Nature and Origin of an LCT-Suite Pegmatite With Late-Stage Sodium Enrichment, Brazil Lake, Yarmouth County, Nova Scotia. Ii. Implications of Stable Isotopes ( 18o, d) for Magma Source, Internal Crystallization and Nature of Sodium Metasomatism
Abstract:The 395 Ma Brazil Lake granitic pegmatite, a rare occurrence of an LCT-type (Li-Cs-Ta) pegmatite in the Meguma Terrane of Nova Scotia, Canada, is hosted by metasedimentary and metavolcanic rocks of the Silurian White Rock Group. Previous mineralogical studies showed the pegmatite formed in two distinct stages, an early spodumene -K-feldspar -quartz ± muscovite stage that was followed by a pervasive metasomatic stage in which albite and secondary muscovite grew at the expense of earlier K-feldspar. The economic… Show more
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