Mineralization Characteristics and Metallogenic Mechanism of Bashibulake Uranium-bearing Asphalt Uranium Deposit
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摘要: 通过实地和显微镜观察、取样、分析测试等方法，取得大量实际资料，着重研究巴什布拉克矿床铀与石油产区含地沥青铀矿床之间等内在联系，利用所取得的大量数据对地沥青及其铀矿化特征和成矿机理予以讨论，认为巴什布拉克与石油密切相关的大型含地沥青铀矿床为一种既有承压水的层间氧化为主、又有潜水氧化，特别与石油热演化、油气破坏产物地沥青和油气还原（H2、CH4）、热液（水）蚀变、碳酸盐水洗、渗漏与扩散等因素有关的复成因类型。石油含铀和多金属，与其氧化为沥青增加对铀吸附性，以及存在还原性气体具有极强的还原铀能力有关，地沥青既具有在酸性介质中发生吸附铀，又能在弱碱性介质中还原铀的能力。Abstract: Based on field investigation and microscopic observations, sampling, analysis and testing, this paper focused on studying the intrinsic relationship between the Bashibulake uranium deposits and the bituminous uranium deposits in oil-producing areas.The mineralization characteristics and metallogenic mechanism of asphalt were discussed by using amounts of data obtained. The authors hold that Bashibulake asphalt uranium deposit, related to petroleum,is a complex type with both the interlayer oxidation of confined water and the phreatic oxidation. The process is especially connected with thermal evolution of petroleum, asphalt from oil-gas damage, oil-gas reduction(H2, CH4), hydrothermal (water) alteration, and carbonate washing, leaking and diffusing, etc. Petroleum contains uranium and polymetals,which are related to the increasing adsorption of uranium for its oxidation to asphalt and strong capability of the reducing gas to reduce uranium. Asphalt adsorbs uranium in acidic media, and also reduces uranium in weak alkaline medium.
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