Geochronology of the Chakabeishan Li–(Be) rare-element pegmatite, Zongwulong orogenic belt, northwest China: Constraints from columbite–tantalite U–Pb and muscovite–lepidolite 40Ar/39Ar dating

Age and Petrogenesis of the Dongjin Rare Metal Mineralized Intrusion in the Northern Margin of the North China Craton

“…Columbite, with high U and low common Pb contents, is hardly affected by late hydrothermal alteration. Therefore, the U-Pb dating of columbite is particularly precise, and convincing ages have been obtained in a multitude of studies [24][25][26][27][28][29]. In this study, columbite U-Pb dating for the FAG and KG yielded ages of 248.9 ± 1.9 Ma and 250.1 ± 1.1 Ma, respectively, which indicates that the Nb-Ta mineralization occurred in the Early Triassic.…”

“…As a common accessory mineral in highly fractionated granites, columbite shows limited effects of late hydrothermal alteration while possessing high U and a low abundance of Pb [24][25][26]. This leads to a highly accurate U-Pb dating of columbite, which has produced convincing results across numerous studies [24][25][26][27][28][29]. In addition, the relationship between magmatic evolution and the mineralization of the Dongjin intrusion remains unclear, and further study is urgently needed.…”

Late Triassic lithium pegmatites in Northwest China: A response to continental collision during Paleo‐Tethys Ocean closure

“…significantly controlled by regional major tectonic events (Li et al, 2019), the Chaqiabeishan pegmatites still show distinctly enriched ε Nd (t) values (À14.4 to À12.8) relative to those at Bailongshan and Jiajika (ε Nd (t) values: À11.9 to À8.9, Figure 9b). The magma source for the Bailongshan and Jiajika deposits is similar to that of the contemporaneous granites, while the pegmatite magma F I G U R E 9 (a) Histograms and relative probability of mineralizing ages (only CGMs ages are plotted) of the Jiajika (blue, Hao et al, 2015;Zhu et al, 2023), Bailongshan (grey, Wang, Han, et al, 2020;Zhou, Wang, et al, 2021) and Chaqiabeishan (red, Liu, Wang, et al, 2022;Lv et al, 2023;Pan et al, 2021;Sun, Zhao, Mo, et al, 2023;this source at Chaqiabeishan is more enriched compared with the contemporaneous granites (Figure 9b). This is a similar observation to that made for rare-metal pegmatites in the Altaids, which are related to a more evolved regional ancient crust, according to the 3D lithospheric compositional architecture of the Altaids defined by Nd-Hf isotopic contour maps (Wang et al, 2023).…”

“…Recent studies have documented the geochronological, petrogenetic and mineralogical characteristics of the Chaqiabeishan rare-metal deposit. For example, the formation ages of the barren and Li-Be pegmatites cover a wide range from 240 to 210 Ma according to different U-Th-Pb (cassiterite, columbite-group minerals and zircon, Liu et al, 2023;Liu, Sun, et al, 2022;Liu, Wang, et al, 2022;Lv et al, 2023;Pan et al, 2021;Sun, Zhao, Mo, et al, 2023;Sun, Zhao, Niu, et al, 2023;Wang, Gao, et al, 2020) and Ar-Ar dating methods (muscovite and lepidolite, Chen et al, 2022;Liu, Wang, et al, 2022).…”

“…Recent studies have documented the geochronological, petrogenetic and mineralogical characteristics of the Chaqiabeishan rare‐metal deposit. For example, the formation ages of the barren and Li‐Be pegmatites cover a wide range from 240 to 210 Ma according to different U‐Th‐Pb (cassiterite, columbite‐group minerals and zircon, Liu et al, 2023; Liu, Sun, et al, 2022; Liu, Wang, et al, 2022; Lv et al, 2023; Pan et al, 2021; Sun, Zhao, Mo, et al, 2023; Sun, Zhao, Niu, et al, 2023; Wang, Gao, et al, 2020) and Ar‐Ar dating methods (muscovite and lepidolite, Chen et al, 2022; Liu, Wang, et al, 2022). In addition, fluid metasomatism at 221 ± 5.3 Ma is evidenced by different generations of columbite‐group minerals (CGMs) (Sun, Zhao, Mo, et al, 2023) and rare‐metal enrichment and mineralization in the Chaqiabeishan deposit was controlled by high degrees of fractional crystallization of granitic magma (tourmaline boron isotopes, Sun, Zhao, Niu, et al, 2023), or by the low‐degree partial melting of clay‐rich sedimentary rocks (as evidenced by Nd isotopes from barren pegmatites) and subsequent exsolution‐accumulation of the Li‐rich magmatic fluids (Liu et al, 2023).…”