Sedimentology of Channel Infill along the Barnegat Corridor, Offshore New Jersey

1. Sedimentology of Channel Infill Along the Barnegat Corridor, Offshore New JerseyStanley StackhouseCommittee members:John GoffWilliam FisherRon Steel

2. Overview • Previous Works • Location • Seismic Line and Core Location • Methods • Data • Results • Future Works

3. Notable Previous Work • Duncan, C.S., Goff, J.A., AND Austin, J.A., JR., 2000, Tracking the last sea-level cycle: seafloor morphology and shallow stratigraphy of the latest Quaternary New Jersey middle continental shelf: Marine Geology, v. 170, p. 395–421. • “AHC-800 Coring on the New Jersey Shelf for ONR’s Geoclutter Initiative,” 2002 Aboard R/V Knorr • Nordfjord, S., Goff, J. A., Austin, J. A., Jr., Gulick, S. P. S., Alexander, C., Sommerfield, C. K. and Schock, S., 2004, "Seismic facies analysis of shallowly buried channel systems on the New Jersey outer shelf: • Goff, J.A., Austin, J.A., JR., Gulick, S.P.S., Nordfjord, S., Christensen, B., Sommerfield, C.K., Olson, H.C., AND Alexander, C., 2005, Recent and modern marine erosion on the New Jersey Outer Shelf: Marine Geology, v. 216, p. 275–296

4. Location Overview 80 meters water depth 30 meters water depth

5. LINE 162: Outer-Shelf Channel Estuarine Mouth Sands Estuarine Basin Mud Fluvial Lag Interpretation of outer shelf channel stratigraphy by Nordfjord et al., 2006

6. Mid-Shelf Channels

7. Methods • 2007 Vibracoring Expedition Offshore New Jersey • Spot Sampled Cores at Lamont Doherty Earth Observatory Core Repository • Grain Size Analysis via Pipette Method • Calculate Percentage of Sand, Silt, Clay • Sedigraph Fine Fraction

8. Spot Sampling First 30+ cms of Core S6 Uniform equally interval sampling

9. Grain Size Analysis: Pipette Method Wash ~20-30 grams of sediment thru a #230 sieve into a 1000ml funnel. Remaining material in sieve is coarse fraction. Pipette out 25ml of slurry 10cm within the column. (silt/clay content) After 2hrs 3mins repeat pipette step to obtain clay content. Samples are placed into pre-weighted weighing dishes and placed in the oven to dry

10. Grain Size Calculations 3 samples Coarse fraction Silt/Clay fraction Clay fraction 2. Subtract Clay fraction form Silt/Clay fraction to obtain only Clay Fraction. 1. Weigh each sample and subtract all of the pre-weighted dish weights from each. 3. Add Coarse + Silt + Clay = Total dry weight of initial sample (Coarse or Silt or Clay/ Total dry weight) * 100 = % sand, silt or clay *all measurements are in grams

11. Data from core 162_02 B Depth (cm)

12. Data for Core S6

13. Results and Interpretation Based on grain size analysis, as well density log data, it is apparent that S6 core is sandier than core 162_02B. We suggest the sediment from S6 was deposited in a higher energy environment than that of the sediment in the core 162_02B. Core S6 shows cyclic layering. Some of the cycles are marked by erosive bases. S6

14. Future Works • Continued Sampling of S-Series Cores • Sedigraph all Fine Fraction with > 20% clay • Foraminiferal Assemblages • Bulk Carbon Dating • Possible heavy mineral separation • Possible analog x-ray of cores to expose sedimentary structures • Down Core Comparison of S-Series Cores with 162_02 Cores as well as AHC 800 series Cores from 2002 cruise.

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