南秦岭竹山地区早古生代碱性岩浆活动及其相关铌稀土成矿的若干认识
发布时间：2018-08-04 09:21
【摘要】：南秦岭竹山地区发育强烈的志留纪碱性岩浆活动,主要岩性包括正长岩、火成碳酸岩、粗面岩和碱性玄武岩,侵位时间集中于450~430 Ma。该期碱性岩浆活动主要形成于幔源碱性玄武质岩浆结晶分异演化,岩浆源区以HIMU组分为主,具有HIMU和EMⅠ、EMⅡ多种富集地幔端员混合特征。碱性杂岩体普遍发育铌、稀土矿化,形成了庙垭、杀熊洞、天宝等大型或超大型矿床。区域性深大断裂及其次级断裂控制了碱性杂岩体或碱性火山杂岩的空间展布,富碱和较高的结晶分异程度是成矿有利条件。幔源与洋壳俯冲消减、陆源沉积物再循环以及地幔流体交代作用关系密切。该期碱性岩浆-成矿事件形成于板块边缘岩石圈强烈伸展和幔源岩浆底侵上涌背景。
[Abstract]:There are strong Silurian alkaline magmatic activities in the Zhushan area of the South Qinling Mountains. The main lithology includes syenite, igneous carbonate, trachyte and alkaline basalt, and the emplacement time is concentrated at 450 Ma 430 Ma. The alkaline magmatic activity in this period was mainly formed in the crystallization differentiation and evolution of mantle derived alkaline Black Tortoise magma. The magmatic source region is dominated by HIMU components, which has the characteristics of HIMU and EM 鈪，
本文编号：2163380
[Abstract]:There are strong Silurian alkaline magmatic activities in the Zhushan area of the South Qinling Mountains. The main lithology includes syenite, igneous carbonate, trachyte and alkaline basalt, and the emplacement time is concentrated at 450 Ma 430 Ma. The alkaline magmatic activity in this period was mainly formed in the crystallization differentiation and evolution of mantle derived alkaline Black Tortoise magma. The magmatic source region is dominated by HIMU components, which has the characteristics of HIMU and EM 鈪，
本文编号：2163380
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