Chapter 5 Geochemistry
نویسندگان
چکیده
One hundred and nineteen samples of clay (n = 42), rock and sand temper (n = 7), and pottery (n = 70) from the various drainages in and around the North Carolina Sandhills were analyzed by instrumental neutron activation analysis (NAA) at the University of Missouri Research Reactor Center (MURR). Here we report the analytical methods and describe some of the chemical patterns identified in the data set. Given the overall low number of samples and the low number of samples analyzed from each site, we have less confidence in the certainty of our explanations and conclusions than we might if the sample were larger. Consequently, we consider it likely that conclusions may change as additional samples from this area are analyzed. Pottery samples were prepared for NAA and irradiated using procedures standard at MURR (see Appendix C). The analyses resulted in data for 33 elements, namely As, La, Lu, Nd, Sm, U, Yb, Ce, Co, Cr, Cs, Eu, Fe, Hf, Ni, Rb, Sb, Sc, Sr, Ta, Tb, Th, Zn, Zr, Al, Ba, Ca, Dy, K, Mn, Na, Ti, and V. In many samples, concentrations of As, Ni, and Sr were below detection limits, and these three elements were consequently removed from consideration. The analysis of data was subsequently carried out on base-10 logarithms of concentrations for the remaining 30 elements. Use of log concentrations rather than raw data compensates for differences in magnitude between major elements such as Ca on one hand and trace elements such as the rareearth or lanthanide elements on the other. Transformation to base-10 logarithms also yields a more normal distribution for many trace elements.
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White Geochemistry Chapter 7 : Trace Elements 259 Chapter 7 : Trace Elements in Igneous Processes
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