Origin of the Dabashan Foreland Salient: Insights from Sandbox Modeling
详细信息
- 责任者：Wang Ruirui (State Key laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhang Yueqiao
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(9)
- 关键词：弧形构造 ; arcuate structure ; 大巴山 ; Daba Mountains
- 页码：p.1409-1419
- 图表：4 illus., 1 table, 39 refs.
- 分类号：0300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
///Based on sandbox modeling,the formation mechanism of the Dabashan foreland salient is discussed in the article.Experimental results show that multi-factors control the formation and evolution of the Dabashan foreland salient.These factors include pre-existing arc-shaped boundary originated in extensional setting,a pair of indenters in the front and basal d collement et al.Besides,the former-formed structures in extensional setting may have a significant influence on the later stuctures in compressional setting in North Dabashan mountain.Accordingly,the evolutional history of the Dabashan foreland salient can be divided into 5 stages: ①Hannan block,Shennongjia block and Huangling block quickly uplifted during Jinningian movement which served as indenters afterward;②primary boundary conditions formed during the Early Paleozoic extension along the northern margin of the Yangze Block;③Middle-Late Triassic collisional orogeny which caused structural inversion and appearance of the original Dabashan foreland salient;④Middle-Late Jurassic intra-continental orogeny which resulted in the formation of the Dabashan foreland salient;⑤modified by strike slip faults after Cretaceous.