降扎铀矿床热水沉积硅质岩的地球化学特征  

Geochemical Characteristics of Hot Water Deposited Siliceous Rock in Jiangzha Uranium Deposit

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：《铀矿地质》2015年第2期81-88,共8页Uranium Geology

摘　　要：降扎铀矿床的赋矿主岩为碳硅泥岩富铀建造,笔者对其硅质岩的化学成分、微量元素、稀土元素及Si同位素进行研究,结果表明硅质岩为热水沉积成因。这种硅质岩可能形成于陆缘裂谷或裂谷向小洋盆过渡的环境;沉积成岩热水可能为与下伏中酸性火山岩进行水-岩反应的深循环海水。硅质岩成岩后可能还受到来自上地幔的热液叠加改造。Systemic research of major elements ,trace elements ,and Si isotope on siliceous rock samples in Jiangzha uranium deposit indicate that the rock is of hot water genesis and may formed in rift setting or rift to small ocean basin setting. The diagenesis water might was deeply cycled seawater which reacted with underlyn acidic volcanic rock and might surfer the later alteration by hydrotherm from the upper mantle.

关 键 词：降扎铀矿床 硅质岩 热水沉积成因 形成环境 热液来源 

分 类 号：P581[天文地球—岩石学] P598[天文地球—地质学]