张维乾,刘斌锋,郑懋荣.贵州岩孔含铀磷块岩矿床元素地球化学及其指示意义[J].矿产勘查,2018,9(2):253-259 |
贵州岩孔含铀磷块岩矿床元素地球化学及其指示意义 |
Element geochemistry and its geological implication of uranium-bearing phosphorite deposit in Yankong, Guizhou |
投稿时间:2017-06-27 |
DOI: |
中文关键词: 含铀磷块岩 常量、微量元素 稀土元素 岩孔 贵州 |
英文关键词: uranium-bearing phosphorite,major elements,trace elements,REE,Yankong,Guizhou |
基金项目: |
|
摘要点击次数: 1892 |
全文下载次数: 1056 |
中文摘要: |
岩孔含铀磷块岩矿床位于毕节北东向构造带变形区中部岩孔背斜的北翼,矿体主要赋存在震旦系灯影组白云岩顶部的侵蚀间断面上,顶板为下寒武统牛蹄塘组底部页岩;矿体呈层状、似层状、透镜状产出,矿物组合主要为碳酸盐和磷酸盐组合、硅酸盐和磷酸盐组合,矿石构造常见为层状、致密块状,结构有泥质—胶状、变胶状、似砂状等;含铀磷块岩常量元素以CaO、MgO、P2O5、SiO2为主,铀与TiO2、Na2O、Fe2O3、MnO关系密切。微量元素以Ba、V、U、Cr、As、Mo、Y含量较高,U与Y、Sr、V、Cr关系密切。稀土元素REE较高,轻稀土富集,重稀土亏损。沉积环境参数主要指标δU>1,V/(Ni+V)>0.46,V/Cr>2,U/Th>1,反映了含铀磷块岩形成时处于缺氧有热液流体参与作用的还原环境,矿床为同生沉积成岩型含铀磷块矿床。 |
英文摘要: |
Yankong Uranium-bearing phosphorite deposit is located at the north limb of Yankong Anticline in the middle deformation zone of NE structural belt in Bijie. The orebody occurred in the erosion discontinuity face of dolomite at the top of Sinian Dengying Formation,the roof is the shale of Niutitang Formation of Lower Cambrian Series. The orebody appears in bedded,near-bedded and lenticular shapes and the minerals assemblages mainly assemblied by carbonate and phosphate or by silicate and phosphate. The tectonics of the ore mainly are stratified and compact massive,and the sturcutres are of shaly-colloform and metacolloform etc. The major elements such as CaO, MgO, P2O5 and SiO2 are the main chemical compositions in uranium-bearing phosphorite of Yankong,Uranium is closely related to TiO2,Na2O,Fe2O3 and MnO. The content of trace elements such as Ba,V,U,Cr,Sr and Y is high. Uranium is closely related to Y,Sr,V and Cr. The content of REE is higher of which the LREE is rich and HREE is in loss. The major parameters for sedimentary environment show that δU>1,V/(Ni+V)>0.46,V/Cr>2,U/Th>1,which interprets that the eviroment in which the uranium-bearing phosphorite deposit formed was a reduction environment lacking of oxygen because of the participation of hydrothermal fluid. The deposit is a uranium-bearing phosphorite deposit formed by syngenetic sedimentaries. |
查看全文
查看/发表评论 下载PDF阅读器 |
关闭 |
|
|
|