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A 3D Snapshot of Crustal Breakup Deduced From Seismic Analysis of the Tip of the NW South China Sea

Abstract : Based on a high-resolution seismic reflection data set, we describe and map rift domains at the tip of the V-shaped NW-South China Sea (NW-SCS) Basin. We compare our rift domain map with seismic refraction, magnetic and gravity field data, and previously mapped Continent-Ocean Boundaries (COB). We also define and map syn-breakup sedimentary and magmatic sequences across the sediment-rich NW-SCS, which enables us to reconstruct the tectono-stratigraphic evolution of the area. This work enables us to describe and discuss the 3D architecture and nature of the crust at the tip of the NW-SCS, investigate how extensional and magmatic processes interacted during the breakup, and propose a kinematic model for late rifting, breakup, and finally stalling of the seafloor spreading system. This study provides exceptionally well-documented insights into the spatial and temporal evolution at the tip of a so-called "rift propagator," and enables us to show that breakup in the NW-SCS may rather correspond to a "retrogrador," in which the extension zone retreats due to the reorganization of a failing rift system.
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https://hal-insu.archives-ouvertes.fr/insu-03824792
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Submitted on : Friday, October 21, 2022 - 4:52:40 PM
Last modification on : Saturday, October 22, 2022 - 5:05:59 AM

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P. Chao, G. Manatschal, P. Chenin, C. Zhang, J. Ren, et al.. A 3D Snapshot of Crustal Breakup Deduced From Seismic Analysis of the Tip of the NW South China Sea. TECTONICS, 2022, 41, ⟨10.1029/2021TC007127⟩. ⟨insu-03824792⟩

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