Inversion of a symmetric basin: insights from a comparison between analogue and numerical experiments
Inversion of a symmetric basin: insights from a comparison between analogue and numerical experiments
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对称盆地反演：模拟实验与数值实验比较的见解
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
O. Pfiffner
中科院分区：
文献类型：
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作者：
M. Panien;S. Buiter;Guido Schreurs;O. Pfiffner
摘要采用模拟实验和数值实验相结合的方法对对称沉积盆地的缩短反演进行了研究。这两种建模技术的结合利用了每种方法的优势，以深入了解盆地反演过程。实验从一个预先存在的盆地开始，其中部分填充了模拟弱沉积岩的弱层。下盘和上盘均可自由变形。模拟实验中使用的材料（砂和微珠）和数值实验的物理性质被适当地缩放以表示上地壳岩石。我们对盆地填充物、盆地宽度和盆地位置的影响进行了系统研究，并进行了敏感性分析，以了解边界条件的影响。两种方法的结果都表明，地堑充填体最适合缩短。弱层在局部缩短中发挥重要作用，限制了已有（但已减弱）断层的再激活。一般来说，前逆冲和后逆冲在强弱物质横向对比处成核，并横切地堑边界断裂。为了将缩短转移到盆地地区，需要弱的基底分离。模拟模型和数值模型的整体演变是令人鼓舞的相似。
Abstract We use both analogue and numerical experiments to study the inversion by shortening of a symmetric sedimentary basin. The combination of the two modelling techniques uses the strengths of each method to provide insight into basin-inversion processes. The experiments start with a pre-existing basin filled, in part, with weak layers simulating weak sedimentary rocks. Both footwall and hanging wall can deform freely. The physical properties of the materials used in the analogue experiments (sand and microbeads) and the numerical experiments are appropriately scaled to represent upper crustal rocks. We present a systematic study of the effects of basin infill, basin width and basin location and a sensitivity analysis to understand the effects of the boundary conditions. The results of both methods show that the graben fill accommodates most shortening. Weak layers play an important role in localising shortening with limited reactivation of pre-existing (but weakened) faults. In general, forward thrusts and back thrusts nucleate at the lateral contrast of strong and weak materials and cut across the graben-bounding faults. Weak basal detachments are required to transfer shortening to the basin region. The overall evolution of the analogue and numerical models is encouragingly similar.