Rifting and Volcanism on the Antarctic Peninsula

南极半岛的裂谷和火山活动

• 批准号: 8817126
• 负责人: Martin Fisk
• 金额: $ 8.26万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817126&HistoricalAwards=false
• 关键词: Rifting; Volcanism; Antarctic; Peninsula

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.

布兰斯菲尔德、古斯塔夫王子和拉森裂谷形成了独特的三重裂谷 横跨南极洲北方端的火山裂谷系 半岛与南设得兰群岛海沟和岛弧平行。 的 布兰斯菲尔德裂谷形成了布兰斯菲尔德海峡弧后盆地， 将南设得兰群岛岛弧与 南极半岛。 该项目包括详细的地球化学和 火山作用的岩石学研究产生于最早的阶段 弧的断裂和弧后盆地的形成。 该系统中的所有三个裂缝都产生了晚第三纪-最近纪 碱性玄武岩提供了一个独特的机会， 俯冲污染的地幔楔 通过分析 地球化学，岩石学和同位素特征， 同时发生的火山活动 该项目将能够 限制化学污染的化学和空间范围 地幔楔被俯冲的岩石圈板片所覆盖