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地质科学  2012, Vol. 47 Issue (1): 22-36    DOI:
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鄂西弧形构造变形特征及成因机制
王平1, 刘少峰2, 王凯3, 郜瑭珺4
1. 南京大学地球科学与工程学院 南京 210093;
2. 中国地质大学地质过程与矿产资源国家重点 实验室 北京 100083;
3. 西安地质矿产研究所 西安 710054;
4. 中国石化勘探南方分公司 成都 610041
Structural deformation and origin of the arcuate fold-thrust belt in western Hubei Province
Wang Ping1, Liu Shaofeng2, Wang Kai3, Gao Tangjun4
1. Earth Science and Engineering, Nanjing University, Nanjing 210093;
2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083;
3. Xi'an Institute of Geology and Mineral Resources, Xi'an 710054;
4. SINOPEC Exploration Southern Company, Chengdu 610041
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摘要 对川东—湘鄂西断褶带内鄂西地区的弧形构造,从构造剖面特征、叠加褶皱样式和断裂性质入手进行几何学和运动学分析。结果发现鄂西弧形构造具有多期变形特征:早期普遍为北东东向的直线型褶皱,随着弧形带扩展,在东、西两翼分别发育右行和左行的逆冲—走滑断裂,同时分别形成北北东向和北西西向的弧形褶皱。晚期弧形带中部发育北北东向构造并叠加改造了早期北东东和北西西向褶皱,同时在黄陵背斜以西还发育交切早期构造的北北西向仙女山右行走滑断裂。根据弧形带扩展的几何学—运动学分类原则,并结合前人的古地磁研究结果,推测鄂西弧形构造应属于构造弯曲形成的弯曲弧。区域滑脱层和黄陵隆起阻挡可能是控制弧形样式的主要原因。区域滑脱层控制了拆离滑脱褶皱的构造样式; 黄陵基底隆起的阻挡作用使弧形带东翼进一步弯曲变形,并导致了构造应力场方向发生改变,造成了晚期北北东向与早期北东东向构造的叠加。由此恢复的鄂西弧形构造变形过程对于揭示川东—湘鄂西断褶带构造演化具有重要的指示意义。
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关键词弧形构造   弯曲弧   叠加褶皱   川东—湘鄂西断褶带   黄陵隆起     
Abstract: In northern Yangtze area,there are two Mesozoic arcuate fold-thrust belts,the southern Daba fold-thrust belt and the eastern Sichuan-Western Hubei fold-thrust belt.The origin of the southern Daba was due to the large arc-shape indentor(northern Daba divided by Chengkou-Fangxian thrust fault)and two basement uplift(Micangshan and Shennongjia),but the origin of the eastern Sichuan-Western Hubei fold-thrust belt was not well understood.Based on the cross sections and field mapping,this paper analyzed the geometry and kinematics of the folds and faults in western Hubei province.We found that the fold-thrust belt was characterized by multi-phase deformation.The early phase deformation was dominant by straight fold trending NEE.During the propagation of fold-thrust belt,the eastern and western limbs were developed with curved folds trending NNE and NWW,respectively.The strike-slip faults with opposite slip direction were also formed in the two limbs.The late phase deformation was concentrated in the central fold-thrust belt,characterized by NNE-trending fold and NNW-trending strike-slip fault.The NNE-trending folds superposed on the NEE-trending folds,while the NNW-trending fault cut across the NWW curved in the eastern limb.The two-phase deformation suggested the varied structural stress field controlled by different factors.We conclude that the arcuate fold-thrust belt is orocline with vertical-axis rotation in western Hubei Province.The early phase deformation was controlled by detachment horizons.The late phase deformation was controlled by Huangling basement uplift,which held the propagation of eastern limb of the fold-thrust belt and intensified the curved deformation.
Key wordsArcuate fold-thrust belt   Orocline   Superposed fold   Eastern Sichuan-Western Hubei fold-thrust belt   Huangling uplift   
收稿日期: 2011-03-08;
基金资助:

国家自然科学基金重点项目(编号: 41030318)资助

作者简介: 王 平,男, 1981 年9月生,博士后,构造地貌学专业。E-mail: tigerwp@gmail.com
引用本文:   
. 2012, 鄂西弧形构造变形特征及成因机制. 地质科学, 47(1): 22-36.
. Structural deformation and origin of the arcuate fold-thrust belt in western Hubei Province[J]. Chinese Journal of Geology, 2012, 47(1): 22-36.
 
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[2] 杜文博,张进江,肖毓祥,张波,李晓军,侯秀林,王盟,李景,程光瑾. 祁连山北缘深部弧形褶皱—逆冲带及其油气勘探前景[J]. 地质科学, 2016, 51(4): 1059-1073.
[3] 胡召齐 朱光 张必龙 陈印 魏鑫 张力. 上扬子北部褶皱带的构造应力场演化规律[J]. 地质科学, 2010, 45(02): 361-379.
[4] 曲国胜, Joseph Canerot, 王宗起, 赵民. 造山带弧形构造——西昆仑—帕米尔弧及其预测[J]. 地质科学, 1996, (4): 313-326.
[5] 沈镭, 池三川, 王思源, 杨海明. 广西芒场锡-多金属矿田叠加褶皱构造及趋势面分析研究[J]. 地质科学, 1992, (1): 44-49.
 
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