Acta Metallurgica Sinica
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KONGLingwu,ZHANG Shulin,HANWenming,ZHAO Hongyan,ZHAO Jiaqi,YU Yingmei
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Abstract: Based on the tectonics of the Central African Shear Zone (CASZ), how the CASZ controlled the formation and evolution of the Doseo Basin was analyzed in this paper. The evolutional stages of the basin were divided, the basin structure was analyzed, and the formation mechanism of the basin was discussed. Results show that the CASZ developed two periods of strike-slip processes which were strong and weak, respectively. The strike-slip strength controlled the evolutional stages of the basin, i.e., transtensional, transpressional and depression stages, The transtensional stage was the main formation stage of the Doseo Basin; in contrast, the transpressional stage was the structural setting stage of the basin. The eastern and western parts of the basin developed different strength transpression in the transpressional stage. As such, the basin was formed to a division of eastern main depression and western transpression zone. The eastern main depression developed weak transpression, and it had asymmetric double-fault structure. In contrast, the western transpression zone developed strong transpression, stratigraphic deformation, inversion of the Borogop II fault, and formation of large positive flower structural area. Transtensional and transpressional activities controlled the structural styles of the Doseo Basin in two types of structural styles and five sub-types. Transtension which was formed in right step-dextral controlled the formation of strike-slip pull-apart basin.
Key words: tectonic evolution, transpression, structural style, formation mechanism, Doseo Basin
KONGLingwu,ZHANG Shulin,HANWenming,ZHAO Hongyan,ZHAO Jiaqi,YU Yingmei. Discussion on the Structural Features and Formation Mechanism of Strike-Slip Pull-Apart Basin: A Case Study in the Doseo Basin, Central Africa[J]. Acta Metallurgica Sinica.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2019/V25/I5/722