| Citation: | Zhu Weipeng, Song Gongshe, Xu Feng, Yang Wenbo, Wu Peng. Mineralization characteristics and geological significance of Rb-rich granitic pegmatite veins in Shangnan-Danfeng area, eastern Qinling belt[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 54-67. doi: 10.19509/j.cnki.dzkq.2021.0092
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Granitic pegmatite is an important source of rare metal minerals, but its mineralization characteristics need to be further studied. This study conducted a combined field geological, indoor microscopic and major-trace elemental investigation on the petrological and geochemical characteristics of the Ziyugou Rb-rich granitic pegmatite veins in the Shangnan-Danfeng area of the eastern Qinling belt. The Ziyugou granitic pegmatites intruded the Danfeng Group. After comprehensive evaluation, 14 Rb-rich granitic pegmatite veins have been identified. On the basis of garnet contents and alteration types, the granitic pegmatites can be divided into five types: microcline granitic pegmatite, garnet-rich microcline granitic pegmatite, greisenized microcline granitic pegmatite, greisenized garnet-rich microcline granitic pegmatite and silicified microcline granitic pegmatite. The Ziyugou granitic pegmatite veins are generally peraluminous, rich in Rb, HFSE and HREE but depleted in Ba, Sr and Ti. Granitic pegmatite veins with little or without alteration usually contain highest Rb contents. Therefore, primary microcline, garnet, secondary muscovite and quartz can be served as key minerals to effectively indicate the Rb fertility of granitic pegmatite veins. The Ziyugou granitic pegmatite veins obviously postdate the Kuanping granite, and both of them exhibit significantly different geochemical characteristics. These features strongly indicate that the Ziyugou granitic pegmatite veins cannot be derived from the magmas forming the Kuanping granite, and their parent rocks were speculated to be located in depth.
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