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伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据

丁波 刘红旭 李平 蒋宏 张虎军 张宾

丁波, 刘红旭, 李平, 等, 2019. 伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据. 地质力学学报, 25 (S1): 84-89. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.015
引用本文: 丁波, 刘红旭, 李平, 等, 2019. 伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据. 地质力学学报, 25 (S1): 84-89. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.015
DING Bo, LIU Hongxu, LI Ping, et al., 2019. THE TECTONIC ACTIVITY IN THE SOUTHERN MARGIN OF THE ILI BASIN AND ITS CONSTRAINT ON SANDSTONE-TYPE URANIUM DEPOSITS: EVIDENCE FROM APATITE FISSION TRACK AND U-PB DATING. Journal of Geomechanics, 25 (S1): 84-89. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.015
Citation: DING Bo, LIU Hongxu, LI Ping, et al., 2019. THE TECTONIC ACTIVITY IN THE SOUTHERN MARGIN OF THE ILI BASIN AND ITS CONSTRAINT ON SANDSTONE-TYPE URANIUM DEPOSITS: EVIDENCE FROM APATITE FISSION TRACK AND U-PB DATING. Journal of Geomechanics, 25 (S1): 84-89. DOI: 10.12090/j.issn.1006-6616.2019.25.S1.015

伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据

doi: 10.12090/j.issn.1006-6616.2019.25.S1.015
基金项目: 

国家科技部973计划项目 2015CB453004

中核集团集中研发项目"伊犁盆地南缘东段砂岩型铀矿定位预测与靶区优选 地LTD1612-4

国防预研项目 3210402

详细信息
    作者简介:

    丁波(1991-), 男, 助理工程师, 研究方向:矿产普查与勘探。E-mail:18773485100@163.com

    通讯作者:

    刘红旭(1977-), 男, 研究员, 主要从事砂岩型轴矿成矿作用、成矿规律以及成矿预测等方面的研究工作。E-mail:lhx100029@163.com

  • 中图分类号: P619.14

THE TECTONIC ACTIVITY IN THE SOUTHERN MARGIN OF THE ILI BASIN AND ITS CONSTRAINT ON SANDSTONE-TYPE URANIUM DEPOSITS: EVIDENCE FROM APATITE FISSION TRACK AND U-PB DATING

  • 摘要: 为了探讨伊犁盆地南缘构造活动与铀成矿关系,通过采取砂岩型铀矿含矿层砂岩样品,利用磷灰石裂变径迹热年代学与U-Pb等时线定年的方法,对伊犁盆地南缘构造活动与砂岩型铀矿成矿年龄进行了研究。研究结果表明:①伊犁盆地南缘自中生代以来经历了三期强烈的隆升—剥蚀事件,三叠纪末—中侏罗世、晚侏罗世—早白垩世、中新世—现今,对应印支末期、燕山期与喜马拉雅期三期构造活动;②盆地南缘中—西段砂岩型铀矿成矿年龄可分为158~153 Ma、108~60.5 Ma、55~15 Ma,12~0.3 Ma四期,盆地东段铀成矿年龄比较新,为7.8~5.5 Ma之间;③盆地南缘构造活动时间与铀成矿年龄具有非常好的对应性,将伊犁盆地南缘铀成矿作用过程划分为三个阶段,物源区快速抬升—含矿建造形成期及铀的预富集阶段、主成矿阶段、后生叠加改造阶段。

     

  • 图  1  伊犁盆地南缘铀矿地质图简图[8]

    1—第四系松散堆积物;2—新近系上新统独山子组褐色砂质泥岩;3—中—下侏罗统水西沟群灰色砂砾岩、含砾粗砂岩;4—中—上三叠统小泉沟群灰色、杂色砂砾岩及泥岩;5—上二叠统晓山萨依组灰岩夹砂砾岩;6—下二叠统中—酸性火山岩;7—下石炭统深灰色碳酸盐;8—上石炭统中—酸性火山岩;9—石炭纪—二叠纪花岗岩;10—海西晚期侵入辉长岩;11—整合地质界线;12—角度不整合地质界线;13—平行不整合地质界线;14—区域性大断裂;15—一般断裂;16—逆冲断裂;17—推测逆冲断裂;18—逆断层;19—推测断层;20—盆地边界;21—国界线;22—铀矿床

    Figure  1.  A brief geological map of uranium deposits in the southern margin of the Ili basin[8]

    图  2  伊犁盆地南缘砂岩型铀矿含矿层柱状图[8]

    Figure  2.  The column-map of sandstone-type uranium deposits in the southern margin area of the Ili basin[8]

    图  3  伊犁盆地南缘砂岩型铀矿含矿层磷灰石裂变径迹反演结果

    Figure  3.  The apatite fission track inversion results of sandstone-type uranium deposit in the southern margin of the Ili basin

    表  1  伊犁盆地南缘东段砂岩型铀矿含矿层砂岩中磷灰石裂变径迹分析数据一览表

    Table  1.   The table of apatite fission track analysis data in ore-bearing sandstone of sandstone-type uranium deposits in the southern margin area of the Ili basin

    样品编号 取样位置 层位 岩性 颗粒数(n) ρd(Nd)/×106 cm-2 ρs(Ns) /×105 cm-2 ρi(Ni)/×106 cm-2 U/×10-6 P2) /% 平均年龄/Ma(±1σ) 径迹平均长度(N)/μm
    Apf-30 苏阿苏沟 J1-2sh 灰白色细砂岩 27 1.013(2534) 0.435(84) 7.009(13527) 86.5 80.3 1.1±0.1 12.63±0.25(56)
    Apf-31 苏阿苏沟 J1-2sh 灰白色粗砂岩 24 1.003(2508) 5.243(1088) 0.861(1787) 10.7 0.3 117.7±7.1 11.77±0.15
    Apf-33 达拉地 J1-2sh 黄色粗粒砂 25 0.982(2456) 7.420(1087) 0.915(1341) 11.7 28.9 139.0±7.5 12.39±0.14
    注:测试在中科院高能物理研究所完成;当P(χ2)>5%时,取池年龄进行年龄数据解释;P(χ2) < 5%时,取平均年龄进行年龄数据解释。
    下载: 导出CSV

    表  2  伊犁盆地南缘典型砂岩型铀矿床铀成矿年代表

    Table  2.   Metallogenic ages of sandstone-type uranium deposits in the southern margin area of the Ili basin/Ma

    矿床名称 J3 K E1 E2 E3 N1 N2 Q1-3 Q4 数据来源
    洪海沟 0.6 刘红旭等[2]
    库捷尔太(512) 108~69 51~25 19、12~3 2~0.7 秦明宽[12];夏毓亮等[13];夏毓亮等[13]
    乌库尔其(513) 12~2 刘红旭等[2]
    扎吉斯坦(511) 60.5~30、25~15、12~0.3 夏毓亮等[13]
    蒙其古尔(510) 158~153 82 55 28.3~12.1、9.2~5.1、3.8~2.6 刘红旭等[2]
    达拉地(509) 7.8~5.5 朱杰辰[11];夏毓亮等[13];夏毓亮等[13]
    下载: 导出CSV
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