Search

[Display omitted] • Zircon U-Pb dating results refine the emplacement age of the Xikeng pluton at 232.2 ± 1.1 Ma. • Cassiterite and wolframite U-Pb dating constrains the timing of W-Sn mineralization from Xigkeng deposit at 228.4 ± 0.90 Ma and 227.8 ± 1.60 Ma, respectively. • Source of magmatic materials was derived from reworking of crustal materials under an extensional setting. The Chongyi–Shangyou–Dayu ore-concentrated district represents one of the most important wolframite production bases in China, and most of the W-Sn deposits formed in the early Yanshanian period. The Xikeng quartz vein-type W-Sn deposit is located spatially not far from the Triassic Keshuling granitic pluton. The deposit contains 43 ore-bearing quartz veins, in which the ore minerals are mainly cassiterite and wolframite. These ore veins are concentrated in the Sinian metasandstone and sandy slate of the Laohutang Formation and extend down to the top of the concealed granite. The concealed intrusion is composed of medium- to fine-grained muscovite granites, which relate to the Indosinian Keshuling granite, according to geophysical data. Zircon grains from the concealed Xikeng granitic intrusion have a concordant U-Pb age of 232.1 ± 1.1 Ma (MSWD = 0.9). The zircon εHf(t) values range from −11.0 to −7.9, indicating primary reworking of the ancient crustal materials. Wolframite and cassiterite grains yield Tera-Wasserburg concordia intercept ages of 228.4 ± 0.9 Ma (MSWD = 1.2) and 227.8 ± 1.6 Ma (MSWD = 0.3) for the Xikeng deposit, respectively. These data demonstrate that the Indosinian W-Sn mineralization events were genetically related to granitic magma activities that share similar magmatic sources with the Yanshanian W-Sn mineralization-associated granitic intrusions. Combined with previous robust granitic and metallogenic ages, this paper identifies a new Indosinian W-Sn mineralization event in southern Jiangxi Province, Nanling Range. [ABSTRACT FROM AUTHOR]

[Display omitted] • Ages of W ores by wolframite U-Pb dating in Jinzhuping, Changkeng, Keshuling, Taoxikeng and Bikeng deposits, southern Jiangxi, are 154.2 ± 4.1 Ma, 157.8 ± 9.4 Ma, 150.3 ± 1.8 Ma, 153.8 ± 4.0 Ma and 152.3 ± 5.6 Ma, respectively. • Three stages of W mineralization occurred from the Triassic to the Lower Cretaceous in the Nanling Range of South China. In situ LA-ICP-MS provide high-resolution spatial analysis of wolframite grains. In this paper, wolframite U-Pb isotope dating is presented to directly constrain the timing of W mineralization in five granite-related vein-type W-polymetallic deposits from different ore-concentrated areas in southern Jiangxi Province, South China. In the Jinzhuping, Changkeng, Keshuling, Taoxikeng, and Bikeng deposits, wolframite is the dominant ore mineral, occurring as coarse, euhedral grains that are associated with gangue minerals such as cassiterite, scheelite, molybdenite, sphalerite, (±) galena, (±) marmatite, pyrite, quartz, (±) chlorite, (±) fluorite, and calcite. Wolframite U-Pb dating yielded 206Pb/238U ages of 154.2 ± 4.1 Ma for the Jinzhuping deposit, 157.8 ± 9.4 Ma for the Changkeng deposit, 150.3 ± 1.8 Ma for the Keshuling deposit, 153.8 ± 4.0 Ma for the Taoxikeng deposit, and 152.3 ± 5.6 Ma for the Bikeng deposit, respectively. By comparing the published minerlizing ages of the W-Sn polymetallic deposits in the Nanling region, we suggest that three stages of W mineralization occurred from the Triassic to the Lower Cretaceous. [ABSTRACT FROM AUTHOR]