甘肃玉门市三白墩硅石矿地质特征、成因及指示意义

甘肃省玉门市三白墩硅石矿石英纯度高，杂质少，可以用作高纯石英的加工原料。通过对硅石矿地质背景、矿床特征、控矿因素和矿石质量的研究，分析了矿床成因，认为该硅石矿严格受华力西期侵入岩及接触带构造控制，属于岩浆伟晶岩型石英脉矿床。伟晶岩分带结构比较明显，其中石英核(带)SiO₂含量最高达99.71%，具备高纯石英—云母等岩浆型伟晶岩系列矿产的成矿条件，对区域上寻找同类型高纯石英矿具有一定的指示意义。

Geological Characteristics and Indicating Significance of Sanbaidun Silicon Deposit in Yumen City of Gansu Province

As an ordinary widely-distributed non-metallic mineral resource, silica ore presents many natural types, with quartzite and quartz vein prominently. But the quartz vein resources that are processed into high-purity quartz are of rare distribution. In addition to traditional building materials, machinery manufacturing, metallurgy, chemical industry and other fields, high-purity quartz has been broadly applied in such sectors as semiconductor, aviation, aerospace, solar industry, optical fiber communication, electric light material, medical equipment, ultrasound devices. In short, it is an emerging, foundational and strategic pillar. Through the study of the geological structure background, ore-controlling factors, deposit characteristics, ore quality and ore deposit genesis of Sanbaidun silicon deposit in Yumen, Gansu province, it is found that this deposit is strictly controlled by the Variscan intrusive rock and contact zone structure, and belongs to the magmatic pegmatite quartz vein deposit. Despite the small scale, the excellent quality, and the obvious split-band structure create the metallogenic conditions of magmatic pegmatite series minerals such as quartz-rare metals-nonmetallic ore. So, the study is of great immediate importance and instructive significance for resource utilization and regional prospecting.