利用变形花岗岩体中的长石矿物进行有限应变测量初探

The study of the limit deformation measurement with deformation feldspar in granite areas

岩石有限应变测量的方法较多,相比之下,"长短轴法"最简单、快捷,野外易于操作,但是对所选的对象变形前要求近圆形,或者椭圆形,且随机分布。花岗岩区很难找到满足此条件的颗粒。在《1∶25万玉门镇幅》调研的过程中,试以长石颗粒为研究对象,进行长短轴法变形测量,将其结果与相邻变形砾石、杏仁体和包体测量结果进行对比,发现它们具有相似的应变椭圆轴率,证实在变形花岗岩区可以用变形长石颗粒研究区域变形的特点。

Long-short axis is one of the most simple , prompt and operational methods among the limited deformation methods in outdoors . It requires studies as a circular section or circular section of strain ellipsoid and normal distribution before their deformations . But it is difficult to find the criterion particle in granite areas . In the 1∶250000 regional geological mapping of Yumenzhen, the authors studied deformation feldspar by long-short axis measurement method , compared with the deformation gravel , deformation amygdale , deformation relict long-short axis measurement , then found the both measurements were similar to deformation axis . It has been proved that deformation feldspar can be studied as to an area deformation characteristic of Yumenzhen.