Priority:
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Primary
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Position:
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Site 1 = 150°26.6047′E, 19°51.06′S
Site 2 = 150°26.8469′E, 19°50.6955′S
Site 3 = 150°27.5453′E, 19°49.6643′S
Site 4 = 150°27.8485′E, 19°49.2161′S
Site 5 = 150°27.9361′E, 19°49.09′S
Site 6 = 150°28.3187′E, 19°48.5219′S
Site 7 = 150°28.6671′E, 19°48.0469′S
Site 12 = 150°28.732′E, 19°47.963′S
(pending IODP approval)
Site 8 = 150°28.7996′E, 19°47.8829′S
Site 9 = 150°28.8521′E, 19°47.8208′S
Site 10 = 150°28.8848′, E19°47.7771′S
Site 11 = 150°29.2987′, E19°47.1391′S
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Water depth (m):
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Site 1 = 30.9
Site 2 = 51.3
Site 3 = 69.7
Site 4 = 53.7
Site 5 = 62.9
Site 6 = 90.5
Site 7 = 94.5
Site 12 = 102.2
Site 8 = 110.8
Site 9 = 122.1
Site 10 = 122.9
Site 11 = 162.1
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Target drilling depth (mbsf):
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Site 1 = 40 m reef
Site 2 = 50 m reef
Site 3 = 60 m lagoon
Site 4 = 60 m reef
Site 5 = 60 m reef
Site 6 = 90 m terrace
Site 7 = 100 m reef
Site 12 = 100 m reef
Site 8 = 110 m reef
Site 9 = 120 m reef
Site 10 = 120 m reef
Site 11 = fore-reef slope
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Approved maximum
penetration (mbsf):
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540
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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 one dive during the SS07 cruise.
Sampling:
• Six 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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