Emplacement of the Ultramafic Massifs of the Kenai Peninsula, Alaska and Their Possible Relationship to the Border Ranges Fault System

阿拉斯加基奈半岛超镁铁质地块的就位及其与边界山脉断层系统的可能关系

• 批准号: 9706699
• 负责人: Timothy Kusky
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706699&HistoricalAwards=false
• 关键词: Emplacement; Ultramafic; Massifs; Kenai; Peninsula

9706699 Kusky A long standing problem in plate tectonics relates to how mafic-ultramafic complexes become incorporated into subduction melanges. Several such bodies are particularly well exposed and preserved in the Kenai Penninsula, Alaska. The Alaskan bodies are even more intriguing because they represent pieces of broken up lower crust. This project will address this issue of the origin of ultramafic rocks by the multi-faceted approach of field work, structural analysis, geochemistry, and geochronology. The results will reveal to what extent large scale klippen can be involved in hundreds of km of transportation in an overthrusting event that brings such rocks to the surface, or whether they were part of the subducting oceanic slab that were caught up in the malenge.

[706699 . Kusky]板块构造学中一个长期存在的问题与基性-超基性杂岩如何并入俯冲混杂岩有关。在阿拉斯加的基奈半岛，有几个这样的尸体暴露得特别好，保存得也很好。阿拉斯加的尸体更有趣，因为它们代表了破碎的下地壳碎片。本项目将通过野外工作、构造分析、地球化学和地质年代学等多方面的方法来解决超基性岩的起源问题。研究结果将揭示大规模的克利彭在多大程度上参与了将这些岩石带到地表的逆冲活动中数百公里的运输，或者它们是否属于被玛伦格带捕获的俯冲海洋板块的一部分。