壳幔相互作用对W-Mo矿床形成的制约：以江南古陆阳储岭斑岩型W-Mo矿床为例

成钨、成钼岩浆均可以来自地壳物质的重熔，但也不排除成钼岩浆来自地幔或新生下地壳。W-Mo矿床的形成常伴随壳幔相互作用，幔源岩浆除了为W-Mo矿床成矿岩浆的形成提供热源外，是否还提供了成矿物质？目前仍然缺乏有力证据。阳储岭斑岩型W-Mo矿床的矿区内基性、酸性岩浆相互作用的痕迹十分明显，并且宏观和微观证据均显示W、Mo矿化分别与酸性和偏基性岩石密切相关。因此，阳储岭矿床是研究解析壳幔相互作用对W-Mo矿床成矿作用制约的一个窗口。本项目拟对阳储岭矿床成矿相关岩体内的单矿物开展精细的矿物学原位微区研究，根据锆石Hf-O同位素厘定分别与W、Mo矿化作用密切相关的岩体岩浆源区性质；从斜长石、角闪石、榍石的环带成分变化探索其生长过程中所经历的岩浆过程，并结合角闪石、榍石环带及磷灰石的W、Mo元素含量揭示岩浆体系内W、Mo元素浓度在岩浆过程中的动态变化；论证壳幔相互作用对W-Mo矿床成矿作用的制约。

It is generally accepted that the W and Mo-bearing granitic magmas are mainly derived from partial melting of crustal materials, however, the possibility that Mo-bearing granitic magmas could be derived from the melting of mantle or juvenile lower crust cannot be excluded. The mantle-crust interaction is commonly involved in the formation of the W-Mo mineralization, during which the mantle-derived mafic magmas likely provide the heat that triggers the partial melting of crustal materials. Nevertheless, it is still lack of strong evidence to support the hypothesis that the mantle-derived mafic magmas also provide metallogenic materials for the W-Mo mineralization related granitic magma. The intense interaction of mafic and felsic magmas is recorded in the ore-related granitic rocks of the Yangchuling W-Mo deposit. Both macroscopic and microscopic evidence shows that the W and Mo mineralization closely related to felsic and dioritic magmas, respectively. Therefore, the Yangchuling deposit is a window to explore the possible contribution of mantle-crust interaction processes to the genesis of W-Mo deposits. This project plans to focus on the detail in-situ microanalysis of minerals in the mineralization-related granitic rocks of the Yangchuling deposit. Zircon Hf-O isotopes will be used to define the magma source of the W and Mo mineralization related granitic magma. The elemental compositions of the growth zoning of plagioclase, hornblende and titanite will be studied for the purpose of reconstruction of magma processes. The W, Mo concentration of apatite, and the growth zoning of hornblende and titanite will also be studied to reveal the dynamic variation of W, Mo concentration in the magma system during the magma processes. This study will shed light on the controls of mantle-crust interaction performed on the W-Mo mineralization.