必须声明标量变量 "@Script_ID"。 塔里木盆地玛扎塔格弧形构造及斜向逆冲-《地球科学与环境学报》
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[1]杨庚.塔里木盆地玛扎塔格弧形构造及斜向逆冲[J].地球科学与环境学报,2018,40(04):381-397.
 YANG Geng.Mazatage Arcuate Structure in Map-view and Oblique Thrust in Tarim Basin, Western China[J].Journal of Earth Sciences and Environment,2018,40(04):381-397.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第40卷
期数:
2018年第04期
页码:
381-397
栏目:
基础地质与矿产地质
出版日期:
2018-07-15

文章信息/Info

Title:
Mazatage Arcuate Structure in Map-view and Oblique Thrust in Tarim Basin, Western China
文章编号:
1672-6561(2018)04-0381-17
作者:
杨庚
中国石油勘探开发研究院,北京 100083
Author(s):
YANG Geng
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
关键词:
弧形构造滑脱褶皱斜向逆冲剪切断层弯曲褶皱走滑断层部分复原玛扎塔格巴楚隆起
Keywords:
arcuate structure detachment fold oblique thrust shear fault bend folding strikeslip fault partially restoration Mazatage Bachu uplift
分类号:
P542
DOI:
-
文献标志码:
A
摘要:
塔里木盆地巴楚隆起南部边缘玛扎塔格山地表构造为一倾向南的新近纪单斜地层,而中深部则为凸向北玛扎塔格背斜弧形构造带。根据该区构造展布特征,依据地震和钻井资料,对玛扎塔格构造进行了详细分析研究。首先从平面上分析了该构造主挤压应力方向,然后建立起弧形构造不同部位构造接触关系,引进斜向逆冲断层褶皱概念,分析了所解释的地震剖面,并对其进行部分平衡恢复。结果表明:弧形构造主挤压应力方向垂直弧顶(中部),与弧形构造东、西两段斜交;弧形构造中部与东段之间发育撕裂断层——玛4井东走滑断层,弧形构造中部与西段之间的分界构造为玛7井西侧向断坡;无逆冲断层的部分恢复剖面显示弧形构造中部位移较为均衡,古生界地层从上到下缩短量基本一致,说明构造基本上为纯挤压作用形成的滑脱褶皱;弧形构造西段滑脱褶皱北翼的寒武系—奥陶系地层缩短量大于石炭系—二叠系地层缩短量,说明滑脱褶皱的北翼存在斜向剪切作用,其形成的构造可与混合剪切断层弯曲褶皱类比;而弧形构造东段的部分恢复剖面表明中上寒武统—中下奥陶统缩短量增加很快,而石炭系—二叠系缩短量逐渐减少,说明该构造存在斜向剪切作用,其形成的褶皱类似于简单剪切断层弯曲褶皱;玛扎塔格弧形构造属于旋转弧形构造类型,即早期平直构造被晚期挤压导致逐渐弯曲形成的弧形构造,这与剖面上观察到的生长地层得到变形时间认识完全一致。
Abstract:
The collision between India Plate and Asia Plate has a strong impact on the deformation of the orogenic belts and basins in the western China, especially much of the deformation is centered on the internal Tarim Basin with the rigid basement, which is mainly in and both sides of Bachu uplift. The north toward Mazatage arcuate structure in map-view, which is located in the southern deformation sides of Bachu uplift, is covered by Quaternary sedimentary terrestrial clastic rocks. The poor reflection of the seismic data in the both limbs nearby the core of Mazatage anticline has given many structural interpretations of Mazatage structural belt, because the wells, mainly located in the cores of Mazatage anticline, are relatively shallower and unrevealed deeper strata. The Mazatage actuate structural belt can be divided into three parts in map, including the northeastward west part, the east-westward middle part and the northwestward east part, which were respectively separated by Ma7-well lateral ramp and a transversal Ma4-well strike-slip fault. By wells and 2D seismic data, the reinterpreted seismic data show Mazatage anticline is a typical mid-Cambrian-gypsum-cored detachment folds both in the western part and central part of Mazatage arcuate structure with thrusting northward, in which two thrust faults are developed in both the core and in south limb of the anticline. According to the structural styles in detail, it is found that a mid-Cambrian-gypsum-cored Mazatage detachment anticline restored by removing thrust faults shows a shortening of Cambrian-Ordovician is greater than that of Carboniferous-Permian, and can be interpreted a simple shear fault-bend fold resulted by both Mazatage thrust and Gudongshan thrust fault with strike-slip shear faulting in the north limb of anticline in the west part of Mazatage arcuate structure. In the eastern part of Mazatage arcuate structures, an anticline is developed by North Mazatage thrust fault with strike-slip shear faulting in the south limb of anticline, and can be interpreted a simple shear fault-bend fold. The section restored by removing thrust faults illustrates that the shortening from Early-Middle Cambrian to Late Ordovician increases greatly, but decreases gradually from Carbonic to Late Permian. The detached Mazatage anticline restored by removing thrust faults shows that the shorting of Paleozoic strata from Permian to Cambrian is not changed in the central part without shearing in the north limb of anticline. The interpretation of seismic data shows that there is a sinistral component of transcurrent movement added to the north thrusting in the western part of Mazatage arcuate structures, and a dextral component of transcurrent movement added to the north thrusting in the eastern part.

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备注/Memo

备注/Memo:
收稿日期:2018-02-10;修回日期:2018-05-04
基金项目:国家科技重大专项项目(2016ZX05003-001);中国石油天然气股份有限公司科技部项目(2016B-0501)
作者简介:杨 庚(1965-),男,山西大同人,高级工程师,理学博士,E-mail:yanggeng@petrochina.com.cn。
更新日期/Last Update: 2018-07-27