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Scheelite elemental and isotopic signatures:Implications for the genesis of skarn-type w-mo deposits in the Chizhou Area,Anhui Province,Eastern China

Scheelite elemental and isotopic signatures:Implications for...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： GUOXUE SONG KEZHANG QIN GUANGMING LI NOREEN J.EVANS LEI CHEN Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences John de Laeter Centre for Isotope Research Applied GeologyCurtin University Institute of Mineral Resources Chinese Academy of Geological Sciences

Scheelite is well developed in hydrothermal deposits,providing a window into genetic processes and facilitating comparative studies,however,few studies have focused on characterizing scheelite in skarn-type w-mo *** primary ore mineral in the Jitoushan and Baizhangyan skam-type w-mo deposits(Anhui Province,Eastern China),scheelite was analyzed for major,trace,and rare earth element(REE) abundance and for Sr-Nd *** analysis revealed two unique geochemieal characteristics that distinguish the scheelite from skarn-type w-mo deposits to that from vein-type Au-w and porphyry-type w-mo deposits:higher mo content with a negative coixelation between moO and wO and a strong HREE ***-type scheelite mainly inherited REE signatures from ore-forming fluids,and the early precipitation of skam minerals(e.g.,garnet,diopside,and amphibole) has most likely resulted in the observed strong HREE depletion in scheelite and the decoupling of LREEs and *** the numerous substitution mechanisms suggested by previous workers,3Ca = 2REE +- □Ca(where □Ca is a Ca-site vacancy) is preferred for the substitution of RHH for Ca and in this study,particularly given the low salinity of ore *** the scheelite Eu anomalies were inherited from ore-forming fluids with variable redox conditions and pH,the complex SEu/mo correlation indicates that mo increasingly entered the scheelite under oxidizing conditions and reached a maxim at 8Eu values of 0.8 to *** contrast,under reducing conditions,mo contents in scheelite decrease gradually and mo is precipitated as molybdenite as a result of the change in dominant valence *** the Sr-Nd isotope compositions of scheelite from vein-type Au-(w) and w-(Sb-Au) deposits,the scheelite from skam-type w-mo deposits has low(Nd/Nd)(t)(most most between 0.708 and 0.715).The εNd(t) values of the scheelite varied from-16 to-12.3 in the Baizhangyan deposit and from-9.5 to-9.1 in the Jit

关键词： Skarn-type scheelite trace element substitution REE Sr-Nd isotope Eu anomaly w-mo deposits Chizhou

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