绍兴—江山断裂带璜山段岩石有限应变测量成果初析

作者在绍兴—江山断裂带的基底韧性剪切带内,测量了大量的岩石有限应变数据,经分析认为该韧性剪切带具有不均匀的单剪应变特征,其位移场属于RamsayⅠ类,应变类型为压扁型。长短轴比值、剪切应变值和应变程度值等,均由剪切带中心往外递减,剪切指向平面上为左旋,纵向拉伸变形量为102.1km,磺向缩短量为5.76km,水平剪切总位移量为42Km。

THE RESULTS OF FINITE STRAIN MEASUREMENTS OF THE ROCKS IN THE HUANGSHAN.SECTOR OF THE SHAOXING-JIANGSHAN FRACTURE ZONE

The authors have obtained a lot of rock finite strain data from a basement ductile shear zone in the Shaoxing-Jiangshan fracture zone. Analysis shows that this ductile shear zone has the features of inhomogeneous simple shear strain. Its displacement field belongs to Ramsay Ⅰ type and the strain is of flattening type. The ratio of the long axis to short axis, shear strain value and strain intensity decrease from the center of the shear zone outwards and shear direction is sinistral in plan. The longitudinal extension is 102.1 km, the lateral shortening is 5, 76 km, and the horizonatal shear displacement is 42 km.