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Science 8 June 1973:
Vol. 180. no. 4090, pp. 1059 - 1060
DOI: 10.1126/science.180.4090.1059
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Articles

Europium Anomaly in Plagioclase Feldspar: Experimental Results and Semiquantitative Model

Daniel F. Weill 1 and Michael J. Drake 1

1 Center for Volcanology, University of Oregon, Eugene 97403

The partition of europium between plagioclase feldspar and magmatic liquid is considered in terms of the distribution coefficients for divalent and trivalent europium. A model equation is derived giving the europium anomaly in plagioclase as a function of temperature and oxygen fugacity. The model explains europium anomalies in plagioclase synthesized under controlled laboratory conditions as well as the variations of the anomaly observed in natural terrestrial and extraterrestrial igneous rocks.


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