Distribution of Major- and Trace-Elements in Igneous Minerals
Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 25184
Many aspects of the petrogenesis of igneous rocks can be addressed by analyzing the distribution of major and trace elements in igneous minerals. It is controlled by thermodynamic factors and may have a significant dependence on physicochemical parameters such as pressure, temperature or the fugacity of oxygen and other volatile components. This makes it possible to estimate the conditions of melting and magma crystallization from the composition of, respectively, (1) minerals from source-derived xenoliths (e.g., mantle xenoliths, restites in granitoids) and from melanosomes in anatectic complexes, and (2) phenocrysts and their hosted mineral and melt inclusions. The distribution of chemical components in minerals can also be controlled by kinetic factors, and complex zonation patterns in igneous minerals can arise by diffusion-controlled dissolution/growth related to the dynamics of magma chambers, which may involve processes in either open (magma mixing, refilling, degassing) or closed (magma convection, fractionational crystallization) systems. The fractionation of trace elements in magmatic processes is controlled by their mineral/melt partitioning and may result in characteristic geochemical signatures for the involvement of specific minerals in either the residuum or the extract as, for example, fractionation of HREE in basalts implying garnet in the residual mantle. On the other hand, trace element ratios such as Ce/Pb, Zr/Hf, Th/U, Th/Nb and Nb/Ta, as well as the composition of xenocrysts and their hosted mineral inclusions provide valuable constraints on the nature of magma sources.
This Special Issue aims to bring together contributions on major and trace element compositions of natural and synthetic minerals to address questions about the nature of magmatic sources, the mineral controls on trace element fractionation in magmatic processes, and the physicochemical conditions of melting and magma crystallization.
Prof. Dr. José Francisco Molina
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- major and trace element geochemistry
- element distribution in igneous minerals
- thermodynamic and kinetic controls of element distribution
- magmatic sources
- major and trace element fractionation
- igneous thermobarometry
- physicochemical conditions of melting and magma crystallization