solvation effect results from *** solva-tion effect was verified through Fourier transform infrared(FT-IR),X-ray photoelectron spectroscopy(XPS),and Zeta potential ***-though EtOH affects the adsorption of ILs on the ore surface during flotation negatively,it holds an positive value of inhibiting foam mer-ging during flotation a

关键词： ionic liquid ethanol flotation foam solvation dynamic surface tension

Geochemistry of the Batang Group in the Zhaokalong Area, Yushu, Qinghai： Implications for the Late Triassic Tectonism in the Northern Sanjiang Region, China

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 704-721页

作者： LI Huan XI Xiaoshuang SUN Huashan KONG Hua WU Qianhong WU Chengming Jillian Aira S.GABO-RATIO Department of Resources Science and Engineering Faculty of Earth Resources China University of Geosciences Wuhan 430074 China moe key laboratory of non-ferrous metal ore forecast School of Geosciences and Info-physics Central South University Changsha 410083 China Guangxi Land and Resources Planning Institute Nanning 530022 China National Institute of Geological Sciences University of the Philippines Diliman Quezon City 1101 Philippines

The Batang Group in the Zhaokalong area not only hosts an important Fe-Cu polymetallic deposit but also reveal important insights for the Late Triassic tectonism in the northern Sanjiang region. In order to delineate the tectonic setting and evolutionary process of the paleo arc-basin system, geochemical studies on the Batang Group strata have been carried out. The results suggest that andesite in the Zhaokalong area mainly belongs to the tholeiite series and is characterized by obvious fractionation of LREE and HREE, enrichment in LILE and depletion in HFSE, and a distinctly elevated δ^（34）SCDT average of 10.5‰. The sandstone is classified as lithic sandstone, which is also characterized by obvious fractionation of LREE and HREE, as well as weak negative Ce and Eu anomalies. The limestone displays positive Eu anomalies, with δ^（13）CPDB ranging from-1.3‰ to 4.4‰ and δ^（18） OSMOW ranging from 14.6‰ to 22.5‰. These results indicate that the andesite has a dual signature of both arc andesite and rift volcanic rocks, whereas the sandstone may be formed in an active continental margin, and the limestone could be deposited in a weak oxidizing shallow sea. The sandstone in the Zhaokalong area represents sedimentation in a platform slope facies, corresponding to the main stage of the Jinshajing oceanic basin subduction during the middle period of Late Triassic. The continental arc volcanic activity resulted from subsequent strengthened subduction, forming the andesite in the North Qiangtang backarc basin. Afterwards, the limestone was formed after the cessation of magmatic activity. The information gleaned from the Batang Group strata helped constrain the evolution of the paleo-Jomda island arc and Jinshajiang oceanic subduction in the Late Triassic.

关键词： arc-basin system Triassic Batang Group Zhaokalong Sanjiang Orogen