湘中地区穹盆构造:褶皱叠加期次和成因  

Dome-and-Basin Pattern in Central Hunan Province:Stages and Genesis of Fold Superposition

作　　者：王建[1] 李三忠[1] 金宠[1] 王岳军[2] 张国伟[3] 刘丽萍[1] 刘鑫[1] 

机构地区：[1]中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室,山东青岛266100 [2]中国科学院广州地球化学研究所,广东广州510640 [3]西北大学地质学系,陕西西安710069

出　　处：《大地构造与成矿学》2010年第2期159-165,共7页Geotectonica et Metallogenia

基　　金：中国石化总公司重大科技攻关项目"中国南方(中上扬子)大陆构造与海相油气前景(G0800-06-ZS281)"资助

摘　　要：研究认为湘中地区存在三套不整合面,划分了四个构造变形期次:加里东期、印支早期、印支晚期和燕山期,并对各个构造期次的变形特征作了详细的论述。加里东期与印支早期分别为近东西向的褶皱,印支晚期为一近似平行于祁阳弧断裂的弧形构造,燕山期则以北东—北北东向的左旋走滑为主。通过分析各构造期次的复合叠加特征,本文提出:湘中地区的穹盆构造是由于加里东期褶皱与印支期褶皱叠加而形成的,并在燕山期时受到北东—北北东向的左旋走滑断层的改造。There are three groups of angular unconformities in central Hunan Province. They are unconformities between Devonian and Carboniferous strata with underlying Lower Paleozoic,between Upper Triassic-Lower Jurassic strata with underlying strata,and between Cretaceous strata with underlying strata,respectively. Similarly the deformation is divided into three stages：Caledonian,Early Indosinian,Late Indosinian and Yanshanian,producing four structural levels. Each structural level has distinct characteristics. Caledonian and Early Indosinian folds strike in E-W. The Qiyang arc-shape structure occurred in Late Indosinian period. However,the sinistral strike-slip faults with northeast-north to northeast strikes formed in the Yanshanian period. By analyzing the characteristics of fold superposition,this paper proposes that the structural type of dome-and-basin in central Hunan Province was resulted from one-stage Caledonian and two-stage Indosinian fold superpositions,being reformed by the Yanshanian sinistral strike-slip faulting.

关 键 词：穹盆构造 褶皱叠加 加里东期 印支期 燕山期 

分 类 号：P542[天文地球—构造地质学]