Geological characteristics of early cretaceous volcanic rocks and analysis of metallogenic potential of uranium mineralization in Moganshan basin, northern Zhejiang province, China

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中文题名浙北莫干山盆地早白垩世火山岩地质特征及铀成矿潜力分析
作者Wang, XL; Zhang, WA; Cheng, SH; Wang, B; Tang, YF; Li, W
刊名FRONTIERS IN EARTH SCIENCE
2024
12
摘要
The Moganshan Volcanic Basin is located in the northeastern section of the Ganhang volcanic-tectonic-uranium polymetallic metallogenic belt. To explore the uranium mineralization potential of these volcanic rocks, petrographic, elemental geochemical, zircon U-Pb chronology, and Sr-Nd-Pb isotope analyses were performed on the volcanic rocks in the Moganshan Basin. The results showed that the volcanic rocks within the Moganshan Basin were formed at 130.8 +/- 2.0 Ma; In addition, they are Si-rich (SiO2 content of 72.98%-77.32%), alkali-rich (Na2O+ K2O, with ALK values of =7.15-9.74), and potassium-rich (K2O/Na2O content of 1.41-4.34), with light rare earth elements (Rb, Th Nd, Zr, and Hf). Further more, the volcanic rocks within the Moganshan Basin are deficient in Ba, Ta, Nb, and Sr, with a negative europium anomaly (delta Eu of 0.10-0.17), high ISr (0.71028-0.71160), low epsilon Nd(t) values (-6.43-5.77), and other characteristics. The geological characteristics of the volcanic rocks in the Moganshan Basin are the same as those of the volcanic rocks in eastern China, and the formation age is Early Cretaceous. The formation environment is intra-land extensional and tensional. The rock-forming material primarily originates from the upper crust and has a higher average uranium content than that in the Ganhang volcanic belt. Additionally, it is speculated that the Moganshan Volcanic Basin has good potential for uranium mineralization.

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