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• W2898087754 abstract "The composition of melt inclusions in tourmaline was studied from graphic quartz-tourmaline intergrowth assemblages of common, muscovite – rare-element class pegmatites belonging to the lithium-caesium-tantalum family. This study applied laser ablation inductively coupled quadrupole mass spectrometry in combination with 2D and 3D microscopic volume calculation to analyse these unhomogenised melt inclusions. The determination of the analytical precision of the method is performed by repeated microscope-scanning and laser ablation analyses of tourmaline mineral inclusions in muscovite hosts for which the compositions have been independently measured by electron microprobe. The analysed melt inclusions are hosted in schorl-dravite series tourmaline from the early-Neoproterozoic pegmatite dykes of the Gatumba-Gitarama field in Rwanda. Multiple dykes have been studied, representing three regional pegmatite zones showing an increasing bulk regional degree of differentiation. The sampled graphic quartz-tourmaline assemblages are the only manifestation of an internal mineralogical zonation within these pegmatite dykes. The melt inclusions dominantly contain muscovite, quartz, dickite, feldspars, jeremejevite and childrenite minerals and variable amounts of Cs-rich, interstitial fluid. The major element composition of the ablated melt inclusions is variable but mainly plot on the low Ca-granitic compositional trend. The inclusions show, moreover, a significantly higher normative quartz content compared to bulk pegmatitic rock counterparts. The melt inclusions demonstrate a near-constant Rb concentration (100 up to 160 ppm) whereas Cs concentrations vary between 10 and 1000 ppm. Although Rb and Cs enrichment trends are accurate proxies to deduce pegmatite melt differentiation in general, both the Rb and Cs concentrations of the melt inclusions are remarkably unrelated to the regional degree of differentiation deduced from the constituent bulk rock and rock-forming minerals of the Gatumba-Gitarama pegmatites. A comparison of the alkali metal content of melt inclusions and cogenetic fluid inclusions with previously modelled bulk melt concentration indicates that this deviating Rb and Cs behaviour is caused by heterogeneous trapping of variable portions of the Cs-enriched aqueous fluid phase together with the residual melt and this during melt inclusion formation. The melt inclusions in tourmaline represent local and residual, hydrous boro-aluminosilicate melt compositions. The formation of graphic intergrowths inside the pegmatite dykes indicates rapid tourmaline growth rates causing in turn quartz saturation and nucleation in the surrounding residual melt. Fast tourmaline crystallisation contributed directly to the formation of these “melt pools” with distinct residual compositions. Our study shows that already for less-differentiated common pegmatites, melt inclusions from internal mineralogical zones represent closed melt subsystems that cannot be directly linked to the bulk system. These findings imply, moreover, that the use of tourmaline trace element compositions as an indirect geochemical proxy for the bulk melt composition of pegmatites and evolved granites, has to be considered with caution." @default.
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• W2898087754 date "2019-01-01" @default.
• W2898087754 modified "2023-10-06" @default.
• W2898087754 title "Evaluation of the petrogenetic significance of melt inclusions in pegmatitic schorl-dravite from graphic tourmaline-quartz assemblages: Application of LA-ICP-QMS analyses and volume ratio calculations" @default.
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• W2898087754 doi "https://doi.org/10.1016/j.gca.2018.10.023" @default.
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