迭部志留系硅质岩地球化学特征及成因分析  

Geochemical Characteristics and Genesis Analysis of the Silurian Siliceous Rock in Diebu

作　　者：张岩[1] 漆富成[1] 张字龙[1] 李治兴[1] 王文全[1] 杨志强[1] 

机构地区：[1]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,北京100029

出　　处：《东华理工大学学报（自然科学版）》2015年第4期375-382,460,共9页Journal of East China University of Technology(Natural Science)

基　　金：全国碳硅泥岩型铀矿资源潜力评价(DDC1629)

摘　　要：中-下志留统碳硅泥岩赋铀建造中硅质岩的主量元素、微量元素、稀土元素、Si和O同位素特征显示,下部地层中硅质岩样品的形成与火山物质相关,其形成古构造环境为边缘海环境,并具上地壳特征,硅质岩样品中的铀来源于下伏中酸性火山岩;上部地层中硅质岩样品为与生物作用有关的热水沉积硅质岩,其形成古构造环境为扩张中心(裂谷)开始活动的边缘海环境,并具幔源特征,硅质岩样品中的铀可能来源于上地幔。The main elements, trace elements, Si and O isotopes which analyses of 7 siliceous rock samples carbonate-silicate-mudstone formation located in middle-lower Silurian stratum indicate that the siliceous rocks lower formation related to volcano substance, the formation of ancient tectonic environment is marginal sea, with upper crustal features, and uranium come from intermediate-acidic volcano rock underlying. The siliceous rocks of upper formation are hydrothermal-sediment siliceous rocks which related to biological effection, the formation of ancient tectonic environment is marginal sea which its and uranium maybe come from upper mantle. centers-rift is spreading, with mantle source characteristics,

关 键 词：硅质岩 地球化学特征 热水沉积成因 志留系 

分 类 号：P588[天文地球—岩石学]