摘要
若尔盖-松潘盆地中、上三叠统沉积剖面研究表明以陆相沉积为主,只在东北部青山峪有浅海相碳酸盐岩沉积。盆地北部出现河流、浅湖相沉积,中部以浅湖相沉积为主,局部出现深湖相沉积,南部主要为深湖相沉积。中、上三叠统地层的变形构造以冲褶席(duplex)构造为特点,表现出从北向南应变强度减弱。深部构造反映了盆地位于扬子板块大陆壳基底之上,叠覆在扬子板块北缘的前陆褶皱冲断带上。大地构造位置、沉积相与构造特点,共同说明若尔盖-松潘盆地是三叠纪碰撞造山作用时期扬子板块北部北缘的前陆盆地。
The studies from the stratigraphic column of the Upper- and Middle-Triassic sediments in the Ruoergai-Songpan basin indicate that the fills are mainly continental clastics and there is only a section of the shallow marine carbonate rocks outcropped in the northeastern corner of the basin. In the northern part of the basin, there are fluvial and lake facies deposits. In the central part, there are mainly shallow lake facies sediments, and partly deep lake sediments. In the southern part, there are mainly deep lake facies sediments. The structures of the Upper- and Middle-Triassic strata are duplex structures, and the deformation strength is weakened gradually from north to south. According to Gao et al. （2006）, the Ruoergai-Songpan basin is located on the basement of continental crust of the Yangtze plate, and on the foreland fold-thrust belt. Based on the tectonic setting, and sedimentary and structural characteristics, the Rouergai-Songpan basin was a foreland basin at the northern margin of the Yangtze plate in Triassic.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第5期919-924,共6页
Acta Petrologica Sinica
基金
国家自然科学基金重点项目(40334044)资助
关键词
若尔盖-松潘盆地
沉积和构造特点
前陆盆地
Ruoergai-Songpan basin, Sedimentary and structural characteristics, Foreland basin
