PRIMARY SITE SUMMARIES

Priority: 4
Position: 7°28.22´S, 161°5.99´E
Water Depth: 2003 m
Sediment Thickness: 1200 m
Target Drilling Depth: 1300 mbsf
Approved Maximum Penetration: 1400 mbsf
Seismic Coverage: R/V Maurice Ewing EW95-11 Line 1.

Objectives: The objectives of Site OJ-7D are to

1. Obtain a minimum of 100 m of basaltic basement to determine lava composition and age.

2. Determine lava-flow thickness and flow morphology and, hence, deduce eruptive environment.

3. Obtain sedimentary record and determine sequence facies from 700 mbsf to the
sediment/basement interface.

4. Determine a minimum basement age using overlying sediments and ages of possible sediment
interbeds.

5. Define the ages of seismic sequence boundaries.

6. Determine early subsidence history and duration of possible subaerial environment.

Drilling Program: Drill without coring to 700 mbsf, then RCB to bottom of hole.

Logging and Downhole: Triple combo, FMS/sonic, and WST (cored section only).

Nature of Rock Anticipated: Limestone, chert, and basalt.