International: US-Germany Doctoral Dissertation Enhancement: High-resolution Laser Ablation ICP-MS Analysis of Metamorphic Rocks from California, Germany, and the Czech Republic

国际：美德博士论文强化：对加州、德国和捷克共和国变质岩进行高分辨率激光烧蚀 ICP-MS 分析

• 批准号: 1036477
• 负责人: Maureen Feineman
• 金额: $ 1.49万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1036477&HistoricalAwards=false
• 关键词: International; US; Germany; Doctoral; Dissertation

Subduction zones are one of the primary manifestations of plate tectonics, occuring where two of Earth's plates collide and one slips beneath the other. Subduction of one plate beneath another functions as the primary mechanism for mass transfer between the surface and interior of the Earth. An understanding of fluid-driven chemical cycling in subduction zones provides us with the tools to discover valuable natural resources such as metal ores and natural gas and oil reserves, to develop new resources such as geothermal energy, and to understand the geologic hazards of subduction zones such as earthquakes and volcanic eruptions. This study focuses on the distribution of trace elements in fluids produced in the down-going plate during subduction zone metamorphism. These fluids are responsible for generating the magmas that produce arc volcanoes. In particular, high-pressure metamorphic rocks such as eclogite (subducted oceanic crust) are valuable resources for studying fluid production and transfer within the deeper parts of the subduction zone. In order to track the mobility of trace elements in subduction fluids, this study will examine the geochemistry of individual minerals found in eclogite from the Ring Mountain locality of the Franciscan Complex in California, and the Erzgebirge (Ore Mountains) region of Germany and the Czech Republic. In particular, garnet and rutile will be analyzed in detail to examine the behavior of rare earth and high field strength elements during the production and transport of fluids in eclogitic rocks.The preferred method for analyzing a broad spectrum of trace elements in individual mineral grains is laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Complementary LA-ICP-MS facilities exist at Pennsylvania State University in the US and the University of Mainz in Germany. Faculty at Mainz have developed cutting edge methods that make use of information encoded in minor mineral phases in metamorphic rocks, such as Zr-in-rutile thermometry and U-Pb geochronology. Together these methods can be used to develop a temperature-time history for our samples to help us interpret the conditions under which fluid transport occurred. Penn State PhD student Alicia Cruz-Uribe will spend six weeks at the LA-ICP-MS laboratory in Mainz learning how to implement these specialized analytical techniques from her host and mentor, Dr. Thomas Zack. Cruz-Uribe will return to the US with her knowledge of these techniques to be implemented at the LA-ICP-MS facility at Penn State, under the guidance of advisor Dr. Maureen Feineman. The student will benefit both by direct exposure to new methods and new ways of thinking as well as by teaching those methods to other students upon her return. Both institutes benefit by virtue of the collaborative international research project. This project is funded jointly by the Office of International Science and Engineering and the Division of Earth Sciences.

俯冲带是板块构造的主要表现之一，发生地球的两个板碰撞，另一个板块在另一个板上。 另一盘在另一盘下方的俯冲作用，是地面表面和内部之间传质的主要机制。 对俯冲带中流体驱动的化学循环的理解为我们提供了发现有价值的自然资源，例如金属矿石，天然气和油储备等有价值的自然资源，以开发新的资源，例如地热能，并了解俯冲区域的地质危害，例如地震和火山喷发。这项研究的重点是在俯冲带变质期间在下板中产生的流体中的痕量元素的分布。 这些流体负责产生产生弧火山的岩浆。 特别是，高压变质岩（例如叶绿石）（俯冲海壳）是研究俯冲带更深层次部分的流体生产和转移的宝贵资源。为了跟踪俯冲流体中微量元素的迁移率，本研究将检查来自加利福尼亚州方济各会综合体的环山地区中的eclogite中的各个矿物质的地球化学，以及德国和捷克共和国的Erzgebirge（矿山）地区。 特别是，将详细分析石榴石和金红石，以检查稀土和高田间强度元素在岩石岩石中流体的生产和运输过程中的行为。分析各个矿物粒子中广泛元素的首选方法是激光诱导的血浆质量质量图解（LA-la-icpp-ms）。 美国的宾夕法尼亚州立大学和德国的美因兹大学都有互补的LA-ICP-MS设施。 Mainz的教师开发了最先进的方法，该方法利用了在变质岩石中的次要矿物相中编码的信息，例如刺激性的ZR-In-Rutile温度计和U-PB地球人数。 这些方法共同用于为我们的样品开发温度时间病史，以帮助我们解释流体转运的条件。宾夕法尼亚州立大学的学生Alicia Cruz-Uribe将在Mainz的LA-ICP-MS实验室度过六个星期，学习如何从她的主人和导师Thomas Zack博士那里实施这些专业的分析技术。 克鲁兹 - 乌里贝（Cruz-Uribe）将在顾问莫琳·费恩曼（Maureen Feineman）的指导下，将在宾夕法尼亚州的LA-ICP-MS设施中返回美国。 学生将通过直接接触新方法和新思维方式以及其他学生在回来后向其他学生传授这些方法，从而受益。 这两家机构都受益于协作国际研究项目。 该项目由国际科学与工程办公室以及地球科学部共同资助。