Deep Geodynamic Mechanism of the Volcanic-Type Uranium Mineralization in Xinlu Basin, Western Zhejiang Province
详细信息
- 责任者：Wang Zhengqi (Key Laboratory of Nuclear Resources and Environment ; Ministry of Education ; East China Institute of Technology ; Fuzhou 344000 ; China) ; Li Ziying
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(5)
- 关键词：铀矿 ; uranium ores ; 浙江 ; Zhejiang Province
- 页码：p.703-714
- 图表：illus., 3 tables, 37 refs.
- 分类号：1001
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Based on analysis of the geochemical evolution of major and trace elements, and Sr-Nd isotopes of Mesozoic magmatism in the Xinlu basin, this study discussed the deep geodynamic mechanism of the volcanic -type uranium mineralization. Geochemical study shows that magmatic rocks formed from early to late periods in the basin are characterized by decreasing of SiO2 contents, increasing of alkalinity and K2O/Na2O ratios, oxide contents (turning into diabase), (LREE, δEu and Sr, and tendency change of trace elements. The evolution of Sr-Nd isotope presents a mixed trend line changing in order from Huangjian Formation ignimbrite to granite-porphyry to diabase. Fluorite representing the isotopic compositions of ore-forming fluids is projected on the mixed evolution trend line, nearer to the projection zone of diabase than granite-porphyry. It is suggested that the ore-forming fluids of the uranium deposit was of mixing features of crust and mantle sources and spatial superimposition between acidic magmatic rock and volcanic rock was the result of the Mesozoic crust-mantle interaction. Continuous upwelling of the high temperature "light material flow" that came from enriched mantle (enriched in LREE, K, Sr, etc) and its inducing crust-mantle effect provided geodynamics for magmatic activity and uranium mineralization in Xinlu basin. Therefore, the crust-mantle interaction is not only the source for driving force but the source of ore-forming fluids.
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