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Trace-element sanidine/glass distribution coefficients for peralkaline silicic rocks and their implications to peralkaline petrogenesis |
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| Authors: | J W Drexler T J Bornhorst D C Noble |
| Institution: | a John W. Drexler & Theodore J. Bornhorst, Department of Geology and Geological Engineering, Michigan Technological University, Houghton, Michigan 49931, U.S.A. b Donald C. Noble, Department of Geological Sciences, Mackay School of Mines, University of Nevada-Reno, Reno, Nevada 89557, U.S.A. |
| Abstract: | Sanidine/glass distribution coefficients for 11 trace elements have been determined on six peralkaline and two subalkaline silicic rocks. Distribution coefficients for Na, Sc, Fe, Cs, La, Ce, Sm, Tb and Lu from this study and the literature show little variation, within analytical uncertainty, for silicic rocks of peralkaline and subalkaline affinity. Distribution coefficients for Eu and Rb show a marked decrease with increasing peralkalinity. This variation may be the result of the decrease in the degree of polymerization from subalkaline to peralkaline silicic melts. Previous studies involving modelling of peralkaline rocks have selected, incorrectly, Eu and Rb sanidine/glass distribution coefficients determined from subalkaline silicic rocks. |
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