Priority:
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Primary
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Position:
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Site 1 = 146°33.7526′E, 17°6.3461′S
Site 2 = 146°33.8711′E, 17°6.3104′S
Site 3 = 146°34.0934′E, 17°6.2346′S
Site 4 = 146°34.2739′E, 17°6.1728′S
Site 5 = 146°34.4216′E, 17°6.1263′S
Site 6 = 146°34.5746′E, 17°6.0774′S
Site 7 = 146°34.6249′E, 17°6.0616′S
Site 8 = 146°35.357′E, 17°5.8356′S
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Water depth (m):
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Site 1 = 44.6
Site 2 = 43.3
Site 3 = 54
Site 4 = 63.6
Site 5 = 77.7
Site 6 = 97.6
Site 7 = 110.3
Site 8 = 167.2
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Target drilling depth (mbsf):
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Site 1 = 40 m reef
Site 2 = 40 m reef
Site 3 = 50 m terrace
Site 4 = 50 m reef
Site 5 = 80 m reef
Site 6 = 100 m reef
Site 7 = 110 m reef
Site 8 = fore-reef slope
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Approved maximum
penetration (mbsf):
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380
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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:
• Sites 819–821 (Grafton Passage); Site 822 (offshore Cairns).
• Eleven 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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