Structural and Metamorphic Evolution of the Walker Lee Lake Arrigetch Peaks Region, Central Brooks Range, Alaska

阿拉斯加布鲁克斯山脉中部沃克李湖阿里吉奇峰地区的结构和变质演化

• 批准号: 9004270
• 负责人: Brian Patrick
• 金额: $ 2.22万
• 依托单位: New Mexico Institute of Mining and Technology
• 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 1991-01-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004270&HistoricalAwards=false
• 关键词: Structural; Metamorphic; Evolution; Walker; Lee

During development of collisional orogens high pressure-low temperature metamorphism commonly forms during the subduction phase, but is often obscured by post-tectonic thermal equilibration or by later deformation and mineral growth. The metamorphic core of the Brooks range exposes regional high pressure-low temperature rocks adjacent to lower grade fold and thrust belt rocks. This project will map structures across this structural/metamorphic boundary, conduct thermobarometry on collected samples and perform radiometric age determination. Results will be used to characterize the metamorphic and structural conditions during orogenesis and to determine the uplift history of these high pressure/low temperature rocks.

在碰撞造山带发育过程中，高压-低温变质作用一般形成于俯冲阶段，但往往被构造后热平衡作用或后期变形和矿物生长所掩盖。布鲁克斯山脉变质核暴露出与低品位褶皱冲断带岩相邻的区域性高压-低温岩石。该项目将绘制跨越这一构造/变质边界的构造图，对收集的样品进行温压测量，并进行放射性年龄测定。这些结果将被用来描述造山作用期间的变质和构造条件，并确定这些高压/低温岩石的抬升历史。