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

当外来物质通过收缩构造向大陆边缘聚集时，发生了一些重要的条件变化，其中一些导致岩浆的产生，这些岩浆随后参与了持续的构造发育。由于调性岩体通常是在大陆边缘弧的增生过程中产生的，它们的成分提供了源区P-T-X - H2O条件的信息，并结合构造和构造数据，为岩浆在穿越和侵位地壳过程中可能导致化学修饰的搬运和侵位过程提供了约束。该项目将利用阿拉斯加东南部Revillagigedo岛上的一套调性岩体，这些岩体记录了大陆弧岩浆活动的早期阶段。研究结果有望详细描述和追踪这些岩浆在这一会聚背景下的起源、改造和构造相互作用。

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.