Abstract
The role of magmatism in the thinning and breakup of the South China Sea continental margin: Special Topic: The South China Sea Ocean Drilling.
Highlights
Magmatism plays a key role in the process of continental margin breakup and ocean formation
Without seawarddipping reflectors (SDRs) being observed, most researchers suggested that the high-velocity lower crust (HVLC) in the northern continental margin was underplated either in the Mesozoic pre-rift or post-rift stages
It is proposed that this fertile asthenosphere upwelling might have arrived at the seafloor after ∼25 Ma; this is consistent with the model of increasing magmatism during early Miocene in the NE continental margin, where drilling and dredging on the seamounts suggest a peak age of 22– 24 Ma [8]
Summary
Magmatism plays a key role in the process of continental margin breakup and ocean formation. Ridge B, where Site U1500 is projected, seismic reflection shows closely arrayed dikes (Fig. 2). The seismic line SCS-1 (Fig. 3) has the best reflection quality showing clear segment boundaries, relatively good velocity control from refraction data and the IODP drilling data.
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