CAREER: Exhumation of a High-Grade Metamorphic Terrane, and Late-Stage Orogenic Collapse in the Southeastern New England Appalachians

职业生涯：新英格兰东南部阿巴拉契亚山脉高级变质地体的剥露和晚期造山崩塌

• 批准号: 1052458
• 负责人: Yvette Kuiper
• 金额: $ 49.61万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1052458&HistoricalAwards=false
• 关键词: CAREER; Exhumation; Grade; Metamorphic; Terrane

The Appalachians are a composite mountain belt consisting of various microcontinents, oceanic and continental volcanic arcs and (meta)sedimentary domains that collided during the Appalachian mountain building events. Geological investigations in the Appalachian commonly emphasize the amalgamation history of the various terranes. This proposal focuses on the syn- to post-collisional exhumation history of the deeper domains, as well as late-stage collapse of the mountain belt, to gain fundamental insights into late- to post-mountain formation processes in the northern Appalachians and beyond. Research is carried out in the southeastern New England section of the Appalachians through a strongly integrated research and educational plan.The southeastern New England Appalachians generally consist of three terranes. From west to east they are the Merrimack, Nashoba and Avalon terranes. The Nashoba terrane is bounded by moderately NW-dipping faults. Preliminary field data suggest that deeper domains within the Nashoba terrane may have extruded towards the east, based on fold geometries, metamorphic characteristics and the apparent relationship between approximately 395 million year melts in the Nashoba terrane and approximately 395 million year intrusions in the structurally overlying Merrimack terrane. Furthermore, preliminary field observations indicate that most inter- and intra-terrane shear zones show evidence for late low-grade normal movement, presumably related to late-stage mountain collapse. The purpose of this research is to investigate both the high-temperature and low-temperature exhumation and collapse mechanisms through a combination of field mapping, detailed structural analysis and cutting-edge radiometric dating techniques.Integration of research and field work into the undergraduate student experience is central to this project. Students from various geoscience departments in the Boston area are encouraged to participate and collaborate through a Geological Field Research course, giving them an excellent opportunity to discuss research with their peers and creating a stronger community. Subsequent thesis research by undergraduate and MS students involves analytical work at Boston College, MIT and UMass Amherst, strengthening the relationship between the three labs and between students and faculty. Students, especially women and minority students, are encouraged to participate through existing courses, departmental advising activities and other geoscience departments. Students from underrepresented groups are reached through the Boston College AHANA (African-American, Hispanic, Asian and Native American) student office and the McNair program for undergraduates who are low-income and first-generation college participants, and/or part of underrepresented groups. Funding for this project is provided by the NSF EAR Tectonics Program, with support from the NSF EAR EarthScope and Education and Human Resources Program.

阿巴拉契亚人是一条复合山带，由各种微型植物，海洋和大陆火山弧和（元）沉积域组成，在阿巴拉契亚山区建筑活动期间相撞。阿巴拉契亚语中的地质调查通常强调各种地形的融合历史。该提议着重于较深域的综合挖掘历史以及山带的后期崩溃，以获得对北阿巴拉契亚人及其他地区后期到后芒特的地层过程的基本见解。研究是在阿巴拉契亚人的东南新英格兰地区通过强烈综合的研究和教育计划进行的。新英格兰东南阿巴拉契亚人通常由三个地形组成。从西到东部，它们是Merrimack，Nashoba和Avalon Terranes。 Nashoba Terrane受中度倾斜故障的界定。初步田间数据表明，基于折叠的几何形状，变质特征和纳索巴山脉中大约3.95亿年融化的明显关系，纳索巴地座内的更深层次的域可能已挤出向东，在结构上大约3.95亿年的融化中，大约3.95亿年融化了3.95亿年。此外，初步的野外观察表明，大多数跨层间剪切区显示出晚期低度正常运动的证据，大概与晚期山塌陷有关。这项研究的目的是通过田间映射，详细的结构分析和尖端的辐射测年技术的结合来研究高温和低温挖掘和崩溃机制。研究和现场工作与本科生经验的整合是该项目的核心。鼓励来自波士顿地区各个地球科学部门的学生通过地质实地研究课程参加和合作，为他们提供了与同龄人讨论研究并创建更强大社区的绝佳机会。本科生和MS学生随后的论文研究涉及波士顿学院，麻省理工学院和UMass Amherst的分析工作，从而加强了这三个实验室之间以及学生与教职员工之间的关系。鼓励学生，尤其是妇女和少数族裔学生，通过现有课程，部门建议活动和其他地球科学部门参加。通过波士顿学院（非裔美国人，西班牙裔，亚洲和美洲原住民）的学生办公室和麦克奈尔大学的本科生计划，他们是低收入和/或一部分不足者的学生。 NSF EAR Tectonics计划为该项目提供了资金，并得到了NSF Ear Earthscope和Education and Human Resources计划的支持。