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doi:10.14379/iodp.sp.359add.2015
Site summaries
Site MAL-02A
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Priority:
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Primary
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Position:
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4.933156°N, 73.027983°E
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Jurisdiction:
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Maldives
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Water depth (m):
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483
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Target drilling depth (mbsf):
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1010 pending EPSP approval
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Approved maximum penetration (mbsf):
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560
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Survey coverage (track map; seismic profile):
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Location map (Fig. F2; see F19 in Betzler et al., 2014)
Primary line(s): Line 65 (Fig. F3; see F21 in Betzler et al., 2014)
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Objective(s):
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1. Provide detailed reconstruction of the predrowning, drowning, and postdrowning evolution of the carbonate bank by linking the seismic stratigraphic record to the sedimentary record
2. Constrain the timing of this evolution, allowing age assignments of unconformities, sedimentary interruptions, sedimentary turnovers, and onset of drift deposition
3. Reconstruct and date bank to drift turnover |
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Drilling program:
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Single APC hole to 200 mbsf and then XCB to 325 mbsf
Hole A: APCT-3 measurements and orientation
Hole B: drill to ~320 mbsf, RCB to 560 mbsf
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Logging and downhole measurement program:
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Wireline log with triple combo and FMS-sonic
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Nature of rock anticipated:
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Calcareous ooze, chalk, possibly limestone
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Site MAL-08A
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Priority:
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Alternate
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Position:
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4.90693350°N, 73.00819003°E
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Jurisdiction:
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Maldives
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Water depth (m):
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432
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Target drilling depth (mbsf):
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1100 pending EPSP approval
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Approved maximum penetration (mbsf):
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Pending EPSP approval
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Survey coverage (track map; seismic profile):
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Location map (Fig. F2)
Primary lines: Line SO236-32 (Fig. F5), Line SO236-19 (Fig. F6)
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Objective(s):
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1. Provide a detailed reconstruction of the predrowning, drowning, and postdrowning evolution of the carbonate bank by linking the seismic stratigraphic record to the sedimentary record (i.e., depositional facies)
2. Constrain the timing of this evolution, thus allowing age assignments of unconformities, sedimentary interruptions, sedimentary turnovers, and onset of drift deposition
3. Reconstruct and date the bank to drift turnover |
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Drilling program:
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Hole A: APC to 80 mbsf
Hole B: drill/wash to 80 mbsf, RCB to 1100 mbsf
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Logging and downhole measurement program:
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Wireline log with triple combo and FMS-sonic
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Nature of rock anticipated:
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Hemipelagic carbonate ooze, limestone, chalk
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Site MAL-09A
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Priority:
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Primary
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Position:
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4.85025773°N, 73.28367339°E
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Jurisdiction:
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Maldives
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Water depth (m):
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488
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Target drilling depth (mbsf):
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714 pending EPSP approval
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Approved maximum penetration (mbsf):
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Pending EPSP approval
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Survey coverage (track map; seismic profile):
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Location map (Figs. F1, F9)
Primary lines: Line SO236-35 (Fig. F10), Line SO236-05 (Fig. F11).
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Objective(s):
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1. Analyze cyclostratigraphy of drift deposits, therefore providing reconstructions of changes in the current regime and monsoon cyclicity
2. Constrain the timing of unconformities and sedimentary interruptions |
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Drilling program:
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Hole A: drill/wash to 170 mbsf, APC/XCB to 714 mbsf
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Logging and downhole measurement program:
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Wireline log with triple combo, FMS-sonic, and VSI
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Nature of rock anticipated:
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Hemipelagic carbonate ooze
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