鄂东南铁山不对称鱼嘴状石香肠构造基质层中的应变分析  

STRAIN ANALYSES IN MATRIX OF ASYMMETRIC FISHHEAD-SHAPED BOUDINAGE IN TIESHAN, SE HUBEI

作　　者：储玲林[1] 李志勇[1] 曾佐勋[2] 

机构地区：[1]中国地质大学研究生院,武汉430074 [2]中国地质大学地球科学学院,武汉430074

出　　处：《地质科学》2006年第4期694-699,I0002-I0003,共8页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(批准号:49972068);国家理科基地创建优秀名牌课程项目;中国地质大学(武汉)教学研究项目部分成果。

摘　　要：利用惯量椭圆法对鄂东南铁山不对称鱼嘴状石香肠构造基质层中不同位置的方解石进行二维有限应变测量。运动学涡度以及相关参数的等值线分布图表明:不对称鱼嘴状石香肠构造基质层中的应变分布是不均匀的。基质层中,靠近断开的能干层处的剪切变形中纯剪切占优势,伸长方向趋向于平行剪切方向;而靠近连续的能干层处的剪切变形中简单剪切占优势,伸长方向趋向于垂直剪切方向。By the inertia moment ellipse method, strain ellipses of different positions in matrix of asymmetric fishhead-shaped boudinage in Tieshan, SE Hubei were studied. With parameters of the strain ellipses, true differential strain （ε1 -ε2 ）, ratio of ξ1 and ξ2 （ξ1/ξ2 ） and kinematic vorticity （ Wk ） were calculated, whose contour diagrams gave information of the distribution of deformation in matrix of asymmetric fishhead-shaped boudinage. In the matrix, pure shear was dominative in locations where strain was inhomogeneous, and the direction of elongation tended to parallel the shear direction near the disconnected intensified layer; while simple shear was dominative near the connected intensified layer, and the direction of elongation tended to perpendicular to the shear direction.

关 键 词：应变分析 不对称鱼嘴状石香肠构造 运动学涡度 鄂东南铁山 

分 类 号：P542[天文地球—构造地质学]