Key Laboratory of Submarine Geosciences and Prospecting Techniques

Qingdao, China

Key Laboratory of Submarine Geosciences and Prospecting Techniques

Qingdao, China
SEARCH FILTERS
Time filter
Source Type

Li P.,University of Hong Kong | Sun M.,University of Hong Kong | Rosenbaum G.,University of Queensland | Jourdan F.,Curtin University Australia | And 3 more authors.
Bulletin of the Geological Society of America | Year: 2017

The largest accretionary orogen in the world, the Central Asian orogenic belt, has evolved through the assembly of various oceanic and continental blocks. Understanding the processes associated with the development of this orogenic belt relies on precise recognition of the boundaries between various terranes. One such major suture zone, which records the collisional history of the Siberian marginal arc system (Chinese Altai) with intra-oceanic arc systems (East/West Junggar), is the Irtysh shear zone in NW China. The spatial continuity and the tectonic nature of this shear zone are still poorly understood, but its development has supposedly made a significant impact on the architecture of the western Central Asian orogenic belt and the formation of the Kazakhstan orocline. Here, we provide new insight into the evolution of this shear zone based on detrital zircon ages, Hf isotope composition, structural data and 40Ar/39Ar age constraints on the timing of deformation. Our results show a major discrepancy in detrital zircon populations and Hf model ages across the southern Chinese Altai and the northern East/West Junggar, thus allowing us to map the exact location of the tectonic boundary. Detrital zircon data constrain the initial closure of the Ob-Zaisan Ocean to the late Carboniferous (<323 Ma), and new structural and 40Ar/39Ar geochronological data shed light on the subsequent collisional processes. We propose that the collisional zone between the Chinese Altai and the East/West Junggar was initially subjected to crustal thickening at ca. 323-295 Ma, followed by orogen-parallel extension (ca. 295 Ma) and transpressional deformation (ca. 286-253 Ma). The closure of the Ob-Zaisan Ocean in NW China postdates the initial phase of oroclinal bending in the western Central Asian orogenic belt, thus indicating that oroclinal bending initiated during subduction. Based on our new constraints and other available geological data, we suggest that the early stage of oroclinal bending was likely driven by slab rollback. © 2016 Geological Society of America.


Zhang G.,China National Offshore Oil Corporation | Li S.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li S.,CAS Qingdao Institute of Oceanology | And 3 more authors.
Geological Journal | Year: 2016

Based on detailed analysis of the inversion tectonics in each of the secondary tectonic units of the East China Sea Shelf Basin (ECSSB), this paper suggests that the Cenozoic positive inversion tectonics in the basin are typically anticlines of various shapes associated with thrusts. Four stages of tectonic inversions are recognized in the basin related to the Oujiang Movement (T80), the Yuquan Movement (T30), the Huagang Movement (T20) and the Longjing Movement (T12), and these four inversion stages are temporally and spatially distinct. Temporally, the tectonic inversion in the West Depression Group tended to weaken, relatively, from the Oujiang Movement (T80) to the Huagang Movement (T20), while the Longjing Movement (T12) does not show an obvious inversion signature. Spatially, the Longjing Movement tectonic inversion in the Xihu and Diaobei sags of the East Depression Group shows a pronounced reduction in intensity from north to south. The tectonic inversion in the East Depression Group tended to intensify, relatively, from the Yuquan Movement (T30), through the Huagang Movement (T20) to the Longjing Movement (T12). The intensity distribution, migration and evolution of Cenozoic inversions in the ECSSB are local responses to the synthetic effect of the convergence and subduction rates, and direction changes between the Pacific and Eurasian plates and/or between the Indian and Eurasian plates. In particular, the eastward migration of positive inversion tectonics in the ECSSB is closely and successively related to the formation of the East Depression Group and the opening of the Okinawa Trough. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.


