Journal of Petrology Advance Access originally published online on February 25, 2005
Journal of Petrology 2005 46(6):1283-1308; doi:10.1093/petrology/egi017
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Using In Situ Trace-Element Determinations to Monitor Partial-Melting Processes in Metabasites
1 DEPARTMENT OF EARTH SCIENCES, LA TROBE UNIVERSITY, BUNDOORA, VIC 3086, AUSTRALIA
2 RESEARCH SCHOOL OF EARTH SCIENCES, AUSTRALIAN NATIONAL UNIVERSITY, CANBERRA, ACT 0200, AUSTRALIA
3 DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF ADELAIDE, ADELAIDE, SA 5005, AUSTRALIA
4 SCHOOL OF GEOSCIENCES, MONASH UNIVERSITY, CLAYTON, VIC 3800, AUSTRALIA
RECEIVED JANUARY 25, 2004; ACCEPTED JANUARY 20, 2005
Peak metamorphism (
800–850°C, 8–10 kbar) in the Harts Range Meta-Igneous Complex (Harts Range, central Australia) was associated with localized partial melting by the reaction hornblende + plagioclase + quartz + H2O = garnet + clinopyroxene + titanite + melt. In situ trace-element determinations of prograde, peak and retrograde minerals in migmatitic metabasites and associated tonalitic melts using laser-ablation ICP–MS has allowed monitoring of a range of partial-melting processes (melting, melt segregation and back-reaction between crystallizing melt and restitic minerals). Mass balance calculations indicate that titanite is a major carrier of trace elements such as Ti, Nb, Ta, Sm, U and Th, and therefore may be an important accessory phase to control the redistribution of these elements during the partial melting of amphibolites. Titanite preferentially incorporates Ta over Nb and, hence, residual titanite might assist in the formation of melts with high Nb/Ta. The fact that single minerals record different rare earth element (REE) patterns, from prograde to peak to retrograde conditions, demonstrates that REE diffusion is not significant up to 800°C. Therefore, trace-element analysis in minerals can be a powerful tool to investigate high-grade metamorphic processes beyond the limits given by major elements.
KEY WORDS: Harts Range; laser-ablation ICP–MS; metabasites; partial melting; trace elements
* Corresponding author. Telephone: +61-3-99054892. Fax: +61-3-99054903. E-mail: Ian.Buick{at}sci.monash.edu.au
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