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Priority:
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Alternate
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Position:
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21°0.15′N, 119°47.10′E
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Water depth (m):
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3306
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Target drilling depth (mbsf):
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1210
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Approved maximum penetration:
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Approved to basement + 100 m
(Estimated total depth = 1210 mbsf)
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Survey coverage (track map; seismic profile):
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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)
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Objectives:
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• 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
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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 1210 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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