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

本项目是对南极洲干谷的万达堤防群进行实地和实验室调查。这些岩脉与罗斯造山时期寒武—奥陶系花岗岩类岩体相交，标志着俯冲停止与伸展岩浆活动开始的过渡。许多垂死的会聚板块边缘转变为伸展岩浆活动，干谷提供了一个绝佳的机会来研究经历这种转变的板块的浅根。由于其特殊的暴露，双峰长英质和基性成分，以及复杂的场关系，万达岩脉有可能揭示南极构造史上这一重要阶段的见解。更广泛的影响包括主要本科生和两个研究机构之间的合作，以及支持本科生参与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.