International Postdoctoral Fellows: Paleomagnetic Exploration of the Process of Eduction and Cooling of Deep- Seated Metamorphic Rocks Following Laurentian-Baltic Plate

国际博士后：劳伦-波罗的海板块后深部变质岩的析出和冷却过程的古地磁探索

• 批准号: 9403645
• 负责人: Suzanne McEnroe
• 金额: $ 4.47万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1995-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9403645&HistoricalAwards=false
• 关键词: International; Postdoctoral; Fellows; Paleomagnetic; Exploration

9403645 McEnroe This award is under the International Junior Investigator and Postdoctoral Fellows Program, which enables U.S. scientists and engineers to conduct three to twelve months of research abroad at research centers of proven excellence. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad. This award will support a twelve-month postdoctoral research visit by Dr. Suzanne A. McEnroe of the University of Massachusetts at Amherst to work with Dr. Trond H. Torsvik at the Norwegian Geological Survey (NGU) on paleomagnetic exploration of the processes of education and cooling of deep-seated metamorphic rocks following Laurentian-Baltic plate collision in the Western Gneiss Region, Norway. Research on the paleomagnetism of metamorphic rocks is designed to determine the orientation of the earth's magnetic field at the time of formation of the protolith, at the time when new magnetic minerals grew during low-temperature metamorphism, or at the time when magnetic minerals cooled below the Curie temperature (580 degrees Celsius) or Neel temperature (670 degrees Celsius) following high-temperature metamorphism. The western gneiss region of the Scandinavian Caledonides in Norway contains a wide variety of rock types within the Baltic plate that were subducted to depths up to 100 km and heated to temperatures up to 750 degrees Celsius before being rapidly "educted" and cooled against overlying cooler remnants of the Laurentian plate. The acquisition of paleomagnetic vectors from the metamorphic rocks is made difficult by the factors of coarse grain size and fabric anisotropy, but numerous targets of opportunity are available in the form of apparently isotropic eclogites and basement gabbro masses with relict primary distributions of magnetic minerals. Using the superb equipment at the NGU, it is intended to use this paleomagnetic tool to enhance our unde rstanding of the relationships between metamorphic reactions, cooling deformation, time, and the acquisition of magnetic signatures in these deep- seated metamorphic rocks. The results of this research would contribute to overall understanding of deep-seated processes, rock-magnetic properties of these metamorphic rocks, and crustal history in a zone of continental collision. ***

9403645 McEnroe 该奖项属于国际初级研究员和博士后研究员计划，该计划使美国科学家和工程师能够在国外经过证明卓越的研究中心进行三到十二个月的研究。 该项目的奖项提供了联合研究以及使用国外独特或互补的设施、专业知识和实验条件的机会。 该奖项将支持马萨诸塞大学阿默斯特分校的 Suzanne A. McEnroe 博士进行为期 12 个月的博士后研究访问，与挪威地质调查局 (NGU) 的 Trond H. Torsvik 博士合作，对挪威西部片麻岩地区劳伦-波罗的海板块碰撞后深层变质岩的教育和冷却过程进行古地磁勘探。 变质岩古地磁学研究的目的是确定原岩形成时、低温变质作用中新的磁性矿物生长时、或高温后磁性矿物冷却到居里温度（580摄氏度）或尼尔温度（670摄氏度）以下时的地球磁场方向。 变质作用。 挪威斯堪的纳维亚喀里多尼德山脉西部片麻岩地区包含波罗的海板块内的多种岩石类型，这些岩石类型被俯冲到 100 公里的深度，并被加热到高达 750 摄氏度的温度，然后被快速“引出”并在上面较冷的劳伦板块残余物的作用下冷却。 由于粗粒度和组构各向异性的因素，从变质岩中获取古地磁矢量变得困难，但许多机会目标以明显各向同性的榴辉岩和基底辉长岩块的形式存在，具有磁性矿物的主要分布。 利用 NGU 的先进设备，我们旨在利用这种古地磁工具来增强我们对这些深层变质岩中变质反应、冷却变形、时间和磁特征采集之间关系的理解。 这项研究的结果将有助于全面了解深部过程、这些变质岩的岩石磁性以及大陆碰撞带的地壳历史。 ***