滇西北金沙江带硅质岩沉积环境的确定及大地构造意义  

DETERMINATION OF SEDIMENTARY ENVIRONMENTS AND TECTONIC SIGNIFICANCE OF SILICOLITES IN JINSHA RIVER BELT, NW YUNNAN

作　　者：孙晓猛[1] 聂泽同[1] 梁定益[1] 

机构地区：[1]中国地质大学

出　　处：《地质论评》1995年第2期174-178,T001,共6页Geological Review

基　　金：地矿部科技攻关项目 (8501003)

摘　　要：硅质岩是金沙江造山带中广泛分布的一种岩石类型,其沉积环境的确定对金沙江造山带的深海沉积,大陆边缘地质以及构造格局等方面的研究具有重要意义。本文从岩性特征、放射虫生态组合特征、稀土元素地球化学特征以及沉积组合特征等方面对滇西北金沙江带硅质岩沉积环境进行了综合研究,据此认为金沙江缝合带不能构成古特提斯域的主缝合带。Siliceous rocks are a rock type so widely distributed in the Jinsha River orogenic belt that the determination of its sedimentary environments is of important significance to the study of deep-sea deposition, continental-margin geology and tectonic frame work. Study on the lithology, pa-leoecology of radiolarian assemblages, REE geochemistry and sedimentary association of siliceous rocks in this orogenic belt has proved that the Jinsha River suture zone could not have formed the main suture zone in the Paleo-Tethys domain.

关 键 词：金沙江造山带 硅质岩 沉积环境 大地构造意义 

分 类 号：P588.244[天文地球—岩石学]