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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第42卷

期数:

2020年第06期

页码:

833-848

栏目:

非主题来稿

出版日期:

2020-11-15

文章信息/Info

Title:

Geological Characteristics and Uranium Metallogenic Conditions of Middle Jurassic Yan'an Formation in the Northeastern of Ordos Basin, China

文章编号:

1672-6561(2020)06-0833-16

作者:

李瑞霜¹; 2; 刘战庆^1*; 杨胜富²

1. 桂林理工大学 地球科学学院,广西 桂林 541004; 2. 核工业二〇八大队,内蒙古 包头 014010

Author(s):

LI Rui-shuang¹; 2;  LIU Zhan-qing^1*;  YANG Sheng-fu²

1. College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. No.208 Geological Party, CNNC, Baotou 014010, Inner Mongolia, China

关键词:

砂岩型铀矿;  地质特征;  延安组;  层间氧化带;  灰色砂体;  成矿条件;  伊盟隆起;  鄂尔多斯盆地

Keywords:

sandstone-type uranium deposit;  geological characteristic;  Yan'an Formation;  interlayer oxidation zone;  grey sandbody;  metallogenic condition;  Yimeng uplift;  Ordos Basin

分类号:

P619.14

DOI:

10.19814/j.jese.2020.08010

文献标志码:

A

摘要:

鄂尔多斯盆地是中国砂岩型铀矿的重要产区,赋矿岩层主要为中侏罗统直罗组下段砂岩层,其下部中侏罗统延安组研究程度较低,找矿成果不显著。对鄂尔多斯盆地东北部中侏罗统延安组沉积体系、砂体、层间氧化带、岩石矿物学及铀赋存形式等进行了系统分析。结果表明:延安组属于河流-三角洲沉积体系,自下而上可分为Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ共5个岩段。其中,Ⅰ、Ⅴ岩段分别为辫状河相和曲流河相沉积的河道砂体,发育厚度大,透水性及连通性好,利于成矿; Ⅰ、Ⅴ岩段发育较好的层间氧化带,在氧化带前锋线附近有不同程度的铀矿化,并且铀矿化以微粒状、短柱状的铀石为主。综合分析铀矿物质来源、砂体、古气候、水文地质等条件,认为中侏罗统延安组具备铀成矿条件,尤其是Ⅰ、Ⅴ岩段氧化-还原过渡带中的灰色砂体具有较大成矿潜力。

Abstract:

Ordos Basin is an important production area of sandstone-type uranium deposits in China. The ore-bearing rocks are mainly sandstones in the lower section of Middle Jurassic Zhiluo Formation. The lower part of Middle Jurassic Yan'an Formation has a low degree of research, and the prospecting results are not significant. A systematic analysis of sedimentary system, sandbodies, interlayer oxidation zones, rock mineralogy and uranium occurrence forms of Middle Jurassic Yan'an Formation was carried out in the northeastern of Ordos Basin. The results show that Yan'an Formation belongs to the river-delta sedimentary system, and can be divided into five rock members of Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ from bottom to top. Among them, Ⅰ and Ⅴ rock members are channel sandbodies deposited by braided river facies and meandering river facies with large thickness, good permeability and connectivity, and are conducive to mineralization; interlayer oxidation zones are well developed in Ⅰ and Ⅴ rock members. Different levels of uranium mineralization exist near the front line of oxidation zone, which is dominated by particulate and short columnar coffinite. Uranium mineral sources, sandbodies, palaeoclimate, hydrogeology and other conditions comprehensively show that Middle Jurassic Yan'an Formation has the uranium metallogenic conditions, especially the gray sandbodies in the redox transition zone of Ⅰ and Ⅴ rock members have large mineralization potential.

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备注/Memo

备注/Memo:

收稿日期:2020-08-09; 修回日期:2020-10-13; 网络首发日期:2020-11-15投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41702211); 中国核工业地质局地勘费项目(201503)
作者简介:李瑞霜(1993-),男,内蒙古包头人,桂林理工大学理学硕士研究生,E-mail:964840035@qq.com。
*通讯作者:刘战庆(1975-),男,陕西蒲城人,副教授,理学博士,博士后,E-mail:lzqgygcx2008@163.com。

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更新日期/Last Update: 2020-12-20