Mica Mineral Characteristics and Geological Significance of Gao'aobei Tungsten-molybdenum-lithium Deposit in Hunan-Jiangxi Junction
The Gao'aobei tungsten-molybdenum deposit in the central section of the Nanling polymetallic metallo-genic belt is associated with spodumene-type and granite-type lithium resources,which makes it a rich mica tung-sten-molybdenum-lithium deposit.In order to reveal the types,formation sequences and occurrence states of lithi-um of mica minerals in this deposit,a systematic petrographic observation and electron probe analysis of mica min-erals in various granites of the deposit were carried out.The results show that the formation sequence of mica min-erals in this deposit is iron foliaceous mica,black scale mica,iron leucite and leucite,which are characterized by rich in Al,K and Li,and poor in Mg,Ca and Ti,and belong to hydrothermal muscovite in early and late Yan-shannian.In the early Yanshannian,the content of Li2O in hydrothermal muscovite is positively correlated with the content of F,but the content of Na2O+K2O and AlⅥ are negatively correlated with the content of F,indica-ting that albitization,dolomitization superposition and F-rich hydrothermal fluid related to multi-stage hydrothermal processes are the key factors controlling lithium mineralization.
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