晚古生代—中三叠世右江盆地的格局和转换  

The Basin Translation from Late Paleozoic to Triassic of the Youjiang Basin and Its Tectonic Signification

作　　者：杜远生[1] 黄虎[1] 杨江海[1] 黄宏伟 陶平 黄志强 胡丽沙[1] 谢春霞[1] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,武汉430074 [2]广西地质勘查总院,南宁530023 [3]贵州省地质调查院,贵阳550004

出　　处：《地质论评》2013年第1期1-11,共11页Geological Review

基　　金：国家自然科学基金资助项目(编号40972078和40921062);教育部"111"项目(编号B08030);贵州省地质矿产局2009年度重大科研项目"水城-紫云-南丹晚古生代裂陷作用及其与主要矿产的关系"的成果

摘　　要：晚古生代—中三叠世右江盆地是在夷平的南华加里东造山带基础上再生裂陷的大陆边缘盆地,该盆地的形成与金沙江—哀牢山古特提斯洋盆关系密切,是一个具有台地与台间海槽相间结构的大陆边缘裂谷盆地。右江盆地自早泥盆世埃姆斯晚期开始裂陷,到石炭纪盆地与越北地块之间出现一个与古特提斯洋相关的局限小洋盆或深海盆。至二叠纪,该洋盆开始向西南俯冲于越北地块之下,形成活动大陆边缘。早三叠世晚期以后,随着该洋盆的闭合和碰撞造山,在凭祥、那坡等地出现同碰撞型的火山活动,右江盆地也于中三叠世转变为以复理石为特征的前陆盆地。因此右江盆地经历了裂谷盆地(早泥盆世晚期—晚泥盆世)、被动大陆边缘(早石炭世—早三叠世)、前陆盆地(中三叠世)的构造演化阶段。The Youjiang Basin was a continental margin basin during the Late Paleozoic--Triassic between Yangtze plate and Jinshajiang（ Jinsha River）--Ailaoshan（ Ailao Mountain） ocean which rifted on the base of South China Caledonian orogen. The basin has begun to rift at the time of the late Emsian and the branch ocean associated with the Paleo-Tethys was formed during the Carboniferous. In the Permian, the ocean basin began its southwest subduction beneath the Vietnam block and evolved into active continental margin. After the latest Early Triassic, following its closure and collision, the syn-collisional rocks extend in wide areas of Napo and Pingxiang. The Youjiang Basin formed a foreland basin with flysch during the Middle Triassic. experienced rift basin（late Early Devonian to Late Devonian）, passive continental margin Early Triassic ） and foreland basin（ Middle Triassic）tectonic stages.

关 键 词：右江盆地 晚古生代 三叠纪 沉积盆地 大地构造 

分 类 号：P534.51[天文地球—古生物学与地层学]