Technical Note 20/4


LEG 171B PROSPECTUS

Table 1. Proposed Site Information and Drilling Strategy


SITE: NBR-8A		PRIORITY: 1			POSITION: 15°32.21'N, 58°43.39'W
WATER DEPTH: 4756 m	SEDIMENT THICKNESS: 800 m	TOTAL PENETRATION: 550 m
SEISMIC COVERAGE: 3-D survey, Line 736
Objectives: This site will establish the physical properties of the negative polarity reflection at this locality of the Barbados decollement. This site will also completely penetrate the underthrust section to ascertain changes in physical properties during underthrusting.

Drilling Program: No cores

Logging and Downhole Operations: Logging While Drilling

Nature of Rock Anticipated: Pelagic and hemipelagic sediments


SITE: NBR-9A		PRIORITY: 1			POSITION: 15°32.16'N, 58°42.85'W
WATER DEPTH: 4984 m	SEDIMENT THICKNESS: 810 m	TOTAL PENETRATION: 550 m
SEISMIC COVERAGE: 3D survey, Line 736
Objectives: NBR-9, located at CORK Site 949 1800 m west of the deformation front, will establish the physical properties of a decollement zone with intermediate reflection polarity characteristics and determine the physical property profile at this instrumented CORK site.

Drilling Program: No cores

Logging and Downhole Operations: Logging While Drilling

Nature of Rock Anticipated: Pelagic and hemipelagic sediments


SITE: NBR-10A		PRIORITY:			POSITION: 15°32.85'N, 58°42.198'W	
WATER DEPTH: 5052 m	SEDIMENT THICKNESS: 797 m	TOTAL PENETRATION: 400 m
SEISMIC COVERAGE: 3D survey, Line 710
Objectives: This site is located at the position of ODP Site 676A and it will determine the physical properties of the initial deformation zone of the accretionary prism.

Drilling Program: No cores

Logging and Downhole Operations: Logging While Drilling

Nature of Rock Anticipated: Pelagic and hemipelagic sediments


SITE: NBR-11A 		PRIORITY:			POSITION: 15°32.40'N, 58°38.46'W	
WATER DEPTH: 4938 m	SEDIMENT THICKNESS: 605 m	TOTAL PENETRATION: 605 m
SEISMIC COVERAGE: 3D survey, Line 751
Objectives: This site is located at the position of ODP Site 672A and will provide baseline measurements of physical properties for the incoming sedimentary section of the Barbados Ridge. It will both examine the properties of the protodecollement and establish an overall physical property profile.

Drilling Program: No cores

Logging and Downhole Operations: Logging While Drilling

Nature of Rock Anticipated: Pelagic and hemipelagic sediments

To Leg 171C

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