Petrologic Studies in Southwestern New England

新英格兰西南部的岩石学研究

• 批准号: 8816382
• 负责人: Robert Tracy
• 金额: $ 6.08万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-01-01 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816382&HistoricalAwards=false
• 关键词: Petrologic; Studies; Southwestern; New; England

The research proposed here comprises an integrated study of metamorphic and associated felsic plutonic rocks in the multiply deformed and polymetamorphosed southwestern New England terrane. The goal of this project is to use this classic Appalachian terrane to characterize the petrologic and thermal processes resulting from the tectonic overthickening that accompanied the Taconian (Ordovician) collisional event described in tectonic models of western New England. The study will also provide a detailed picture of Acadian (Devonian) thermal evolution in the eastern portion of the southwestern New England highlands. Most important, our efforts will also be concentrated on examining the exact nature of the overprinting of later on earlier metamorphisms in the zone of overlap between the Taconian and Acadian events. The techniques we intend to use include: quantitative geothermobarmometry based on mineral chemical analyses by electron microprobe, to determine fluid-rock inter- action histories and to help constrain uplift histories; argon isotopic analysis of key minerals to deduce temperature-time evolution of key areas. Because our emphasis in applying our results is in determining the evolution of an orogenic belt, the study is focussed on three geographic areas: southwestern Connecticut and adjacent southeastern New York where we can document predominantly Taconian metamorphic effects; the central and eastern belt of the western highlands where the polymetamoprhic overlap is best displayed.

这里提出的研究包括一项综合研究， 变质及伴生长英质深成岩 新英格兰西南部的一个变形和多变质的地区。 这个项目的目标是利用这个经典的阿巴拉契亚山脉 描述岩石学和热过程 这是由于伴随着 构造上描述的塔昆（奥陶纪）碰撞事件 西部新英格兰的典型。 该研究还将提供一个 详细的照片中的泥盆纪热演化 新英格兰高地西南部的东部。 最 重要的是，我们的工作还将集中在审查 后来在早期的叠印的确切性质 塔科尼和塔科尼之间重叠区的变质作用 埃塞俄比亚事件。 我们打算使用的技术包括： 矿物化学定量地质温压法 电子探针分析，以确定流体岩石间， 作用历史和帮助约束隆升历史;氩 关键矿物同位素分析推断温度-时间 关键领域的发展。 因为我们在应用我们的 结果是确定造山带的演化， 研究集中在三个地理区域：西南部 康涅狄格州和邻近的纽约东南部， 记录了主要是塔康期变质作用; 西部高地的东部地带， 最好地显示了多变形叠印的重叠。