Priority: 2
Position: 19°37.0'S, 11°20.4'E
Water Depth: 763 m
Sediment Thickness: >1000 m
Approved Maximum Penetration: 600 mbsf
Seismic Coverage: High-resolution MCS survey, seismic Lines GeoB 96-024 and -026
Objectives: The objective of WR-1A is to expand existing information from DSDP Sites 532 and 362 (Legs 75 and 40) providing for a cross-current transect. This site would help resolve the Walvis Ridge opal paradox, that is, the observation that the opal accumulation during glacials is much less than expected from productivity proxies.
Drilling Program:
Hole A: APC, XCB to refusal
Holes B and C: APC to refusal
Logging and Downhole*: Triple-combo, GHMT, FMS
Nature Of Rock Anticipated: Hemipelagic calcareous silty mud.
*Note: It is anticipated that this site may not be drilled, or only drilled for APC, depending on time available. In the event that there is less than 250 m penetration, no logging or other downhole measurements will be attempted.
Site: WB-A
Priority: 2
Position: 21°29.0'S, 11°15.1'E
Water Depth: 2707 m
Sediment Thickness: >1000 m
Approved Maximum Penetration: 600 mbsf
Seismic Coverage: High-resolution MCS survey, seismic Lines GeoB/AWI 96-015 and -020
Objectives: The objective of WB-A is to determine:
1.the history of the Benguela Current, and strength of coastal upwelling, as seen in messages
from filaments and in redeposited material from upslope; and
2. the climatic history of South Africa, as seen in terrigenous components.
Drilling Program:
Hole A: APC, XCB to refusal
Holes B and C: APC to refusal
Logging and Downhole*: Triple-combo, GHMT, FMS
Nature Of Rock Anticipated: Hemipelagic calcareous silty mud.
*Note: It is anticipated that this site may not be drilled, or only drilled for APC, depending on time available. In the event that there is less than 250 m penetration, no logging or other downhole measurements will be attempted.
Site: WB-B
Priority: 1
Position: 21°05.6'S, 11°49.2'E
Water Depth: 1290 m
Sediment Thickness: >1000 m
Approved Maximum Penetration: 600 m
Seismic Coverage: High-resolution MCS survey, seismic Lines GeoB/AWI 96-015 and -020
Objectives: The objectives of WB-B are to determine:
1.the history of the Benguela Current, and strength of coastal upwelling, as seen in filaments and
in redeposited material from upslope; and
2. the climatic history of South Africa, as seen in terrigenous components.
Drilling Program:
Hole A: APC, XCB to refusal
Holes B and C: APC to refusal
Logging and Downhole: Triple-combo, GHMT, FMS
Nature of Rock Anticipated: Hemipelagic calcareous silty mud.
Priority: 2
Position: 20°53.9'S, 11°13.4'E
Water Depth: 2201 m
Sediment Thickness: >1000 m
Approved Maximum Penetration: 600 mbsf
Seismic Coverage: High-resolution MCS survey, seismic Lines GeoB/AWI 96-017 and -021
Objectives: The objectives of WB-C are to determine:
1.the history of the Benguela Current, and strength of coastal upwelling, as seen in messages
from filaments and in redeposited material from upslope.
2. the climatic history of South Africa, as seen in terrigenous components.
Drilling Program:
Hole A: APC, XCB to refusal
Holes B and C: APC to refusal
Logging and Downhole*: Triple-combo, GHMT, FMS
Nature Of Rock Anticipated: Hemipelagic calcareous silty mud.
*Note: It is anticipated that this site may not be drilled, or only drilled for APC, depending on time available. In the event that there is less than 250 m penetration, no logging or other downhole measurements will be attempted.
