Fold Dating in the Central Appalachian Valley-and-Ridge.

中部阿巴拉契亚山谷和山脊的折叠约会。

• 批准号: 1629805
• 负责人: Ben van der Pluijm
• 金额: $ 14.76万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1629805&HistoricalAwards=false
• 关键词: Fold; Dating; Central; Appalachian; Valley

Folded rocks are common, highly aesthetic features of mountain belts and their ages constrain the timing of mountain building events, regional patterns of deformation, continental evolution and (economic) mineralization of the Earth?s crust. This geochronological study will improve and test a novel fold dating method based on the dating of illite clays, determine timing of folding in the central Appalachian Mountains of the eastern United States, and demonstrate the method?s potential for other locations around the world. In addition to the scientific goals of the project, it is providing support for the research of a doctoral scientist and is providing research experiences for undergraduate students, thus contributing to educational work force development in an important STEM (science, technology, engineering and mathematics) discipline. In addition, the principal investigators research and educational outreach will be broadly distributed through professional publications and by presentations at professional meetings and public presentations. The research will also be feature in an online textbook, and will be used in class and field experiences for undergraduate students. Illite dating also has direct application for industry and societal resource needs, as fossil fuel and mineral industries typically involve the same geologic setting and conditions that are examined in this study.The Principal investigators have recently developed a method for fold dating using argon geochronology of neocrystallized illite and tested its application in a case study of the Mexican Fold-Thrust Belt. The method relies on the quantification of illite in grain-size fractions of a single sample, and their respective ages; extrapolation of dated grain size fractions determines the ages of deformation and their errors. The Appalachian Valley-and-Ridge project has two primary goals: (1) improve the illite dating method by developing better clay quantification approaches that also reduce error estimates; (2) determine fold ages in the well-known central Appalachians, where forward fold progression has been hypothesized; currently, fold ages are stratigraphically bracketed as Upper Paleozoic; (3) directly constrain the timing of regional paleomagnetic remagnetization, mineralization and economic deposits in the eastern United States.

褶皱岩石是常见的，高度美学特征的山区地带和他们的年龄限制的时间造山活动，区域模式的变形，大陆演化和（经济）矿化的地球？的外壳。这项地质年代学研究将改进和测试一种新的褶皱测年方法的基础上测年的伊利石粘土，确定时间的折叠在阿巴拉契亚山脉中部的美国东部，并证明该方法？的潜力，为世界各地的其他地点。 除了该项目的科学目标外，它还为一名博士科学家的研究提供支持，并为本科生提供研究经验，从而为重要的STEM（科学、技术、工程和数学）学科的教育工作队伍发展做出贡献。此外，将通过专业出版物和在专业会议和公开演讲上的演讲，广泛传播主要研究人员的研究和教育宣传。这项研究也将在网上教科书的功能，并将用于课堂和现场经验的本科生。 伊利石测年也有直接的应用于工业和社会资源的需求，因为化石燃料和矿产工业通常涉及相同的地质背景和条件，在这项研究中，主要研究人员最近开发了一种方法，使用氩地质年代学的新方解石伊利石褶皱测年，并测试其在墨西哥褶皱冲断带的案例研究中的应用。 该方法依赖于一个单一的样品的粒度级伊利石的定量，和他们各自的年龄;过时的粒度级的外推确定变形的年龄和他们的错误。 阿巴拉契亚山谷和山脊项目有两个主要目标：（1）通过开发更好的粘土定量方法来改进伊利石测年方法，同时减少误差估计;（2）确定著名的阿巴拉契亚山脉中部的褶皱年龄，假设褶皱向前发展;目前，褶皱年龄在地层学上被归类为上古生界;（3）直接制约了美国东部区域古地磁重磁化、成矿作用和经济矿床的形成时间。