Collaborative Research: 4-D Assessment of the Earliest Magmatism in a Continental Margin Arc

合作研究：大陆边缘弧中最早岩浆活动的 4-D 评估

• 批准号: 0001004
• 负责人: Maria Crawford
• 金额: $ 10.7万
• 依托单位: Bryn Mawr College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001004&HistoricalAwards=false
• 关键词: Collaborative; Research; Assessment; Earliest; Magmatism

0000719 Beard0001004 Crawford0001102 SinhaAs exotic material accretes to a continental margin by convergent tectonics, a number of important changes in conditions occurs, some of which lead to production of magma that subsequently becomes involved in the ongoing structural development of the accretion. As tonalitic plutons are commonly generated as continental margin arcs accrete, their composition provides information about the P-T-X H2O conditions of the source region, and combined with fabric and structural data, provide constraints for the transport and emplacement processes that might lead to chemical modification of magmas as they traverse and are emplaced in the crust. The project will utilize a suite of tonalitic plutons on Revillagigedo Island in southeastern Alaska that record early stages of continental arc magmatism. Results are expected to detail and track the origin, modification and tectonic interactions of these magmas in this convergent setting.

0000719 Beard0001004 Crawford0001102 Sinha 当外来物质通过聚合构造作用增生到大陆边缘时，会发生许多重要的条件变化，其中一些导致岩浆产生，随后参与增生的持续结构发展。 由于英英闪长质岩体通常是在大陆边缘弧增生时生成的，因此它们的成分提供了有关源区 P-T-X H2O 条件的信息，并与组构和结构数据相结合，为传输和侵位过程提供了约束，这些过程可能导致岩浆在穿过并侵占地壳时发生化学改变。 该项目将利用阿拉斯加东南部雷维拉吉赫多岛的一系列英云岩岩体，记录大陆弧岩浆作用的早期阶段。 预计结果将详细描述和追踪这些岩浆在这个汇聚环境中的起源、改造和构造相互作用。