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Johnson 1998

Johnson, K.T.M. (1998). Experimental determination of partition coefficients for rare earth and high-field-strength elements between clinopyroxene, garnet, and basaltic melt at high pressures. Contributions to Mineralogy and Petrology 133(1-2): 60-68.

Clinopyroxene/melt and garnet/melt partition coefficients have been determined for Ti, Sr, Y, Zr, Nb, Hf, and rare earth elements from 19 doped experiments on 1921 Kilauea basalt. The experiments were carried out from 2.0 to 3.0 GPa and 1310 degrees to 1470 degrees C. The purpose was to derive a set of partition coefficients for high-field-strength elements (HFSE) and rare earth elements (REE) in a systematic, linked set of experiments at P and T conditions relevant to basalt petrogenesis. These data are used in melting models to understand the development of negative HFSE anomalies observed in many abyssal peridotite clinopyroxenes. It is shown that melting can account for the observed trace element patterns in some residual peridotites, but that other processes may also be needed to account for most residual mantle compositions in mid-ocean ridge systems. It is also shown that REE are more strongly fractionated by garnet at these P-T conditions than previously thought.

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	Analytical Methods
	Starting Material
	Experimental Procedure

Keywords
diopside-albite-anorthite, crystal-chemical controls, oceanic upper mantle, trace-elements, continental-crust, ion microprobe, silicate melt, mare basalts, liquid, nb

Journal
Contributions to Mineralogy and Petrology
http://link.springer.de/link/service/journals/00710/

Publisher
Springer-Verlag New York Inc.
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New York, NY 10010
USA
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