Sedimentology of Channel Infill Along the Barnegat Corridor, Offshore New Jersey Stanley Stackhouse Committee members: John Goff William Fisher Ron Steel

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Sedimentology of Channel Infill Along the
Barnegat Corridor, Offshore New JerseyStanley
StackhouseCommittee membersJohn GoffWilliam
FisherRon Steel
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Overview

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

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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. 395421.
• AHC-800 Coring on the New Jersey Shelf for ONRs
  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.
  275296

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Location Overview
80 meters water depth
30 meters water depth
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LINE 162 Outer-Shelf Channel
Estuarine Mouth Sands
Estuarine Basin Mud
Fluvial Lag
Interpretation of outer shelf channel
stratigraphy by Nordfjord et al., 2006
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Mid-Shelf Channels
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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

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Spot Sampling
First 30 cms of Core S6 Uniform equally
interval sampling
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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
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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
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Data from core 162_02 B
Depth (cm)
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Data for Core S6
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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
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Future Works

• Continued Sampling of S-Series Cores
• Sedigraph all Fine Fraction with gt 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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