Timing of Paleozoic Metamorphism and Magmatism in the Appalachians of Northern Massachusetts and Southern New Hampshire

马萨诸塞州北部和新罕布什尔州南部阿巴拉契亚山脉的古生代变质作用和岩浆作用的时间

• 批准号: 9304142
• 负责人: Robert Tucker
• 金额: $ 19.83万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304142&HistoricalAwards=false
• 关键词: Timing; Paleozoic; Metamorphism; Magmatism; Appalachians

The metamorphosed stratified and intrusive rocks of late Precambrian, Ordovician, Silurian and Devonian age in New England records an extremely complicated "Acadian" collisional history. Recent results of radiometric age dating in the Bronson Hill anticlinorium and Merrimack synclinorium of central Massachusetts has revealed two distinct age groups of "Acadian" (early and late Devonian) metamorphism separated by a generally higher pressure zone of late Pennsylvanian metamorphism. This project will follow these features i the region to determine their spatial distribution and to obtain a more precise picture of the temporal evolution of the New England appalachians, and to improve understanding of its setting within the larger framework of the orogen.

变质层状侵入岩 晚前寒武纪、奥陶纪、志留纪和泥盆纪 新英格兰记录了一个极其复杂的“古希腊人” 碰撞历史 放射性年龄的最新结果 布朗森山复背斜和梅里马克 马萨诸塞州中部的复向斜发现了两个 不同年龄组的“早泥盆世”（早、晚泥盆世） 被高压带分隔的变质作用 宾夕法尼亚晚期的变质作用 该项目将 根据这些特征， 空间分布，并获得更精确的图像， 新英格兰阿巴拉契亚山脉的时间演变， 为了更好地了解它在更大范围内的背景， 造山带的框架。