投稿时间：2015-12-01
修订日期：2016-03-27
网络发布日期：2017-03-11
中文摘要:二连盆地为中国北方重要的聚煤沉积盆地，同时也发育赛汉组古河谷，古河谷在盆地内呈北东向带状展布，河谷内发育巴彦乌拉、赛汉高毕及哈达图等多个铀矿床。铀矿床具有"同河谷多矿床、同河谷多类型"的特点。作者通过对含铀古河谷构造-建造的研究，将赛汉组古河谷与铀成矿有关的构造演化划分为6个阶段。沉积前断陷期构造形成了古河谷建造沉积的带状谷地；断坳转换期湖相沉积的灰色泥岩，为铀成矿间接提供了还原物质；坳陷期沼泽化沉积，为铀成矿提供了直接还原介质；赛汉组上段热-重力沉降期河流、辫状河三角洲沉积，形成主要的铀储层。挤压隆升剥蚀期，受构造掀斜抬升，影响了成矿作用的类型及规模；成矿后期的热沉降期，导致新一轮的沉积充填，起到保矿的作用。通过对赛汉组沉积体系、砂分散体系等特征的研究，发现下白垩统赛汉组下段沿短轴方向主要发育冲积扇-扇三角洲-湖沼沉积体系，长轴方向发育辫状河三角洲-湖沼沉积体系。赛汉组上段主要发育河流沉积体系，砂体较发育，沿古河谷呈朵状、带状分布，矿床主要产于赛汉组上段古河谷砂体内。建立了赛汉组古河谷内典型矿床的矿床成矿模式，将赛汉组古河谷的矿床成矿模式划分为巴彦乌拉潜水-层间氧化式、赛汉高毕潜水氧化式及哈达图层间氧化式。
Abstract:Erlian Basin is an important coal accumulating basin in North China and also has well developed Saihan paleo-valley. The paleo-valley is in NE-striking banded extension. Quite a few mineral deposits, such as Bayawula, saihangaobi and Hadatu uranium ore deposits are developed in the paleo-valley. The uranium deposits are characterized by multiple deposits in the same paleo-valley and multi-types in the same paleo-valley. Based on a study of the structure and the formation of the Saihan paleo-valley, the authors divided the tectonic evolution of the Saihan paleo-valley into 6 stages. The faulted depression stage formed the banded valley for deposition. The gray mudstones of lacustrine sediments in the fault-sag transition stage provided indirectly a reduction material for uranium mineralization. The swamp sediments in the depression stage provided directly a reduction material for uranium mineralization, whereas the river and braid delta deposits of the thermal subsidence formed the major uranium reservoirs. During the stage of uplift and erosion, the tectonic uplift influenced the type and scale of the mineralization. The thermal subsidence of the late mineralization resulted in a new round of sedimentary deposition, thus playing a protection role. A study of the uranium depositional system and sand distribution system shows that the lower member of Saihan formation mainly has developed alluvial fan-fan delta lacustrine depositional system in the short axis direction and braided fluvial delta -lacustrine depositional system in the long axis direction, whereas the upper member of Saihan formation has mainly developed fluvial depositional system, with sand body developed along the paleo-valley in flower shape and banded distribution. The uranium ore deposits were mainly formed in Saihan paleo-valley. The authors established the metallogenic model of the typical ore deposits in the Saihan paleo-valley and classified the metallogenic model into Bayanwula phreatic-interlayer oxidation type, Saihan Gaobi phreatic oxidation type and Hadatu interlayer oxidation type.
keywords:geology Saihan paleo-valley structure and formation metallogenic model uranium ore deposit eastern part of the Erlian Basin
文章编号：
中图分类号：P619.14
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基金项目:本文为中国地质调查局地质调查项目整装勘查区基础地质研究（编号：12120114076601）、内蒙古二连盆地中西部铀矿资源远景调查（编号：DD2016013607）和中国核工业地质局二连盆地铀矿调查与勘查项目（编号：201702）联合资助成果
引用文本：
刘波,杨建新,彭云彪,康世虎,乔鹏,鲁超,张锋.2017.二连盆地中东部含铀古河谷构造建造及典型矿床成矿模式研究[J].矿床地质,36(1):126~142LIU Bo,YANG JianXin,PENG YunBiao,KANG ShiHu,QIAO Peng,LU Chao,ZHANG Feng.2017.Study of structure and formation in uranium-bearing paleo-valley and typical metallogenic models in eastern part of Erlian Basin[J].Mineral Deposits36(1):126~142
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