昌宁—孟连带海西印支期硅岩沉积学  

The Sedimentology of Siliceous Rocks of Hercynian Indo China in Changning Menglian Belt,Western Yunnan,China

作　　者：崔春龙[1] 曾允孚[1] 段丽兰[1] 黄志勋[1] 

机构地区：[1]西南工学院,成都理工学院

出　　处：《西南工学院学报》1995年第4期44-53,共10页Journal of Southwest China Institute of Technology

基　　金：国家八.五攻关项目

摘　　要：昌宁—孟连带是近年来滇西古特提斯研究的重要地区之一。该带晚古生代至三叠纪硅岩内放射虫古生物学的研究已给古特提斯地层研究注入了新的活力。本文从硅岩的岩石学特征、古生物特征及地球化学特征入手，探讨了硅岩的形成环境、形成方式、硅质来源及沉积大地构造背景。本区硅岩是近岸大陆边缘较闭塞的浅海至半深海环境中的生物及生物化学沉积，其沉积不仅受到陆源碎屑的影响，而且也与碳酸盐台地有关。硅质主要来自陆壳岩石。除西区二叠纪至三叠纪硅岩形成于活动大陆边缘外，硅岩主要形成于被动大陆边缘背景之下。The Changning Menglian belt is one of the important areas in study of paleo Tethys in western Yunnan in recent years。The study of radiolarian Paleoecology of D Tsiliceous rocks in this belt have poured a new energy into Paleo Tethys stratigrarhicstudy.In this paper,sedimentary environment,forming way,siliceous source and sedimen-tary tectonic setting of siliceous rocks is researched based on the characteristics of Petrolo-gy,radiolarian paleo ecology,geochemistry of siliceous rocks。The siliceous rocks in thisbelt are organisms biochemistry deposition,and formed in closer shallow semi deepsea environment of the neritic continental margin。The environment are not onlv effectedby the terrigenous clastic provenance,but also carbonite platform deposition.Siliceoussource comes mainly frorm continental provenance。The siliceous rocks are maily formed inthe passive continental margin,except for P T siliceous rocks in the west area are formedin the active sontinental margin,and related to continental crust volcanism.

关 键 词：硅岩 沉积学 岩石学特征 古生物特征 形成环境 

分 类 号：P588.244[天文地球—岩石学]