Key Laboratory of Submarine Geosciences and Exploration Techniques

Qingdao, China

Key Laboratory of Submarine Geosciences and Exploration Techniques

Qingdao, China
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Liu X.,Ocean University of China | Liu X.,Tohoku University | Liu X.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Zhao D.,Tohoku University
Geophysical Journal International | Year: 2016

We present the first high-resolution Rayleigh-wave phase-velocity azimuthal anisotropy tomography of the Japan subduction zone at periods of 20-150 s, which is determined using a large number of high-quality amplitude and phase data of teleseismic fundamental-mode Rayleigh waves. The obtained 2-D anisotropic phase-velocity models are then inverted for a 3-D shear-wave velocity azimuthal anisotropy tomography down to a depth of ~300 km beneath Japan. The subducting Pacific slab is imaged as a dipping high-velocity zone with trench-parallel fast-velocity directions (FVDs) which may indicate the anisotropy arising from the normal faults produced at the outer-rise area near the Japan trench axis, overprinting the slab fossil fabric, whereas the mantle wedge generally exhibits lower velocities with trenchnormal FVDs which reflect subduction-driven corner flow and anisotropy. Depth variations of azimuthal anisotropy are revealed in the big mantle wedge beneath the Japan Sea, which may reflect past deformations in the Eurasian lithosphere related to backarc spreading during 21 to 15 Ma and complex current convection in the asthenosphere induced by active subductions of both the Pacific and Philippine Sea plates. © The Authors 2016.


Li S.Z.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.Z.,Ocean University of China | Suo Y.H.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Suo Y.H.,Ocean University of China | And 11 more authors.
Geological Journal | Year: 2013

Since the Mesozoic, the North China Craton has been located at a triangular junction surrounded by subduction or collision zones. This craton thus marks the frontier of a super-convergent regime. Within the super-convergence tectonic domains, however, distinct extensional regimes operated in the Meso-Cenozoic Bohai Bay Basin located at the eastern part of the North China Craton. In this synthesis, we focus on the intracontinental dynamics during the Mesozoic to Cenozoic in the North China Craton. Whereas the deep structures as revealed from tomographic studies show a remarkable difference between the Western and Eastern blocks of the North China Craton, the shallow setting in both regions is characterized by super-convergence. We propose here that the tectonic scenario of the Bohai Bay Basin developed during the destruction of the North China Craton is largely characterized by Mesozoic extrusion and Cenozoic NW-directed intracrustal extension with pull-apart. The Cenozoic deep process is mainly a regional far-field eastward upwelling of the asthenosphere beneath the western tectonic domain due to the India-Eurasia Plate collision accompanied by the eastward jump and rollback of the subducting Pacific Plate. The deep processes under the Bohai Bay Basin in the Mesozoic are local delamination and magma underplating. Our study highlights the contrasting structural and tectonic signature developed in the frontier of one of the largest super-convergent systems on the globe. © 2013 John Wiley and Sons, Ltd.


Guo L.,Ocean University of China | Guo L.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | And 10 more authors.
Journal of Asian Earth Sciences | Year: 2015

The Zhangjiakou-Penglai Fault Zone (ZPFZ), as a large-scale WNW-trending active fault zone with frequent seismic activity, is an area prone to moderate to intense earthquakes across North China. A detailed analysis of the ZPFZ has been carried out based on earthquake activity, deep structural response, dynamic mechanism and physical simulation by conducting an en échelon fault model experiment. The results show that the ZPFZ is a lithospheric active fault zone that has controlled some small en échelon Quaternary pull-apart basins and has triggered many earthquakes as seismogenic structures. The earthquake location and intensity distribution by the experimental simulation fit well with those of actual earthquakes. The earthquake distribution is controlled obviously by the en échelon structural properties. The intensity of seismic activity is strong in the middle and weak at the western and eastern ends of the fault zone, migrating from the southeast to the northwest along the entire fault zone. This WNW-trending fault zone in North China, is closely related to the surrounding plate activities. The ZPFZ is not only dominated by the collision of the Indian Plate to the Eurasian Plate, but is also influenced by the subduction of the Pacific Plate. It depends on the comprehensive reflection of two geodynamic settings from the western collision of the Indian to the Eurasian plates and the eastern subduction of the Pacific Ocean Plate to the Eurasian Plate. © 2015 Elsevier Ltd.


Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | Guo L.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Guo L.,Ocean University of China | And 15 more authors.
Journal of Asian Earth Sciences | Year: 2015

During the Mesozoic and Cenozoic, the Qinling Mountains formed a nearly E-W-striking uplifted mountain range separating the North China and South China blocks, while the Taihang Mountains formed a S-N-striking uplifted mountain range within the central North China Block. Thus, the strikes of both are perpendicular to each other. In order to investigate the exhumation, uplift history and transition of tectonic stress fields between these two mountain ranges within the Eurasian Plate, by systematic comparison and analysis of their regional compressive and extensional tectonics, and contrasting the transitions of tectonic regimes during the Mesozoic and Cenozoic interval, it is concluded that the transition period of the two tectonic regimes occurred around the late Early Cretaceous. Through analysis and comparison of coeval stress fields in different tectonic units, it is revealed that their shortening and compressive deformation is related to intraplate heterogeneity of lithospheric structures caused by the formation of ancient orogenic belts, and their subsequent extension is closely related to penetrative intraplate rifting in East China. Therefore, the extensional tectonics displays the formation of wide rift valleys, whose overall tectonic framework is inherited from its pre-existing basement tectonic framework. In summary, the difference between intraplate deformations is controlled by pre-existing basement tectonics, and the responses of complex pre-existing boundaries of different intraplate blocks to the geodynamics at plate margins. After removing the far-field effect of plate subduction and collision, the intraplate deformation mechanism itself may be closely associated with the heterogeneity of intraplate thermal-mechanical structures. © 2015 Elsevier Ltd.


Suo Y.,Ocean University of China | Suo Y.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | And 9 more authors.
Journal of Asian Earth Sciences | Year: 2014

Tectonic migration is a common geological process of basin formation and evolution. However, little is known about tectonic migration in the western Pacific margins. This paper focuses on the representative Cenozoic basins of East China and its surrounding seas in the western Pacific domain to discuss the phenomenon of tectonic jumping in Cenozoic basins, based on structural data from the Bohai Bay Basin, the South Yellow Sea Basin, the East China Sea Shelf Basin, and the South China Sea Continental Shelf Basin. The western Pacific active continental margin is the eastern margin of a global convergent system involving the Eurasian Plate, the Pacific Plate, and the Indian Plate. Under the combined effects of the India-Eurasia collision and retrogressive or roll-back subduction of the Pacific Plate, the western Pacific active continental margin had a wide basin-arc-trench system which migrated or 'jumped' eastward and further oceanward. This migration and jumping is characterized by progressive eastward younging of faulting, sedimentation, and subsidence within the basins. Owing to the tectonic migration, the geological conditions associated with hydrocarbon and gashydrate accumulation in the Cenozoic basins of East China and its adjacent seas also become progressively younger from west to east, showing eastward younging in the generation time of reservoirs, seals, traps, accumulations and preservation of hydrocarbon and gashydrate. Such a spatio-temporal distribution of Cenozoic hydrocarbon and gashydrate is significant for the oil, gas and gashydrate exploration in the East Asian Continental Margin. Finally, this study discusses the mechanism of Cenozoic intrabasinal and interbasinal tectonic migration in terms of interplate, intraplate and underplating processes. The migration or jumping regimes of three separate or interrelated events: (1) tectonism-magmatism, (2) basin formation, and (3) hydrocarbon-gashydrate accumulation are the combined effects of the Late Mesozoic extrusion tectonics, the Cenozoic NW-directed crustal extension, and the regional far-field eastward flow of the western asthenosphere due to the India-Eurasia plate collision, accompanied by eastward jumping and roll-back of subduction zones of the Pacific Plate. © 2014 Elsevier Ltd.


Jin Y.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Jin Y.,Ocean University of China | Cao Z.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Cao Z.,Ocean University of China | And 5 more authors.
Nature Environment and Pollution Technology | Year: 2014

The Laotieshan Channel is one of the major channels in the north of the Bohai Strait, China. A tidal depositional system shaped by strong currents has developed in the eastern Bohai Sea, consisting of the Laotieshan Channel, the Liaodong Shoal and the Bozhong Shoal. Based on the grain-size characteristics, distribution of heavy minerals and numerical simulation results, the sediment distributions of different geomorphic units were analysed, and the trend of sediment transport is discussed. The results show that coarse-grained sediment is mainly distributed in the Laotieshan Channel, and the typical sediment type is muddy sandy gravel, whereas fine-grained sediment mainly covers the Liaodong Shoal and the Bozhong Shoal. Moreover, the sediments in sand ridges have a finer grain size than those in troughs. The sediment of the Bozhong Shoal mainly consists of muddy sand. The sediments of ridges, in contrast, are sand and silty sand; those of troughs are sandy silt and silty sand. The distribution of typical heavy minerals is similar to that of total heavy minerals and areas with relatively high content occur in the sand ridge area and the sand sheet area. The Laotieshan Channel is eroded and the sediment is transported to the Liaodong Shoal and the Bozhong Shoal. The sediment continues to be transported northwest in the Bozhong Shoal, while in the Liaodong Shoal it is transported approximately along the long axes of sand ridges. The sediment transport trends in the tidal depositional system are adapted to the hydrodynamic environment, and the tidal geomorphological system of the Liaodong Shoal will remain stable at the century scale.


Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | Santosh M.,Kochi University | Zhao G.,University of Hong Kong | And 3 more authors.
Journal of Asian Earth Sciences | Year: 2012

Since Mesozoic, the South China region has been located at the center of a triangular area surrounded by westward subduction of the Pacific plate, northward subduction of the India Plate beneath the Eurasia Plate, and collision of the North and South China blocks along the Central China Orogen. This region thus marks the frontier of a super-convergent regime. Within the super-convergence domain, the compressional structures in the center of the South China Block are mainly characterized by shortening, thrusting and decollement. The block underwent inhomogeneous rejuvenation of the pre-existing crust and lithospheric structures through reactivation of late-stage activities. The surface deformation of the Xuefeng Intracontinental Tectonic System within the South China Block is possibly derived from intraplate tectonics. Particularly, the distinct magmatism between the west and east limbs of the Xuefeng Precambrian Uplift is a possible response of the rheological structure of the lithosphere. The deep structures as revealed from tomographic studies show marked difference of lithosphere architecture between the eastern and western sub-blocks of the South China Block. These data illustrate the long-term mosaic of multi-block convergence which led to present-day inhomogeneity in the continental lithosphere in South China. A comparison of the intensive contraction of the South China Block with the distinct features of rifting of the North China Block, brings out the contrasting structural and tectonic signatures developed in the same frontier of one of the largest super-convergent systems on the globe during the Mesozoic to Cenozoic. © 2011.


Jiang S.-H.,Ocean University of China | Song C.-H.,Ocean University of China | Li S.-Z.,Ocean University of China | Li S.-Z.,Key Laboratory of Submarine Geosciences and Exploration Techniques | And 2 more authors.
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2013

Based on the interpretation of seismic profiles and analysis of fault pattern, three different geological models named single-force thrusting, double-force slipping and basement uplifting were proposed by analyzing the relationship between denudation and sedimentation at the two sides of the fault in Hami depression. Three test fault activity formulas for those different models were given to calculate vertical displacements of the major faults during the Indosinian, the Yanshanian and the Himalayan periods. The results show that the thrusting in Huoshizhen sag is intensive during the Indosinian period, but became weaker and weaker during the Yanshanian period, the activity of fault enhanced only in the south boundary during the Himalayan period. While the thrusting in Sanbao sag initiated during the Indosinian period, and became more intensive during the Yanshanian period, then terminated during the Himalayan period. Differentiation of the fault activity in different sags directly control the formation and evolution of the structural patterns in these sags. The tectonic framework of Huoshizhen sag basically developed during the Indo-china movement, while that of Sanbao sag finally developed after the Yanshanian movement.


Ma Y.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Ma Y.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | And 9 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

Submarine landslides has been gradually attracted attentions because of exploration and exploitation of submarine gashydrate in the past decade. Submarine landslides in the Qiongdongnan basin, Northern South China Sea generally occur in continental slope where gashydrate usually accumulates. They play an important role to their development and exploration. We analyze the detailed geometric characteristics of submarine landslides in the Qiongdongnan basin based on the preexisting 2D seismic profiles to identify three major slide planes which are caused by three landslide events. Each landslide event can be divided into several secondary landslide stages. Typical landslide topography such as slide scarps, slide plane, slide terraces, slide valleys are widely developed in the study area. Based on preliminarily estimated, the Qiongdongnan submarine landslides cover an area of about 2500 km2. The submarine landslides are controlled by continental slope, active faults, sea-level drops, gravity of sediments, seabottom flows, gas hydrate dissociation and other factors. Combined with chronostratigraphic framework, the active period of the landslides in the Qiongdongnan basin can be identified between Late Pliocene and Quaternary.


Cao X.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Cao X.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Exploration Techniques | Li S.,Ocean University of China | And 14 more authors.
Earth Science Frontiers | Year: 2013

The North China Craton can be divided into the Western and Eastern Blocks separated by the Trans-North China Orogen. Since the Mesozoic, the North China Craton underwent thinning and destruction. The destruction center is located in the Eastern Block, whereas the Western Block and the north-trending Trans-North China Orogen remained their integrity, and the transition zone between them is the eastern Taihang Mountains. Two subparallel important faults developed in the Taihang Mountain region, called the Taihang Mountain Large Fault and the Eastern Taihang Mountain Fault respectively, as the major faults of the Eastern Taihang Mountain Fault Belt. Previous studies revealed that the Eastern Taihang Mountain Fault is inherited from Precambrian tectonic belts controlling the differences of Precambrian crystalline basements between the Eastern Block and the Taihang Mountain Region. Since the Palaeocene, the Eastern Taihang Mountain Fault developed into negative morphotectonic inversion as a normal fault in the western margin of the Bohai Bay Basin. However, the Taihang Mountain Large Fault existed in the Yanshanian as a major thrust, and played an important role in the uplift of the Taihang Mountains. During the middle Miocene, along with the formation of the Shanxi graben system, the Taihang Mountain Large Fault underwent a negative structural inversion and controlled the development of a series of intermontane grabens. Since the Cenozoic, the tectonic migration in this region as a whole jumped toward the west, developing under regional strike-slipping and extension a new intraplate mountain-basin relationship.

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