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Priority:
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Alternate
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Position:
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12°59.994′N, 115°0.744′E
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Water depth (m):
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4275
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Target drilling depth (mbsf):
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304
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Approved maximum penetration:
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Approved to basement + 100 m
(Estimated total depth = 304 mbsf)
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Survey coverage (track map; seismic profile):
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Bathymetric sketch and site track map (Fig. AF23)
Deep-penetration seismic reflection:
• Primary line: NDS3-2 (CDP22750) (Fig. AF30)
• Crossing line: A3B6 (CDP740) (Fig. AF31)
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Objectives:
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Alternate for SCS-4B
• Determine the age of the Southwest Sub-basin
• Test the hypothesis that the Southwest Sub-basin evolved within continental crust by rifting
• Measure magnetization, mineralization, and geochemical compositions of basement rocks
• Examine 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 304 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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