Thermochronology Applied to the Metamorphic and Tectonic History of the Merrimack, Nashoba, and Hope Valley Zones, Southeastern New England

热年代学应用于新英格兰东南部梅里马克、纳肖巴和希望谷地区的变质和构造历史

• 批准号: 8803540
• 负责人: Robert Wintsch
• 金额: $ 2.23万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-01 至 1991-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803540&HistoricalAwards=false
• 关键词: Thermochronology; Applied; Metamorphic; Tectonic; History

Modern plate tectonic theory is compatible with the idea that much of eastern New England consists of allochthonous terranes that were accreted to North America during orogenesis, however, present data do not allow discrimination between several hypotheses concerning which orogenic event accompanied which accretion event. This project will attempt to bracket the timing of metamorphism and the timing of fault activity at terrane boundaries across a transect in eastern Connecticut. Argon-argon age spectra from hornblende, muscovite, biotite and feldspar will be measured in rocks collected from the Avalon, Putman-Nashoba and Merrimac terranes and from the tectonically important Lake Char, Tatnik and Clinton-Newbury boundaries. These data will be used to determine if terrane juxta position occurred pre-or post-metamorphism and the degree of displacement on faults and thereby provide considerable constraints on the timing of tectonic events during Paleozoic activity.

现代板块构造理论与这一观点是一致的， 在新英格兰东部， 然而，目前的数据表明， 不允许在几个假设之间进行区分， 造山事件伴随着增生事件。 该项目将 试图将变质作用的时间和断层的时间区分开来 在东部样带的边界活动 康涅狄格 角闪石，白云母， 黑云母和长石将在岩石中测量， 阿瓦隆、普特曼-纳什巴和梅里马克埃斯， 重要的查尔湖、塔特尼克和克林顿-纽伯里边界。 这些数据 将被用来确定是否发生前或 后变质作用和断层位移程度， 对地壳构造事件的发生时间提供了相当大的限制 在古生代的活动。