户撒盆地芒棒组第二段古气候特征及其对铀成矿作用的影响  

Paleoclimate Characteristics of the Second Layer of Mangbang Formation in Husa Basin and Its Influence on Uranium Mineralization

作　　者：张建军 牟传龙 刘成东 夏彧 伍皓 陈婷 吴波 ZHANG Jian-jun;MOU Chuan-long;LIU Cheng-dong;XIA Yu;WU Hao;CHEN Ting;WU Bo(Institute of Geological Survey,East China University of Technology,Nanchang 330013,China;Chengdu Geological Survey Center,Chengdu 610081,China;School of Water Resources&Environmental Engineering,East China University of Technology,Nanchang 330013,China;131 Coalfield Geology Co.,Ltd.,Xi an 715499,China)

机构地区：[1]东华理工大学地质调查研究院,南昌330013 [2]成都地质调查中心,成都610081 [3]东华理工大学水资源与环境工程学院,南昌330013 [4]陕西省一三一煤田地质有限公司,西安715499

出　　处：《科学技术与工程》2023年第32期13701-13709,共9页Science Technology and Engineering

基　　金：中国博士后科研基金(2019M653840XB);东华理工大学博士科研启动基金(DHBK2019067);中国地质调查局项目(DD20160133)。

摘　　要：滇西地区是中国重要的砂岩型铀矿带之一。近年,随着铀矿勘察工作的持续推进,先后发现了一系列新的铀矿化点和铀矿床。为了探讨沉积期古气候特征与砂岩型铀矿成矿关系,对户撒盆地芒棒组第二段碎屑岩运用主量元素、微量元素分析方法研究了沉积期古盐度、古气候及古氧化还原条件。结果表明:户撒盆地芒棒组第二段为温暖潮湿环境下的淡水沉积;沉积水体总体为还原环境,部分过渡为氧化-还原环境。沉积水体环境是制约铀成矿的关键因素之一,沉积水体由还原环境逐渐过渡为氧化-还原环境是砂岩型铀矿的有利成矿层位。One of the most noteworthy sandstone uranium assets within China is located in western Yunnan.Numerous fresh uranium mineralization sites and uranium deposits have been identified as a result of the steady expansion of uranium exploration in recent years.To investigate the relationship between paleoclimate characteristics in the sedimentary period and sandstone-type uranium mine-ralization,the paleosalinity,paleoclimate,and paleoredox conditions of the second layer of the Mangbang Formation in the Husa Basin were analyzed with the major and trace elements.Results show that the second layer of the Mangbang Formation in the Husa Basin is a freshwater deposit that is formed in a warm,humid environment.The sedimentary water system is typically in a reducing environment,though some of it could have migrated to an oxidation-reduction environment.The sedimentary water environment,particularly the gradual transition,is one of the primary factors limiting uranium mineralization.

关 键 词：滇西 户撒盆地 古气候 砂岩型铀矿 

分 类 号：P595[天文地球—地球化学]