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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第33卷

期数:

2011年第01期

页码:

54-63

栏目:

基础地质与矿产地质

出版日期:

2011-03-15

文章信息/Info

Title:

Geological Structure Analysis of Zhenba-Xiagaochuan Area in the Northwest Section of Southern Dabashan

文章编号:

1672-6561(2011)01-0054-10

作者:

刘战庆¹; 2; 裴先治¹; 2; 丁仨平¹; 2; 李佐臣¹; 2; 李瑞保¹; 2; 陈有¹; 2; 刘智刚¹; 2; 张晓飞¹; 2; 陈国超¹; 2; 王学良¹; 2

1.长安大学 地球科学与资源学院,陕西 西安 710054; 2.长安大学 西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054

Author(s):

LIU Zhan-qing¹; 2; PEI Xian-zhi¹; 2; DING Sa-ping¹; 2; LI Zuo-chen¹; 2; LI Rui-bao¹; 2;  CHEN You-xin¹; 2; LIU Zhi-gang¹; 2; ZHANG Xiao-fei¹; 2; CHEN Guo-chao¹; 2; WANG Xue-liang¹; 2

1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education,Chang'an University, Xi'an 710054, Shaanxi, China

关键词:

南大巴山; 镇巴—下高川地区; 构造解析; 逆冲推覆; 右行走滑; 动力学机制

Keywords:

Southern Dabashan;  Zhenba-Xiagaochuan Area;  structure analysis;  thrust;  right-type strike-slide;  dynamic mechanism

分类号:

P541

DOI:

-

文献标志码:

A

摘要:

在南大巴山西北段镇巴—下高川地区进行1:50000地质填图基础上,通过对地质构造现象野外的详细观测,运用持平投影的构造几何学和运动学等方法对主要断层面擦痕和断层两侧不对称褶皱枢纽以及褶皱两翼产状进行统计分析和构造解析,结合区域沉积资料和地质年代学资料,对该区构造进行构造序列分析,并探讨南大巴山构造带的变形时限、动力学机制及其演化。研究表明:南大巴山西北段镇巴—下高川地区断裂构造特征表现为高角度逆冲推覆兼有右行走滑性质的叠瓦式逆冲推覆构造;与逆冲推覆构造相关褶皱多为轴面东倾西倒的同斜褶皱和斜歪褶皱,而且由东向西褶皱紧闭程度逐渐减弱,表明逆冲推覆方向由东向西,扩展方式为前展式。该区是在印支期扬子地块与秦岭造山带全面碰撞造山作用基础上,在燕山期中—晚期整个大巴山构造系由北东向南西方向大规模的陆内造山,形成了现今的构造几何形态,其中右行走滑构造是燕山期中—晚期(J₃-K₂)逆冲推覆构造持续向西南推移过程中形成的。

Abstract:

On the basis of geological mapping with the scale 1:50 000 of Zhenba-Xiagaochuan Area in the northwest section of Southern Dabashan, the field occurrences of the hinge lines and two limbs of the asymmetry folds were analyzed in tectonic statistics by the means of detailed wild-field observations and measurement and stereographic method. With regional sedimentary and geological age data, the mechanism of tectonics and dynamics and the evolution of Southern Dabashan were discussed with structural sequences analyzing of its structural geometry and kinematics. The results showed that the northwest section of Southern Dabashan in Zhenba-Xiagaochuan Area was characterized by high-angle thrust with imbricate thrust fan-type nappe of right-type strike-slide in structure; the folds related to thrust fan-type nappe were predominated by the syn-incline and inclined ones with its axis planes incline to the east and the angles between limbs of which became larger and large from east to west, representing their thrust direction and indicating forward developing. Thus, it is believed that the thrust in the area, which inherited from previous complete collision between Yangtze Plate and Qinling orogenic belt in Indosinian, was ultimately forged through large-scale thrust of intra-continental collisions of the whole Dabashan tectonic belt from northeast to southwest during middle-late period of Yanshanian, in which the present structural model of Zhenba-Xiagaochuan Area was brought out, and the right-type strike-slide structure grew in the continuous process of movement of the thrust towards southwest during middle-late period of Yanshanian(J₃-K₂).

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备注/Memo

备注/Memo:

收稿日期:2010-04-20
基金项目: 国家自然科学基金项目(40972136; 40572121); 中央高校基本科研业务费专项资金项目(CHD2009JC053; CHD2009JC070); 中国石油化工股份有限公司海相前瞻性研究项目(YPH08006)
作者简介: 刘战庆(1975-),男,陕西蒲城人,理学博士研究生,从事构造地质和区域地质研究。E-mail:liu_zq100157@sohu.com

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更新日期/Last Update: 2011-03-20