Site summaries (continued)

Site SCS-1C

Priority: Alternate
Position: 21°0.15′N, 119°47.10′E
Water depth (m): 3306
Target drilling depth (mbsf): 1210
Approved maximum penetration: Approved to basement + 100 m (Estimated total depth = 1210 mbsf)
Survey coverage (track map; seismic profile): Bathymetric sketch and site track map (Fig. AF40) Deep-penetration seismic reflection:
• Primary line: 973GMGS_2 (SP6396) (Fig. AF41)
• Crossing line: ACT105 (CDP2836) (Fig. AF42)
Objectives: • To determine the nature and age of the northeasternmost South China Sea basin
• To determine if the northeasternmost South China Sea basin is affiliated with Mesozoic paleo-Pacific or Tethys oceanic crust, an attenuated continental block, or a continent-ocean transition zone
• To test if oceanic crust as old as 37 Ma exists in the northeasternmost South China Sea basin
• To examine the nature of crust subducting beneath the Luzon arc
Drilling program: Hole A:
• APC to refusal with nonmagnetic core barrels, core orientation (FlexIT tool), and APCT-3
• XCB to refusal
• Drop FFF
• RCB with nonmagnetic core barrels to 1210 mbsf
Downhole logging program: • Triple combo
• FMS-sonic
Nature of rock anticipated: (Calcareous) mudstone, siltstone, sandstone, basalt