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二连盆地西缘隆起区卫境岩体抬升剥蚀与盆内铀成矿耦合机理研究

项目来源

国家自然科学基金(NSFC)

项目主持人

聂逢君

项目受资助机构

东华理工大学

项目编号

41772068

立项年度

2017

立项时间

未公开

研究期限

未知 / 未知

项目级别

国家级

受资助金额

75.00万元

学科

地球科学-地质学-矿床学

学科代码

D-D02-D0205

基金类别

面上项目

关键词

抬升剥蚀 ; 二连盆地 ; 卫境岩体 ; 铀成矿作用 ; 盆山耦合 ; Uplifting and exhumation ; Basin and mountain coupling ; Uranium mineralization ; Weijing granite ; Erlian basin

参与者

姜美珠；严兆彬；张成勇；张鑫；蒋乐；于雅岑；胡永蓁

参与机构

东华理工大学

项目标书摘要：本项目契合了盆缘构造演化对盆内铀成矿影响的关键科学问题开展盆地铀矿床综合研究，该研究成果将对正在二连盆地进行的铀矿勘查和铀成矿理论的创新具有重要意义。本项目以前期研究提出的二连盆地“同盆多类型”铀矿成果为基础，以西缘卫境岩体和盆内乌兰察布坳陷为主要研究区，以构造控岩、控矿为主线，运用高精尖技术—ZFT/AFT、SIMS-ISD、SHRIMP/La-ICPMS-U/Pb、(U-Th)/He,结合传统技术—EMP、SEM、ICP-MS、地层回剥、显微镜等，系统研究卫境岩体特征与物源、铀源，盆内铀矿化时空分布规律，恢复盆地西缘隆起区抬升剥露事件与盆内沉降—沉积历史，确定构造隆升剥露、赋矿沉积体与铀矿化的耦合关系，并在控矿因素研究基础上，建立盆内不同类型铀矿化的成矿模型，探索北方盆地铀成矿研究新方法、新理论，为在类似盆地中找寻铀矿进行立典研究，为北方乃至东北亚盆地铀资源潜力预测提供可靠的理论支撑。

Application Abstract: Study on the mechanism of coupling of Exhumation of the Weijing granite of western Erlian basin uplift and basin Interior uranium mineralization catches the key problem of response of basin uranium mineralization to marginal tectonic evolution.The achievements from this study will be of great importance to ongoing uranium exploration in Erlian basin and uranium mineralization fundamental theory.Based upon the previous achievements for“basin multi-uranium deposits”and taking tectonic evolution as main research clue,we choose western marginal Weijing granite and Wulanchabu subbasin as major study area.Combining modern advanced tools--ZFT/AFT,SIMS-ISD,U/Pb dating of SHRIMP/La-ICP-MS,and(U-Th)/He with traditional methods—EMP,SEM,ICP-MS,stratigraphical back-stripping and microscope,we systematically study characteristics of Weijing granite,sediment and uranium sources,temporal-spacial distribution within the basin and restore the exhumation of western marginal uplift and subsidence-sedimentation history.The coupling of exhumation and ore-bearing depositional bodies with uranium mineralization,and different type of mineralization models for uranium deposits will be established.The new method and theory created from this study will play a key role in typical uranium deposit and potential resource prediction for the north China and northeastern Asia.

项目受资助省

江西省

项目结题报告(全文)

二连盆地是中国北方砂岩型铀矿的重要基地，盆地西缘隆升与盆地伸展下沉耦合研究对铀成矿作用及进一步找矿有重要的现实意义。本次研究与核工业208大队的合作，通过资料收集，野外地质调查，在盆地的西缘、中部苏尼特隆起区和卫境岩体地区进行了露头剖面观察30余条，采取了所需要的样品30件；钻孔岩心观察70口井，取样129件；测试分析AFT样品11件,Pb同位素17件，锆石U-Pb年龄12件,Sr同位素10件，薄片鉴定82片，探针打点120点。AFT模拟表明，卫境岩体的磷灰石裂变径迹年龄介于76.7~53.8 Ma之间，晚白垩世经历了一次快速的剥露事件，剥露速率约为0.1~0.2mm/a。卫境岩体晚白垩世的构造热事件对应于其周边早白垩世断陷盆地内(如二连盆地、海拉尔盆地等)下白垩统和上白垩统之间的角度不整合，该不整合代表了一次构造反转事件，该事件与Izanagi板块快速向东亚之下快速俯冲有重要关系。盆地含矿目的层沉积相与微相研究证实，下白垩统腾格尔组(K1bt)目的层沉积于扇三角洲与湖相环境，赛汉组(K1bs)沉积环境主要为辫状河、曲流河、湖沼、小型冲积扇等环境，而控制砂岩型铀矿化的是辫状河、曲流河心滩和边滩。二连组目的层主要沉积于干旱盐湖环境。铀成矿作用研究得出，盆地中铀矿化有四种类型：含煤泥(砂)岩型(道尔苏式)、侧向层间氧化型(巴彦乌拉式)、垂向氧化型(赛汉高毕式)、湖相泥(砂)岩型(努和廷式)铀矿。盆地中砂岩型铀矿的铀矿化U源来自西边的卫境岩体，因为岩体古铀含量U0平均为15.17ppm,平均求丢失率45.47%,而且卫境岩体地表风化剥蚀强烈，目前达到准平原化程度。砂岩型铀矿是我国目前铀矿勘查中的主要类型，其形成条件和控矿因素研究对扩大找矿有重要影响。本研究从控制砂岩型铀矿形成的三个主要因素——构造抬升、沉积体系和铀源来研究卫境岩体二连盆地耦合对铀成矿的影响，所建立的成矿模型不但丰富了铀成矿的理，同时对进一步找矿有重要的指导作用。

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  • 1.Genetic models and exploration implication of the paleochannel sandstone-type uranium deposits in the Erlian Basin, North China - A review and comparative study

    • 关键词：
    • Paleochannel; Sandstone-type deposits; Uranium- and oxygen-bearingfluid; Exploration; Uranium potential; Erlian Basin; North China;LEAD-ISOTOPE SYSTEMATICS; INNER-MONGOLIA; GRANITE MOUNTAINS;MINERALIZATION; COLLISION; BASALTS; COAL

    Since the Bayanwula uranium deposit was discovered, several paleochannel sandstone-type uranium deposits have been found in the Manite and Wulanchabu sub-basins of the Erlian Basin. The paleochannel sandstone-type uranium deposits in the Erlian Basin represent important uranium sources in North China. The regional geological settings, depositional facies and sequences, ore-bearing sand bodies and uranium source rocks (e.g., granite and sandstones), play important roles in the formation of these deposits. Three styles of paleochannel sandstone-type uranium deposits occur in the Erlian Basin: 1) interlayer oxidation-style deposit hosted in the braided river sand bodies of the Saihan Formation and characterized by laterally zoned mineralization; 2) phreatic oxidation-style deposits hosted in meandering river sand bodies of the Saihan Formation, showing vertically zoned oxidized mineralization; 3) superimposed mineralization-style deposits hosted in braided river sand bodies of the Saihan Formation, characterized by an oxidized zone from fluvial channel center to margin, which was then overprinted by hydrothermal fluids. These three styles of the uranium deposits depend on depositional microfacies and development of deep-seated faults, which can be used to locate the mineralization and exploration targets within the Erlian Basin.

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