Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/26922
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- Title
- The Influence of pressure, mineral composition and water on trace element partitioning between clinopyroxene, amphibole and basanitic melts
- Related
- European journal of mineralogy, Vol. 15, Issue 5, p.831-841
- DOI
- 10.1127/0935-1221/2003/0015-0831
- Publisher
- E. Schweizerbart'sche Verlagsbuchhandlung
- Date
- 2003
- Author/Creator
- Adam, John
- Author/Creator
- Green, Trevor
- Description
- Trace and minor elements in clinopyroxenes, amphiboles and basanitic melts produced in experiments at 0.5 to 2.0 GPa and 1000 to 1050°C were analysed by LAM-ICP-MS. The analyses reproduce the results of previous electron microprobe analyses by Adam & Green (1994) but also provide data for many new elements. The expanded data set was used to evaluate the trace element partitioning models of Blundy & Wood (1994) and Wood & Blundy (1997). Although the lattice-strain model of Blundy & Wood (1994) could be successfully fitted to our data, the thermodynamic model of Wood & Blundy (1997) does not predict the negative correlations that we found between DREE and pressure. This is not explained by variations in the amounts of H₂O in our experiments. Instead, we attribute the variations in DREE to volume-reducing substitutions in octahedral and tetrahedral sites that increase the activities of +3 and +4 ions, and decrease those of +1 ions, in sites of 8-fold coordination as pressure increases. We were able to quantitatively model some of these effects using a combination of simple electrostatics, Pauling bond strengths and bond-valence calculations. Notwithstanding this, it is apparent that pressure, temperature and the properties of the melt phase also influence partition coefficients independently of mineral composition and crystal-chemical effects.
- Description
- 11 page(s)
- Subject Keyword
- trace elements
- Subject Keyword
- valence
- Subject Keyword
- clinopyroxene
- Subject Keyword
- amphibole
- Subject Keyword
- basanite
- Subject Keyword
- partitioning
- Resource Type
- journal article
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/26922
- Identifier
- ISSN:0935-1221
- Identifier
- mq-rm-2003017040
- Language
- eng
- Reviewed
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