Other ID: AMCOR 1976
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: U.S. Atlantic Continental Shelf and Slope, Southeast Georgia Embayment, South Carolina, North Carolina, Baltimore Canyon Trough, Virginia, Delaware, New Jersey, New York, Massachusetts, Georges Bank, Maine, United States, North America, North Atlantic;
Principal Investigator(s): John S. Schlee, John C. Hathaway
Data Type(s): Biological Field Study: Experiments, Sampling: Geology, Location-Elevation: Navigation
Scientific Purpose/Goals: The U.S. Geological Survey Atlantic Margin Coring Project, 1976, a 60-day expedition to obtain core samples by drilling beneath the floor of the Continental Shelf and Slope of the eastern United States, was carried out in July, August and September 1976. The purpose of the program was to obtain reliable data for appraisals of environmental conditions and offshore resources. Objectives included measuring geotechnical and engineering properties of the shelf sediments, defining freshwater aquifers offshore, collecting information on possible resources such as phosphates, sand and gravel deposits, and calibrating existing geophysical data. Additional information was sought on the regional extent of geologic units, the stratigraphic column, characteristics and ages of the sediments, variance of the geochemical baseline, and zones of slope stability or potential instability. The work was carried out aboard D/V GLOMAR CONCEPTION with the assistance of the M/V L'OLONNOIS in making seismic site surveys, anchoring the drilling vessel, and transporting supplies and equipment.
Start Date: 1976-07-21
Start Port/Location: Port Arthur, TX
End Date: 1976-09-19
End Port/Location: offshore Atlantic City, NJ
Equipment Used: Corer - slow, Well drilling, Loran-C
Information to be Derived: Morphology; Samples and chemical analysis; Grain size analysis;
Summary of Activity and Data Gathered: One major finding was the discovery of relatively fresh water (salinities < 3 ppt) extending beneath the Continental Shelf as much as 60 nautical miles seaward from New Jersey coast. Water of about 1 ppt salinity was found beneath the shelf more than 7 nautical miles off Ocean City, MD and Barnegat Inlet, NJ. Analyses for light hydrocarbons in cores show highest concentrations (as much as 412,000 ppm) at sites in water deeper than 200 meters (shelf-slope break) principally in Pleistocene sediments, although methane concentrations > 400,000 ppm were found in Miocene sediments at one site near shelf edge. July 28 ship visited by R/V GEORGE T. BAGBY, GA Dept. Nat. Res., Larry Hand, Larry D. Smith; Sam M. Pickering - GA Geol. Survey; journalists: Bill Mahan - Atlanta Journal & Constitution, Robert Lamb - Atlanta Constitution, Harry Franklin - Columbus Enquirer. Aug. 17 visit via helicoptor by Tracey, Edgar, Roseboom, Hazel - USGS-Reston. Sep. 14 visited via helicoptor by Robert Rowland, Bill Dize, photographer - USGS-Reston. Well Cores: 19 (well #6002, 6004, 6004B, 6005, 6005B, 6006, 6007, 6007B, 6008, 6009, 6009B, 6010, 6011, 6012, 6013, 6013B, 6014, 6015, 6016, 6016B, 6017, 6018, 6019, 6019B, 6020, 6021, 6021B, 6021C; 1020 m in 380 cores). Site 3 encountered resistant strata (no recovery). Attempt in Gulf Stream on Blake Plateau unsuccessful because 3 knot current shook drill string.
Staff: Michael Bothner, Lawrence Poppe, Page Valentine, John S. Schlee, John C. Behrendt, Frank T. Manheim, Harley J. Knebel, John C. Hathaway, C. Wylie Poag, Barbara Tausey, Nancy Hardin, Raymond E. Hall, Francis A. Kohout, Robert E. Miller, Robert F. Commeau, Patricia Forrestel, Susan Barton, Janet Paquette
Notes: Original Center People field contained: Chief Scientists: John Hathaway, Jul. 16 - Aug. 13 and Sep. 1-19, 1976; John Schlee, Aug. 14-31, 1976. Paleontologists: C.Wylie Poag, Page C. Valentine, Charles C. Smith, Raymond E. Hall; Sedimentologists: E.G.A. Weed, Penelope M. Hanshaw, Nancy Hardin, Mario J. Carnavalle, Harley Knebel, Peter A. Scholle, John Behrendt; Water Chemists: Frank Manheim, Francis A. Kohout, James M. Weigle, Robert Schoen, Mike Bothner; Organic Chemists: David M. Schultz, David D. Brandon, Robert E. Miller; Chief Tech.: Robert F. Commeau; Core Tech.: Lawrence J. Poppe, Patricia L. Forrestel, John M. Dunley, Anna C. Sundberg, Paul W. Cousins, Martha H. Winsor, Barbara Tausey, Randy J. Fabro, Susan J. Purdy; Secretaries: Katheryn M. Seitsinger, Janet L. Gelinas, Sandra C. Merchant. All scientific party transferred by helicopter or attending vessel L'OLONNOIS (FA 76028) on July 21, Aug. 8-9 (Hurricane Belle), Aug. 12, 14, 21, 24, 29, 30, 31, Sep. 2, 13, 19, 1976.
Abbott, W.H., 1980, Diatoms and stratigraphically significant silicoflagellates from the Atlantic Margin Coring Project and other Atlantic Margin sites: Micropaleontology, v. 26 no. 1, URL: http://www.jstor.org/stable/1485273.
Buczkowski, B.J., and Kelsey, S.A., 2007, Archival policies and collections database for the Woods Hole Science Center's marine sediment samples: URL: http://pubs.usgs.gov/of/2006/1187/.
Hathaway, J.C., Schlee, J.S., Poag, C.W., Valentine, P.C., Weed, E.G.A., Bothner, M.H., Kohout, F.A., Manheim, F.T., Schoen, R., Miller, R.E., and Schultz, D.M., 1976, Preliminary summary of the 1976 Atlantic Margin Coring Project of the U.S. Geological Survey: 217 URL: http://pubs.er.usgs.gov/usgspubs/ofr/ofr76844.
Hathaway, J.C., 1971, Data File: , Continental Margin Program, Atlantic Coast of the United States, Volume 2, Sample collection and analytical data. 491 p., download PDF.
Mercado, L.G., 1981, Organic carbon, nitrogen, and calcium carbonate contents, chap. VII of Poppe, Lawrence J., ed., Data file; the 1976 Atlantic Margin Coring (AMCOR) Project of the U.S. Geological Survey: URL: http://pubs.er.usgs.gov/usgspubs/ofr/ofr81239, download PDF.
Popenoe, P., and Spalding, J.S., 1988, Isopach and structure contour maps of the Miocene and post-Miocene sediments in the southeast Georgia Embayment, Florida-Hatteras Shelf, offshore Georgia: 12 URL: http://pubs.er.usgs.gov/djvu/OFR/1988/ofr_88_397.djvu.
Richards, A.F., 1977, Atlantic Margin Coring Project 1976 preliminary report on shipboard and some laboratory geotechnical data: 159, download PDF.