An Integrated Study of Deformation, Metamorphism, and Geo- chronology in the Archean Rocks Along the Northern Margin ofthe Quetico Subprovince in NE Minnesota and Adjacent Canada

明尼苏达州东北部和邻近加拿大奎蒂科副省北缘太古宙岩石变形、变质作用和年代学的综合研究

• 批准号: 9005039
• 负责人: Robert Bauer
• 金额: $ 7万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005039&HistoricalAwards=false
• 关键词: Integrated; Study; Deformation; Metamorphism; Geo

Kyanite-bearing mineral assemblages are rare in the Archean where high-grade plutonic-metamorphic terranes tend to be dominated by low-pressure high-temperature metamorphic regimes. This has led to speculations regarding higher geothermal gradients in the Archean and has restricted analogies between high-grade Archean terranes and younger terranes with established relationships to convergent margin plate tectonic settings. This work will expand on a study of Archean rocks in the Quetico subprovince of northeastern Minnesota where kyanite is present and a plate tectonic model has been developed. The objective is to determine the relationship of deformation and metamorphism in the deep crustal level to adjacent shallower levels of the belt exposed to the east. Results are expected to clarify Archean plate settings and the nature of the Archean geothermal gradient.

含蓝晶石的矿物组合在太古代中是罕见的 高级深成变质火山岩 以低压高温变质体制为主。 这导致了关于更高地热的猜测 在太古代的梯度，并有限制的类比之间 太古代高级古生界和较年轻古生界， 与会聚边缘板块构造环境的关系。 这 工作将扩大对基蒂科太古代岩石的研究 明尼苏达州东北部的一个亚省，有蓝晶石 建立了板块构造模型。 目标是 以确定变形与变质的关系， 地壳深部水平到邻近的带的较浅水平 暴露在东方。 结果有望澄清太古代 板块设置和太古宙地热梯度的性质。