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硅质岩是南秦岭勉略构造带中分布较广泛的一种岩石类型，其形成环境的确定对勉略造山带的沉积环境、盆地格局和构造演化的分析具有重要意义．根据对沉积组合、主要元素、稀土元素地球化学组成等方面的综合分析，认为南秦岭勉略带硅质岩形成于大陆边缘环境，其地球化学组成以富含ＳｉＯ２，贫Ｆｅ２Ｏ３，ＭｇＯ，Ａｌ２Ｏ３，以及较低的ΣＲＥＥ质量分数和具微弱的Ｃｅ负异常为特征．
Silicalite is a type of rock widely distributed in the Minyou tectonic belt of the South Qinling Mountains. The determination of its formation environment is of great significance to the sedimentary environment, basin pattern and tectonic evolution of the Mianleo orogenic belt. Based on the comprehensive analysis of sedimentary assemblages, major elements and REE geochemical compositions, it is considered that the siliceous rocks formed in the Mulinglou zone of the southern Qinling are formed in the continental margin environment, and their geochemical compositions are characterized by rich SiO2, poor Fe2O3, MgO, Al2O3, As well as the lower ΣREE mass fraction and weak negative Ce anomalies.