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首页> 外文学位 >Development and application of argon-40/argon-39 laser-fusion dating and argon-40/argon-39 step-heating dating of quaternary basaltic volcanic rocks: A comparison of conventional potassium-argon dating and argon-40/argon-39 dating methods.
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Development and application of argon-40/argon-39 laser-fusion dating and argon-40/argon-39 step-heating dating of quaternary basaltic volcanic rocks: A comparison of conventional potassium-argon dating and argon-40/argon-39 dating methods.

机译：第四纪玄武质火山岩氩40 /氩39激光熔融定年和氩40 /氩39阶加热定年的开发与应用：常规钾氩定年与氩40 /氩39定年的比较方法。

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摘要

Results on the development and application of {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} laser-fusion dating and{dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} step-heating methods of Quaternary low potassium basaltic rocks are presented here.; The first chapter contains a brief historical account of radiometric dating, the development of K-Ar and {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} dating, a description of the equipment and methods used in this study, and a tutorial on the {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} dating method. Chapters two, three, and four of this dissertation present the results of a case study comparing the conventional K-Ar method to the more advanced {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} laser-fusion and restance furnace methods and the application of the Paleomagnetic studies on samples from the Lanthrop Wells volcanic center in Southwestern Nevada. The Lathrop Wells volcanic center, the youngest volcano located near Yucca Mountain, Nevada, has significant implications for volcanic hazards to the proposed High-Level Radioactive Waste Repository Site at Yucca Mountain.; {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} step-heating and laser total fusion data age determinations from the Lathorp Wells volcanic center, Nevada indicate an age of 122 {dollar}pm{dollar} 3 ka for the Lathrop Wells volcanic center. This age is consistent with previously determined K-Ar ages. In addition, these results are consistent with the chronology and stratigraphy of the regional Quartenary units and reported surface exposure ages on the Lathrop Wells deposits.; The paleomagnetic data indicate that there are at least two eruptive units at the Lathrop Wells volcanic center, Nevada. The measured directions of remanent magnetization for the two flows are 51.5{dollar}spcirc{dollar} inclination, 2.2{dollar}spcirc{dollar} declination, and 51.5{dollar}spcirc{dollar} inclination, 354.6{dollar}spcirc{dollar} declination. The difference in the paleomagnetic pole directions, 4.7{dollar}spcirc{dollar}, is different at the 99.98 percent confidence level. The discovery of at least two flow units of different age at the Lathrop Wells volcanic center indicates a more complex volcanic history than previously thought. The observed angular difference between the two mean directions suggests a minimum age difference between the eruptive events of at least 100 years. Weighted means radiometric ages on these two units are not significantly different. Based on statistical analyses, the difference in age between the flows is less than or equal to approximately 22.3 ka.; The fifth chapter presents the results of a study of the age of the Cobb Mountain Normal-Polarity Subchron. The main point of the chapter, however, is a comparison of the Geomagnetic Polarity Time Scale with the Astronomical Polarity Time Scale. The new revised age of {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} age of the Cobb Mountain Normal-Polarity Subchron from this study is concordant with the Astronomical Polarity Time Scale, thus validating the use of Milankovitch cycles for estimating the ages of global climatic changes. In addition, a discussion of the need for a Quaternary {dollar}rmsp{lcub}40{rcub}Ar/sp{lcub}39{rcub}Ar{dollar} dating standard is presented and proposes the sanidine from the rhyolite of Alder Creek, California for such a standard. (Abstract shortened by UMI.)
机译：{dol} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}激光融合测年和{dollar} rmsp {lcub} 40 {rcub} Ar /的开发和应用结果本文介绍了第四系低钾玄武岩的sp {lcub} 39 {rcub} Ar {dollar}步进加热方法。第一章简要介绍了放射性测年的历史历史，K-Ar和{dollar} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}测年的发展，本研究中使用的设备和方法，以及有关{dollar} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}约会方法的教程。本论文的第二章，第三章和第四章介绍了一个案例研究的结果，该案例将常规K-Ar方法与更高级的{dol} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar比较内华达州西南部兰思罗普韦尔斯火山中心样品的激光熔融和余热炉方法及其古磁研究的应用。 Lathrop Wells火山中心是内华达州尤卡山附近最年轻的火山，对拟议的尤卡山高放废物处置库地点的火山危害具有重大影响。来自内华达州Lathorp Wells火山中心的{dollar} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}步进加热和激光总融合数据年龄确定表明年龄{122} } pm {dollar}到达Lathrop Wells火山中心3 ka。该年龄与先前确定的K-Ar年龄一致。此外，这些结果与区域第四纪单元的年代学和地层学以及Lathrop Wells矿床的地面暴露年龄相一致。古磁数据表明，在内华达州的拉斯罗普韦尔斯火山中心至少有两个喷发单元。两种流动的剩余磁化强度的测量方向分别为51.5 {dol} spcirc {dollar}倾斜，2.2 {dollar} spcirc {dollar}倾斜和51.5 {dol} spcirc {dollar}倾斜，354.6 {dollar} spcirc {dollar}磁偏角。在古磁极方向上的差异4.7spdol {dol}在99.98％的置信度上是不同的。在Lathrop Wells火山中心发现了至少两个不同年龄的流动单元，这表明火山历史比以前认为的更为复杂。在两个平均方向之间观察到的角度差异表明，爆发事件之间的最小年龄差异至少为100年。加权意味着这两个单位的辐射年龄没有显着差异。根据统计分析，流动之间的年龄差异小于或等于大约22.3 ka。第五章介绍了对科布山正反两极子年代的研究结果。但是，本章的重点是将地磁极性时标与天文极性时标进行比较。来自这项研究的Cobb山正极性次同步世代{dollar} rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}的新修订年龄与天文学极性时标一致，因此验证了使用Milankovitch循环估算全球气候变化的年龄。此外，还讨论了对四元rmsp {lcub} 40 {rcub} Ar / sp {lcub} 39 {rcub} Ar {dollar}约会标准的必要性的讨论，并提出了Alder Creek流纹岩中的尿苷，加州为此标准。 （摘要由UMI缩短。）

著录项

  • 作者

    Turrin, Brent David.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Geochemistry.; Geology.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 152 p.
  • 总页数 152
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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