Abstract
The alteration zone around pegmatites can be used as a direct tool to trace the property of pegmatite-derived fluids. In the present study, EPMA, LA-ICP-MS, and MC-ICP-MS were used to analyze major elements, trace elements and boron isotope compositions of tourmaline from Qinghe barren pegmatite, NW China. Most tourmalines from the pegmatite are schorl, while the remaining tourmalines from the pegmatite, the contact zone, the altered wall rock and the unaltered wall rock are dravite. All tourmalines follow the exchange vector (Fe + Mg) (Al + Xvac)−1, indicating enriched Fe and Mg. The Fe3+Al−1 exchange vector and increase of V/Sc in the late stage suggest sudden destruction of the pegmatite system. The δ11B indicates that a small scale fluid exsolution occurred in the late stage. Compared with other fertile pegmatites around the world, Qinghe pegmatite has the most negative δ11B and lower Li content, indicating that both the source and evolution process have an impact thereon.
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