Lithospheric Stretching Modeling of the Continental Shelf in the
详细信息
- 责任者：Zhao Zhongxian (Key Laboratory of Marginal Sea Geology ; South China Sea Institute of Oceanology ; Chinese Academy of Science ; Guangzhou 510301 ; China) ; Zhou Di
- 刊名：Acta Geologica Sinica
- 出版年：2010
- 卷期：84(8)
- 关键词：伸展构造 ; extension tectonics ; 沉降 ; subsidence ; 珠江口盆地 ; Zhujiang River Mouth Basin
- 页码：p.1135-1145
- 图表：8 illus., 5 tables, 25 refs.
- 分类号：0300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Based on the flexural-cantilever model of stretching basin, lithospheric stretching coefficients of the northern section of the No.1530 line in the slope shelf of the PRMB and rule of post-break subsidence were calculated in combination with the forward and reverse modeling. It is recognized by the forward modeling that the basin rifted from north to south gradually along the north of No.1530 seismic line. The average shelf stretching coefficient is 1.2, with the coefficients ranging from 1.08 to 1.24 among the deeper sags. For the anomalies in the continental shelf and terrestrial slope, the authors’ study indicated that they might be related to continental margin of South China Sea and resulted from the same mechanism. The research also shows that the practical subsidence rate among the deeper sags is obviously different from the changing rule inferred by theory, and there are two episodes of post-breakup subsidences from fast to slow exist.