摘要
晚奥陶世与早志留世之间的都匀运动 ,使滇中古隆起与黔中古隆起成为一个整体隆起带(习惯上称黔中古陆 ) ,把滇东南 黔南地区与滇东北 黔北 川南地区分隔为南、北两个不同的构造沉积域。南侧的曲靖一带出露下、中寒武统 ,其上分别与中、上志留统和下泥盆统呈假整合 ,其间缺失奥陶纪和早志留世的沉积物。北侧的禄劝—武定一带 ,下古生界的沉积序列与之相反 ,有完整的奥陶纪沉积组合 ,上与泥盆系假整合 ,其间无志留纪的沉积。这表明黔中古隆起两侧的沉积域各为独立的系统。中、晚志留世 ,黔中古隆起南侧应归属于上扬子与滇黔桂地块前陆挠曲盆地的一部分 ,由曲靖向北东经赫章的哑都到贵阳南转向湘西 ,向南则与云南的绿春海相连 ,黔中古隆起北侧的沉积域则为上扬子前陆 (川南 黔北 )盆地的边缘相。
During Duyun movement occurred between the Late Ordovician and Early Silurian,the uplift belt called Qian Zhong Oldland was formed. This uplift belt separated southeast Yunnan-South Guizhou region and Northeast Yunnan-North Guizhou-South Sichuan region,those are two different depositional-tectonic domains,the one in the south, and another in the north. In the south domain,the Lower and Middle Cambrian, Middle and Upper Silurian, and Lower Devonian developed. There is an unconformity between the Cambrian and Silurian, and the Ordovician.In the Luquan-Wuding region of the north domain, the Ordovician is complete, and is unconformably overlain by the Devonian. The two different depositional sequences in north and south domains indicate that these two domains developed independently. In the Middle and Late Silurian, the south of the Qian Zhong uplift should belong to the Upper Yangtze block and the foreland flexural basin of Yunnan-Guizhou-Guangxi block. This area extended towards northeast to Qujing,and through Yadu of Hezhang-Guiyang,then turned to west Hunan, and southward linked with Luchun Sea in Yunnan. The north of the Qian Zhong uplift should belong to the margin area of the foreland basin(south Sichuan-north Guizhou)in the Upper Yangtze black.
出处
《古地理学报》
CAS
CSCD
2003年第2期180-186,共7页
Journal of Palaeogeography：Chinese Edition
基金
中国石油化股份有限公司"十五"重点攻关项目成果
