鲁西郗山稀土矿石英正长岩元素地球化学特征及其指示意义  

The geochemical feature and its implication of the quartz syenite from the Xishan REE deposit in western Shandong

作　　者：兰君 付瑞鑫 张鹏 邢楠 李得建 王健 徐洪岩 LAN Jun;FU Ruixin;ZHANG Peng;XING Nan;LI Dejian;WANG Jian;XU Hongyan(Shandong Fifth Institute of Geology and Mineral Exploration,Taian 271000,China;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shandong Weishanhu REE Company Limited,Jining 277600,China)

机构地区：[1]山东省地质矿产勘查开发局第五地质大队/山东省院士工作站泰安分站,山东泰安271000 [2]中国科学院广州地球化学研究所,广东广州510640 [3]中国科学院大学,北京100049 [4]山东微山湖稀土有限公司,山东济宁277600

出　　处：《中山大学学报（自然科学版）（中英文）》2023年第3期47-56,共10页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：山东省地勘基金(鲁勘字[2018]30号,鲁勘字[2020]32号);山东地矿局基金(KC202104,KY202207);国家自然科学基金(41930424)。

摘　　要：郗山矿床是山东最重要的稀土矿床,也是除内蒙古白云鄂博和四川牦牛坪以外的第三大稀土矿床。本文对控制该矿床稀土矿化的石英正长岩的元素地球化学特征进行了详细研究,限定了该岩石的源区特征和形成的构造背景;并通过与四川牦牛坪稀土矿床石英正长岩的对比,探讨了该矿床的成矿潜力。研究结果显示,郗山稀土矿床石英正长岩是典型的橄榄粗安岩系岩石,它与牦牛坪石英正长岩具有相似的地幔源区特征,但其地幔源区流体作用的强度/规模不如后者,这可能是造成郗山稀土矿化规模较小的原因之一。元素地球化学特征还显示,与超大型牦牛坪稀土矿床的石英正长岩一样,郗山石英正长岩的地幔源区受到碳酸盐化的影响,同样具有形成超大型碳酸岩型稀土矿矿床的潜力。The Xishan REE deposit is located in the western Shandong Province,which is the third largest REE deposit in China.The deposit is genetically associated with quartz syenite.In this study,we presented detailed geochemical studies on the quartz syenite to constrain its source,geodynamic setting,and metallogenetic potentials.The quartz syenite belongs to the shoshonitic series rocks and might be generated by the partial melting of a carbonate-metasomatized mantle source during the destruction of the North China craton.Compared with the quartz syenite from the Miaoniuping REE deposit in Sichuan Province,the Xishan quartz syenite is less hydrous,which might be one of the reasons that the Xishan REE deposit has a smaller mineralization scale.Considering that both the mantle sources of the Xishan and Maoniuping REE deposits were carbonate-metasomatized,combined with the carbonatite-related REE mineralization being significant in the Maoniuping REE deposit,it is worth exploring carbonatite-related mineralization in the Xishan REE deposit further.

关 键 词：郗山稀土矿床 石英正长岩 橄榄粗安岩系岩石 地幔源区 华北克拉通破坏 

分 类 号：P597.3[天文地球—地球化学]