| 准噶尔盆地南缘褶皱-逆冲断层带分析 |
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| 引用本文： | 汪新伟,汪新文,刘剑平,马永生.准噶尔盆地南缘褶皱-逆冲断层带分析[J].地学前缘,2005,12(4):411-421. |
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| 作者姓名： | 汪新伟 汪新文 刘剑平 马永生 |
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| 作者单位： | [1]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 [2]中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083 [3]中国石油化工股份有限公司南方勘探开发分公司,云南昆明650021 |
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| 基金项目： | 中国石油化工总公司资助项目 |
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| 摘 要： | 讨论了与准噶尔盆地南缘褶皱-逆冲断层带有关的4个问题。(1)准噶尔盆地南缘褶皱-逆冲断层带具有纵向分带、横向分段和垂向构造分层的特征:纵向上由南至北可分为逆冲推覆构造带、基底卷入褶皱-冲断带和滑脱型褶皱-冲断带三个带;横向上,基底卷入褶皱-冲断带从西至东按横向调节带分为5个段,构造特征表现为反冲断层从不发育到向南反冲的位移逐渐增大、反冲断层所滑脱的层位亦逐渐加深;滑脱型褶皱-冲断带以红车断裂为界划分为西段和东段,西段构造运动弱,构造变形具双层结构;东段构造运动较强,发育大型冲向后陆的反向逆冲断层,构造变形多具有3层结构。(2)逆冲断层-褶皱类型按其形成机制分为基底卷入型冲断-褶皱、滑脱型冲断-褶皱以及基底卷入-滑脱混合型冲断-褶皱3大类,其中,基底卷入型冲断-褶皱的特征是褶皱作用发生在逆冲断裂之前,而滑脱型冲断-褶皱以冲断和褶皱同时或冲断层先于褶皱形成为特征。(3)本区存在横向和纵向传递带。横向调节带一般分布于基底卷入型褶皱-冲断带,主要为左旋走滑断层;纵向传递带分布于滑脱型褶皱-冲断带,以逆冲断层系斜列分布和位移纵向斜列传递为特征。(4)褶皱-冲断带形成的主控因素主要有:近南北向的水平挤压作用,上新世末—早更新世末和晚侏罗世末发生的构造变形以及古近系、下白垩统和下—中侏罗统发育的三套异常高压泥岩层相关的滑脱作用。
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| 关 键 词： | 褶皱-冲断带的构造特征 冲断-褶皱的类型 调节带 主控因素 准噶尔盆地南缘 |
| 文章编号： | 1005-2321（2005）04-0411-11 |
| 收稿时间： | 2005-04-15 |
| 修稿时间： | 2005-06-21 |
Analysis of the fold-thrust zone in the southern Junggar Basin, northwestern China |
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| WANG Xin-wei, WANG Xin-wen, LIU Jian-ping, MA Yong-sheng.Analysis of the fold-thrust zone in the southern Junggar Basin, northwestern China[J].Earth Science Frontiers,2005,12(4):411-421. |
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| Authors: | WANG Xin-wei WANG Xin-wen LIU Jian-ping MA Yong-sheng |
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| Institution: | 1. State Key l.aboratory of Geological Processes and Mineral Resources ,China University of Geosciences . Beijing 1 00083,China; 2. Key Laboratory of Lithosphere Tectonics and Litkoprobing Technology of Ministry of Education. China University of Geosciences. Beijiag 100083, China; 3. Southern Exploration and Production Sub-Company of SINOPEC, Kunming 650021, China |
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| Abstract: | Four topics related to the fold-thrust zone in the southern Junggar basin are discussed in this paper. (1) Based on structural characteristic, the fold-thrust zone in the southern Junggar basin is divided into several parts longitudinally, latitudinally and sectionally.Firstly, along the longitudinal direction (or from south to north), the fold-thrust zone is classified into three belts, i.e. the overthrust belt, the basement-involved belt and the décollement belt. Secondly, along the latitudinal direction (or from west to east), the basement-involved fold-thrust belt can be divided into five sections, such that backthrust'displacements increase and thrust detach surfaces deepen gradually from west to east. The decollement belt is separated into western and eastern sections by the Hongche fault, and has the structural characteristics that the eastern section had greater deformation and produced large backthrusts with fault planes oriented towards the hinterland. Finally, in cross- sectional profile, the western portion of the décollement belt preserves double-deck structures, whereas the eastern holds three-deck structures. (2) In terms of fold-forming mechanisms, the thrust-folds in the studied area are classified into three categories-the basement-involved, the décollement and the combination thrust-fold. Among these three categories, basement-involved thrust-folds have the main characteristics that folding occurred prior to thrusting and the décollement thrust-folds have the common feature that folding accompanied thrusting. (3) Transverse and strike-parallel accommodation zones are present in the studied area. The transverse accommodation zones generally formed within the basement-involved fold-thrust belt and its styles are mainly sinistral strike-slip faults. In contrast, the strike-parallel accommodation zones are developed mostly within the décollement fold-thrust belt and have the characteristics that the distribution and the displacement transportation of their thrusts both are relaying. (4) The controlling factors of the fold-thrust zone in the southern Junggar basin are compression with N-S direction,structural deformation occurred at the end of the Pliocene to the early Pleistocene and décollement related to clay with abnormal pressure during the Paleogene, the lower Cretaceous and the lower-Middle Jurassic. |
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| Keywords: | structural characteristic of the fold-thrust zone style of thrust-fold accommodation zone controlling factors the southern Junggar basin |
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