Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3009
AuthorsScheibner, B.* 
Worner, G.* 
Civetta, L.* 
Stosch, H.- G.* 
Simon, K.* 
Kronz, A.* 
TitleRare earth element fractionation in magmatic Ca-rich garnets
Issue Date2007
Series/Report no./ 154 (2007)
DOI10.1007/s00410-006-0179-z
URIhttp://hdl.handle.net/2122/3009
KeywordsGrandite
Ca-rich garnets
Andradite
Rare earth elements
Fractionation
Partition coefficient
Subject Classification04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry 
AbstractIgneous garnets have the potential to strongly fractionate rare earth elements (REE). Yet informations on partition coefficients are very scant, and criteria for distinguishing between hydrothermal and magmatic garnets are ambiguous. To fill this gap, we present trace element and isotopic data for two types of Ca-rich garnets from phonolites (Mt. Somma- Vesuvius). Both Ca-garnet populations are different in their style and dynamics of fractionation: one population is progressively strongly depleted in HREE from core to rim, reflecting REE fractionation in the host phonolite via earlier-crystallized garnets. Such examples for extreme changes in HREE in garnets are only known for hydrothermal grandites by REE-bearingfluids. The second garnet population is homogeneous and formed in a closed system. Near-flat patterns between Sm and Lu confirm experimental data indicating lower D(Sm)/D(Lu) for Ca-rich garnets than for e.g. pyrope-rich garnets. It follows: DGrt/PhMelt for La = 0.5, Sm = 48 and Yb = 110.
Appears in Collections:Papers Published / Papers in press

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