摘要
定结地区位于喜马拉雅造山带中段 ,发育有多方向、多尺度、多层次、多期次的韧性剪切带。在剪切带中 ,各种韧性变形组构极为丰富 ,表明剪切带岩石的变形主要为韧性变形机制所致。变形岩石类型为花岗质糜棱岩、长英质糜棱岩和硅质糜棱岩 ;由于岩石受糜棱岩化作用程度的不同 ,在韧性剪切带中发育糜棱岩化岩石、初糜棱岩、糜棱岩及超糜棱岩 ;剪切带岩石的变形温度为 2 0 8～ 5 5 9℃。
Since the Dingjie Area lies in the middle of Himalayan Orogen Belt in the south of Qinghai Tibet Plateau, it is the key place to study the development and uplifting of Himalaya. In the area, there form many kinds of ductile shear zones defined by their orientation, scale and stage. Within the deformed rocks in these ductile shear zones, there develop so abundant deformational textures such as larsen lineation,rotational porphyroclast,S C fabrics, domino structure, and so on, which shows the deformation of rocks in shear zones mainly resulted from the ductile deformation mechanism. And the deformed rocks are granite mylonites, feldspar quartz mylonites and super mylonite which were formed in the ductile shear zone. Temperature for deformation of ductile shear zone ranges from 208℃ to 559℃.
出处
《地学前缘》
EI
CAS
CSCD
2003年第2期479-486,共8页
Earth Science Frontiers
基金
国土资源部 1:2 5万定结幅 (H45C0 0 40 0 3 )区域地质调查项目 ( 2 0 0 0 13 0 0 0 14 5 )
关键词
定结地区
韧性剪切带
糜棱岩化作用
喜马拉雅造山带
温度
ductile shear zone
brittle ductile deformation
mylonite
Dingjie Area
Himalayan Orogen Belt
