Magmatic-hydrothermal evolution and rare metal enrichment of the Huoshibulake B-rich rare metal granite in the Southern Tianshan: Insights from texture, geochemistry, and Hf O isotopes of zircon

Wu, Huanhuan; Huang, He; Zhang, Zhaochong; Pan, Beibei; Li, Haizhou; Gao, Yongbao; Gardiner, Nicholas J.; Finch, Adrian A.

doi:10.1016/j.lithos.2024.107705

Lithos

2024

DOI: 10.1016/j.lithos.2024.107705

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Magmatic-hydrothermal evolution and rare metal enrichment of the Huoshibulake B-rich rare metal granite in the Southern Tianshan: Insights from texture, geochemistry, and Hf O isotopes of zircon

Huanhuan Wu,

He Huang,

Zhaochong Zhang

et al.

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Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems

Wu,

Huang,

Zhang

et al. 2024

American Mineralogist

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The magmatic-hydrothermal transition in granite-related rare-metal metallogenic systems has received great attention, as economic rare metal (including rare earth) minerals reach saturation and trigger mineralization at this stage. However, deciphering the details of the melt-fluid evolution process and the distribution behavior of rare metals remains difficult. Here, we applied tourmaline chemistry and B isotopes to unravel processes at the magmatic-hydrothermal transition that are responsible for rare-metal partitioning in the Huoshibulake (HS) and Tamu (TM) REE-Nb-mineralized intrusions in Southern Tianshan, SW Central Asian Orogenic Belt. Three types of tourmaline are identified in the plutons: (1) disseminated tourmaline in the granite, with a brown-yellow core (HS-DB) and blue-green rim (HS-DG); ( 2) orbicular tourmaline, with a brown-yellow core (HS-OB and TM-OB) and blue-green rim (HS-OG and TM-OG); (3) vein tourmaline (HS-V and TM-V). Compositionally, all these tourmalines exhibit extremely low Ca and Mg contents and are classified as schorl. The substitution processes of major-element variations are dominantly caused by (Al, □) (Fe, Na) −1 exchange vectors. Four generations of tourmaline crystallization are established based on the petrographic, compositional, and B isotopes evolution of the tourmaline. Firstly, the HS-DB crystals crystallized from the highly evolved residual melt, and then HS-OB and TM-OB precipitated from immiscible B-rich aqueous melts during the magmatic-hydrothermal transition. Subsequently, the blue-green overgrowths (HS-DG, HS-OG, and TM-OG) crystallized from exsolved hydrothermal fluids. Finally, the formation of HS-V and TM-V resulted from another melt pulse from This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems

Wu,

Huang,

Zhang

et al. 2024

American Mineralogist

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Magmatic-hydrothermal evolution and rare metal enrichment of the Huoshibulake B-rich rare metal granite in the Southern Tianshan: Insights from texture, geochemistry, and Hf O isotopes of zircon

Cited by 1 publication

References 73 publications

Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems

Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems

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