Deep crustal structure of the conjugate margins of the SW South China Sea from wide-angle refraction seismic data

Pichot, Thibaud; Delescluse, Matthias; Chamot‐Rooke, Nicolas; Pubellier, Manuel; Qi, Yan; Meresse, F.; Sun, Guihua; Savva, D.; Davidson, T.N.; Watremez, Louise; Auxiètre, Jean-Luc

doi:10.1016/j.marpetgeo.2013.10.008

Cited by 111 publications

(104 citation statements)

References 59 publications

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“…A further OBS profile, "OBS Sino-French 2011 Pr1" (see Fig. 1 for location), acquired later in 2011 by the collaboration between the Guangzhou Marine Geological Survey and the Geological Laboratory of E� cole Normale Supeŕieure (Pichot et al 2014), is the only profile can be used as a comparison study with our OBS profile. We also derived the crustal thickness of several other OBS profiles that are across the margins of the SCS (Qiu et al 2001;Yan et al 2001;Niu et al 2014).…”

Section: Results From the Wide-angle Seismic Inversion: The Wavy Crusmentioning

confidence: 99%

“…Additionally, the HVL in 'OBS Sino-French Pr1' , with a maximum velocity of 7.7 kms-1, shows a rather high-velocity gradient within 2-3km thickness. Moreover, the possibility of serpentinization from the mantle was excluded considering the crustal thickness, as Pichot (2014) suggested that the pre-rift relics in the lower crust resulted in the heterogeneous velocity. Regardless, one common notion for the presence of the HVL near the Moho in the SCS is that it is not related to the stretched crust associated with episodic extension in Cenozoic.…”

Section: Results From the Wide-angle Seismic Inversion: The Wavy Crusmentioning

confidence: 99%

“…The final model is well constrained with a total RMS misfit of 124 msec between the calculated and picked traveltime, and the normalized χ 2 is around 1.5. To better interpret our crustal velocity model, we removed the velocity isocontours from the sedimentary and mantle layers from Additionally, a similar phenomenon has been identified in the study of another adjacent OBS profile 'OBS Sino-French 2011 Pr1', which showed a similar pattern of low-velocity isocontours ranging between 4.0 km s -1 and 5.5 km s -1 in a similar spatial wavelength (Pichot et al 2014), as well as the OBS profile 'OBS973-1' in the southern margin of SWSB (refer to Fig. 1 for its location), which was modeled using a different strategy where the velocity isocontour 4.0 kms-1 was used to define its basement boundary.…”

Section: Inversion Velocity Structurementioning

confidence: 99%

“…Additionally, as there is no evidence of salt or a Seaward Dipping Reflector, the margins of the SCS have been categorized as magma-poor rifted margins (Nissen et al 1995;Qiu et al 2001;Yan et al 2001;Clift et al 2002;McIntosh et al 2005;Wang et al 2006a;Qiu et al 2011;Lü et al 2011;Ruan et al 2011;Pichot et al 2014). Unlike the classic magma-poor margins of the Iberia-Newfoundland margins (Ranero and Pérez-Gussinyé 2010;Reston and McDermott 2011), the rifting of the SCS was inherently influenced by the composition and the stress field from different continents nearby, such as the Indian Peninsula, the Pacific, and the Indo-Australian Plate.…”

Section: Introductionmentioning

confidence: 99%

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The role of rifting in the development of the continental margins of the southwest subbasin, South China Sea: Insights from an OBS experiment

et al. 2016

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Section: Results From the Wide-angle Seismic Inversion: The Wavy Crusmentioning

confidence: 99%

Section: Results From the Wide-angle Seismic Inversion: The Wavy Crusmentioning

confidence: 99%

Section: Inversion Velocity Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of rifting in the development of the continental margins of the southwest subbasin, South China Sea: Insights from an OBS experiment

et al. 2016

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“…through the brittle upper crust tend to flatten and root in a denser (6.5-6.7 km/S) and smoothly-contoured material interpreted as ductile lower crust (Pichot et al, 2014).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

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, Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust, (2016), doi: 10.1016/j.gr.2017.04.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T Abstract:The

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Rifting and magmatism in the northeastern South China Sea from wide‐angle tomography and seismic reflection imaging

et al. 2014

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We present a new travel time tomography velocity model and seismic reflection images that delineate the rift architecture and magmatic features of the rifted margin in the northeastern South China Sea. These data reveal moderately stretched crust~25 km thick along the continental shelf and thin but laterally variable crustal thickness in the distal margin. Along the continental slope, crust rapidly thins tõ 4 km in a basin characterized by tilted fault blocks that sole into a low-angle detachment. Strain was localized to a degree within the highly stretched basin but failed to progress to breakup and seafloor spreading. Crust in the distal margin is~12-15 km thick. Few extensional structures are apparent in the distal margin, but seismic velocities are suggestive of highly thinned and magmatically intruded continental crust. The magmatic features we interpret include volcanic zones at the top of the basement that deform or disrupt overlying postrift strata, sills intruded into the postrift sedimentary section, and a high-velocity (~6.9-7.5 km/s) lower crustal layer that we take to be magmatic underplating or pervasive lower crustal intrusions. These features primarily occur in the distal margin and may have been emplaced during postrift seafloor spreading. The postrift magmatism may have been induced by convective removal of continental lithosphere following breakup and the onset of seafloor spreading in the South China Sea.

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Deep crustal structure of the conjugate margins of the SW South China Sea from wide-angle refraction seismic data

Cited by 111 publications

References 59 publications

The role of rifting in the development of the continental margins of the southwest subbasin, South China Sea: Insights from an OBS experiment

The role of rifting in the development of the continental margins of the southwest subbasin, South China Sea: Insights from an OBS experiment

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Rifting and magmatism in the northeastern South China Sea from wide‐angle tomography and seismic reflection imaging

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