Abstract
Melt-melt immiscibility and implications for the origin of Madeira albite-rich granite, Pitinga mine, Amazonas, Brazil: A melt inclusion study
Highlights
For the experimental and microanalytical study of melt inclusions, the samples were prepared as doubly polished thin sections (30-50 μm) and observed by optical microscopy and scanning electron microscopy associated with energy-dispersive spectroscopy (SEM-EDS)
Crystallized melt inclusions occur in various shapes and sizes, birefringent microcrystalline aggregates of silicate minerals with misshapen vapor phases filling the spaces between solids, and rare opaque phases (Figs. 4 and 5)
All identified inclusions were classified as primary, occurring in clusters aligned with albite, micas, and cryolite crystals that form the snowball texture in the quartz crystals of the albite-rich granite (Figs. 4A and 4B) or are aligned along growth planes arranged parallelly to faces of the euhedral quartz phenocrysts in the porphyritic granite (Fig. 5A)
Summary
Silicate melt inclusions are small quantities of silicate melt that are trapped in minerals during their growth or crystallization, and, as such, can provide information about the physical parameters and chemical compositions of the magmatic environment (Sorby 1858, Roedder 1979, 1984b, Lowenstern 1995, Frezzotti 2001) These inclusions are protected from any processes or reactions that may occur in an evolving magma-fluid environment (cooling, crystallization, decompression, degassing, contamination), recording information on a particular evolution stage of a magmatic system (Kamenetsky and Kamenetsky 2010, Amorim et al 2012). When observed at higher magnification, they appear as dark masses with poorly defined contact with their host
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