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

合作研究：南极洲干谷从俯冲到伸展岩浆作用的转变

• 批准号: 0636607
• 负责人: Michael Garcia
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0636607&HistoricalAwards=false
• 关键词: Collaborative; Research; Transition; Subduction; Extensional

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.

该项目是对南极洲干谷万代堑群进行实地和实验室调查。这些岩脉横切罗斯造山运动期间产生的寒武纪-奥陶纪花岗岩类岩体，标志着俯冲停止和伸展岩浆作用开始之间的过渡。许多垂死的聚合板块边缘转变为伸展岩浆作用，而干谷提供了一个绝佳的机会来检查经历过这种转变的板块的浅根。由于其特殊的暴露、双峰长英质和镁铁质成分以及复杂的场关系，万达岩脉有可能揭示南极构造历史这一重要阶段的见解。更广泛的影响包括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令人兴奋的实地研究项目。