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Correlations Between Trace Metals in Sediments in Georgia

Correlations Between Trace Metals in Sediments in Georgia. Jacquelyn Bracco 4/27/2010. Why trace metals?. Trace metal concentrations affected by natural and anthropogenic causes Natural underlying geology of area Weathering rates of rocks in sediments Anthropogenic Purification of metals

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Correlations Between Trace Metals in Sediments in Georgia

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  1. Correlations Between Trace Metals in Sediments in Georgia Jacquelyn Bracco 4/27/2010

  2. Why trace metals? • Trace metal concentrations affected by natural and anthropogenic causes • Natural • underlying geology of area • Weathering rates of rocks in sediments • Anthropogenic • Purification of metals • Dyes for textiles • Dumping of pollutants • Going to look at correlations between: • Uranium (U) and Thorium (Th) • Iron (Fe) and Manganese (Mn) • Lanthanum (La) and Cerium (Ce) • Uranium (U) and Scanadium(Sc) • Titanium (Ti) and Hafnium (Hf)

  3. Geology of Georgia • Comparing correlations across four distinct regions of Georgia • Blue Ridge and Ridge and Valley: mostly metamorphosed sedimentary rocks • Piedmont: granite, igneous and metamorphic rocks • Coastal Plain: Sedimentary Rocks • Shoreline: Very young sedimentary rocks 1 2 4 3 Image taken from USGS

  4. Data Set • Data taken from the National Uranium Resource Evaluation Hydrogeochemical and Stream Sediment Reconnaissance Program (NURE) • Each data set (except for the shore) had over 2000 sample sites • Samples taken from streams Uraninite, an ore of uranium Image taken from mindat.org

  5. Pearson Correlation Coefficents • All p values fell below 0.05, so correlations are statistically significant • High Correlations: abs(r) > .5 • Medium: .5 > abs(r) > .3 • Low: .3 > abs(r)

  6. Bootstrap Correlation Coefficients • None of the data was: • Normally Distributed (Chi- square test) • Or Statistically Equivalent (F test) • All p values fell below 0.05, so correlations are statistically significant • High Correlations: abs(r) > .5 • Medium: .5 > abs(r) > .3 • Low: .3 > abs(r)

  7. Bootstrap Regression • Calculated using bootstrp with the polyfit option • Example regressions for Piedmont region of Georgia

  8. Conclusion • Correlations vary over geologic region • Possibly related to geology • Uranium and thorium, cereium and lanthanum had high correlations for all regions

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