Collaborative Research: Investigating the Relationship Between Pluton Growth and Volcanism at Two Active Intrusions in the Central Andes

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。我们对地壳岩浆房是如何演化的，以及这些岩浆房与岩体和火山喷发之间的关系的了解是不充分的，主要是因为还没有人对活跃的地壳岩浆房进行过全面的研究。该项目提供了一个独特的机会，将为地壳深部岩浆的产生、储存和分化提供全新的见解。ppi利用可能导致火成岩喷发的早期阶段设计了这个项目。考虑到从未观察到大规模的火成岩喷发，更不用说积聚了，这可能是几代人只有一次的机会。该项目建立在最近的InSAR结果的基础上，该结果显示了位于安第斯山脉中部几座火山上方的大规模快速隆起。这项研究的重点是确定岩浆库的位置、大小和形状，以及它们的填充速度。InSAR、GPS大地测量和微重力测量相结合将提供当前岩浆通量的基本数据。河流地貌学将用于估计较长时间内的抬升速率。地震和大地电磁研究将提供关于任何岩浆房位置和大小的独立信息。岩浆在地壳中运移的机制对许多问题都非常重要，从岩浆形成地壳的方式到火山爆发的基本危险预测。在建造大型中地壳岩浆库的过程中对其进行研究是促进我们对这一问题理解的最佳途径，而本提案中的跨学科方法是关键。该项目包括与英国布里斯托尔大学的科学家密切合作，这些科学家由NERC资助，并与智利、阿根廷和玻利维亚的研究小组密切合作。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Our knowledge of how crustal magma chambers evolve and how these magma chambers relate to plutons and eruptions is inadequate, largely because nobody has yet conducted a comprehensive study of an active crustal magma chamber. This project provides a unique opportunity to do so and will provide fundamentally new insights into deep crustal magma generation, storage, and differentiation. The PIs have designed the project taking advantage of what may be the early stages leading up to an ignimbrite eruption. Given that a large ignimbrite eruption has never been observed, let alone the build-up to one, this might be a once in a many-generation opportunity. The project builds on recent InSAR results that show large-scale rapid uplift situated over several volcanoes in the Central Andes. The research is focused on resolving the location, size, and shape of the magma chambers, and the rates at which they are filling. The combination of InSAR, GPS geodesy, and microgravity measurements will provide the essential data for magma fluxes at present. Fluvial geomorphology will be used to estimate uplift rates over a longer time. Seismic and magnetotelluric studies will provide independent information about the location and size of any magma chamber. The mechanism of magma transport through the crust is very important for a number of issues ranging from the manner of crust formation via magma addition to basic hazard predictions for volcanic eruptions. Investigating the development of a large mid-crustal magma chamber while it is being built is the best way to advance our understanding of this issue and the interdisciplinary approach in this proposal is key. The project includes close collaboration with scientists from the University of Bristol (UK) who are funded by NERC and with research groups in Chile, Argentina and Bolivia.