Tectonic Framework and Multiple Episode Tectonic Evolution in Deepwater Area of Qiongdongnan Basin , Northern Continental Margin of South China Sea
详细信息
- 责任者：Lei Chao (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Ren Jianye
- 刊名：Earth Science
- 出版年：2011
- 卷期：36(1)
- 关键词：构造格架 ; tectonic framework ; 海洋环境 ; marine environment ; 琼东南盆地 ; Qiongdongnan Basin
- 页码：p.151-162
- 图表：7 illus., 43 refs.
- 分类号：0300
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
In this paper, a tectonic framework with zonal array in NS direction and block division in WE direction was established in deepwater area of Qiongdongnan Basin (QDNB). A key tectonic revolutionary boundary, T70, was identified in QDNB by integrated analysis of tectono-stratigraphy, subsidence history and subsided depocentre migration. Analyses of genetic type and geometry of basin-boundary fault indicate that NW-SE extensional tectonic stress field strongly controlled development of small distributed NE-trending faulted basin group underlying T70 boundary, and nearly SN extensional tectonic stress field resulted in formation of fault-sag basin over this boundary. The evidence of regional and biostratigraphical correlation shows that the age of this boundary is 32 Ma, which is consistent with the time of initial spreading of South China Sea. Thus T70 boundary is a regional tectonic revolutionary boundary.
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