Journal
CHEMICAL GEOLOGY
Volume 256, Issue 3-4, Pages 146-157Publisher
ELSEVIER
DOI: 10.1016/j.chemgeo.2008.06.032
Keywords
Magma mixing; Experiments; Trace elements; Advection/diffusion; Diffusive fractionation
Categories
Funding
- MIUR (Ministero Italiano dell'Universita e della Ricerca)
- University of Perugia
- INGV (Istituto Nazionale di Geofisica e Vulcanologia)
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Magma mixing tests have been performed experimentally in a Taylor-Couette-like experimental setting. The variation of trace element concentrations along transects crossing the resultant melt column has been measured. Results indicate a strongly variable mobility of the different trace elements in the same mixing system. Such a different behaviour of trace elements tends to be enhanced as the mixing time increases, leading to the production of highly heterogeneous volumes of melts in which depletion and enrichment of trace elements occurred depending on their potential of spreading across the magma mixing system. The results presented here offer new insights into the complexity of processes expected to be operating during mixing of magmas. It is demonstrated that on short mixing times also the trace elements may become highly non-correlated. This is due to the development of chaotic advection/diffusion processes in the system. These results indicate that the onset of diffusive fractionation processes may strongly influence the patterns of data on inter-elemental diagrams depending on the relative mobility of the different elements. (c) 2008 Elsevier B.V. All rights reserved.
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