层间氧化作用:一种分散元素(Re、Se)新的富集成矿机制

Interlayer oxidation:a new mineralization mechanism for dispersed elements(Re,Se)

文章分析了分散元素成矿机制研究现状,在简要概括世界主要地区砂岩型铀矿床中分散元素富集状况的基础上,以我国511层间氧化带砂岩型铀矿床为例,阐述了分散元素Re、Se在砂岩型铀矿中的超常富集特征,论证和分析了砂岩型铀矿中分散元素超常富集的相对独立性,以及层间氧化作用机制下分散元素(Re、Se、Ge、Ga)独立成矿的可能性。认为在矿源条件具备的表生环境下,层间氧化作用促使分散元素超常富集并独立成矿是可能的。提出层间氧化作用是一种分散元素成矿新机制、新类型。建议加强分散元素基础成矿理论和检测技术方法等方面的研究。

This paper makes an review on the study of minalization mechanism of dispersed elements at first, then based on the feature summary of dispersed elements in sandstone type deposits discoved in the main minearlizion area around the world and a case study of sandstone deposit No. 512 in China, the authors elaborate the extra concertration charateristics of disperped elements （Re, Se） in the sandstone type uranium deposit, discuss their independence to concentrate extrally and possibility to form indenpendent deposit with interlayer oxidation mechanism. It is concluded that epigenetic interlayer oxidation may propell the extra-concentration of dispersed element and form independent deposit on condition of well source matter. Interlayer oxidation is a new mineraliztion type and mechanism for dispersed elements metallogeny, more attention should be paided to the study of basic theory and detecting technology for dispersed elements.