Combined Petrologic, 40Ar/39Ar, and Fluid Inclusion Study ofan Inverted Metamorphic Sequence, Maclaren Metamorphic Belt,Alaska

阿拉斯加州麦克拉伦变质带反变质层序的岩石学、40Ar/39Ar 和流体包裹体联合研究

• 批准号: 8719368
• 负责人: Lincoln Hollister
• 金额: $ 7.98万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8719368&HistoricalAwards=false
• 关键词: Combined; Petrologic; 40Ar; 39Ar; Fluid

Continued field and lab studies of the Maclaren metamorphic belt are proposed to determine the thermal and tectonic history of these rocks, which occur in a suture zone between accreted terranes in South-central Alaska. The belt is an example of inverted metamorphic rocks which grade upward in temperature. Syntectonic tonalite sills are associated with the higher grade rocks but the thermal gradient is interpreted as being caused by thrusting of hot, deeper crust rocks over a thick sediment package during continent - continent collision. They are exposed by subsequent uplift and erosion. The aim of the research is to determine P-T history from which magnitude of uplift can be estimated. Ar-Ar geochronology will be used to estimate uplift rates. These results will be used to interpret the tectonic history and causes for heating.

继续进行麦克拉伦变质作用的野外和实验室研究 带，以确定热历史和构造历史 这些岩石，其中发生在缝合带之间的增生 阿拉斯加州中南部的一个州。 皮带是一个例子， 温度向上递变的倒转变质岩。 同构造英云闪长岩岩床与较高品位的 岩石，但热梯度被解释为是由 热的、较深的地壳岩石在厚的沉积物包上的逆冲作用 在大陆与大陆的碰撞中。 他们被暴露在 随后的抬升和侵蚀。 研究的目的是 确定P-T历史，根据该历史可以确定抬升的幅度， 估算 Ar-Ar地质年代学将用于估计隆起 rates. 这些结果将被用来解释构造 加热的历史和原因。