冀东麻地岩体铷等稀有金属元素赋存特征

Occurrence characteristics of Rubidium rare metal elements in Madi granite,eastern Hebei Province

麻地岩体发生铷等稀有金属元素矿化,有形成大型稀有金属矿床的远景。为了查明麻地岩体稀有金属元素赋存特征,扩大找矿成果,依据区域地质资料和前人研究成果,开展野外地质调查与样品测试。在显微岩石学研究的基础上进行了电子探针分析,明确了麻地岩体稀有金属元素赋矿岩石的组构特征与矿物特征,分析了稀有金属元素的赋存状态,探讨了稀有金属元素富集机理。认为稀有金属元素偏向于在岩浆演化的晚期阶段富集,云母容纳稀有金属元素的能力强于钾长石,但钾长石的含量远大于云母,故岩体中钾长石的稀有元素总量高于云母。

Mineralization of rare metal elements took place in Madi granite,which has the prospect of forming large rare metal deposits.In order to find out the occurrence characteristics of rare metal elements in Madi granite and expand prospecting results,based on regional geological data and previous research results,field geological survey and sample test were carried out.Based on the study of micropetrology,electron probe microanalysis was carried out.It is clear that the fabric and mineral characteristics of the rare metal ore bearing rocks in the Madi granite.The existing state of rare metal elements is analyzed.The enrichment mechanism of rare metal elements was discussed.Rare metal elements tend to enrich in the late stage of magmatic evolution.Mica is more capable of containing rare metal elements than potassium feldspar,but the content of potassium feldspar is much higher than mica,so the total amount of rare elements in potassium feldspar is higher than mica.