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Termit盆地构造变形的力学机制

, PP. 377-383

Keywords: Termit盆地,中西非裂谷系,东尼日尔,局部应力场,有限元数值模拟,力学机制

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Abstract:

Termit盆地是中西非裂谷系中典型的中-新生代裂谷盆地,形成于早白垩世大西洋张裂的构造背景下。在白垩纪至古近纪经历了“裂谷-坳陷-裂谷”的构造演化过程,且两期裂陷作用形成的断裂走向不同。依据Termit盆地的基础构造特征,运用弹性有限元数值模拟方法,从动力学角度讨论盆地构造演化模式,为盆地的构造演化研究提供动力学依据。模拟结果表明,在早白垩世,盆地受区域NE-SW向拉张作用,在盆地西部边界发育一系列NW-SE向早白垩世早期断层。在古近纪,盆地受近EW向拉张作用,在盆地西部受早期断层影响较大的Dinga断阶带和Yogou西斜坡地区,局部应力场使断层发育走向为NW-SE;受其影响较小的Araga地堑发育张扭性断层,沿早白垩世断层呈雁行排列;不受其影响的Fana低凸起和Moul凹陷发育NNW-SSE向断层。

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