Site Summaries (continued) | Table of Contents

SITE SUMMARIES (continued)

Site: PAN-2A

Priority: 1
Position: 00°01.312´N, 86°42.334´W
Water Depth: 2941 m
Sediment Thickness: 282 m
Target Drilling Depth: 290 mbsf
Approved Maximum Penetration: 300 mbsf
Seismic Coverage: Sediment thickness: TWTT = 0.362 s (282 m at 1560 m/s)
Primary Line: 2000 NEMO-3 (Melville), PAN2 Line 5, 21:08:30Z JD148, SP2348
Crossing Line: 2000 NEMO-3 (Melville), PAN2 Line 1

Seismic Line 1 | Seismic Line 5 | Bathymetry map

Objectives: The objective at Site PAN-2A is to provide a continuous sedimentary sequence to study variability in equatorial upwelling on timescales ranging from the millennial to megayear, from the late Pliocene to the Holocene.

Drilling Program: Triple APC to refusal. Tensor orientation on APC cores. Single XCB to basement or refusal (expected penetration ~290 mbsf).

Logging and Downhole: Triple combo, third-party Lamont MGT, FMS/sonic, GHMT

Nature of Rock Anticipated: Site survey core is diatom-nannofossil ooze. Foraminifers and sponge spicules are common to abundant, and radiolarians are rare to common. Similar lithologies are expected downcore. Based upon its location in magnetic anomaly C2An.2n (Hey et al., 1977), the basement age should be 3.15 Ma (Cande and Kent, 1995). With a sediment thickness estimated at 282 m, the average sedimentation rate at Site PAN-2 is 90 m/m.y. Pleistocene sedimentation rate is rate 40-50 m/m.y. (assuming ash at 988 cm in core ME0005-24JC is 'L' 230 ka) or 120 m/m.y. (assuming same is "D," 84 ka).

Site Summaries (continued) | Table of Contents