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A Radioelement Analysis of the Northern Black Hills, South Dakota, U.S.A

机译：美国南达科他州北部黑山的放射性元素分析

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摘要

The uranium, thorium, and potassium contents from 736 samples, within a 15-km radius of the Homestake Gold Mine and Sanford Underground Research Facility in the Northern Black Hills indicate the geoneutrino background may be higher than average for the continental crust. The radioactive element contents of igneous, metamorphic, and sedimentary rocks were determined by gamma ray spectrometry. Many rocks show hydrothermal and metamorphic alteration within the last ten Ma of the Tertiary period. Young alkali rich igneous rocks, such as rhyolite, phonolite and other volcanic rocks, have lower than average Th:U ratios. The radioelement content of 215 igneous rocks were determined. The radioelement contents of 143 metamorphic rocks were determined. This study also shows that metamorphic rocks were found to have low variable U:Th content when compared to content in igneous rocks. Sedimentary rocks, in general, have low U, Th, and K content. The radioelement content of 236 sedimentary rocks were determined.;Rocks present within the Homestake Gold Mine, are highly altered by hydrothermal and metamorphic activity, enriching U, and in some areas, Th content. The Homestake Gold Mine lies almost entirely within metamorphic rocks. Igneous rocks occur in the mine as veins and dikes. The dominant igneous rock present is rhyolite. Metamorphic rocks present inside the HGM, were divided by formation; Ellison Fm, Poorman Fm, Yates Unit [lower Poorman Fm], Homestake Fm, and Flagrock Fm. The finding of high radioelement content in the rocks suggests that the antineutrinos background at the HGM will need to be considered and calibrated for, in future experiments conducted at the Sanford Underground Research Facility. A geoneutrino luminosity of 1.26x105 (mg--1s --1) was calculated from the samples analyzed within the Homestake Gold Mine. A total geoneutrino luminosity of 4.44x105 (mg --1s=1) was calculated from the sum of all analyses conducted in the Northern Black Hills.
机译：在北部黑山的霍姆斯特克金矿和桑福德地下研究设施的15公里半径内，从736个样品中获得的铀，th和钾含量表明，中微子的背景可能高于大陆壳的平均水平。用伽马射线能谱法测定了火成岩，变质岩和沉积岩中的放射性元素含量。在第三纪的最后10 Ma内，许多岩石表现出热液和变质作用。年轻的富含碱的火成岩，例如流纹岩，方沸石和其他火山岩，其Th：U比值均低于平均水平。测定了215个火成岩的放射性元素含量。确定了143个变质岩中的放射性元素含量。这项研究还表明，与火成岩相比，变质岩的U：Th含量低。通常，沉积岩的U，Th和K含量较低。确定了236个沉积岩中的放射性元素含量。霍姆斯特克金矿中存在的岩石由于热液和变质活动而发生了很大的变化，从而富集了U，在某些地区还富集了Th。霍姆斯特克金矿几乎全部位于变质岩中。火成岩以脉和堤坝的形式出现在矿井中。存在的主要火成岩是流纹岩。 HGM内部存在的变质岩按地层划分。 Ellison Fm，Poorman Fm，Yates Unit [lower Poorman Fm]，Homestake Fm和Flagrock Fm。岩石中高放射性元素含量的发现表明，在Sanford地下研究设施进行的未来实验中，HGM的抗中微子背景将需要加以考虑和校准。根据霍姆斯特克金矿中分析的样品计算得出的中微子光度为1.26x105（mg--1s -1）。根据在北布莱克希尔斯进行的所有分析的总和计算得出总的中微子光度为4.44x105（mg --1s = 1）。

著录项

  • 作者

    Young, Dylan Wade.;

  • 作者单位

    The University of North Dakota.;

  • 授予单位 The University of North Dakota.;
  • 学科 Geophysics.;Geology.
  • 学位 M.S.
  • 年度 2017
  • 页码 240 p.
  • 总页数 240
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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