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• W4385155136 abstract "The Weiling granitic pegmatite is a super-large (ca. 9.20 million tons) LCT-type pegmatite body in the Northern Wuyi area of South China, with the typical mineral assemblage quartz, plagioclase, K-feldspar and muscovite as well as tourmaline (schorl-dravite), garnet (almandine-spessartine) and beryl. This overall unzoned pegmatite with locally layered texture has economic amounts of the rare metal mineral beryl and ultrapure quartz, and porcelain clay in its uppermost weathering parts. The 40Ar/39Ar dating of pegmatitic muscovite yielded a precise age of 405.33 ± 3.38 Ma, indicating this beryl-bearing pegmatite body was formed in the Early Devonian rather than in the Jurassic-Cretaceous as previously thought. Boron and Nd isotope data demonstrate that the pegmatitic melts have solely crustal sources and are most likely derived from partial melting of the ambient metasedimentary rocks from the Zhoutan Formation. Geochemical characteristics of pegmatitic minerals muscovite, beryl, tourmaline, garnet and K-feldspar and the absence of coeval fertile granites around this pegmatite suggest that the Weiling pegmatite most likely evolved from anatectic melts that did not experience significant fractionation. The pegmatitic melts were generated by low degrees of muscovite dehydration partial melting of local metasedimentary rocks rich in fluxing elements and rare metals. These melts experienced limited differentiation during ascent in the crust. The beryl mineralization formed in the medium-temperature (222-357 ℃), low-salinity (3.3-10.9 wt% NaCl equiv.) and high-density (0.62-0.86 g/cm3) H2O-NaCl-KCl-CO2-N2 system. These temperatures are much lower than typical granitic pegmatites, possibly reflecting late fluids derived from the pegmatitic magma and experienced post-crystallization alteration. The Weiling pegmatite represents a Be-bearing pegmatite that formed by partial melting of local metasedimentary rocks." @default.
• W4385155136 created "2023-07-23" @default.
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• W4385155136 date "2023-09-01" @default.
• W4385155136 modified "2023-10-14" @default.
• W4385155136 title "Petrogenesis of the Weiling beryl-bearing granitic pegmatite – a giant LCT-type pegmatite in the Northern Wuyi area, South China" @default.
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• W4385155136 doi "https://doi.org/10.1016/j.oregeorev.2023.105572" @default.
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