SITE SUMMARIES (CONTINUED)

Site: MAF-4B

Priority: 1
Position: 13°46.99'N, 146°0.17'E
Water Depth: 2930 meters below sea level (mbsl)
Sediment Thickness: >1370 m
Target Drilling Depth: 400 mbsf
Approved Maximum Penetration: Pending PPSP approval
Seismic Coverage: Six-channel seismic reflection profiles collected during 1997; location of seismic profiles A-A' and B-B' across the seamount is indicated on Figure 4

Objective: Determine composition of slab-derived fluids and deep-derived metamorphosed rock materials. Set casing, reentry cone, and CORK the hole to establish a seafloor observatory

Drilling Program: XCB (ADCB) pilot hole to 400 mbsf. Drill instrumented borehole to ~400 mbsf, install reentry cone, casing, and CORK

Logging and Downhole Operations: Triple combo, FMS/sonic

Nature of Rock Anticipated: Unconsolidated mud flows of clay to sand-sized serpentine containing pebbles to boulders of serpentinized ultramafic rock and metabasalts