Rare earth elements partitioning

Blundy JD, Wood BJ, Davies A (1996) Thermodynamics of rare earth element partitioning between clinopyroxene and melt in the system Ca0-Mg0-Al203-Si02. Geochim Cosmochim Acta 60 359-364 Blundy JD, Robinson JAC, Wood BJ (1998) Heavy REE are compatible in clinopyroxene on the spinel Iherzolite solidus. Earth Planet Sci Lett 160 493-504... 

Michael PJ (1988) Partition coefficients for rare earth elements in mafic minerals of high silica rhyohtes the importance of accessory mineral inclusions. Geochim Cosmochim Acta 52 275-282 Mysen BO (1979) Nickel partitioning between olivine and silicate melt Henry s Law revisited. Am Mineral 64 1107-1114... 

Harrison W. J. (1978). Rare earth element partitionings between garnets, pyroxenes and melts at low trace element concentration. Carnegie Inst. Wash. Yb., 77 682-689. 

Rare earth element data will also serve as the basis for a forward modeling study to better constrain melting systematics in the Galapagos. The melting model will invoke clinopyroxene-rare earth element partition coefficients, which vary with composition (Gallahan and Nielsen, 1992), and a polybaric or column melting process. 

Recognition of the mechanisms by which trace elements are partitioned into minerals suggests the importance of looking at the relative distributions of groups of elements that have similar chemical behavior. The rare earth elements (REE), or lanthanides, have been particularly useful because they usually occur as trivalent cations that differ from each other only in ionic size. Each mineral, as it is formed, partitions the REE and other trace elements into its crystal lattice on the basis of ionic size and charge. The REE are distributed in minerals on the basis of size, and the total concentration in a rock depends upon the minerals that are present. In some cases, there is an anomaly in the behavior of Eu, which can be separated from the others when it is reduced partially to the 2 + oxidation state. 

McKay G., Le L., Wagstaff J., and Crozaz G. (1994) Experimental partitioning of rare earth elements and... 

Although the rare-earth elements (REEs) have similar geochemical behavior, since they are all large-ion lithophile elements and most of them partition among melts and mineral phases as a smooth function of ionic radius (with the exception of europium, which, commonly being... 

Wood B. J. and Blundy J. D. (1997) A predictive model for rare earth element partitioning between clinopyroxene and anhydrous silicate melt. Contrib. Mineral. Petrol. 129, 166-181. 

Dalpe C. and Baker D. R. (2000) Experimental investigation of large-ion hthophile-element, high-field-strength-element, and rare-earth-element partitioning between calcic amphibole and basaltic melt the effects of pressure and oxygen fugacity. Contrib. Mineral. Petrol. 140, 233-250. 

Gaetani G. A. and Grove T. L. (1995) Partitioning of rare-earth elements between clinopyroxene and silicate melt crystal-chemical controls. Geochim. Cosmochim. Acta 59, 1951-1962. 

Gallahan W. E. and Nielsen R. L. (1992) The partitioning of Sc, Y, and the rare-earth elements between high-Ca pyroxene and natural mafic to intermediate lavas at 1 atmosphere. Geochim. Cosmochim. Acta 56, 2387-2404. 

Hack P. J., Nielsen R. L. and Johnston A. D. (1994) Experimentally-determined rare-earth element and Y partitioning behaviour between clinopyroxene and basaltic liquids at pressures up to 20 kbar. Chem. Geol. 117, 89-105. 

Nicholls I. A. and Harris K. L. (1980) Experimental rare earth element partition coefficients for garnet, clinopyroxene and amphibole coexisting with andesitic and basaltic liquids. Geochim. Cosmochim. Acta 34, 331-340. 

White J. C. (2003) Trace element partitioning between alkali feldspar and peraUcalic quartz trachyte to rhyolite magma Part 11. Empirical equations for calculating trace element partition coefficients of large-ion lithophile, high field strength and rare-earth elements. Am. Mineral. 88, 330-337. 

Erel Y. and Stolper E. M. (1992) Modelling of rare-earth element partitioning between particles and solution in aquatic environments. Geochim. Cosmochim. Acta 57, 513-518. 

Rare earth elements have been enriched into a stationary phase composed of toluene including 2-ethyl-hexylphosphonic acid mono-2-ethyUiexyl ester (EHPA) from 1 L of aqueous solution and eluted with a stepwise pH gradient. As many elements remained in the column head because of their high partition coefficients to the stationary phase, they can be eluted with mobile phase and also separated mutually. 

Uozumi, K. Kinoshita, K. Inoue, T. Fusselman, S. Grimmett, D. Roy, J Storvick, T. Krueger, C. Nabelek, C. Pyrometallurgical partitioning of uranium and transuranic elements from rare earth elements by electrorefining and reductive extraction. J. Nucl. Sci. Techol. 2001, 38 (1), 36 4. 

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