Site summaries (continued)

Site NWS-13A

Priority: Alternate
Position: 28.6710°S, 113.5605°E
Water depth (m): 200
Target drilling depth (mbsf): 330
Approved maximum penetration (mbsf): 330
Survey coverage (track map; seismic profile): Track map (Fig. AF1)
Seismic profile (Fig. AF3)
Objective(s): This site is an alternate for Site NWS-6A. Dating, coupled with seismic correlation, may provide insights into the pre-Quaternary history of the reef complex and a long-term perspective on Leeuwin Current evolution at the tropical/subtropical boundary off western Australia. Subsidence analyses of the shelf wedge drilled may extend the record back millions of years and allow more precise modeling of dynamic subsidence along the western margin of Australia. Finer grained facies in this section may also yield a Pliocene–Pleistocene record of the onset and variability of the southern Australian winter-dominated rainfall regime.
Drilling program: Triple APC, double XCB
Logging program or downhole measurements program: Triple combo, FMS, VSP
Nature of rock anticipated: Calcarenites, calcilutites