江南造山带北缘鄣公山地区逆冲-推覆构造特征  

Characteristics of thrust-nappe structures in the Zhanggongshan area, northern margin of the Jiangnan orogen

作　　者：张彦杰[1] 周效华[1] 廖圣兵[1] 余明刚[1] 蒋仁[1] 姜杨[1] 朱清波[1] 

机构地区：[1]中国地质调查局南京地质调查中心,南京210016

出　　处：《资源调查与环境》2013年第2期71-79,共9页Resources Survey & Environment

基　　金：中国地质调查局"安徽1:5万平里;江潭;瑶里;虹关幅区调"项目(1212010610609)

摘　　要：江南造山带东端北缘皖赣相邻的鄣公山地区广泛分布一套浅变质强变形的新元古代早期火山-沉积岩系。区内自晋宁主造山期以来历经多期构造变形、岩浆活动、变质作用和沉积作用。本文着重对鄣公山地区陆内造山阶段形成的逆冲-推覆构造进行讨论,区内北东-北东东向展布的、自北向南多层次中高角度叠瓦式逆冲-推覆构造为最显著的构造变形,由瑶里-鄣源-江潭为主逆冲-推覆断层的北部平里-凫峰逆冲-推覆系和以清华-官坑-五城断裂为主逆冲-推覆断层的南部鄣公山-漳前逆冲-推覆系,以及它们内部次级叠瓦状逆冲断层组合而成。逆冲-推覆构造主体形成于早燕山期。逆冲-推覆体自北向南增生,具前展式扩展方式,推覆体属未脱离"母体怀抱"的短距离运移。逆冲-推覆构造形成于印支-南海板块向北强烈推挤的区域动力学背景下。A suite of low-grade metamorphic and strong deformed Early Neoproterozoic volcanic-sedimentary rocks are widely distributed in the Zhanggongshan area the adjacent region of Anhui and Jiangxi Provinces, northern margin of the eastern section of the Jiangnan orogen. Multi-stages of structure deformation, magmatism, metamorphism and sedimentation had happened in this area since Jinninian period. Thrust- nappe structures developed in the intra continental orogenic stages in this area are emphatically introduced in this paper. The NE-NEE trending high-angel trust-nappe structures multiphasically imbricated from north to south are the most significant tectonic deformation in this area. The thrust-nappe structures are composed of Pingli-Fufeng thrust-nappe system in the north of taking Yaoli-Zhangyuan-Jiangtang main thrust-nappe fault, Zhanggongshan--Zhangqian thrust-nappe system in the south of Qinghua--Guan- keng--Wucheng main thrust-nappe fault and their secondary imbricate thrust faults. The thrust-nappe system mainly formed in the Early Yanshanian had experienced accretion from north to south with an ad- vance spreading form, and the nappes not yet separated from the main thrust-nappe faults only moved in short distances. The thrust-nappe structures were formed in the regional dynamic setting of northward strong compressional actions of Indosinian-Nanhai plate.

关 键 词：逆冲-推覆构造 印支-早燕山期 江南造山带 鄣公山地区 

分 类 号：P542[天文地球—构造地质学]