IODP

doi:10.2204/iodp.sp.324.2009

Site summaries (continued)

Proposed Site SRNH-1

Priority:
Alternate site
Position:
37°49.266’N, 162°59.220’E
Water depth
(m):
3339
Target drilling
depth (mbsf):
385 (285 m sediment, 100 m basement)
Requested
maximum
penetration
(mbsf):
~585 (300 m basement)
Survey
coverage:
Cruise TN037, R/V Thomas Thompson
• Seismic Line 5C (time: 0030Z, 11 Aug 1994) (Fig. AF7)
• Seismic Line 6 (time: 2320Z 11 Aug 1994) (Fig. AF8)
• Track map (Figs. AF9, AF10)
Objective:
(see text
for details)
• Core igneous basement from Northern High for petrographic, geochemical, isotopic, radiometric dating, and paleolatitude investigation.
• Determine the origin and emplacement history of late Shatsky Rise basement rocks.
Drilling,
coring, and
downhole
measurement
program:
Hole A
• RCB wash to ~50 m above basement, core to TD or bit failure
• Wireline log (triple combo, FMS-Sonic)
Anticipated
lithology:
• 0–83 mbsf: pelagic ooze
• 83–196 mbsf: chalk with chert
• 196–285 mbsf: shaley chalk
• >285 mbsf: basalt