《Table 3.Density calculation from seismic velocity for model layers》

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《Crustal S-wave velocity structure across the northeastern South China Sea continental margin: implications for lithology and mantle exhumation》

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Seismic data and geochemical studies reveal that the magmatic activities in the northeastern SCS continental margin were not strong during the incipient rifting and spreading（66–26 Ma）（e.g.，Song XX et al.，2017；Fan CY et al.，2017；Xia SH et al.，2017） .Based on magnetic data analysis，Li C-F et al.（2014）found that the full spreading rate of the East Subbasin was higher（～70 km/）at the beginning of seafloor spreading from～32 to～29 Ma，and dropped to～25 km/on average from～29 to～26 Ma.The slow spreading rates support a magma-starved northeastern SCS continental margin prone to serpentinization，since many titled faults have been revealed in the thinned continental-ocean transition zone and seawater can penetrate into the already upwelled mantle.