Experimental study of radium partitioning between anorthite and melt at 1 atm

Creators: Miller, Sarah A.; Burnett, Donald S.; Phinney, Douglas I.; Hutcheon, Ian D.; Asimow, Paul D.

Abstract

We present the first experimental radium mineral/melt partitioning data, specifically between anorthite and a CMAS melt at atmospheric pressure. ^(226)Ra disequilibria are an important chronometer of recent magmatic activity. Ion microprobe measurement of coexisting anorthite and glass phases produces a molar D_Ra = 0.040 ± 0.006 and D_(Ra)/D_(Ba) = 0.24 ± 0.05 at 1400 °C. Our results indicate that lattice strain partitioning models fit the divalent (Ca, Sr, Ba, Ra) partition coefficient data of this study well, supporting previous work on crustal melting and magma chamber dynamics that has relied on such models to approximate radium partitioning behavior in the absence of experimentally determined values.

Additional Information

© 2007 Mineralogical Society of America. Manuscript received: March 19, 2007; manuscript accepted: May 10, 2007; manuscript handled by Bryan Chakoumakos. The authors thank Haick Issaian and Andre Jefferson of the Caltech Safety Office for their time and expertise in assisting with safe handling of materials. NORIT Americas, Inc. generously donated activated charcoal for radon containment. Constructive reviews by Kari Cooper and Ken Sims improved the manuscript. This work was supported by NASA grants NAG5-11640 and NNG05GH79G to D. Burnett and NNH04AB47I to I. Hutcheon, NSF EAR-0239513 to P. Asimow and LLNL Laboratory Directed Research and Development funding. This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract W-7405-ENG-48.

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes

Experimental study of radium partitioning between anorthite and melt at 1 atm

Abstract

Additional Information

Additional details