Characterization of U(-V) Deposits in the La Sal District, UT and CO and Their Relationship to Paradox Basin Fluid Flow

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Eytan Bos Orent, Mark D. Barton, Isabel F. Barton
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Abstract

This paper synthesizes new and previous work on the tabular sandstone-hosted uranium and vanadium deposits of the La Sal district, one of the principal U-V districts of the Colorado Plateau. Deposits form a 1–3 km wide, E-W trending 30 km long trend spanning the Utah-Colorado border, approximately orthogonal to the Uravan belt. Ore is hosted in the uppermost fluvial subarkosic sandstones of the Salt Wash Member of the Jurassic Morrison Formation and typically forms channel-parallel, elongate orebodies up to 180 m long, 90 m wide, and 1 m thick. Sandstones are interbedded with silty, muddy, and calcareous units. Principal mineralogical changes include quartz overgrowths accompanied by destruction of early diagenetic hematite. Precipitation of compositionally distinct carbonate cements and clays followed. Bleaching was prior to and/or contemporaneous with mineralization, which is restricted to bleached rocks. Petrography shows that ore minerals (uraninite, coffinite, and montroseite) in part predate growth of authigenic quartz and calcite cements, followed by the formation of ferroan dolomites. Abundant V-rich phyllosilicates may reflect back-reaction of montroseite with quartz and other minerals. New U-Pb dating of ore-hosting calcite (~144 Ma) and K-Ar dating of V-clays (~42–36 Ma) parallel published results for elsewhere on the Plateau. Sedimentary structures (e.g., crossbedding), primary porosity, and the distribution of lithofacies in the local Salt Wash channel system control mineral growth. The thin section- to district-scale observations suggest that mineralization formed either by mixing of two fluids, or alternatively by reaction of oxidized fluids with a reductant earlier introduced during bleaching, as has been suggested in other Plateau deposits.

Abstract Image

犹他州和科罗拉多州拉萨尔地区铀(-V)矿床的特征及其与天堂盆地流体流动的关系
本文综述了对科罗拉多高原主要铀钒矿区之一的拉萨尔矿区表状砂岩型铀钒矿床的新研究成果和以往研究成果。矿床形成一个 1-3 公里宽、东西走向、长 30 公里的趋势,横跨犹他州和科罗拉多州边界,大约与乌拉万带呈正交。矿石赋存于侏罗纪莫里森地层盐冲洗组(Salt Wash Member of the Jurassic Morrison Formation)最上层的亚泥卡岩砂岩中,通常形成与河道平行的细长矿体,长达 180 米,宽 90 米,厚 1 米。砂岩与淤泥质、泥质和钙质单元互层。主要的矿物学变化包括石英的过度生长,以及早期成岩赤铁矿的破坏。随后沉淀出成分独特的碳酸盐胶结物和粘土。漂白是在成矿之前和/或同时发生的,而成矿仅限于漂白岩。岩相学显示,矿石矿物(铀矿石、咖啡岩和蒙脱石)在一定程度上早于自生石英和方解石胶结物的生长,随后形成了铁质白云岩。丰富的富钒基硅酸盐可能反映了蒙脱石与石英和其他矿物的反作用。矿床方解石新的 U-Pb 测定年代(约 144 Ma)和 V 型粘土的 K-Ar 测定年代(约 42-36 Ma)与高原其他地区已公布的结果相一致。沉积结构(如交错层理)、原生孔隙度以及当地盐河河道系统中岩性的分布控制着矿物的生长。从薄片到地区尺度的观察结果表明,矿化要么是由两种流体混合形成的,要么是由氧化流体与漂白过程中较早引入的还原剂反应形成的,其他高原矿床也是如此。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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