Priority: 1
Position: 24°28.36'N; 79°22.17'W
Water depth: 675 m
Sediment thickness: >8000 m
Total penetration: 753 mbsf (approved to a depth of 953 mbsf)
Seismic coverage: High-resolution MCS survey
Objectives: The objectives of BT-4 are to:
1. obtain a record of the facies of the basinal deposits associated with the prograding sequence and
2. assess and date the record of fluctuations in the strength of the Florida Current.
Drilling program:
Hole A: APC/XCB to refusal.
Hole B: APC to refusal.
Hole C: RCB to 753 m, if time permits.
Logging and downhole: ADARA heat flow measurements will be made on the first eight APC cores below Core 3, and one every third core thereafter. WSTP will be performed on every fifth XCB core. The hole will be logged using the three standard logging strings(Quad-Combination, GLT, and FMS). A VSP experiment will be performed, if time permits.
Nature of Rock Anticipated: Periplatform ooze occasionally mixed with coarser grained units.