SITE SUMMARIES

Priority: 2 (alternate)
Position: 37°59.29'N, 170°35.86'E
Water Depth: 1480 m
Sediment Thickness: 60 m
Target Drilling Depth: >210 m
Approved Maximum Penetration: 360 mbsf
Seismic Coverage: SP Lee 8-76 Oct 9 0800 UTC

Seismic line for Site HE-5A

Objectives: The objectives of Site HE-5A are to:

1.Obtain a paleolatitude and age of Ojin 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 Ojin 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: Calcareous ooze, sand, volcanic ash, and massive hawaiite and tholeiitic basalt