Cenozoic Tectonic Evolution of the Laizhouwan Sag in Bohai Bay Basin

详细信息   

• 责任者：Huang Lei (CNOOCChina Ltd. ; Tanggu ; 300452) ; Wang Yingbing
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(6)
• 关键词：盆地演化 ; basin evolution ; 渤海湾盆地 ; Bohaiwan Basin ; 郯庐断裂带 ; Tancheng-Lujiang Fault Zone
• 页码：p.867-876
• 图表：illus., 1 table, 31 refs.
• 分类号：0300
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

The Cenozoic tectonic evolution of the Laizhouwan Sag were systematically analyzed using currently- available seismic and drilling data, distribution features, tectonic restoration, deposition and subsidence history, and etc. The sequence and tectonic analyses reveal that in the Cenozoic, there were at least two phases of tectonic stress field changes, which played vital role in the formation and evolution of the Layzhouwan Sag. One occurred during Sha3 period （about 40 Ma）and the other between Paleogene and Neogene （about 20 Ma）. The former was coupled with another tectonic event, the Tan-Lu Fault＇s slip reversal from left lateral to right lateral, and it implies that both of them may have some geodynamical relationship. Analysis of type of the basin indicates that the Laizhouwan Sag is not a typical right-lateral strike-slip pull-apart basin, but a rifted basin controlled mainly by the extensional regime affected by the strike-slip. It is likely that the basin was affected by the left-lateral strike-slip before Sha3 period, and then was reformed into rifted and depression basin under the influence of right-lateral strike-slip. Integrated study shows that evolution of the Laizhouwan Sag in Cenozoic can be divided into four stages. rifted stage （from Kongdian period to Sha3 period ）, rifting-depression stage （from Sha 2 period to Dongying period）, post-rift depression stage （from Dong 1 period to Guantao period）, and neotectonism- related post-rift depression stage （from Minghuazhen period to now）.