期刊
MARINE AND PETROLEUM GEOLOGY
卷 129, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2021.105079
关键词
Final rifting; Breakup; Rift domains; syn-Tectonic vs; syn-rift; Diachronous rifting; SW South China Sea
资金
- National Natural Science Foundation of China [41830537, 41772109]
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) [GML2019ZD0208]
This study investigates the tectono-sedimentary and magma evolution during final rifting and continental breakup along the SW conjugate margins of the South China Sea. The research concludes that the localization of deformation occurs simultaneously with magma emplacement, controlling continental breakup, and that the final rifting stage and breakup are not synchronous. The relationships observed in the SW-SCS differ significantly from classical models derived from the NAtlantic or the Alpine Tethys.
In this study, we explore the tectono-sedimentary and magma evolution of final rifting and continental breakup along the SW conjugate margins of the South China Sea (SCS). Based on new seismic observations, we define and map three rift domains, referred to as box-shaped, wedging and proto-oceanic. Each of these domains is characterized by: (1) the shape and thickness of the crust; (2) the specific architecture of the syn-rift megasequence that includes three system tracts each one including syn- and post-rift packages; and (3) different deformation styles. Results are synthetized in two Wheeler diagrams that provide a complete description of the tectono-magmatic and stratigraphic evolution of final rifting and breakup within two neighboring segments of the SW-SCS. We conclude that: 1) localization of deformation occurs simultaneous and perpendicular to the migration of magmaemplacement in front of a propagating spreading system, 2) the arrival of magma controls continental breakup, and 3) the final rifting stage and breakup are diachronous. The relationships between extension, sedimentation and magmatic processes observed in the SW-SCS differ significantly from the classical models derived from the NAtlantic or the Alpine Tethys. Main differences include the way the crust is thinning/necking, the sharp transition to breakup and the style of magma emplacement linked to crustal breakup.
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