State Key Laboratory of Marine Geology;
Tongji University;
Shanghai 200092;
China;
The Institute for Geoscience Research(TIGeR);
School of Earth and Planetary Sciences;
Curtin University;
Perth 6845;
Australia;
Hainan Energy Co.;
Ltd.;
CNOOC;
Haikou 570145;
China;
South China Sea; pre-Cenozoic basement; U-Pb geochronology; Paleo-Pacific subduction; intracontinental collision; metamorphic belt;