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首页> 外文会议>International symposium on Chinese petroleum exploration in 21st century >The crustal shortening and its timing of Kuqa rejuvenation foreland deformation belt and its implication on the coupling mechanism of the basin depression and mountains building in north flank of Tarim basin and south foothill of Tianshan Mountains, Chin
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The crustal shortening and its timing of Kuqa rejuvenation foreland deformation belt and its implication on the coupling mechanism of the basin depression and mountains building in north flank of Tarim basin and south foothill of Tianshan Mountains, Chin

机译：库车复兴前陆变形带的地壳缩短及其时机及其对塔里木盆地北侧和天山南麓盆地凹陷与山体形成耦合机制的启示。

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Kuqa rejuvenation foreland basin and its thrust wedge of foreland deformation belts are structurally responsed to the India-Eurasia collision in interior Asia continent. Based on the detailed surface geology reconnaissance and interpretations of a great deal seismic profiles, we conclude that thrust wedge of deformation belt in Kuqa rejuvenation foreland basin is divided into five structural units, including the marginal thrust and hidden structural zone, the Sdik anticline zone, the North linear Anticline zone, the Baichen basin, the Qulitage Anticline zone, and that the fault-related folds are the basic deformation styles of the rejuvenation foreland thrust wedge, which are classified into nine kinds of fault-related folds, including fault-bend fold, fault-propagation fold, detachment kink fold, duplex, pop up, hybrid fault-propagation/detachment fold, stacked anticline, composite wedge structure, superimposed fault-propagation/fault-bend fold and superimposed detachment/fault-bend fold. In the northern part of the thrust belt, the fault-related folds are mainly of fault-bend folds, fault-propagation folds, and duplexes. For the very front of the thrust belt there exist well developed blind thrusts and detachment kink folds, forming a typically cryptic thrust wedge front edge. Growth strata recorded accurately initial emplacement ages of every structure zone and detailed structural forming processes. Thrusts and thrust-related folds propagate from the north to the south within the thrust belt, e. i. Jiesdlik anticline initiated in Miocene (23.3 Ma), slip rate of blind thrust 0.15 mm/a; Kalabahe anticline and Klasu anticline initiated in 16.9 Ma, slip rate of hidden thrust 0.14 mm/a and 0.29 mm/a; Dawanqi anticline in 3.6 Ma, Dongqiu anticline happened in 3.2Ma, slip rate of hidden thrust 1.3 mm/a and 1.88 mm/a; The crustal shortening slip rate which caused the thrusting is slow at about 0.19 mm/a in average in Miocene, and during Pliocene and Quaternary it gets faster in about one magnitude order, up to 1.88 mm/a in average, implicating that an accelerating crustal shortening process occurred in late Cenozoic in the Kuqa thrust belt and approached a climax in Pliocene and Pleistocene. In light of the Kuqa rejuvenation thrust belt taper with the southward leading edge and its timing, a model that Tarim continent crust subducted northward beneath the Tianshan Mountains as a A-type subduction has been suggested to interpret the formation of the Kuqa rejuvenation foreland thrust belt during late Cenozoic era resulted from the delayed remote tectonic effect of the collision of India with Tibet. The crust shortening magnitude and shortening strain are also measured in the interpretation cross sections of seismic profiles. The average shortening magnitude and shortening strain and strain ratio are estimated as 45 km, and 40%～42% and 5.2x10~(-16)～5.6x10~(16) respectively. That is not fixed the respect shortening of Tianshan by the previous paleomagnitic work and more shortening by the basin-mountain boundary thrust and thrusts within the Tianshan Mountains is needed to make the kinematic balancing.
机译：库车复兴前陆盆地及其前陆变形带的逆冲楔在结构上响应于亚洲内部大陆的印度-欧亚大陆碰撞。根据详细的地面地质勘查和对大量地震剖面的解释，我们得出结论，库车复兴前陆盆地的变形带逆冲楔分为五个结构单元，包括边缘逆冲和隐伏构造带，Sdik背斜带，北部线性背斜带，白臣盆地，库利塔奇背斜带以及断裂相关褶皱是复兴前陆逆冲楔块的基本变形方式，分为断裂弯曲在内的9种断裂相关褶皱。褶皱，断层传播褶皱，分离扭结褶皱，双工，弹起，混合断层传播/分离褶皱，堆积背斜，复合楔构造，叠加的断层传播/断裂弯曲褶皱和叠加的分离/断裂弯曲褶皱在逆冲带的北部，与断层有关的褶皱主要是断层弯曲褶皱，断层传播褶皱和双相褶皱。对于推力带的最前部，存在发育良好的盲推力和分离扭结褶皱，形成了典型的隐秘推力楔形前缘。生长地层准确记录了每个结构区的初始初始年龄和详细的结构形成过程。逆冲和与逆冲有关的褶皱在逆冲带内从北向南传播。一世。中新世（23.3 Ma）开始结实斜背斜，盲推推力滑移速率0.15 mm / a; Kalabahe背斜和Klasu背斜始于16.9 Ma，隐伏推力滑移速率分别为0.14 mm / a和0.29 mm / a；大万起背斜3.6Ma，东丘背斜3.2Ma，隐性推力滑移速率分别为1.3mm / a和1.88mm / a。在中新世造成地壳推力的地壳缩短滑移率缓慢，平均约为0.19 mm / a，而在上新世和第四纪期间，地壳滑移速率以大约一个数量级加快，平均达到1.88 mm / a，这意味着地壳正在加速缩短过程发生在库车逆冲带的新生代晚期，并在上新世和更新世达到高潮。根据库车回春冲断带锥度与南缘前缘及其时间的关系，提出了以塔里木大陆壳向天山北下俯冲为A型俯冲的模型来解释库车回春冲断带的形成。新生代晚期的印度洋与西藏碰撞的延迟远距离构造效应造成了这一时期。地壳的缩短幅度和缩短应变也在地震剖面的解释截面中测量。平均缩短幅度，缩短应变和应变比估计为45 km，分别为40％〜42％和5.2x10〜（-16）〜5.6x10〜（16）。但这还不能解决以前的古镁铁工作缩短天山方面的问题，还需要通过盆山边界逆冲和天山内的逆冲来进一步缩短天山的运动平衡。

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