山东青岛灵山岛褶皱样式及力学特征分析

Analysis on Fold Style and Mechanical Characteristics of Lingshan Island in Qingdao City in Shandong Province

灵山岛褶皱构造发育,类型表现出多种形式,其成因类型还存在争论。通过地质填图工作,在对灵山岛褶皱构造要素进行观察、测量以及构造应力场分析的基础上,讨论了灵山岛褶皱构造的成因。灵山岛褶皱枢纽产状的一致性,共轭节理和褶皱轴面所反映的主应力方向的一致性,大褶皱与小褶皱之间的几何关系,明显具有构造成因的轴面劈理、窗棱构造、布丁构造等面理和线理构造,这些特征反映了灵山岛褶皱属于构造成因。综合区域资料分析认为,灵山岛褶皱构造是在NW-SE向挤压构造应力场的作用下结果,是古太平洋板块与亚洲陆缘俯冲碰撞的响应。

The fold tectonics in Lingshan island is developed and the types show various forms.Its origin type is still debated.Through geological mapping,based on the observation,measurement and analysis of of fold structural elements in Lingshan island,the origin of the fold structures in Lingshan Island has been discussed.The consistency of the occurrence of the folding hub in Lingshan Island,the consistency of the principal stress direction reflected by conjugate joints and folding axial planes,the geometric relationship between large and small folds,and the obvious structural origin of axial plane cleavage,window edge structure,pudding structure and other planar and linear structures reflect that Lingshan island folds belong to structural origin.Based on comprehensive regional data analysis,it is believed that the folding structure of Lingshan island is the result of compression tectonic stress field with the trend of NW—SE.It is a response to the subduction collision between the ancient Pacific plate and the Asian continental margin.