基于断裂构造遥感影像特征对比分析的花山岩体与姑婆山岩体成因关联性探讨

Discussion on genetic correlation between Huashan granite body and Guposhan granite body based on comparative analysis of fault structure features in remote sensing image

花山花岗岩体与姑婆山花岗岩体是广西桂东地区相邻的2个花岗岩体,与该地区多金属成矿的关系密切,探明它们的成因关系对扩大桂东地区有色金属矿产资源的找矿前景具有实际意义。由于花岗岩体断裂构造的形成与花岗岩体成岩地质作用关系密切,因而通过其空间分布特征来分析比较相邻岩体的断裂构造特征有助于对岩体成因关联性的探讨。以ETM+遥感图像为信息源,在对花山和姑婆山花岗岩体遥感图像开展了SN,EW,NE和NW这4个方向的线性构造信息提取基础上,对2个岩体的遥感线性构造进行了对比统计分析、对比玫瑰花图分析、对比等密度图分析以及对比趋势面模拟岩体断裂构造应力场分布分析,最后通过综合分析获得2岩体在成因上所具有的关联性及差异性。

Huashan granite body and Guposhan granite body are two neighboring granite bodies in Guidong area of Guangxi. They are closely related to the polymetallic mineralization of the area. The study of their formation is of practical significance for expanding prospecting for the non-ferrous metal mineral resources in Guidong area. As the fault structure was genetically closely related to the igneous geological action of the granite body, the authors investigated their spatial contact characteristics so as to help the discussion of the genetic correlation between the granite bodies. Using the ETM＋ remote sensing image as the source of information and based on extracting the linear structure information in four directions, i. e. , SN, EW, NE and NW, from the remote sensing images of Huashan and Guposhan granite bodies,the authors carried out the comparative statistical analysis,comparative rose diagram analysis and comparative equi-density map analysis as well as comparative structural stress field analysis of the fractures through trend surface simulation of the remote sensing linear structure in the two rock bodies. Finally,the genetic relevance and difference between the two rock bodies were detected through the comprehensive analysis.