安徽张八岭隆起区金矿床构造控矿规律  

Structural Controls on the Location of Gold Deposits in Zhangbaling Uplift in Anhui Province

作　　者：陈梦婷[1] 石文杰[1] 肖国洪 熊乐[1] 赵玉京 

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]广西高龙黄金矿业有限责任公司,广西田林533300

出　　处：《地质科技情报》2016年第6期157-166,共10页Geological Science and Technology Information

摘　　要：安徽张八岭隆起区内成矿期构造是郯庐断裂带长期性、多阶段活动的产物。以该区西张郢和瓦屋刘金矿床为研究对象,根据野外地质测量,共厘定出4种与成矿有关的断裂构造,分别为NWW向、近SN向(管店-下马断裂、宋圩-石店子断裂)、NW向和NNE向断裂构造。其中NWW向断裂与近SN向断裂(管店-下马断裂、宋圩-石店子断裂)规模较大,为郯庐左行走滑断裂带的派生构造,前者为右行扭压断裂,后者为左行扭张断裂;二者控制了矿床(点)的区域分布,是主要的导矿构造。NW向断裂主要分布于西张郢矿区,为NWW向断裂的次级断裂,成矿期受扭张性应力作用,使张八岭群片理构造发生活化,形成顺层滑动破碎带;NNE向断裂主要分布在瓦屋刘矿区,为近SN向断裂(管店-下马断裂、宋圩-石店子断裂)的次级断裂,成矿期在扭压性应力作用下形成挤压破碎带。NW向断裂及NNE向断裂均为成矿提供了有利空间,是张八岭隆起区内重要容矿构造,控制了矿体的空间展布、形态及产状,使矿体在平面上具有平行斜列,近等距性分布特征,垂向上具有南西向侧伏,尖灭再现、尖灭侧现规律。在对张八岭隆起区断裂构造特征分析的基础上,探讨了断裂构造对成矿的控制作用,总结了控矿规律,建立了张八岭隆起区构造控矿模式。The metallogenic structure of Zhangbaling uplift has close relationship with famous Tan-Lu fault zone, and is caused by long-term and multi-stage activities of Tan-Lu fault zone. Two typical ore deposits, Xizhangying and Wawuliu, are controlled by faults in the study area. Based on the field geological survey of the two ore deposits, we divide the faults related to the mineralization into four types, strking NWW, SN （Guandian-Shidianzi fault）, NW and NNE, respectively. NWW and SN-striking faults are second-order faults of Tan-Lu strike-slip fault zone. Both of them are large scale and work as the passageway of the orefluid and metals. But they have different kinematical properties, with the former being a right shear- compressor fault, and the latter, a left shear-tensor fault. NW-striking faults mainly distributed in the Xizhangying gold deposit, are second-order faults of NWW-striking faults. The shear-tensional stress in the metallogenic period activates schistosity structure of Zhangbaling Group to form the interlayer-gliding fracture zone. NEE-striking faults mainly distributed in the Wawuliu gold deposit, are second-order faults of SN-striking faults. The shear-compressor stress in the metallogenic period results in the compressed fragmentized zone. Both of interlayer-gliding fracture zone and compressed fragmentized zone provide a beneficial space for mineralization, and control the spatial distribution of mineralization and the shape as well as the attitude of ore body, as the important host structures. Ore bodies are found in groups arid distributed zonally, approximately equal in distance in the plane, and are characterized by strong orientation and discontinuity in vertical section. Based on the analysis of fault structural characteristics in Zhanghaling uplift,we discuss the importance of the fault structure for mineralization, summarize the tectonic ore con trol regularity and establish the model of structurally controlling mineralization.

关 键 词：张八岭隆起区 金矿 控矿特征 构造控矿模式 

分 类 号：P618.51[天文地球—矿床学]