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川东与大巴山褶皱冲断带交汇区构造几何学和运动学特征
投稿时间:2018-12-22  修订日期:2019-06-20  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020005
摘要点击次数: 72
全文下载次数: 75
作者单位E-mail
文凯 中国地质大学北京能源学院 北京 100083 m18801328513@163.com 
李传新 中国地质大学北京能源学院 北京 100083 chuanxin_li@163.com 
基金项目:国家重点自然科学基金——四川盆地东部多重滑脱构造变形系统;国家青年科学基金——四川盆地东北缘构造几何学和运动特征
中文摘要:川东与大巴山褶皱冲断带交汇区位于四川盆地东北缘,由温泉井—马槽坝背斜带、云安场背斜带和方斗山背斜带组成,其形成过程受川东构造带和大巴山构造带的双重控制,开展川东与大巴山褶皱冲断带交汇区构造几何学和运动学特征研究,对认识华南板块和华北板块之间的拼贴碰撞及演化具有重要意义。本文基于野外调查、钻测井资料和二维地震资料,以断层相关褶皱理论为指导,通过对四条二维地震剖面的精细解析,揭示了交汇区构造几何学特征,并应用2Dmove 软件恢复了研究区构造运动学过程。研究认为:(1)交汇区在南北方向上显示为大型的复向斜结构,垂向上被区内下三叠统嘉陵江组膏盐层、志留系泥页岩层和下寒武统泥页岩层三套滑脱层分为上、中、下三大构造层,上构造层主要发生滑脱褶皱变形,中、下构造层发育断层较多,主要发育双冲构造、冲起构造以及断层转折褶皱;(2)研究区中构造层构造变形最为强烈,构造缩短率达10%,上、下构造层构造缩短率较小,均为6%左右,且各构造层缩短率由西到东呈现出逐渐增大的趋势;(3)中生代以来,研究区的构造演化过程分为三个阶段:晚三叠世到晚侏罗世稳定沉积阶段、早白垩世到古近纪早期对冲变形阶段、古近纪晚期至今定型阶段。
中文关键词:川东  大巴山  构造交汇带  几何学  运动学  多层次滑脱变形
 
Geometry and kinematics of the intersection area of eastern Sichuan and Dabashan fold-thrust belt
Author NameAffiliationE-mail
Wen Kai School of Energy Resources,China University of Geosciences m18801328513@163.com 
Li Chuanxin School of Energy Resources,China University of Geosciences chuanxin_li@163.com 
Abstract:The intersection area of eastern Sichuan and Dabashan fold-thrust belt is located in the northeastern Sichuan Basin and is composed by Wenquanjing-Macaoba anticline belt, Yunanchang anticline belt and Fangdoushan anticline belt. The formation and evolution of the intersection area is controlled by eastern Sichuan structural belt and Dabashan structural belt. Therefore, this study is very meaningful to understand the collision relationship between the South China plate and the North China plate and its evolution process. Based on field investigation, drilling data, logging curves and 2D seismic data, guided by fault related folding theory, this paper revealed the geometric features of the intersection area with four seismic profiles which are interpreted precisely and restored the tectonic kinematics process of the study area by using 2Dmove software. This paper draws the following conclusions: (1) the intersection area shows a giant synclinorium structure in the south-north directions and be divided into three structural layers in vertical direction by three detachment layers which are the gypsum-salt bed of Lower Triassic Jialingjiang formation, the mudstone and shale of Silurian and the mudstone and shale of Lower Cambrian. The upper structural layer mainly occurs decollement deformation, whereas there are many faults in the middle and lower structural layers where developed duplex structures, pop up structures and fault-bend folds. (2) In the study area, the deformation of the middle structural layer is the strongest, with a structural shortening rate of 10%, and the shortening rates of upper and lower structural layers are relatively small, both of which are about 6%. Meanwhile, the shortening rate of each structural layer increases gradually from west to east. (3) Since the Mesozoic, the evolution of the study area has been divided into three stages: stable sedimentary stage from late Triassic to late Jurassic, opposite thrusting stage from early Cretaceous to early Paleogene and the shaping stage from late Paleogene to present.
keywords:eastern Sichuan basin  Dabashan  the intersection area  geometry  kinematics  multi-detachment deformation
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