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

这个项目是对尤纳斯卡火山中心进行地质和岩石学调查。选择尤纳斯卡是因为：1)坐落在弧形地块未伸展的地壳上；2)有许多不寻常的地貌特征；3)既有年轻的喷口区，也有古老的喷口区；4)空间上脱离Amlia断裂带；5)发生在阿留申弧地质未知的部分。pi计划在三个野外季节对该岛进行广泛的测绘和取样。利用这些信息以及K-Ar测年法，他们将重建该岛的地质历史。分析工作将在岩石学和地球化学方面描述火山岩的特征。对尤纳斯卡的详细描述将大大提高我们对阿留申弧的认识，以及对其火山产物负责的岩石学过程。最终，这些信息将增强我们对俯冲岩浆作用的总体认识。

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.