矿床地质2017，Vol.36Issue(4)：866-878,13.DOI:10.16111/j.0258-7106.2017.04.005
钦杭带南段庞西垌-金山银金矿田控矿构造分析及找矿指示
Ore-controlling structure analysis of Pangxidong-Jinshan silver-gold orefield,southern Qin-Hang belt: Implications for furthern exploration
摘要
Abstract
The Pangxidong-Jinshan silver-gold ore-field is located in Guangdong-Guangxi border area,belonging to the southern part of the Southern Qin-Hang belt.It consists of Pangxidong,Jinshan,Zhongsu,Zhugenpo,Gaocun silver-gold deposits and some other ore spots and was among the top ten planning silver ore concentration areas of China in the 1980s.The Pangxidong area has well developed ductile shearing zone and fractures due to multiphase tectonic-magmatic evolution.At least three stages of deformation can be identified since Indosinian.The first stage is dextral ductile shearing at 221 Ma dated by phengite in mylonite.The second stage is the sinistral ductile-brittle shearing that cut the late Yenshanian granites,characterized by NE-trending Pangxidong-Jinshan fault.The last stage is brittle fault.Recent studies suggest that the Pangxidong-Jinshan fault zone,a regional NE-SW-trending structure formed during the second stage,played an essential role in the formation and localization of the fault-hosted silver-gold veins systems.Regional sinistral ductile-brittle shearing of the PangxidongJinshan fault zone controlled the general occurrences and orientations of lodes and veins,and constrained the development of the internal structures,geometric details and final localization of lodes and veins.Therefore,the development and final localization of the silver-gold system can be comprehensively recognized in terms of both the Riedel shear system theory and the effects of the regional progressive deformation of sinistral ductile-brittle shearing,which may guide the further ore prospecting work in future.The D fracture is the most important orebearing structure.The lodes and veins belong to D fracture range lenticular sinistral en echelon in the main fracture.The R fracture and T fracture with en echelon arrangement mainly contain auriferous quartz veins.The R fracture shows intensive shear fractures output,with an angle of 15°～ 35° to the main fracture.T fracture shows nearly equidistant distribution,with an angle of 45° to the main fracture.关键词
地质学/银-金矿/控矿构造/韧脆性剪切/钦杭带/里德尔剪切Key words
geology/silver-gold deposit/ore-control structure/ductile-brittle shearing/Qin-Hang belt/Riedel shear system分类
天文与地球科学引用本文复制引用
林振文,周永章,秦艳,郑义,梁志鹏,邹和平,牛佳..钦杭带南段庞西垌-金山银金矿田控矿构造分析及找矿指示[J].矿床地质,2017,36(4):866-878,13.基金项目
本项目得到国家自然科学基金(编号:41502070)、中国科学院矿物与成矿重点实验室开放基金(编号:KLMM20150204)以及中国地质调查局工作项目(编号:1212011120831、1212011085412)资助 （编号:41502070）
