Collaborative Research: The Transition from Subduction to Extensional Magmatism in the Dry Valleys of Antarctica

该项目是对南极洲干旱山谷中的万达堤坝群进行的实地和实验室调查。这些岩脉横切了罗斯造山运动期间产生的寒武纪-奥陶纪花岗岩类岩体，标志着从俯冲停止到伸展岩浆作用开始的过渡。许多濒临死亡的会聚板块边缘转化为伸展岩浆作用，而干燥的山谷提供了一个极好的机会来研究经历过这种转变的板块的浅根。由于其特殊的暴露、双峰式长英质和镁铁质成分以及复杂的野外关系，万达岩墙有可能揭示南极构造历史的这一重要阶段。更广泛的影响包括一个主要是本科生和两个研究机构之间的合作，以及支持本科生参与一个令人兴奋的实地研究项目。

This project is a field and laboratory based investigation of the Vanda dike swarm in the Dry Valleys of Antarctica. These dikes crosscut Cambro-Ordovician granitoid plutons produced during the Ross Orogeny, and mark the transition between the cessation of subduction and the onset of extensional magmatism. Many dying convergent plate margins convert to extensional magmatism, and the Dry Valleys provide a magnificent opportunity to examine the shallow roots of a plate that experienced this transition. Because of their exceptional exposure, bimodal felsic and mafic compositions, and complex field relations, the Vanda dikes have the potential to reveal insights into this important phase of Antarctic tectonic history. The broader impacts include collaboration between a primarily undergraduate and two research institutions, and support for undergraduate participation in an exciting, field-based research project.