昌乐地区新生代碱性玄武岩中刚玉、尖晶石巨晶岩相学、矿物化学特征
[Abstract]:Changle Shandong contains the largest gem-grade corundum-sapphire deposit in China. The boundary between macrocrystalline and basalt of Changle corundum is sharp, the edge is round, and the reaction ring edge of aluminum-rich spinel and titanomagnetite is developed along the edge of megacrystalline dissolution, which shows that it is the lithofacies characteristic of deep source xenocrystalline. The lithology, electron probe and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) analysis of giant crystals and their reaction edge minerals can effectively reveal the genesis and evolution of corundum. The mineralogical chemistry and key element characteristics of Changle corundum group 2 (CL-1 and CL-2) and the ratios of key elements such as Ga / MgCr / Ga / Fe / Ti Fe / mg show magmatic origin, while the samples of CL-2 group obviously superimpose the characteristics of late melt metasomatism. The reaction edge spinel has the compositional characteristics of the transition from corundum megacrystalline to spinel megacrystalline, and the key element characteristics indicate that they are strongly related to each other. Spinel giant crystal is the product of corundum undergoing complex metasomatism. Changle corundum shows the chemical composition characteristics of crystallization in alkaline melt, which is probably due to aluminum-rich alkaline melt formed by low melting of metasomatic enriched mantle rock.
【作者单位】： 山东科技大学地质科学与工程学院山东省沉积成矿作用与沉积矿产重点实验室;
【基金】：中国地质调查局资源部“中国大型—超大型矿床成矿地球动力学背景、过程和定量评价综合研究”专题“鲁西岩石圈结构与深部过程探讨”(编号:1212011220928) 山东省自然基金(ZR2016DM04) 山东科技大学科研启动基金(编号:2014RCJJ009)的成果~~
【分类号】：P619.28
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