Li D.-Y.,Ocean University of China | Li D.-Y.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Zhang J.-L.,Beijing Normal University | Jiang X.-D.,Ocean University of China | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2013

Determination of the effects of diagenesis on Dainan sandstone reservoir in Zhenwu-Caozhuang region can facilitate the prediction of the beneficial oil reservoir. Based on core observation, the diagenetic characteristics of Dainan reservoir has been studied in detail by using case thin section, SEM, mercury penetration, X-ray and buried-thermal history modeling. Dainan sandstone has experienced such processes as the compaction, cementation, dissolution and metasomatism. Authigenetic cement includes clay mineral, ferrum carbonate, quartz, feldspar and anhydrite. Feldspar and fragment have mainly suffered dissolution. Dainan Formation is in the period A of mesodiagenesis. Dainan reservoir quality is mainly controlled by compaction, kaolinite cementation, ferrum carbonate cementation, overgrowth quartz and dissolution. Sandstone reservoirs in which dissolution or kaolinite infill diagenentic lithofacies develop commonly have higher porosity and permeability, while reservoirs developing compact-filling or carbonate cementation diagenentic lithofacies usually have poor physical property.


Gong W.,Ocean University of China | Gong W.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Jiang X.,Ocean University of China | Jiang X.,Key Laboratory of Submarine Geosciences and Prospecting Techniques
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2017

In spite of much research focused on thermal evolution history-tectonic activity of the Ailao Shan-Red River fault zone (ASRR) during Late Oligocene-Early Miocene, its thermal reconstruction is limited. Moreover, the related thermal disturbance factors are often ignored and the measured ages (cooling ages) are generally irrationally recognized as the timing of tectonic events in the existing studies. Combined with the pressure-temperature-depth paths (P-T-D) and paleogeomorphology reconstruction, the T-t paths of the ASRR are constructed to explore the genesis of T-t paths and the evolutionary characteristics of the fault zone systematically. The cooling process of the metamorphic massif can be divided into two phases: for Day Nui Con Voi is 32-30 Ma and 26-24 Ma, while for the Ailao Shan is 32-22 Ma and 22-20 Ma. In the first phase, the rapid cooling may have been caused by the strata denudation or tectonic denudation, followed by the more rapid cooling of the second phase, in which the intensity weakening of the fault has been more dominant, compared with the denudation and other factors. With the clockwise rotation and extrusion of the Indochina terrane relative to the South China block, the sinistral tensile transformation zone in the south propagated northwards. Additionally, the spatial differences in the tectonic activities induced the varied cooling processes for the southeastern and northwestern part. In phase I, the tectonic uplift in the southeastern part presented earlier and stronger than the northwestern one, with the northwestward propagation and weakening of the sinistral tensile transformation. So the cooling process of the southeastern part was much earlier and more rapid, compared with the northwestern process. In phase II, the activity of the ASRR which acted as the boundary of the plate extrusion became weak northwards, along with a new period of Tibet uplift in early Miocene. Then the change stimulated another rapid cooling process, showing the northwestward decreasing trend. © 2017, Editorial Department of Earth Science. All right reserved.


Li S.,Ocean University of China | Li S.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Kusky T.M.,China Three Gorges University | Zhao G.,University of Hong Kong | And 8 more authors.
Tectonophysics | Year: 2011

Along the Qinling-Dabie-Sulu orogenic belt in China crops out the world's largest terrane composed of ultrahigh-pressure (UHP) metamorphic rocks. Differences in the timing and mechanisms of oceanic and continental subductions are assumed to be responsible for different ages of high-pressure (HP) and UHP slices in different parts of the belt. The western part of the Dabie orogen (western Dabie terrane) holds a key to understanding of the transition from oceanic to continental subduction. This paper reports geochronological results to test a two-stage tectonic model for the exhumation of HP/UHP rocks in western Dabie. This model involves two different stages and types of extrusion for exhumation of the HP/UHP rocks in east-central China. Mica Ar/Ar ages, ranging from 241 to 231. Ma, indicate a general middle Triassic cooling probably driven by early upward extrusion during the collision between the North and South China Blocks. Late Triassic-Early Jurassic cooling was associated with later eastward extrusion, ranging from 200 to 184. Ma. The second event is recorded also in mica in the region that was not affected by later deformation and magmatism. The lateral movement along lithosphere-scale faults resulted in the eastward extrusion of the HP-UHP metamorphic terrane, which was followed, in the Late Triassic-Early Jurassic time, by a major compressive event. These two extrusion events are correlative with the two stages of Triassic exhumation of the western Dabie HP-UHP rocks, respectively. Wintin the framework of the Qinling-Dabie-Sulu orogenic belt, it is suggested for western Dabie that the subduction/exhumation of blueschist-facies unit is related to the Mianlue suture, whereas the subduction/exhumation of HP/UHP eclogite-facies units is related to the Shangdan suture. © 2011 Elsevier B.V.


