Rare-Metal Granites

Dear Colleagues,

Rare-metal granites, essentially A-type granites and peraluminous muscovite granites, host some of the most important deposits of rare metals, generally as high-tonnage, low-grade deposits. Much progress has been made in understanding this type of deposit, especially with the advent of analytical and geochronological techniques in the last 10 years, e.g., LA-ICP-MS, but there are still open questions that are poorly understood. For example, it is not clear how the particular geochemistry of rare-metal granites is achieved, what is their parent magma, or is a protolith of particular composition favors  development of rare-metal rich granites. The genesis of rare-metal enrichment is poorly understood and many processes have been proposed including: fractional crystallization, liquid immiscibility, chemical quenching, zone refining, magma mixing, gas-driven filter pressing, and fluid phase exsolution by undercooling or by first or second boiling, triggering the magmatic-hydrothermal transition. This Special Issue aims to bring together a series of papers that will help to address these and other open questions. Detailed mineralogical and textural studies of ore and gangue, and experimental and geochemical studies that provide the basis for understanding the crystallization and chemical fractionation of both gangue and ore minerals are welcomed. Isotopic, geochemical, and geochronological studies to establish the parental magma, protolith and geodynamic setting of these granites are also welcomed. This Special Issue aims to contribute to a better understanding of rare-metal enriched melts and ore formation processes.

Dr. Francisco Javier López-Moro
Guest Editor

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• protolith
• parental magma
• differentiation processes
• magmatic–hydrothermal transition
• rare-metal metallogeny
• geochemistry
• geochronology