Site summaries (continued)

Site SCS-2D

Priority: Alternate
Position: 17°20.652′N, 116°38.718′E
Water depth (m): 3942
Target drilling depth (mbsf): 1140
Approved maximum penetration: Approved to basement + 100 m (Estimated total depth = 1140 mbsf)
Survey coverage (track map; seismic profile): Bathymetric sketch and site track map (Fig. AF37) Deep-penetration seismic reflection:
• Primary line: ZSH275 (SP4976) (Fig. AF38)
• Crossing line: ZSHL295 (SP8495) (Fig. AF39)
Objectives: • Test the hypothesis that a ridge jump occurred around 26 Ma
• Measure magnetization, mineralization, and geochemical compositions of basement rocks
• Obtain basement rocks to ascertain the causes of sharp magnetic contrasts between different sub-basins and around magnetic Anomaly C8
• Study the paleoceanographic response to the opening of the South China Sea
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 1140 mbsf
Downhole logging program: • Triple combo
• FMS-sonic
Nature of rock anticipated: (Calcareous) mudstone, siltstone, sandstone, basalt