SITE SUMMARIES

Priority: 2 (alternate)
Position: 41°20.03'N, 170°22.74'E
Water Depth: 1300 m
Sediment Thickness: 42 m
Target Drilling Depth: >192 m
Approved Maximum Penetration: 342 mbsf
Seismic Coverage: Glomar Challenger Aug 8 2230 UTC; SP Lee 8-76 Oct 8 2230 UTC

Seismic line for Site HE-4A

Objectives: The objectives of Site HE-4A are to:

1.Obtain a paleolatitude and age of Nintoku Seamount to investigate processes responsible for Late Cretaceous-Early Tertiary differences between paleomagnetic data and predictions based on the Hawaiian-Emperor chain

2. Determine the geochemical signature of Nintoku Seamount

3. Determine the nature of the time-averaged geomagnetic field

4. Determine the paleointensity of the geomagnetic field

Drilling Program: RCB

Logging and Downhole: Triple combo, FMS, third-party magnetic tool

Nature of Rock Anticipated: Foramininiferal ooze, sand, calcareous ooze; volcanic sandstones, calcareous conglomerates; fossiliferous volcanic sandstone, and alkali and tholeiitic basalt