Site: ACE-8a (see map)

Priority: 1
Position: 9°44.71'S, 151°37.52'E
Water Depth: 3175 m
Sediment Thickness: 900 m
Approved Maximum Penetration: 1500 mbsf
Seismic Coverage: EW9510-1374 (WW08 CMP 1500)
Seismic line 8

Objectives: The objectives of Site ACE-8a are to determine the:

1.sedimentology, biostratigraphy, structural fabric, and vertical motion history in the rift graben,

2.nature of basement (P-T-t, structural fabric, deformation history) in and below fault zone, and situ stress, temperature, physical properties, fluid pressure, and composition.

Drilling Program: ACE-8a Pilot hole: APC, XCB, RCB, logging. ACE-8a Reentry hole: Reentry cone and triple casing, basement coring and logging, basement logging, casing perforation, packer hydrologic testing.

Logging and Downhole Operations: Triple-combo Geophysics, FMS-sonic, BHTV, vertical seismic profile (ASI-VSP), packer experiments, temperature (Adara, DVTP/WSTP).

Nature of Rock Anticipated: Quaternary hemipelagic sediments, sheared fault zone rocks, metamorphics.

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