Structural Controls on Magma Transport and Vertical Coupling in the Continental Lithosphere

大陆岩石圈岩浆输运和垂直耦合的构造控制

• 批准号: 0313626
• 负责人: Keith Klepeis
• 金额: $ 1.35万
• 依托单位: University of Vermont & State Agricultural College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-03-15 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0313626&HistoricalAwards=false
• 关键词: Structural; Controls; Magma; Transport; Vertical

An international field forum in Fiordland, New Zealand (April 26 to May 6, 2003) is providing members of the Solid Earth Science community with an opportunity to examine the mechanisms by which magma is generated, segregated and transported through continental crust and how these processes affect the mechanical evolution of the lithosphere. The Fiordland location is significant because few field sites allow geoscientists to examine directly structural and magmatic features that evolved simultaneously within large sections of the lower crust. Fiordland contains rare exposures of high-pressure migmatite and lower crustal structural features that formed at unusually deep levels of a Cretaceous mountain system (25-50 km paleodepths). The spectacular preservation of features at this site are stimulating new ideas and are providing a basis for evaluating the processes of melt generation and escape from the lower crust and how migrating magma interacts with deformation at the lithospheric scale. Specific issues addressed include: 1) evidence of rapidly evolving thermal and structural regimes in the lower crust and effects on lithosphere evolution; 2) evidence of fluid and melt sources and changing mechanisms of magma segregation and transport through the lower crust; 3) feedback mechanisms among crustal melting, granulite facies metamorphism and deformation; 4) effects of crustal melting and magmatism on vertical coupling/decoupling processes within the lithosphere; 5) flow patterns in natural lower crustal shear zones and their relationship to deformation and magma transport processes; 6) space-time controls on deformation partitioning and strain localization processes in the lower crust. The unique geologic setting of Fiordland allows 30 geoscientists to exchange current knowledge and new ideas that are well expressed by the geology of specific field sites. This project also partially supports 5-8 students and a post-doctoral associate to attend the meeting. The participation of young scientists provides opportunities for students to meet other geoscientists conducting research in the same or similar fields of interest, but with different expertise. It also allows them to interact with mature scientists and an opportunity to study some spectacularly exposed deep crustal processes.

2003年4月26日至5月6日在新西兰峡湾举行的国际野外论坛为固体地球科学界的成员提供了一个机会，以研究岩浆产生、分离和通过大陆地壳运输的机制，以及这些过程如何影响岩石圈的机械演化。峡湾的位置是重要的，因为很少有现场允许地球科学家直接检查结构和岩浆的特点，同时在下地壳的大部分演变。峡湾包含罕见的高压混合岩和下地壳结构特征，形成于白垩纪山脉系统的异常深的水平（25-50公里古深度）。在这个网站的壮观的保存功能是刺激新的想法，并提供了一个基础，评估过程中的熔体生成和逃离下地壳，以及如何迁移岩浆相互作用与变形在岩石圈尺度。具体内容包括：1）下地壳快速演化的热机制和构造机制及其对岩石圈演化的影响; 2）下地壳流体和熔体来源及其分异和迁移机制的变化; 3）地壳熔融、麻粒岩相变质和变形之间的反馈机制;（4）地壳熔融和岩浆活动对岩石圈垂直耦合/解耦过程的影响：（5）天然下地壳剪切带中的流动模式及其与变形和岩浆输运过程的关系;（6）下地壳变形分配和应变局部化过程的时空控制。峡湾独特的地质环境使30名地球科学家能够交流当前的知识和新的想法，这些知识和新的想法很好地表达了特定领域的地质情况。该项目还部分支持5-8名学生和一名博士后助理参加会议。青年科学家的参与为学生提供了机会，以满足其他地球科学家进行研究在相同或类似的领域的兴趣，但具有不同的专业知识。它还使他们能够与成熟的科学家进行互动，并有机会研究一些异常暴露的深部地壳过程。