地质论评2017，Vol.63Issue(6)：1429-1439,11.DOI:10.16509/j.georeview.2017.06.001
华北克拉通北缘医巫闾山韧性剪切拆离带的运动学涡度与韧性减薄量
The Kinematic Vorticity and the Ductile Thinning of the YiwulüShan Ductile Shear Detachment Zone in North China Craton
摘要
Abstract
Objectives:The Yiwulüshan ductile detachment shear zone is located on the northern North China Craton,and strike NE,dips to W—NW,and consists of footwall which composed of ductile shear zone (mylonite zone) and no deformation Mesozoic granite pluton,brittle detachment fault and hangwall sedimentary rocks.In this paper,we focus on the ductile thinning with the Yiwulüshan ductile detachment shear zone.Methods:we use the strain measurement and Polar Mohr diagram to estimate the strain and the kinematic vorticity (Wk) values,and estimate the values of ductile thinning of the Yiwulüshan ductile detachment shear zone.Result:The results of strain measurement using the feldspar porphyroclasts of mylonite within the ductile zone shows the principal axes X ＞ Y (≈ 1) ＞ Z of the strain ellipsoids and that the X-axis is lengthening,the Y-axes is remaining unchanging and the Z-axes is shortening.The kinematic vorticity (Wk) values,estimated by the Polar Mohr diagram,changed from 0.61 to 0.96 with an average of 0.80,which suggest that the Yiwulüshan ductile detachment zone experienced simple-dominated general shearing.Conclusions:Based on The strain measurements and kinematics vorticity estimation,the ductile thinning of Yiwulüshan ductile detachment shear zone ranged from 10％ to 40％ alone the sense of detachment.It suggests that it has a positive correlativity between the ductile thinning and strain intensity has,and a negative correlativity with the kinematic vorticity.关键词
拆离带/有限应变/运动学涡度/韧性减薄量Key words
the detachment zone/the finite strain measurement/kinematic vorticity/the quantities of ductile thinning引用本文复制引用
李建波,郭磊,鲁勇花,曾涛..华北克拉通北缘医巫闾山韧性剪切拆离带的运动学涡度与韧性减薄量[J].地质论评,2017,63(6):1429-1439,11.基金项目
本文为国家自然科学基金资助项目(编号:41662014和41102129)的成果.This study was supported by National Natural Science Foundation of China (Grant No.41662014 and 41102129). （编号:41662014和41102129）
