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\begin{document}

\title{Seismic Imaging Of an Intracrustal Deformation In the Northwestern
Margin Of the South China Sea: the Role Of a Ductile Layer In the Crust}



\author[1]{Xuelin Qiu}%
\author[2]{Haibo Huang}%
\author[3]{Frauke Klingelhöfer}%
\author[2]{Yuhan Li}%
\author[2]{Ping Wang}%
\affil[1]{SouSouth China Sea Institute of Oceanology, Academia Sinica}%
\affil[2]{South China Sea Institute of Oceanology}%
\affil[3]{IFREMER}%


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  \date{June 16, 2024}


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\begin{abstract}
The continental margins of the South China Sea (SCS) have undergone
episodic rifting since the Cenozoic, and there are great divergences in
processes of the crustal deformation and seafloor opening. In this work,
we present a P-wave velocity model starting from north of Xisha Trough
to Zhongshanan Basin in the northwestern SCS margin by modeling the
ocean bottom seismometers data of a wide-angle seismic profile
OBS2013-1. The results show that the crust thins symmetrically across
the western Xisha Trough, from more than \textasciitilde{}20 km at the
flanks to \textasciitilde{}10 km in the central valley where the
sedimentary layers thicken to over 6 km. In the Zhongsha Trough closer
to the deep basin, the upper crust is detached in a \textasciitilde{}20
km wide region and the lower crust is intruded by volcanism and has
seismic velocities increased by more than \textasciitilde{}0.3 km/s. The
volcanic intrusion was blocked by a shearing boundary between the
brittle and ductile crust. A \textasciitilde{}50 km wide ocean-continent
transition region beneath the Zhongshanan Basin is underlain by
\textasciitilde{}6 km thick continental crust and shows high magnetic
anomalies related to early stage magmatism and magnetized upper mantle.
These observations, together with plate reconstructions based on gravity
and magnetic analysis, suggest that the continental margin was deformed
by crustal detachment and prominent magmatism that was followed by a
rapid accretion of the oceanic crust.%
\end{abstract}%



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