Abstract
**angshan volcanic-related uranium ore field, as the historic largest uranium producer in China, is characterized by a large volcanic-intrusive complex and a number of uranium deposits. In most of the deposits, various types of dikes are spatially associated with the uranium ore bodies, although there have been no systematic attempts to integrate the geochronology and petrogenesis of these dykes and their link with uranium mineralization. In this study, whole-rock major and trace elements, zircon U–Pb dating and zircon Hf–O isotopic analysis were carried out on the **agnshan felsic-intermediate dikes, including granitic porphyry, quartz monzonitic porphyry and dioritic porphyry. These felsic-intermediate dikes have the similar geochemical characteristics with the major ore-hosting volcanic rocks, such as enrichment in large lithophile elements (i.e., Rb and Th) and some high-field strength elements (i.e., Zr, Y), but relative depletion in Sr, Ba, P and Ti. These dikes also exhibit zircon εHf(t) values concentrating from -9 to -4 and zircon δ18O values ranging from 7.6 to 10.0 ‰. Geochemical and isotopic data suggest that these dikes were predominantly derived from partial melting of crustal materials and possibly mingled with different proportions of mantle-derived materials during the formation of melts. SIMS and SHRIMP U–Pb dating of zircon grains from these felsic-intermediate dikes yield high-precision ages ranging from 136 to 131 Ma. Combined with previously reported age data indicates a rapid and concentrated dike emplacement event, although a few mafic-felsic dikes were sporadically emplaced at 126 -122 Ma. Such a relatively concentrated dike emplacement in the Early Cretaceous were most likely caused by the back-arc extension or intra-arc rift due to progressive rollback of the Paleo-Pacific Plate. Previous metallogenetic studies supported that the late-stage dikes at **angshan were temporally and spatially closely related to uranium mineralization. However, our new geochronological data and field observations indicate that the two episodes of uranium mineralization were not synchronous with the majority of dikes intrusions, indicating that they probably have no direct relationship in origin and that spatial coexistence were more likely due to multistage activities of faults. Rather, these dikes might act as a relatively reduced environment, and thus could facilitate the precipitation of uranium. In addition, all of these dikes can be considered favorable prospecting indicators in the **angshan ore field.
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Acknowledgements
We thank ** Liu with LA-MC-ICP-MS Lu−Hf analyses, Mu Liu and **aotong Liu with major and trace element analyses. **`an Uranium Co., Ltd., of the Nuclear Industry is extremely appreciated for the assitance during field work. We are extremely grateful to Dr. Maarten A.T.M. Broekmans (Editor in Chief), Prof. Qiuli Li (Associate Editor) and two anonymous reviewers for their thoughtful reviews and constructive comments. This paper was financially supported by the National Natural Science Foundation (41703042), the Key Project of the Ministry of Science and Technology, China (2017YFC0602600) and the Basic Research Programs from China National Nuclear Cooperation (D2002).
Funding
The authors received research fellowship from the National Natural Science Foundation, China (No. 41703042), the Key Project of the Ministry of Science and Technology, China (No. 2017YFC0602600) and the Basic Research Programs from China National Nuclear Cooperation, China (No. D2002).
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Yong-Jian Wang, Jiang-Tao Nie and **-Rong Lin conceived, designed and carried out the research. Yong-Jian Wang drafted the manuscript. Hong-Zuo Wang processed and explained some geochronological and geochemical data. All authors contributed to data interpretation, discussion, and revision of the manuscript.
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Highlights
• A relatively concentrated felsic-intermediate dike intrusion that occurred at ca. 136-122 Ma.
• Different proportions of mantle-derived materials involved in the various dikes.
• **angshan dike intrusions induced by progressive rollback of the Paleo-Pacific Plate.
• No direct relationship in origin between uranium mineralization and various types of dikes.
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Wang, YJ., Nie, JT., Lin, JR. et al. Geochronology and geochemistry of the felsic-intermediate dikes from **angshan uranium ore field, South China: Implications for petrogenesis, tectonic setting and uranium mineralization. Miner Petrol 116, 287–310 (2022). https://doi.org/10.1007/s00710-022-00780-4
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DOI: https://doi.org/10.1007/s00710-022-00780-4