Priority:
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Primary
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Position:
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Site 1 = 150°13.123′E, 19°42.5293′S
Site 2 = 150°13.5599′E, 19°41.8799′S
Site 3 = 150°13.8436′E, 19°41.4936′S
Site 4 = 150°13.9741′E, 19°41.3116′S
Site 5 = 150°14.2264′E, 19°40.9583′S
Site 6 = 150°14.3622′E, 19°40.759′S
Site 7 = 150°14.5828′E, 19°40.4512′S
Site 11 = 150°14.658′E, 19°40.345′S (pending IODP approval)
Site 8 = 150°14.6942′E, 19°40.2958′S
Site 9 = 50°14.7346′E, 19°40.2349′S
Site 10 = 150°15.1282′E, 19°39.6829′S
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Water depth (m):
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Site 1 = 51.4
Site 2 = 54.1
Site 3 = 57.3
Site 4 = 76.8
Site 5 = 85.3
Site 6 = 88.6
Site 7 = 96.1
Site 11 = 104.2
Site 8 = 109
Site 9 = 122.8
Site 10 = 145.1
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Target drilling depth (mbsf):
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Site 1 = 50 m reef
Site 2 = 50 m patch reef
Site 3 = 50 m reef
Site 4 = 80 m reef
Site 5 = 85 m terrace
Site 6 = 90 m reef
Site 7 = 100 m terrace
Site 11 = 100 m terrace
Site 8 = 110 m reef
Site 9 = 120 m terrace
Site 10 = fore-reef slope
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Approved maximum
penetration (mbsf):
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500
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Survey coverage:
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Seismic:
• High-resolution sparker seismic reflection data (collected September–October 2007, SS07 cruise).
• Topas PS18 seismic reflection data (collected September–October 2007, SS07 cruise).
Swath bathymetry/backscatter:
• EM300 swath bathymetry and backscatter, 10 m grid (collected September–October 2007, SS07 cruise).
Imagery:
• AUV stereographic imagery available from two dives during the SS07 cruise.
Sampling:
• Two rock dredges that recovered reef limestones during the SS07 cruise.
Other:
• Magnetics (Grafton Passage and offshore Cairns).
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Objective
(see text for details):
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To establish the course of postglacial sea level rise at the GBR (i.e., to define the exact shape of the deglaciation curve for the period 20,000 to 10,000 cal. y BP).
To define-short term paleoclimatic changes, especially SST variations, for the region over the last 20,000 y.
To analyze the impact of sea level changes on reef growth, geometry, and biological makeup.
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Drilling, coring, and downhole measurement program:
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Logging program: borehole diameter, spectral natural gamma ray, resistivity-induction, acoustic velocity, borehole optical and acoustic images, borehole hydrogeological properties.
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Anticipated lithology:
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Sediments: limestones and unconsolidated sands.
Basement: limestones.
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