Priority: 1 (Alternate to BT-2)
Position: 24°22.96'N; 79°15.52'W
Water depth: 480 m
Sediment thickness: >8000 m
Total penetration: 883 mbsf (approved to a depth of 1090 mbsf)
Seismic coverage: High-resolution MCS survey
Objectives: The objectives of BT-21 are to:
1. obtain sedimentary record and determine facies within the different systems;
2 refine the age of the seismic sequence boundaries;
3. retrieve material to produce a high-resolution isotope stratigraphy of the Neogene to Holocene; and
4. reveal possible fluid flow through this portion of the margin
Hole A: APC/XCB to refusal.
Hole B: APC to refusal.
Hole C: Wash to XCB depth, then drill using RCB to target depth of 883 mbsf, if required time permits.
Logging and downhole: ADARA heatflow measurements will be made on the first eight APC cores below Core 3 and one every third core thereafter. The hole will be logged using four logging strings (Quad-Combination, GLT, FMS, GHMT).
Nature of rock anticipated: Periplatform ooze occasionally mixed with coarser grained units.
TO Site BT-30
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