FABRIC FEATURES OF QUARTZ AND STRAIN ANALYSIS ON GNEISSIC GRANITE PLUTON IN SHUANGHE, DABIE

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.