摘要
东山峰背斜是湘鄂西褶皱冲断带的一部分,剖面构造为基底和盖层组成的双层结构。由于江南-雪峰基底拆离推覆隆起带向NW方向的推挤,导致湘鄂西区沉积盖层沿南华系和震旦系陡山沱组下段、寒武系牛蹄塘组、志留系龙马溪组等三个主滑面发生了三个层次的滑脱和褶皱,形成自底部滑脱层向上传播的以前展式的正向(倾向SE)冲断系。铅锌矿的产出层位与矿源层的分布层位有一定的依存关系,寒武系下统牛蹄塘组是区内主要的铅锌矿源层,矿源层与构造形迹共同控制了东山峰背斜范围内的铅锌矿分布。背斜两翼构造形迹的不同,造成了两翼铅锌矿化特征的差异,背斜西部轴部转折区带是最具找矿潜力的部位。
The Section plane of Dongshanfeng anticline is composing of two-layer of basement and cover structure,which is belong to fold-and-thrust belt in west of Hunan,Hubei province.As a result of the north-west squeezing of Jiangnan-Xuefeng basement decoupling-nappe uplift belt,the sedimentary cover of west of Hunan,Hubei province had formed a forward propagation positive thrust fault system（dip to southeast） slipping from bottom-layer to the up,which is composing of three level of detachment and fold along Nanhua and Sinian system Doushantuo Formation,Cambrian Niutitang Formation,Silurian Longmaxi Formation.The Cambrian Niutitang Formation is the source rock of lead-zinc deposit,and the source rock and structure characteristics together control the distribution of the lead-zinc deposits in the Dongshanfeng anticline area.The different structure feature of two limbs of Dongshanfeng anticline resulting in different lead-zinc mineralization feature of both sides,and turning part of western anticline axis is the most potential prospecting area.
出处
《华南地质与矿产》
CAS
2010年第1期30-35,共6页
Geology and Mineral Resources of South China
基金
国土资源大调查项目(编号:1212010732006)
关键词
铅锌矿化特征
找矿潜力部位
东山峰背斜
湘鄂西褶皱冲断带
fold-and-thrust belt in west of Hunan
Hubei province
Dongshanfeng anticline
the corridor section structure
lead-zinc mineralization
prospecting potential area
