摘要
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．
Cherts are a rock type so widely distributed in the Mian-Lue orogenic belt that the determination of its sedimentary environments is of great significance to the study of depositional environment, tectonic framework and tectonic activities. Study on the lithology, major elements and REE geochemistry proves that cherts are formed in the continental-margin environments in the Mian-Lue orogenic belt, similar in composition and characterised by the higher mass fractions of SiO 2 and lower mass fractions of Fe 2O 3,MgO,Al 2O 3, REE and weakly negative Ce anomalies.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1997年第6期599-602,共4页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