Lai S.,Northwest University, China | Qin J.,Northwest University, China | Li Y.,Shenyang Institute of Geology and Mineral Resources | Li S.,Ocean University of China | And 2 more authors.
Journal of Asian Earth Sciences | Year: 2012

The source characteristics of the widespread Permian high Ti/Y basalts in the Emeishan Large Igneous Province (LIP) constitute important themes to evaluate the possible connection with a mantle plume beneath the Yangtze Block in southwestern China. Here we investigate the geochemical and isotopic signature of basalts from the Guangxi and Guizhou regions in the eastern margin of the Emeishan LIP and report the occurrence of high Ti/Y basalts in Guangxi. The zircons separated from Guangxi basalts yield a U-Pb concordia age of 257Ma, which is consistent with the age of the plume-related eruption of the Emeishan LIP. Both the Guangxi and Guizhou basalts studied here display evolved Sr-Nd isotopic composition and DUPAL Pb isotopic composition, with ( 87Sr/ 86Sr)i=0.705231 to 0.706147, positive to slightly negative ε Nd(t) values of -0.13 to +0.68, and △7=5-11, △8=70-84. The Guangxi basalts possess low SiO 2 (44.82-49.71 wt.%), and TiO 2 (2.29-3.54 wt.%), but are enriched in LREE and LILE with (La/Sm) N values of 2.2-2.6, high Ce/Yb ratios (19.6-30.0) and slightly negative Nb and Ta anomalies. The Guizhou basalts display higher SiO 2 (47.49-50.27 wt.%), TiO 2 (3.93-4.92 wt.%), Zr, Nb and La contents. They also show higher Ce/Yb (30.2-37.8) and Sm/Yb (3.56-4.19) ratios as compared to those of the Guangxi basalts, and do not possess negative Nb and Ta anomalies. The distinct differences between the Guangxi and Guizhou basalts may be caused by different degrees of partial melting of the garnet peridotite in their source region. We propose that the Guizhou basalts were derived from partial melting of metasomatized veins in the Yangtze continental lithosphere which were heated by the upwelling Emeishan plume, and the Guangxi basalts represent higher degrees of partial melting of the sub-continental lithospheric mantle and undergone minor crustal contamination during their ascent. © 2011.


Yu Z.,Ocean University of China | Yu Z.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Zhai S.,Ocean University of China | Zhai S.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 5 more authors.
Geological Journal | Year: 2016

The Okinawa Trough, located between Japan and Taiwan, is a back-arc basin at an early stage of evolution from arc to back-arc. Relative to other western Pacific back-arc basins, it has a shallow Wadati–Benioff zone and thick continental crust. In this paper, helium and CO2 concentrations and helium isotope data are presented for three basalts and three pumices from the middle and southern parts of the Okinawa Trough, with the aim of assessing the impact of volatile recycling and crustal contamination on magma composition. In the southern trough, a basalt sample sourced from magma with a large subduction component has a helium isotope ratio similar to that of typical MORB and a high CO2/3He ratio. This result indicates that subduction is an important barrier for helium but not for carbon. The contribution of recycled helium to the underlying mantle wedge is negligible in the middle and southern parts of the trough. Crustal-helium contamination of the basaltic magma from the southern trough is weak but is significant for volcanic rocks from the middle trough that were sourced from magma with significant crustal residence times. Degassing has affected all samples, producing hydrothermal fluids rich in volatiles. Deep, violent degassing may have occurred in the mantle wedge in the southern trough, and pre-eruptive magma degassing during storage is particularly extensive in the middle trough. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.


