摘要
对大别山双河片麻状花岗岩岩体中的石英C轴组构、黑云母 (0 0 1 )解理极点和石英颗粒三维应变分别进行系统测量。结果显示 ,双河岩体在侵位和后期演化过程中以挤压变形为特点 ,岩体经过NW—SE向和NE—SW向两次挤压 ,NW—SE向挤压强度较大 ,奠定了岩体基本的构造形态。结合区域应力场特征分析得出 ,双河岩体在早三叠世至早侏罗世应力方位为NW—SE向挤压 ,中侏罗世及后期为NE—SW向挤压 ,应力场发生顺时针变化。
Systematic measurements are made respectively on the quartz C-axis fabric, biotite (001) cleavage fabric and 3-D strain analysis by quartz for gneissic granite in Shuanghe, Dabie. The results show that Shuanghe gneissic granite pluton is characterized by compression during its emplacement and the subsequent evolution, and it has been compressed along NW-SE and NE-SW orientation, with the NW—SE orientation more strongly compressed. which develops the fundamental structure pattern of the pluton. Combining with the regional stress fields, the Shuanghe pluton recorded the Early Triassic and Early Jurassic NW—SE compression, Middle Jurassic and later NE—SW compression. Stress fields show a clockwise change of compression directions.
出处
《地质力学学报》
CSCD
2002年第2期149-155,共7页
Journal of Geomechanics
基金
国家自然科学基金 (编号 :40 172 0 6 9)
