摘要:
本文提出了鄂尔多斯周邻地壳应力场的一个简化力学模型。在这个模型中,欧亚板块被简化为一个无限大Hooke薄板,稳定而且完整性好的鄂尔多斯地块则被模拟为一个嵌入在该板内的刚性椭圆核。由于印度洋板块碰撞和太平洋板块的俯冲,使该板承受着一种沿太平洋板块向西俯冲方向的单向压缩。利用该问题的Mycxeлишвили解,分析和计算了鄂尔多斯地块周邻地区地壳应力场,对该地块周邻地壳应力场特征提出了一种可能的解释。认为华北地壳应力场与鄂尔多斯地块周邻应力场可能是同一种力源作用下形成的,鄂尔多斯地块周围存在小区域应力场的原因可能反映了介质明显的非均一性。
Abstract:
In this paper, a simplified mechanical model for the crustal stress field around the Eerduosi block is provided. The Eurasian plate is simplified as an infinite, thin Hooke plate. The relatively stable and integrate Eerduosi block is modeled as a rigid elliptic inclusion embeded in the plate. Due to collision with the Indian Ocean plate and underthrust of the Pacific Ocean plate, the Eurasian plate is compressed in the direction of the westward underthruet of the Pacific Ocean plate. Using Muskhelish-vili's solusion for this problem, the crustal stress field around the Eerduosi block is analysed and calculated, and a possible explanation is provided for the character of the crustal stress field around the block. The crustal stress field of North China may be formed by the same source of force as the crustal stress field around the Eerduosi block, and a small regional stress field that exists around the block possibly reflects the important inhomogeneity of the medium.
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