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Jiang S.,Ocean University of China | Jiang S.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li S.,Ocean University of China | Li S.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 5 more authors.
Journal of Asian Earth Sciences | Year: 2015

The tectonic evolution and sedimentary characteristics of the Carboniferous-Permian rocks of the Turpan-Hami Basin have been analysed. Initially, a joint inversion of gravity, magnetic, seismic data and the established model of electrical profiles was synthesized to create a new geological interpretation. Discussion on the tectonic characteristics of piedmont zone in the northern part of the basin then followed. According to the analysis of balanced cross-sections, the tectonic evolutionary history of Carboniferous-Permian sedimentary rocks of the Turpan-Hami Basin can be divided into three stages: an extensional stage in the Carboniferous, a tectonic transition stage in the Early Permian, and a compression and inversion stage after the Middle Permian. It is found that the tectonic evolution controlled the sedimentary facies under these three stages and the sedimentation evolution has undergone marine facies, marine-lacustrine transitional facies and lacustrine facies. Meanwhile, based on the recent seismic, gravity, magnetic and electrical data, and combined with the field surveying of outcrops, the residual distribution of Carboniferous-Permian strata is characterized by the widely distributed residual Upper Carboniferous, except for the southern Liaodun Uplift and locally in the eastern area, and the denudation of Middle Permian strata mainly distributed in the Turpan Depression and the Turpan-Hami Depression. After comprehensive analysis of the sedimentary facies and erosion of Permian strata, it is concluded that the tectonic evolution and sedimentation of the Turfan-Hami Basin can be used as a constraint on Permian subduction-related accretionary orogenesis of northern Xinjiang, NW China and the closure time of the Paleo-Asian Ocean. © 2015 Elsevier Ltd. Source


Zhao S.,Ocean University of China | Zhao S.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li S.,Ocean University of China | Li S.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 15 more authors.
Journal of Asian Earth Sciences | Year: 2014

Detailed subsurface structure of the eastern Junggar Basin is investigated using a large number of high-resolution two-dimensional reflection seismic profiles and well data. Our results reveal thrust faults, some of which are with strike-slip component, and fault-related folds dominating the subsurface structure of the study area. The thrust faults mainly show a divergent pattern towards the west and convergence towards the east. We divide these thrust faults and folds into three structural systems. The north thrust system, located in the north of the study area, is characterized by top-to-the southwest imbricate thrusts initiated from late Paleozoic. The central transpression system, dominating the central study area, mainly consists of thrust faults with visible strike-slip component, active from early Mesozoic until Cretaceous. The South thrust system includes top-to-the southeast thrusts in the southern part of the study area. The existence of these structural systems indicates that the eastern Junggar Basin underwent obvious intracontinental deformation in Mesozoic, probably due to the continuous convergence between the Altay and the Tianshan orogens after the main collision-accretion processes of the Central Asian Orogenic Belt. © 2014 Elsevier Ltd. Source


Sun W.,Ocean University of China | Sun W.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li S.,Ocean University of China | Li S.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 15 more authors.
Tectonophysics | Year: 2015

The Qinling-Qilian orogen preserves the records of Early Paleozoic convergence among the Proto-Tethyan micro-blocks. In this study, we analyze the seismic velocity structure and the aeromagnetic anomalies in the Qinling-Qilian orogen and its adjacent areas, showing that the northernmost boundaries of these Proto-Tethyan micro-blocks are defined by the Guyuan-Longshoushan Fault in the Qilian orogen and by the Luonan-Luanchuan Fault in the Qinling orogen, respectively. The lithosphere north of the Qinling-Qilian orogen subducted southward under the Qinling-Qilian orogen. The boundaries of the micro-blocks in the Qinling-Qilian orogen of the Proto-Tethys domain are mostly EW- or NE-trending. Combined with Early Paleozoic geological records, our results indicate that the south-dipping low-velocity anomaly under the Alxa block and the south-dipping high-velocity ones under the North Qilian orogen and the North China block might indicate that the Alxa block, the North Qilian Oceanic slab and the North China block subducted southward. The south-dipping high-velocity anomaly under the North Qilian orogen is interpreted as the remnant of the Proto-Tethys Ocean in that area. However, the north-dipping low-velocity anomaly under the South Qinling and the North Qinling orogens, the Qaidam block and the north-dipping high-velocity one under the Yangtze and the Bikou blocks suggest that the South Qinling and the North Qinling orogens, the Qaidam, the Yangtze and the Bikou blocks subducted northward. The present spatial framework of the Qinling-Qilian orogen is related to Early Paleozoic convergence among the Proto-Tethyan micro-blocks. © 2015 Elsevier B.V. Source


Xue Y.,Ocean University of China | Xue Y.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | Cao X.,Ocean University of China | Cao X.,The Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 18 more authors.
Scientia Geologica Sinica | Year: 2015

The Zhangjiakou-Penglai fault zone is a NWW-trending active fault zone. ETM+ optical images and SRTM images are selected as the primary source data, based on the known geological data of the study area, this paper found that the fault zone is characterized by obvious liner features. Judged from topographical features such as water distribution and offset, the faults have characteristics of left step patterns and sinistral strike-slipping movement. Based on remote sensing images along the fault zone, it can be divided into three segments called the Zhangjiakou segment, the Yanqing-Huailai segment and the Beijing-Tianjin segment, which are the same as the segments of the fault zone. The research results show that the Zhangjiakou- Penglai fault zone is a sinistral strike-slipping fault, having controlled some en-echelon left- stepped Quaternary pull-apart basins and alluvial fans and offset the NNE(NE) -striking faults. Each segment of the fault zone controlled the different scale river system distribution and morphology. The Beijing-Tianjin segment has certain control to Quaternary alluvial fans and coastal areas of cheniers. Combining the results of remote sensing interpretation with deep- seated geophysical data and field geological investigation data shows that remote sensing technique for probing spatial distribution and activity of faults has a broad application. ©, 2015, Science Press. All right reserved. Source

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