| Reference Type | Journal (article/letter/editorial) |
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| Title | Newly recognized Late Jurassic Nb-Ta pegmatite dikes in the Maoershan-Yuechengling pegmatite district, south China: Their petrogenesis and metallogenesis |
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| Journal | Ore Geology Reviews |
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| Authors | Zhao, Chuan | Author |
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| Fu, Wei | Author |
| Liu, Xijun | Author |
| Liu, Xiao | Author |
| Feng, Meng | Author |
| Feng, Yangyang | Author |
| Gao, Pansong | Author |
| Xu, Cheng | Author |
| Wang, Chunzeng | Author |
| Year | 2025 | Volume | < 177 > |
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| Page(s) | 106470 |
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| URL | |
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| DOI | doi:10.1016/j.oregeorev.2025.106470Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17945560 | Long-form Identifier | mindat:1:5:17945560:5 |
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| GUID | 0 |
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| Full Reference | Zhao, Chuan, Fu, Wei, Liu, Xijun, Liu, Xiao, Feng, Meng, Feng, Yangyang, Gao, Pansong, Xu, Cheng, Wang, Chunzeng (2025) Newly recognized Late Jurassic Nb-Ta pegmatite dikes in the Maoershan-Yuechengling pegmatite district, south China: Their petrogenesis and metallogenesis. Ore Geology Reviews, 177. 106470 doi:10.1016/j.oregeorev.2025.106470 |
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| Plain Text | Zhao, Chuan, Fu, Wei, Liu, Xijun, Liu, Xiao, Feng, Meng, Feng, Yangyang, Gao, Pansong, Xu, Cheng, Wang, Chunzeng (2025) Newly recognized Late Jurassic Nb-Ta pegmatite dikes in the Maoershan-Yuechengling pegmatite district, south China: Their petrogenesis and metallogenesis. Ore Geology Reviews, 177. 106470 doi:10.1016/j.oregeorev.2025.106470 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | The Maoershan-Yuechengling pegmatite district (MYPD) of south China contains more than 2000 pegmatite dikes, most of which show rare-metal mineralization, for example, Nb, Ta, Be, and Rb mineralization. However, petrogenesis of the pegmatite dikes and their rare metal metallogenesis remain unclear due to lack of reliable geochronological and geochemical constraints. In this paper, we report new data of whole-rock geochemistry, Nd-Pb isotopes, and columbiteâtantalite (coltan) and zircon U-Pb ages of the pegmatite dikes and their hosting gneissic granite from the Maoâantang deposit, the largest Nb-Ta deposit known in the district. The Maoâantang pegmatite dikes occur in the Moshishui area in a linear distribution pattern due to fault structural control. The area are dominated by Caledonian granitoids and Neoproterozoic metasedimentary rocks. Two coltan U-Pb ages of the mineralized pegmatites (159.5 ± 5.4 Ma and 155.0 ± 2.7 Ma) obtained in this study distinct them from the well documented, episodic Precambrian to Mesozoic rare-metal pegmatites in south China, for example, the 832â827 Ma, 424â387 Ma, 248â198 Ma, 140â127 Ma, and 70â40 Ma mineralized pegmatites. The Maoâantang Nb-Ta pegmatites are much younger than their hosting granite which is dated at 417.2 ± 2.0 Ma in this study. The large age gap (262â258 million years) indicates no direct petrogenetic association between the pegmatites and their hosting granite. Geochemically, the pegmatites have high Rb/Sr (6.63â215.2) ratios but low Nb/Ta (0.07â0.98) and Zr/Hf (4.02â35.63) ratios, indicating that the pegmatites are highly evolved. The Nd (ΔNd(t) = -9.8 to â4.6; TDM2 = 1.35â1.79 Ga) and Pb (206Pb/204Pb = 18.267â20.497; 207Pb/204Pb = 15.628â15.834) isotopic data suggest that the parental magmas of the pegmatites were originated from a mixed source of Proterozoic crustal material with minor mantle-derived melts. Based on euhedral coltan grains, low ratios of Nb/Ta, and Zr/Hf, and the new geochronological data, it is proposed that the Maoâantang mineralized pegmatites were evolved by fractional crystallization from residual parental magmas. Late Jurassic Nb-Ta rare-metal pegmatites are notably uncommon in south China. Recognition of their occurrence not only confirms the episodic nature of the south China rare-metal mineralized pegmatites, but also guides future exploration strategy for rare metals in south China. |
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