A Petrologic Investigation of the Yunaska Volcanic Complex, Aleutian Islands: Assessment of the Influence of Time and Space on Subduction Magmatism

阿留申群岛尤纳斯卡火山杂岩的岩石学研究：评估时间和空间对俯冲岩浆作用的影响

• 批准号: 9117809
• 负责人: James Myers
• 金额: $ 25.79万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-01 至 1997-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117809&HistoricalAwards=false
• 关键词: Petrologic; Investigation; Yunaska; Volcanic; Complex

This project is for a geologic and petrologic investigation of the Yunaska Volcanic Center. Yunaska has been chosen because it: 1) sits on unextended crust of the arc massif; 2) has numerous unusual geomorphic characteristics; 3) displays evidence for both young and old vent areas; 4) is spatially removed from the Amlia Fracture Zone; and 5) occurs in a geologically unknown part of the ALeutian arc. The PIs plan to map and sample extensively the island during three field seasons. Using this information as well as K-Ar dating, they will reconstruct the geologic history of the island. Analytical work will characterize the volcanic rocks petrographically as well as geochemically. This detailed characterization of Yunaska should improve materially our knowledge of the Aleutian arc as well as the petrologic processes responsible for its volcanic products. Ultimately, such information should enhance our understanding of subduction magmatism in general.

该项目是对该地区的地质和岩石学调查。 尤纳斯卡火山中心。 Yunaska被选中是因为：1） 坐落在弧的未延伸的地壳上; 2）有许多不寻常的 地貌特征; 3）显示年轻和 旧的喷口区域; 4）在空间上从Amlia断裂中移除 区;和5）发生在一个地质未知的部分阿留申 弧 PI计划在2015年期间对该岛进行广泛的测绘和采样。 三个季节的田野 利用这些信息以及K-Ar 他们将重建这座岛屿的地质历史 分析工作将确定火山岩的特征 从岩石学和地球化学角度来看。该详细 对尤纳斯卡的描述应该会大大提高我们对 阿留申岛弧的形成以及 火山产物。 最终，这些信息应 加深我们对俯冲岩浆作用的理解。