旋卷状构造组合演变进程  

The Evolution Process of Vortex-shaped Structural Assemblages

作　　者：方茂龙[1] 张玉双[1] 李瀚波[1] 

机构地区：[1]核工业北京地质研究院,遥感信息与图像分析技术国家级重点实验室,北京100029

出　　处：《铀矿地质》2018年第1期25-31,52,共8页Uranium Geology

基　　金：中国核工业地质局铀矿地质科研项目“内蒙古宝昌-多伦地区铀成矿重点地段遥感构造解译与研究”(编号:2016-76)资助

摘　　要：笔者提出了"旋卷状构造组合"(简称"旋卷状构造")的概念及其型式。旋卷状构造组合演变过程的研究表明,其成因与平行剪切作用下的普遍变形方式——层状岩石的层间走滑和褶皱作用密切相关;各组成要素形成于层间走滑和褶皱作用的不同发展阶段;不同的构造型式由不同的组成要素组合而成,它们都是这一演化过程中的系列产物,其中"涡轮状构造组合"为其最完整的构造型式。较为完整的旋卷状构造组合型式中还常具有核湾、两分面、切出虚脱区和扭折三角区等反映平行剪切成因特点的伴生构造特征。文章着重对其中最为完整的"涡轮状构造组合"的演变进程(模式)、鉴定标志及其形成时的平行剪切指向进行了探讨。This paper put forward the concept and the types of vortex-shaped structural assemblage(or vortex-shaped structure).The studies on the evolving process of small vortex-shaped structures indicated that the genesis of vortex-shaped structures is closely related to the commonest way of deformation under parallel shearing from the interlayer strike to slipping and folding of stratified rocks.Every type of vortex-shaped structures,as one of the series products in the evolving process,is the assemblage of different geometric elements which were gradually formed and developed at different evolving stages.The most developed type which is a type with all geometric elements and a perfect form which is the turbineshaped structures.In addition,well developed types are usually characterized by a C-bay(a bay-shaped structure of a fold core destroyed by faults),a half-dividing plane(a compounding strike-slipping fault plane dividing the vortex-shaped structural assemblage into halves),a fault empty area(a crescent tensile space or its deformed shape resulted from a branch shearing fault)and a fault triangle area(a triangle tensile area bounded by three shearing faults),which show the types originated from parallel shearing.The evolving process(mode),identification marks and the shear sense of the turbine-shaped structures was mainly discussed in this paper.

关 键 词：旋卷状构造 平行剪切 剪切指向 演变进程 旋卷构造 

分 类 号：P313[天文地球—固体地球物理学]