The Beishan orogenic belt has undergone complex tectonic evolution, which leads to voluminous magmatism and mineralization. Numbers of tungsten deposits have been discovered in the Beishan orogenic belt though the geodynamic setting and timing of the deposits is poorly constrained. In this paper, we aim to figure out the evolution and mechanism of the mineralization, and constrain the geodynamic settings. Based on the analysis of ours and published ages, combining this study with the Late Paleozoic intrusions and associated mineralization, two episodes of magmatism and related coeval tungsten mineralization have been recognized during 286～226 Ma and 439～314 Ma. These magmatic events are well recorded throughout the Shuangyingshan-Huaniushan block and Xingxingxia-Hanshan block, representing by scattered intrusions and Precambrian sedimentary strata. The former suite shows high（87Sr/86Sr）i, negative εNd（t）and ancient TDM2 value, indicating an ancient crust origin, the Silurian-Carboniferous mineralization exemplified by the Hongjianbingshan, Guoqing, Yingzuihongshan and Baixianishan deposit are closely associated with subduction-accretion and generation of the Gongpoquan arc-accretionary system, whereas the latter suite shows similar（87Sr/86Sr）i, εNd（t）and TDM2 characters, suggesting the Precambrian metasedimentary strata may have exerted a significant role in the magma source. The Permian-Triassic mineralization including Liushashan and Yushan deposits are attributed to continuing accretion and subsequent post collision, supporting an arc-accretion system model, which is considered to be the best explanation for the 439～314 Ma mineralization, while the 286～226 Ma mineralization were related to post-collision events.
Ding Jiaxin Chen Yanjing Han Chunming Xiao Wenjiao Deng Xiaohua Wang Zhongmei. The tungsten deposits in Beishan, Gansu Province, NW China: Geochronological framework, spatial distribution and tectonic implication[J]. Chinese Journal of Geology, 2019, 54(4): 1349-1369.