SITE SUMMARY GAB-05B

Site: GAB-05B
(GAB-05B seismic)
(GAB-05B track line)

Priority: 1
Position: 3325.2122S, 12736.1382E
Water Depth: 488 m
Sediment Thickness: ‰3910 m
Approved Maximum Penetration: 600 m
Seismic Coverage: Intersection at SPs 995 and 13195 on AGSO Line 169/13

Objectives: The objectives of GAB-05B are to

  1. Recover a detailed record of shelf-edge siliciclastic deposition (at a "distal" site compared with Site GAB-06B) to evaluate the sedimentary response to Paleogene sea-level fluctuations and to evaluate the complex interaction between sea-level variation, accommodation space, and subsidence.
  2. Determine the characteristics of cool-water carbonate facies within the Neogene succession (Sequences 2 to 4).
  3. Determine paleoceanographic parameters within a shelf-edge setting in Sequences 2 to 4, to complement other components of the shelf-to-basin transect.
  4. Evaluate sea-level control on Neogene facies within an upper slope/shelf-edge setting (cf Sites GAB-03B and GAB-04B).
  5. Evaluate the diagenetic history and processes within Neogene facies in an upper slope/shelf edge setting.

Drilling Program: Double APC, XCB, RCB

Logging and Downhole Operations: Triple combo, FMS/Sonic, GHMT, WST

Nature of Rock Anticipated: Nanno-foram ooze/chalk and wackestone with minor grainstone (350 m); interbedded calcareous mudstone and sandstone (230 m)

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