四川若尔盖北部寒武－奥陶系太阳顶群沉积环境分析  

SEDIMENTARY ENVIRONMENT ANALYSING OF ROCKS IN TAIYANGKING GROUP,CAMBRIAN-ORDOVICIAN SYSTEMS, THE NORTHERN PART OF ROUERGAI,SICHUAN

作　　者：姜琦刚 

出　　处：《长春地质学院学报》1994年第3期271-277,共7页

摘　　要：寒武－奥陶系太阳顶群是西秦岭南亚带天重要的合金－铀岩系，其主要由碳质硅质岩及碱质板岩组成，岩石中还保留了许多沉积组构，如块状构造、纹层构造、韵律构造、结核状构造等。根据岩石学、岩石组合、沉积组构，结合岩石化学、微量元素及稀土元素特征，认为太阳顶群岩石为被动大陆边缘陆缘海槽中的非补偿性沉积，形成于半深水的滞流水沉积环境。Taiyangding Group, Cambrian-Ordovician systems,is an important gol- uranium bearing formation in the northern part of Rouergai, It consists ofcarbonaceous silicalites and carbonaceous slate,In Taiyangding Group rocks,manysedimentary fabrics are preserved such as massive structure,laminated structtire,spherulitic structure ,autobreccia structure,nodule structure,colloform texture. Basedon the rock type ,rock association,sedimentary structure,the characteristics ofpetrochemical,trace elements,REE,it may be regard as the rocks in Taiyangding Groupformed at the starved epicontinentaI trough in passive continental margin,stagnant andbathval sedimentarv environment.

关 键 词：沉积环境 太阳顶群 寒武纪 奥陶纪 

分 类 号：P534.41[天文地球—古生物学与地层学]