Consulta: creatorFacets:"Zhao, Minghui"
Registros recuperados: 7
Data/hora: 04/06/2024 00:13:21

PostSeafloor Spreading Volcanism in the Central East South China Sea and its Formation Through an Extremely Thin Oceanic Crust
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Zhao, Minghui; He, Enyuan; Sibuet, Jean-claude; Sun, Longtao; Qiu, Xuelin; Tan, Pingchuan; Wang, Jian.
P-wave velocity models were obtained by forward and inverse modeling from 38 ocean bottom seismometers deployed in the central East sub-basin of the South China Sea (SCS). Four types of crust have been defined; a) thin oceanic crust (&lt;5 km), b) typical oceanic crust (5-6 km), c) thick oceanic crust hosting post-spreading volcanoes (&gt;6 km) with significant intrusive roots, and d) thick oceanic crust with enhanced spreading features (&gt;6 km) but without significant roots. Within the central East sub-basin, the thin oceanic crust, only identified inside a 80-km wide zone, is located within an overall 150-km wide domain characterized by N055° seafloor spreading trends. The post-spreading volcanoes were formed during a N-S tensional episode around 6-10...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00427/53882/54951.pdf

Intermingled fates of the South China Sea and Philippine Sea plate
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Zhao, Minghui; Sibuet, Jean-claude; Wu, Jonny.
Recent studies have shown the extent and nature of the South China Sea (SCS) at the end of spreading by unfolding (i.e. structurally restoring) the Manila slab, which is the subducted part of the SCS, and by identifying the nature of the crust-lithosphere (oceanic or thinned continental) from mid-slab P-wave velocity perturbations (dVp) [1,2]. The objective of this paper is to propose a reconstruction of the SCS at the end of seafloor spreading and to discuss its geodynamic consequences in the context of the SCS and Philippine Sea plate (PSP) evolution. Reasonably accurate PSP paleo-latitudes and poorly defined paleo-declinations were primarily used to establish the kinematic evolution of the PSP through time (e.g. [3,4]) until 2016, when Wu et al. [1]...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00611/72275/71069.pdf

Oceanic mantle reflections in deep seismic profiles offshore Sumatra are faults or fakes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sibuet, Jean-claude; He, Enyuan; Zhao, Minghui; Pang, Xinming; Klingelhoefer, Frauke.
In the late 90's, some faults identified within oceanic crust were demonstrated to be artifacts arising from out-of-plane scattering along linear sediment-buried fault scarps. Symmetrical mantle reflections observed southwest northern Sumatra on seismic reflection profiles have been identified as faults cutting through the upper mantle down to unprecedented depths reaching similar to 45 km. Seawater being conveyed along sub-vertical re-activated fracture zones (FZs) to the upper mantle, the mantle portions of FZs are serpentinized and act as mirrors for seismic rays. We suggest that the mantle features are not faults but artifacts resulting from out-of-plane reflections on these mirrors. Two perpendicular seismic profiles crossing the same FZ display two...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00516/62771/67173.pdf

3D seismic structure of the Zhenbei-Huangyan seamounts chain in the East Sub-basin of the South China Sea and its mechanism of formation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Wang, Jian; Zhao, Minghui; Qiu, Xuelin; Sibuet, Jean-claude; He, Enyuan; Zhang, Jiazheng; Tao, Chunhui.
The probable N055°-oriented extinct spreading ridge of the East Sub-basin is cut across by the post-spreading volcanic ridge oriented approximately E–W in its western part and called the Zhenbei–Huangyan seamounts chain. A three-dimensional ocean bottom seismometer survey was conducted in 2011 and covered both the extinct spreading ridge and the Zhenbei–Huangyan seamounts chain in the East Sub-basin. The comprehensive seismic record sections of 39 ocean bottom seismometers underline the high-quality data with clear and reliable P-wave seismic first arrivals. The three-dimensional tomographic results show that the crust is oceanic on each side of the Zhenbei–Huangyan seamounts chain. The seafloor spreading lineaments and associated fracture zones pattern...
Tipo: Text
Palavras-chave: Extinct spreading ridge; Zhenbei-Huangyan seamounts chain; 3D seismic structure; Post-spreading magmatism; East Sub-basin; South China Sea.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00314/42515/44989.pdf

Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Huang, Haibo; Qiu, Xuelin; Pichot, Thibaud; Klingelhoefer, Frauke; Zhao, Minghui; Wang, Ping; Hao, Tianyao.
Evolution of the continental margins of the South China Sea (SCS) is one of the open questions when discussing continental breakup and seafloor spreading. We processed data from a wide-angle seismic profile (OBS2011–1), which passes through the northwestern margin of the SCS, and performed travel time modeling to obtain the seismic velocity structures. The modeling results show a stepwise variation of the crustal thicknesses from continental margin to oceanic basin. Stretching factor of the upper crust is nearly double the estimate of the lower crust along the Zhongsha Trough. The lower crust shows asymmetrical upwelling towards the trough center, accompanied by ∼0.3 km/s of the velocity increase due to magmatic addition. The upper and lower crusts have...
Tipo: Text
Palavras-chave: Seismic tomography; Continental tectonics: extensional; Crustal structure; Rheology: crust and lithosphere.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61189/64720.pdf

Geophysical constraints on the lithospheric structure in the northeastern South China Sea and its implications for the South China Sea geodynamics
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Liu, Siqing; Zhao, Minghui; Sibuet, Jean-claude; Qiu, Xuelin; Wu, Jonny; Zhang, Jiazheng; Chen, Chuanxu; Xu, Ya; Sun, Longtao.
An E-W oriented OBS2015-2 wide-angle refraction profile was shot in the northeastern South China Sea (SCS) between refraction profiles T1 and T2 in order to better understand the variability of the crustal composition and the role of specific tectonic features. P-wave velocity models established from forward and inversion modeling imaged a 12 to 15 km-thick thinned continental crust and a high velocity layer (HVL) in the lower crust which is interpreted as magmatic underplating. Profile OBS2015-2 cut across the Taiwan transfer zone (TTZ), which separates two consecutive rifted segments of different orientations in the northeastern SCS. The TTZ is a well-defined upper crustal feature characterized by a HVL with different thickness on both sides. We have...
Tipo: Text
Palavras-chave: Northeastern South China Sea; Continent-ocean boundary (COB); Wide-angle reflection/refraction data; Thinned continental crust intruded by post-rifting volcanism; Taiwan transfer zone (TTZ).
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00443/55458/56974.pdf

Crustal structure across the post-spreading magmatic ridge of the East Sub-basin in the South China Sea: Tectonic significance
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: He, Enyuan; Zhao, Minghui; Qiu, Xuelin; Sibuet, Jean-claude; Wang, Jian; Zhang, Jiazheng.
The 140-km wide last phase of opening of the South China Sea (SCS) corresponds to a N145° direction of spreading with rift features identified on swath bathymetric data trending N055° (Sibuet et al., 2016). These N055° seafloor spreading features of the East Sub-basin are cut across by a post-spreading volcanic ridge oriented approximately E-W in its western part (Zhenbei-Huangyan seamounts chain). The knowledge of the deep crustal structure beneath this volcanic ridge is essential to elucidate not only the formation and tectonic evolution of the SCS, but also the mechanism of emplacement of the post-spreading magmatism. We use air-gun shots recorded by ocean bottom seismometers to image the deep crustal structure along the N-S oriented G8G0 seismic...
Tipo: Text
Palavras-chave: East Sub-basin of the South China Sea; Zhenbei Huangyan seamounts chain; 2-D crustal structure; Post-spreading magmatism.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00317/42858/42284.pdf