张家界下寒武统磷块岩中钛铀矿的晶出方式与成矿机理

发布时间：2018-06-27 01:22

本文选题：海相磷块岩 + 钛铀矿　；参考：《矿物学报》2017年03期

【摘要】：在张家界下寒武统牛蹄塘组底部海相磷块岩中首次发现了微晶钛铀矿,通过背散射电子图像、微区扫描电镜化学成分分析、元素面扫描和晶体结构分析等方法确定了钛铀矿的产出状态与晶出方式。作者认为同沉积期形成鲕粒状磷块岩并伴随海底热液喷流形成多种金属硫化物的混合物,海底热液喷流的持续,对同沉积期物质进行部分熔蚀、强熔蚀改造并发生重结晶作用,在动态环境下热液流体中多种元素处在过饱和状态出现铀多金属快速沉淀。下寒武统牛蹄塘组磷块岩中钛铀矿的发现和存在形式的确定为我国回收利用磷块岩型非常规铀资源提供了依据,也为海相磷块岩中铀多金属成矿作用与海底喷流沉积热液改造的成因联系提供了佐证。
[Abstract]:The microcrystalline titanium-uranium deposit was first found in the bottom marine phosphorite of the Lower Cambrian Niutetang formation in Zhangjiajie. The occurrence state and crystallization mode of titanium uranium ore were determined by elemental surface scanning and crystal structure analysis. The authors believe that the oolitic phosphorite formed during the synsedimentary period and the mixture of various metallic sulfides formed with the submarine hydrothermal jet, the subsea hydrothermal efflux continues, and the material in the same deposition period is partly melted, strongly melted and recrystallized. In the dynamic environment, many elements in the hydrothermal fluid are supersaturated and precipitated rapidly. The discovery and existence form of titanium uranium deposit in the phosphorus block rock of Niulitang formation of Lower Cambrian provides a basis for the recovery and utilization of unconventional uranium resources of phosphate rock type in China. It also provides evidence for the genetic relationship between uranium polymetallic mineralization in marine phosphorite and hydrothermal reformation of submarine jet deposition.
【作者单位】：核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室;
【基金】：湘西北黑色岩系非常规铀资源调查评价项目(编号:地D1703)
【分类号】：P618.47;P619.14

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