内蒙东七一山碱长花岗岩及其成矿作用

碱长花岗岩在国内外普遍以含多金属元素、特别是稀有金属矿化为特征，该类矿化岩体在我国多分部在华南褶皱系，而产出在内蒙西部的东七一山碱长花岗岩是我国北方地区少见的一个大型稀有金属矿化体，由于前人工作不多，对其认识较浅。本文在前人工作基础上，对其岩石学、成矿学及成岩、成矿机制等方面做了较多细致、深入的工作，表明该岩体是一个壳源岩浆直接分异演化而成的碱长花岗岩体，岩体除铷含量较高外，其中的铌－钽也有很高的利用价值，碱长花岗岩还是钨、锡、铍资源的源泉，同时派生出的大型萤石矿和文石－方解石矿产也有很高的经济价值，从而大大提高了对东七一山碱长花岗岩成岩、成矿实践和理论认识，这对在区域上扩大与这类岩体有关的找矿工作具有重要指导意义。

Alkali Feldspar Granite and Its Metallogenesis of Dongqiyishan, Inner Mongolia Autonomous Region

In china and abroad, the alkali feldspar granite is generally characteristic of polymetallic mineralization, especially the rare metal mineralization. In china, this kind of mineralized intrusions are mostly distributed in the South China fold system. The Dongqiyishan alkali feldspar granite in the western Inner Mongolia is a large rare metal mineralized rock body in the northern area of China, where this kind of intrusion is infrequent. Because of lacking former researches, the understanding on it is somewhat superficial. Based on the few former research, this paper performed a lot of deep and detailed work on its lithology, metallogeny and the mechanism of its petrogenesis and mineralization. It shows that the intrusion is a alkali feldspar granite rock body formed by direct differential evolution of the crust-derived magma. Besides rubidium, the Nb-Ta contained in the rock also has considerable value in use. Furthermore, The alkali feldspar granite is the source of the tungsten, tin and beryllium resources. The large fluorite deposit and Aragonite-calcite deposit derived from the intrusion also has extremely high economic values. This can greatly improve the practice and theory of the petrogenesis and mineralization of the Dongqiyishan alkali feldspar granite. It also has great implication for guiding regional prospecting ore deposits related with this kind of intrusions.