皖南-浙西地区盖层褶皱构造形迹特征  

Characteristics of Capping Fold Structure in the Southern Anhui and Western Zhejiang Regions

作　　者：陈秀其 周涛发[1] 李龙明[1] CHEN Xiuqi;ZHOU Taofa;LI Longming(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,Anhui China;Anhui Institute of Geological Survey,Hefei 230001,Anhui,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省地质调查院,安徽合肥230001

出　　处：《大地构造与成矿学》2018年第2期193-210,共18页Geotectonica et Metallogenia

基　　金：国家自然科学基金重大国际(地区)合作与交流项目(41320104003);中国地质调查局国土资源大调查项目(1212011120851;12120114039701)联合资助

摘　　要：前人对皖南-浙西地区古生代至早中生代盖层中发育的褶皱变形期次、特征和构造样式的认识尚存在较多分歧。本文通过区内盖层褶皱变形调查与解析,除印支早期褶皱和燕山期构造外,新识别出加里东期和印支晚期褶皱。加里东期褶皱样式主要表现为大型中常至开阔褶皱,且均为复式褶皱;次为小型紧闭褶皱,二者可能为从属性质。其构造线均呈近东西向或北东东向。印支早期褶皱样式主要为中常线形褶皱,其轴迹呈北东向;晚期表现为中常至开阔褶皱样式,轴迹呈北北西或近南北向。燕山期构造主要为盆地和断裂构造。早白垩世早期,表现为同沉积宽缓向斜,构造线呈近东西向;早白垩世之后,主要表现为断陷盆地和断裂构造,构造线呈北东或北北东向。各期褶皱叠加明显,形成"L"或"厂"字型组合特征,或形成构造穹窿-盆地组合。深入研究构造特征及演化规律,对区域构造格架建立具有重要意义。There exist different viewpoints on the characteristics of the Paleozoic to early Mesozoic strata in the southern Anhui and western Zhejiang district,including deformation period,process and fold shape.On the basis of detailed folding deformation survey and analysis,we identified the Caledonian fold and late Indosinian fold structures in the study area,besides the previously recognized early Indosinian and early Yanshanian folds.The Caledonian folds mainly exhibit as large(mapping scale)medium-open complex folds and their subordinate small tight folds(outcrop).The Caledonian structure line of the capping fold strata in the study area is NEE or nearly E-W trending.The early Indosinian folds mainly occur as medium linear folds of NE trending,while the Indosinian folds are mainly medium open fold of NNW or NNE trending.The early Cretaceous folds are mainly nearly E-W trending depression loose synclinal basins.During the late Cretaceous,the study area switched to an extensional regime which is characterized by NE or NNE trending faulted basins and normal fracture systems.The southern Anhui and western Zhejiang district experienced complicated structural evolution from the Cambrian to Cretaceous periods,and exhibited“L”or“T”shape structural features,and tectonic dome-basin combinations.

关 键 词：加里东运动 中生代构造运动 构造样式 斜跨叠加 陆内造山作用 皖南-浙西 

分 类 号：P542[天文地球—构造地质学]