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Priority:
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Alternate
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Position:
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17°20.652′N, 116°38.718′E
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Water depth (m):
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3942
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Target drilling depth (mbsf):
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1140
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Approved maximum penetration:
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Approved to basement + 100 m
(Estimated total depth = 1140 mbsf)
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Survey coverage (track map; seismic profile):
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Bathymetric sketch and site track map (Fig. AF37)
Deep-penetration seismic reflection:
• Primary line: ZSH275 (SP4976) (Fig. AF38)
• Crossing line: ZSHL295 (SP8495) (Fig. AF39)
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Objectives:
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• 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
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Drilling program:
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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
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Downhole logging program:
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• Triple combo
• FMS-sonic
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Nature of rock anticipated:
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(Calcareous) mudstone, siltstone, sandstone, basalt
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