Priority 1
Position: 24°35.41'N; 79°15.56'W
Water depth: 475 m
Sediment thickness: >8000 m
Total penetration: 822 mbsf (approved to a depth of 1020 mbsf)
Seismic coverage: High-resolution MCS survey
Objectives: The objectives of BT-20 are to:
1. assess lateral variability in facies within the prograding sequences.
2. test the lateral consistency of ages of the sequence boundaries;
3. obtain 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.
Drilling program:
Hole A: APC/XCB to refusal.
Hole B: APC to refusal.
Hole C: RCB to the target depth of 822 mbsf, if necessary and if time permits.
Logging and Downhole: ADARA heat flow measurements will be made on the first eight APC cores below cCre 3 and one every third core thereafter. The hole will be logged using three standard logging strings (Quad-Combination, GLT, FMS)).
Nature of rock anticipated: Periplatform ooze occasionally mixed with coarser grained units.