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\begin{document}

\title{Crustal structure of the Northeast South China Sea rifted margin}



\author[1]{Mateus Rodrigues de Vargas}%
\author[1,2]{Julie Tugend}%
\author[1]{Geoffroy Mohn}%
\author[3]{Nick Kuzsnir}%
\author[4]{Lin Liang-Fu}%
\affil[1]{CY Cergy Paris Université}%
\affil[2]{Commission for the Geological Map of the World}%
\affil[3]{Department of Earth, Ocean and Ecological Sciences, University of Liverpool}%
\affil[4]{Ocean Center, National Taiwan University}%


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  \date{June 15, 2024}


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\begin{abstract}
We investigate the crustal structure of the NE South China Sea (SCS)
margin to constrain its crustal thickness and basement nature with
implications for the Mesozoic and Cenozoic evolution of the SCS.
First-order interfaces interpreted from seismic reflection data were
integrated into a 3D gravity inversion scheme to determine Moho depth
and crustal thickness variations. A joint inversion of seismic and
gravity data allowed us to determine crustal density variations along 2D
profiles. The distal margin is divided into two distinct crustal
domains: the Southern Rift System (SRS), and Southern High (SH). The SRS
shows an extremely thinned continental crust on top of which thick
Cenozoic sequences are observed. It is separated from the oceanic crust
(\textasciitilde{} 6 to 8 km thick) by the SH, a comparatively thicker
crust (\textasciitilde{} 10 to 15 km thick) with numerous magmatic
additions. The distal NE SCS margin formed during the Cenozoic rifting
of the SCS. The crust of the SH likely corresponds to a polygenic crust,
recording polyphase magmatic activity since the Mesozoic, with
potentially significant activity during Cenozoic post-rift time. The NE
SCS margin is conjugate to Palawan, whose basement is interpreted to be
part of the exotic Luconia microcontinent that collided with Eurasia
during the Late Cretaceous. Basement similarities between Palawan and
the SH are highlighted, suggesting that the latter might also be part of
Luconia. Our results suggest that the suture between Eurasia and Luconia
might have acted as a preferred zone for the Cenozoic rift development.%
\end{abstract}%



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