Collaborative Research: Controls on Isograd Bathograd Patterns in Metamorphic Belts: The Triple Point Bathograd in Northern New England

合作研究：对变质带中等梯度赤梯度模式的控制：新英格兰北部的三相点赤梯度

• 批准号: 8720368
• 负责人: Howard Day
• 金额: $ 7.23万
• 依托单位: University of California-Davis
• 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: 1988-03-01 至 1991-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720368&HistoricalAwards=false
• 关键词: Collaborative; Research; Controls; Isograd; Bathograd

The proposed research addresses the role of burial depths, uplift rates, and thermal parameters as controls on large-scale patterns of mineral equilibria in classic metamorphic terranes in Vermont and New Hampshire. Also, it is proposed that regional variations in thermal properties of the crust are required to explain the complicated variations in pressures (burial) and temperatures inferred for rocks in this region. Combined field and theoretical studies will be carried out to evaluate this hypothesis. Specifically, detailed studies will evaluate metamorphic pressure, cooling rates near peak metamorphism, and effects of lateral heat transfer to determine the relative roles of he above three parameters on distribution of mineral isograds. Timing of metamorphism will be determined by geochronological methods to understand the connection between tectonic and metamorphic history.

这项拟议的研究解决了埋藏深度、隆升速率和热参数对佛蒙特州和新罕布夏州经典变质地体中大规模矿物平衡模式的控制作用。此外，还提出需要地壳热物性的区域差异来解释该地区岩石所推断的压力(埋藏)和温度的复杂变化。将进行实地和理论相结合的研究来评估这一假说。具体地说，详细的研究将评估变质压力、峰期变质作用附近的冷却速度和侧向热传递的影响，以确定上述三个参数对矿物等值线分布的相对作用。变质作用的时间将由地质年代学方法确定，以了解构造和变质历史之间的联系。