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为查明构造性质不明、空间位置不清楚的南海北缘琼南缝合带西段——九所-陵水断裂带,采集断裂带东段小妹韧性剪切带中花岗岩、石榴石石英片岩和花岗质片麻岩3类样品,探讨其纳米尺度特征.扫描电镜(scanning electron microscope,SEM)观测结果表明:这3类岩石存在多种纳米结构和构造,结合野外实践得到的该剪切带纳米颗粒的发育程度与其所受剪切作用有关.纳米颗粒的形成机制可能有:(1)剪切力作用下层状硅酸盐热分解;(2)颗粒塑性变形后发生脆性破裂,再经剪切作用研磨而成.与台湾太鲁阁深大断裂带中的韧性剪切带岩石样品进行SEM测试结果对比,发现其纳米颗粒特征和研究区具可比性,据此推测小妹韧性剪切带在区域构造归属上可能与九所-陵水深大断裂带密切相关.
In order to find out the western segment of the South Qionglai suture in the northern margin of the South China Sea with unknown tectonic properties and the location of the space, the Jimei-Lingshui fault zone was collected to collect granite, garnet quartz schist and granite in the Xiaomei ductile shear zone in the eastern segment of the fault zone Quality gneiss, and their nanoscale features were investigated.The results of scanning electron microscopy (SEM) showed that there are many kinds of nanostructures and structures in these three kinds of rocks, and combined with the field practice of the shear band nanoparticles (1) thermal decomposition of phyllosilicate under the action of shear stress; (2) brittle fracture occurs after plastic deformation of granule, and then shear .Compared with the SEM results of the ductile shear zone rocks in the Taroko deep fault zone in Taiwan, it is found that the characteristics of the nano-particles are comparable with those in the study area. Therefore, it is inferred that the ductile shear zone in the younger sister Belonging to regional tectonics may be closely related to the Jiujiang-Lingshui deep fault zone.