Seismic evidence of hyper-stretched crust and mantle exhumation offshore Vietnam

Savva, D.; Meresse, F.; Pubellier, Manuel; Chamot‐Rooke, Nicolas; Lavier, L. L.; Po, K. Wong; Franke, Dieter; Steuer, Stephan; Sapin, François; Auxiètre, Jean-Luc; Lamy, G.

doi:10.1016/j.tecto.2013.07.010

Cited by 94 publications

(68 citation statements)

References 35 publications

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“…In the South China Sea, tectonic boudinage and ductile deformation of the continental crust have already been proposed (Savva et al, 2013) and are in agreement with previous gravity modeling (Watts and Stewart, 1998) that suggests the existence of a mechanically weak zone underlying a wide part of the margin. Here, the ductile behavior is explained by the high heat flow resulting from the rapid inversion of a former magmatic arc (Nissen et al, 1995).…”

Section: Accepted Manuscriptsupporting

confidence: 88%

“…These crustal blocks are separated by inter-boudins characterized by thinned and sheared crust covered by thick syn-tectonics sediments. Similar features are described by Savva et al (2013) zones (Reston, 1988).…”

Section: Iiib Crustal Boudinagementioning

confidence: 70%

“…Similarly, in the South China Sea, Savva et al (2013) described a rift related crustal deformation widely distributed over numerous lower crustal detachments indicating a rather delocalized and ductile deformation of the crust. For Savva et al (2013), these attributes suggest that the lithosphere was possibly warmer or…”

Section: Accepted Manuscriptmentioning

confidence: 88%

“…: Along the Cretaceous passive margins inverted in the Pyrenean range, recent work revealed the existence upper crust boudinage (Clerc and Lagabrielle, 2014;Clerc et al, 2016;Corre et al, 2016;Teixell et al, 2016) associated to strong thermal anomaly recorded in the pre-and syn-rift deposits (Clerc et al, 2015b;Lagabrielle et al, 2016). Similarly, in the South China Sea, Savva et al (2013) described a rift related crustal deformation widely distributed over numerous lower crustal detachments indicating a rather delocalized and ductile deformation of the crust. For Savva et al (2013), these attributes suggest that the lithosphere was possibly warmer or…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…9). This pattern is generally considered as an extreme, preoceanisation, crustal thinning resulting in a boudinage of the whole continental crust (Nissen et al, 1995;Franke et al, 2014;Savva et al, 2013Savva et al, , 2014.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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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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Section: Accepted Manuscriptsupporting

confidence: 88%

Section: Iiib Crustal Boudinagementioning

confidence: 70%

Section: Accepted Manuscriptmentioning

confidence: 88%

Section: Accepted Manuscriptmentioning

confidence: 98%

Section: Accepted Manuscriptmentioning

confidence: 99%

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

et al. 2018

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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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Conjugate rifted margins width and asymmetry: The interplay between lithospheric strength and thermomechanical processes

2015

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Numerical experiments have been used to relate the range in the distribution and the style of deformation observed in rifted margins to localizing/delocalizing thermomechanical processes. The experiments give rise to four end‐members of margins for varying initial lithospheric strength and extension rates. The first two end‐members are narrow and asymmetric and narrow and near‐symmetric, conjugate margins. The third end‐member is asymmetric conjugate margins, wherein one side is <100 km wide and the other is >100–300 km wide. Lastly, we explore wide rift systems that may form very asymmetric conjugate margins with one narrow margin and a very wide conjugate, 200 km to > 350 km across. With initial and boundary conditions close to that inferred from the North and South Atlantic margins, we find that not all margins experience a polyphase rifting history of stretching‐thinning‐exhumation. Instead, the stretching mode can be very short or protracted, and the thinning or the exhumation modes can be incomplete or absent. The deformation localization of the thinning mode is in places associated with the formation of a keystone block or “block H.” A new mechanism for the formation of the unstable crustal root under block H is described, wherein the bounding border faults lead to differential thinning of the crust and mantle lithosphere. Nonuniform extension also occurs in both types of wide rift systems and is related to the sequential deformation migration outward of an initial graben, associated with effective lithospheric strengthening that occurs during crustal thinning and bending.

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Seismic evidence of hyper-stretched crust and mantle exhumation offshore Vietnam

Cited by 94 publications

References 35 publications

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

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

Conjugate rifted margins width and asymmetry: The interplay between lithospheric strength and thermomechanical processes

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