基于Adeli的宁东煤田构造演化数值模拟

Numerical simulation of tectonic evolution based on Adeli in Ningdong Coalfield

采用有限元数值模拟软件Adeli构建宁东煤田及邻区数值模型,模拟分析印支期、燕山期、喜山期构造演化。结果表明:印支期华北、华南板块南北向拼合的构造格局中,阿拉善地块向东滑移,北部最大主压应力方向为南东向,南部最大主压应力方向为北东向;燕山期北部最大主压应力方向为南东东向,南部最大主压应力方向为北东东向;喜山期印度板块向北俯冲,太平洋板块向西俯冲消减,中国大陆东部向东蠕散的大地构造背景下,北部主要受到北北西—南南东方向拉张应力。

A numerical model of Ningdong coalfield and its adjacent area was built by using the finite element numerical simulation software Adeli to simulate and analyze the structural evolution of Indo-Chinese,Yanshan and Himalayan periods.The results showed that:in the tectonic pattern of the north and south China plates in the Indo-Chinese period,the Alashan block slides eastward,the direction of the maximum principal compressive stress was southeast in the north,and the direction of the maximum principal compressive stress was northeast in the south.The direction of the maximum principal compressive stress in the north of Yanshan period was to the SEE,and the direction of the maximum principal compressive stress in the south was to the NEE.In the Himalayan period,the Indian plate subducted northward,the Pacific plate subducted westward,and the eastern part of the Chinese mainland crawled eastward.Under the tectonic background,the northern part was mainly subjected to the NNW-SSE tensile stress.