西大别地区韧性剪切带的卫星影像研究

STUDY OF THE SATELLITE IMAGE OF SHEAR ZONES, WEST DABIE MT.

对发育在西大别地区的韧性剪切带的卫星影像分析表明：异常色带及均匀的线状影像纹理是其突出的影像特征。色调异常带可区分为浅色、暗色与明暗界面三种异常类型。通过多地段、多地质体和不同构造部位的线状体方位的统计对比，叠加在早期韧性剪切带之上的后期岩石破裂被有效地分离。自相似性统计获得剪切带上的分维值Ｄ为１．０５～１．３（＞１），非剪切带上Ｄ为０．８～０．９９（＜１），Ｄ＝１基本可作为韧性剪切带与非韧性剪切带之间界定的统计标尺。

This paper analyses the satellite of the shear zones within west Dabie Mt.,It presents: the best outstanding character of shear zones in abnormal colour zones and homogeneous linear image features.Three types of abnormal colour zones(lingt, dark and the section between light and dark) are distinguished. By the directional statistical comparation of linear image lying on polyareaspolyrock bodies and different structural parts,the late fractures of rocks adding to early shear zone are effectively seperated. Self-similar statistics obtain that fractal dimension (D) is 1.05￣1.3(>1) in shear zone, but 0.8￣0.99(<1) in nonshear zone, D=1 is a basic ruler which divides shear zone and nonshear zone.