|
Priority:
|
Primary
|
|
Position:
|
45°57.8539′S, 163°11.0531′W (WGS 84)
(45.9642°S, 163.1842°W)
|
|
Water depth (m)
|
5309
|
|
Target drilling depth (mbsf):
|
122-130
|
|
Approved maximum penetration (mbsf):
|
Until basement is encountered
|
|
Previous drilling in area:
|
Closest drilling:
• ODP Leg 181Site 1123, 400 nmi away
|
|
Comments:
|
International waters; 560 nmi from Chatham Island, New Zealand
Preferred weather window: November–December
|
|
Survey coverage
(track map, seismic profile):
|
High-resolution seismics:
• Primary line(s): MCS Line 3 - Shotpoint 17828 (Fig. AF31)
• Crossing line(s): MCS Line 1 - Shotpoint 17196 (Fig. AF32)
• Subbottom profile, 3.5 kHz: Line 3 - JDay 020 at 10:12 GMT
• Detailed bathymetry and site location (swath bathymetry: collected with SIMRAD EM120) (Fig. AF33)
|
|
Sediment cores:
|
Four gravity cores
|
|
Objectives
(see text for complete details):
|
• Document the habitats, metabolic activities, genetic composition, and biomass of microbial communities in subseafloor sediments with very low total activity.
• Test how oceanographic factors (such as surface ocean productivity) control variation in sedimentary habitats, activities, and communities from gyre center to gyre margin.
• Quantify the extent to which these sedimentary communities may be supplied with electron donors by water radiolysis, a process independent of the surface photosynthetic world.
|
|
Drilling/Coring program:
|
• Triple to quadruple APC to basement
• Temperature measurements: APCT-3
|
|
Downhole logging program:
|
Wireline logging: triple combo, FMS-sonic
|
|
Anticipated lithology:
|
Siliceous ooze
|
