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- W4313398523 abstract "The Lingshan granite batholith (Jiangxi province, southeast China) is a rather unique example of Nb-Ta-rich rare-metal granite, and three different types of tourmalines have been identified in the marginal granite zone, including (i) quartz-tourmaline nodules (Tur-N type) in the fine-grained biotite granite, (ii) tourmaline segregations and/or tourmaline-filled cavities (Tur-P type) and (iii) tourmaline veins (Tur-PV type) in pegmatite dykes. The extensive fractional crystallization process from the fine-grained biotite granite to pegmatite has been revealed by the geochemical and boron isotope compositions from the Tur-N to the Tur-P and/or Tur-PV type tourmalines, such as increasing Fe contents, decreasing Nb/Ta and Zr/Hf ratios, as well as restricted boron isotopes (δ11B, −12.0 to −9.0‰). Particularly, the Nb and Ta contents increase from the Tur-N to the core of the Tur-P type tourmaline, and then decrease towards the rim of the Tur-P type tourmaline. It is, therefore, possible that the decreasing variations of Nb and Ta from the core to the rim within the Tur-P type tourmaline more likely record the compositional and environmental evolution from the late boron-rich magma to the exsolved hydrothermal fluids. The late-stage Tur-PV type tourmaline as the hydrothermal product contains the lowest F contents. Thus, we suggest that the NbTa mineralization in the Lingshan granite batholith dominantly occurs in the highly-evolved granitic melt rather than during the post-magmatic aqueous fluid. Furthermore, the Nb and Ta contents of Lingshan tourmaline overlap with previous reported tourmaline data from WSn rare-metal deposits instead of Au deposit. This signature is comparable to the fact that small volumes of WSn mineralization occur in the Songshugang Ta-Nb-(WSn) deposit. Hence, the Nb and Ta contents in tourmaline can be used as potential parameter to explore the Nb-Ta-(WSn) mineralization not only in the Lingshan granite and pegmatite but also in similar granite batholith elsewhere in the world." @default.
- W4313398523 created "2023-01-06" @default.
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- W4313398523 date "2023-02-01" @default.
- W4313398523 modified "2023-10-13" @default.
- W4313398523 title "Tourmaline as a tracer of magmatic-hydrothermal evolution and potential Nb-Ta-(W Sn) mineralization from the Lingshan granite batholith, Jiangxi province, southeast China" @default.
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- W4313398523 doi "https://doi.org/10.1016/j.lithos.2022.107016" @default.
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