桂东南地区断裂构造分形特征与金银成矿关系研究

Fractal Features of Fractures and Their Relation to Silver-Gold Mineralization in Southeast Guangxi

关键词:  金银成矿  断裂构造  分形

Key words:  silver-gold mine  fractal structure  fracture

摘要:

采用分形理论的盒维数方法,以研究区1:20万区域地质图和1:5万区域矿产图作为研究对象,并到野外进行实地调研作为补充,对桂东南地区北东向和北西向进行分形统计,并用计算机Surfer 7.0软件对分维值进行趋势分析。结果是:桂东南地区断裂分维值为1.61,鸡笼顶、望天洞等矿区分维值为1.62~1.82,属于断裂结构较复杂、构造活动性偏强地区,且北东向断裂分维值高于北西向断裂。金银矿化均落入分维高值区。矿带受北东向断裂分维梯度带控制,与陆川-岑溪断裂位置相一致,矿化密集区则集中于北西向断裂分维趋势的3个高值区,与北西向断裂叠加有关。桂东南地区断裂带中,南部比东北部对成矿更为有利。

Abstract:

The northeastern and northwestern of southeastern Guangxi are analyzed by the fractal dimension according to the geological map (proportion of 1:200000) and the mineral map (proportion of 1:50000) and the field survey.The fractal tendency is analyzed by the software of Surfer 7.0.It shows that the D value of fractal dimension of fracture in southeastern Guangxi is 1.61,and the D value of Jilongding and Wangtiandong ranges from 1.62 to 1.82.It is characterized by more complex fractures and strong structurally activity,and the D values of the northeastern fractures are bigger than that of the southwestern fractures.The analysis of the fractal tendency shows that nearly all the silver-gold mines are confined to high D value area.The ore zone is controlled by the fractal dimension grade region of the northeastern fracture structures,and is consistent with the position of Luchuang-Cenxi fracture.The dense regions of mineralization center at the three high sections of the fractal tendency of the northwestern fractures. This is related with the northwestern fractures superposed. It is more profited to find mines in the middle part and south part than in the northeastern part in southeastern Guangxi.