characterization of strontium isotopes in groundwater in ... · strontium isotopes in groundwater 4...
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Characterization of Strontium Isotopes in
Groundwater in the Deep River Triassic
Basin, North Carolina
Katie Moore1, Drew Coleman1, Adrian Down2
1 University of North Carolina at Chapel Hill 2 Duke University
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(Jackson et al 2011)
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Sampling
Establish baseline water quality
Collected groundwater from
53 private drinking water wells
Analyzed for:
Major Element
Trace Metals
Methane
Noble Gases
Isotopes (C, H, Sr)
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Strontium Isotopes in Groundwater
4 naturally occurring isotopes
of Sr (84Sr, 86Sr, 87Sr, 88Sr)
87Sr produced by decay of 87Rb
(half-life ~50 Ga)
Ratio of 87Sr/86Sr varies in with
age and Rb/Sr ratio of rock
87Sr/86Sr in groundwater
primarily reflects water-rock
interaction
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Why North Carolina?
Several natural gas bearing basins
No drilling has taken place
Political interest in fracking
No significant history of oil and gas drilling
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SITE LOCATIONS
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(NC DENR 2012)
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0.7080
0.7090
0.7100
0.7110
0.7120
0.7130
0.01 0.10 1.00 10.00
87S
r/86S
r
Log Sr Concentration [ppm]
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0.7080
0.7090
0.7100
0.7110
0.7120
0.7130
0.01 0.10 1.00 10.00
87S
r/86S
r
Log Sr Concentration [ppm]
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0.708
0.709
0.710
0.711
0.712
0.713
35.40 35.42 35.44 35.46 35.48 35.50 35.52 35.54 35.56 35.58
87S
r/86S
r
Degrees Latitude
Sr Isotopes vs. Degrees Latitude
Groundwater Population 1
Groundwater Population 2
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(NC DENR 2012)
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0.708
0.709
0.710
0.711
0.712
0.713
35.40 35.42 35.44 35.46 35.48 35.50 35.52 35.54 35.56 35.58
87S
r/86S
r
Degrees Latitude
Sr Isotopes vs. Degrees Latitude
Groundwater Population 1
Groundwater Population 2
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Conclusions
Sr isotopes show a narrow range, will likely be a useful
tool for studying potential groundwater contamination
Two distinct groundwater populations
Spatial pattern of isotopic values
Patterns seen may reflect groundwater from the two
primary formations in the area
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Acknowledgements
Charlie and Elaine Mims
Dr. Drew Coleman
Adrian Down
Melinda Chapman
Courtney Beck