Rifting and Volcanism on the Antarctic Peninsula

布兰斯菲尔德、古斯塔夫王子和拉森裂谷形成了一个独特的三重火山裂谷系统，横跨南极半岛北端，平行于南设得兰海沟和岛弧。布兰斯菲尔德裂谷创造了布兰斯菲尔德海峡弧后盆地，将南设得兰岛弧与南极半岛西北端分开。该项目包括对弧裂和弧后盆地形成的早期阶段产生的火山活动进行详细的地球化学和岩石学研究。该系统中的所有三个裂谷都产生了晚第三纪-最近的碱性玄武岩，这为采集俯冲污染的地幔楔形的化学成分提供了独特的机会。通过分析这三个裂谷近期同时发生的火山活动的地球化学、岩石学和同位素特征。该项目将能够限制俯冲岩石圈板块对地幔楔化学污染的化学和空间范围。

The Bransfield, Prince Gustav, and Larsen Rifts form a unique triple volcanic rift system that straddles the northern tip of the antarctic Peninsula parallel to the South Shetland Trench and Island Arc. The Bransfield Rift has created the Bransfield Strait back-arc basin that separates the South Shetland Island Arc from the northwest tip of the Antarctic Peninsula. This project includes a detailed geochemical and petrological study of the volcanism produced in the earliest stages of the rifting of an arc and the creation of a back-arc basin. All three of the rifts in this system have produced Late Tertiary-Recent alkali basalts that provide a unique opportunity to sample the chemistry of a subduction contaminated mantle wedge. By analyzing the geochemistry, petrology and isotopic signature of the recent, simultaneous volcanisms in these three rifts. This project will be able to constrain the chemical and spatial extent of chemical contamination of a mantle wedge by a subducting lithospheric slab.