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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02期

页码:

199-214

栏目:

基础地质与矿产地质

出版日期:

2020-03-15

文章信息/Info

Title:

Metallogenic Conditions, Characteristics and Genesis of Sandstone-type Uranium Deposit of the Lower Member of Yimin Formation in Kelulun Sag of Inner Mongolia, China

文章编号:

1672-6561(2020)02-0195-16

作者:

黄少华¹; 2; 秦明宽¹; 2*; 周文博³; 刘章月¹; 2; 刘彤³; 赵志伟³; 东艳¹; 2

(1. 核工业北京地质研究院,北京 100029; 2. 中核集团铀资源勘查与评价技术重点实验室,北京 100029; 3. 核工业二四三大队,内蒙古 赤峰 024000)

Author(s):

HUANG Shao-hua¹; 2;  QIN Ming-kuan¹; 2*;  ZHOU Wen-bo³;  LIU Zhang-yue¹; 2;  LIU Tong³;  ZHAO Zhi-wei³;  DONG Yan¹; 2

(1. Beijing Research Institute of Uranium Geology, Beijing 100029, China; 2. CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing 100029, China; 3. No.243 Geological Party, CNNC, Chifeng 024000, Inner Mongolia, China)

关键词:

砂岩型铀矿;  伊敏组;  控矿条件;  矿化特征;  成矿年龄;  古潜水氧化;  成矿模式;  内蒙古

Keywords:

sandstone-type uranium deposit;  Yimin Formation;  ore-controlling condition;  mineralization characteristic;  metallogenic age;  paleophreatic oxidation;  metallogenic model;  Inner Mongolia

分类号:

P619.14

DOI:

10.19814/j.jese.2019.12013

文献标志码:

A

摘要:

为查明内蒙古克鲁伦凹陷伊敏组下段砂岩铀成矿规律和成因,系统总结了内外部铀源、构造环境、岩性-岩相特征、后生氧化作用等关键控矿条件以及铀成矿特征,较精准厘定了目的层时代及其铀成矿年龄,进而构建了砂岩铀成矿模式。结果表明: 克鲁伦凹陷的主攻找矿目的层为伊敏组下段,侏罗纪中酸性火山岩、海西期花岗岩、下白垩统伊敏组和地下水的U含量高,指示了内外部铀源十分丰富; 目的层形成于断-坳转换期,发育扇三角洲相—滨浅湖相沉积体系,(水下)分流河道微相灰色砂体发育,岩性以含砾粗砂岩、砂砾岩为主,结构疏松,透水性好; 原生砂体中富含碳屑及植物茎干,自身还原容量较高,是一套良好的含矿建造; 该砂体普遍发育强烈的褐黄色面状古潜水(局部古潜水-层间)后生氧化作用,进而控制了矿体的形成和形态; 矿体埋深一般小于150 m,每平方米U质量为0.46～1.00 kg,主要呈透镜状和似层状; 铀矿化砂岩全岩U-Pb定年获得了(67.1±5.9)Ma和(63.7±5.2)Ma的等时线成矿年龄; 结合凹陷构造演化史,建立了伊敏组下段4个阶段的古潜水-层间氧化铀成矿模式,即早白垩世早期成矿前富铀建造准备阶段、早白垩世中晚期含矿目的层形成阶段、古近纪主成矿阶段和新近纪成矿停滞保存阶段,并指出区内深部(500 m以浅)仍具有较好的古潜水-层间氧化带型铀矿成矿潜力。

Abstract:

In order to investigate the metallogenic genesis and potential of sandstone-type uranium deposit of the lower member of Yimin Formation in Kelulun sag of Inner Mongolia, the key ore-controlling conditions, such as inner and external uranium sources, tectonic setting, characteristics of lithology-lithofacies, epigenetic oxidation, and characteristics of uranium mineralization, were summarized. Moreover, the ages of uranium mineralization and target strata were determined, which can be used to build a reasonable sandstone-type uranium metallogenic model. The results show that the main exploration target in Kelulun sag is the lower member of Yimin Formation; meanwhile, the uranium contents of Jurassic intermediate-acid volcanic rocks, Hercynian granitoids, Lower Cretaceous Yimin Formation and groundwater are relatively high, indicating that inner and external uranium sources are abundant in the area; the target strata mainly develop fan delta-shore shallow lake sedimentary system during the fault-depression transition period, and are characterized by(underwater)distributary channel grey sand bodies; the lithology is mainly composed of gravel-bearing coarse sandstone and glutenite with loose structure and well permeability; the primary sandstone has a high reduction capacity owing to abundant charcoal and plant stems, which is a good ore-bearing construction; the sand bodies generally develop strong brownish yellow planar paleophreatic epigenetic oxidation with paleophreatic-interlayer oxidation locally, which significantly control the formation and shape of the orebodies; correspondingly, the discovered orebodies with a burial depth of less than 150 m and a uranium content of 0.46-1.00 kg·m^-2, mainly have lenticular and stratoid shapes; furthermore, the isochron metallogenic ages of(67.1+5.9)Ma and(63.7+5.2)Ma are obtained by whole-rock U-Pb isotope dating with different grades of uranium-mineralized sandstones; finally, a four-stage paleophreatic-interlayer oxidation uranium metallogenic model is established based on tectonic evolution history, including preparatory stage of uranium-rich formation in early Early Cretaceous, development stage of ore-bearing target strata in middle-late Early Cretaceous, main metallogenic stage in Paleogene, and metallogenic cessation and preservation stage in Neogene. In general, there is a favorable potential for the formation of paleophreatic-interlayer oxidation zone type of sandstone uranium deposit in the deep part(<500 m)of the study area.

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备注/Memo

备注/Memo:

收稿日期:2019-12-10; 修回日期:2020-01-30; 网络首发日期:2020-03-19投稿网址:http:∥jese.chd.edu.cn/
基金项目:核工业地质局地勘科研项目(地D1804); 核工业地质局地勘生产项目(201911); 中核集团启明星项目(QNYC2018-1); 国家自然科学基金项目(41902084)
作者简介:黄少华(1989-),男,江西临川人,核工业北京地质研究院高级工程师,工学博士,E-mail:huangshaohua20@126.com。
*通讯作者:秦明宽(1968-),男,四川巴中人,核工业北京地质研究院研究员级高级工程师,工学博士,E-mail:qinmk9818@163.com。

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更新日期/Last Update: 2020-03-24