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Summary for Field Activity Number 1983-023-FA

Alternate Leg ID: DSDP Leg 95

Area of Operations: New Jersey margin, Baltimore Canyon Trough, United States, middle Atlantic outer continental shelf and slope, North America, North Atlantic

Dates: August 17, 1983 to September 26, 1983

Objectives: The principal scientific objective of Leg 95 was to document the Cenozoic and Latest Cretaceous depositional history of the New Jersey continental slope and upper rise. Geological and geophysical analysis of continuously cored strata from these sites would allow us to establish the composition, stratigraphic framework, and depositional environments of sediments constituting shelf/rise transition; accurately date the biostratigraphic gaps and major seismic reflectors (both conformable and unconformable) in the section; document lateral variability in bio- and lithofacies and compare the facies observed with analogues from the modern slope and rise; establish paleoenvironmental cycles, detailed biostratigraphic zonations, and stable-isotopic stratigraphy; calibrate poorly known siliceous planktonic and benthic biozones with the widely applied calcareous microfossil zonations; identify depositional sequences and evaluate their relationships with seismic sequences, sea-level changes, tectonism, oceanic current patterns, water-mass composition, and sediment provenance and accumulation rates; compare and correlate the geological and geophysical record of the slope and upper rise with that of the adjacent shelf and lower rise (especially that at Site 603) and with other passive margins such as the Goban Spur on the Irish Continental Slope (drilled on Leg 80); and determine the detailed subsidence history at Site 612 by "backstripping" techniques and compare the resulting tectonic subsidence with predictions based on thermal and mechanical models for the development of passive margins.

Type of Activity: Sampling
Well

Information to be derived: Samples and chemical analysis
Grain size analysis
Morphology

Summary: Site 612: 72 cores; Site 613: 52 cores. Seismic lines were run between the sites.

USGS Project Number: DSDP

Contact: Wylie Poag (wpoag@usgs.gov)

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of GLOMAR CHALLENGER
GLOMAR CHALLENGER
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