Chu Z.,Ocean University of China | Chu Z.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li Y.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li B.,Polar Research Institute of China
Journal of Coastal Research | Year: 2015

The periodicity analysis and correlation analysis about river runoff and basinwide precipitation in a river are widely used. While there exists a problem in previous periodicity analysis and correlation analysis, which here refers to lacking consideration of human impacts on river runoff. This problem may obscure the results of periodicity analysis and correlation analysis. For the case of the Yangtze River and the Yellow River, we carried out periodicity analysis and correlation analysis about river runoff and basinwide precipitation. The primary analyses without consideration of human impacts show that there are clear periods and high correlation between annual runoff and annual precipitation of the Yangtze River in humid zone, while the periods and correlation are not clear in the Yellow River in arid and semiarid zones. The discussion indicates that water consumption within the Yellow River basin is often in the same order of magnitude as that of actual water discharge, which could affect the periodicity analysis and correlation analysis. Therefore, one argument is presented that human impacts (i.e. water diversions) on the river runoff should be considered in the process of periodicity analysis and correlation analysis of a river between arid and semi-arid climatic zones, where water consumption is often in the same order of magnitude as that of actual water discharge. © 2015 Coastal Education and Research Foundation, Inc.


Wang H.,Ocean University of China | Wang H.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Wang A.,Ocean University of China | Wang A.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | And 5 more authors.
Continental Shelf Research | Year: 2014

Distribution of suspended sediment in the Bohai Sea and its seasonal variability were investigated based on the datasets obtained from four cruises carried out in different seasons in 2010 and 2012. The results indicate that the spatial distribution of suspended sediment in the Bohai Sea was dominated by the river input and coastal resuspension that depends on the type of local surface sediment and hydrodynamics. The suspended sediment was mostly concentrated in the southern Bohai Sea particularly around the Yellow River Delta in the summer season as impacted by the river plume but confined within a very limited area near the river mouth, whereas in winter-spring seasons sediment concentration became much higher as a result of active coastal resuspension induced by energetic wave actions in the shallow water. High sediment concentration was found in Liaodong Bay in winter-spring seasons when dynamics become strong but decrease significantly in summer seasons. The sediment concentration in the southern Bohai Strait was much higher than that in the northern part, suggesting evident sediment export to the Yellow Sea particularly in the winter-spring seasons. Strong seasonal variability of suspended sediment distribution in the Bohai Sea was consistent with the monsoon activity and associated wave actions and coastal currents that are varying seasonally. The dominance of seasonal monsoon signal and associated wave dynamics make the subaqueous Yellow River delta to be a major sink for the terrestrial sediment in the summer seasons, but transiting to a primary source in winter-spring seasons for sediment redistribution in the Bohai Sea and sediment export to the Yellow Sea. The seasonal patterns of suspended sediment distribution in the Bohai Sea and the dominance of monsoon activities may provide a good reference to understanding the sediment transport in the China Shelf Seas where sediment resuspension and coastal circulation are evidently driven by monsoon. © 2014 Elsevier Ltd.


Ma Y.,Ocean University of China | Ma Y.,Key Laboratory of Submarine Geosciences and Prospecting Techniques | Li G.,Ocean University of China | Li G.,Key Laboratory of Submarine Geosciences and Prospecting Techniques
Acta Oceanologica Sinica | Year: 2010

The evolvement history of modern Huanghe River Delta tidal flat, coastline and underwater terrain were studied based on the analysis of remote sensing images and water depth data. Based on the analysis of seafloor terrain evolution on different historical stages, a formula simulating the erosion and deposition evolvement model of subaqueous Huanghe River Delta slope was proposed, and the evolvement trend of the subaqueous delta terrain was predicted. The result shows that the equilibrium transition zone is near the water depth of 12 m with seabed erosion in shallower water and accumulation in deeper water during the first 150 a after the river channel was deserted. In the meantime, the underwater slope became gentler and the coastal erosion rate became slow gradually. Then, the subaqueous delta slope changed to up concave from upper convex, and the shape of subaqueous delta disappeared. The coast type changed to silt-mud coast about 100-150 a after the river course was deserted. The erosion depth in the foot of the seawall is calculated based on the formula. © 2010 The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg.

Loading Key Laboratory of Submarine Geosciences and Prospecting Techniques collaborators
Loading Key Laboratory of Submarine Geosciences and Prospecting Techniques collaborators