Collaborative Research: Experimental Investigation of Magmatic Processes at Volcan Quizapu

火山喷发发生在沿着俯冲带（弧）通常被解释为触发的新岩浆流入其浅的存储系统。该项目旨在通过测试喷发物质的结构和成分保持这一年表的前提，探索它们携带的“水晶货物”上的温度、压力、水含量和弧岩浆成分的后期变化。实验和天然样品的比较将揭示岩浆房和过渡过程之间发生的岩浆混合和emulsion.Two历史喷发的火山基萨普（智利安第斯山脉），一个喷出和一个爆炸，已在先前的研究岩石学和地球化学的特点。 有证据表明，这是一个以英安岩为主的岩浆系统，具有单幕喷发触发的安山质岩浆流入。 这些相互作用的相对简单性使得Quizapu成为一个理想的起点，可以进行有针对性的实验研究，解决与岩浆混合和上升/喷发有关的问题。 调查的关键线包括约束再吸收/去稳定动力学的斜长石和角闪石在扰动的反应，因为这些矿物保存证据的岩浆储存条件喷发前。本研究的目的是（1）建立Quizapu英安岩和安山岩喷发前的环境条件，（2）检查关键的温压计和湿度计的响应时间，通过一系列的步进加热实验，（3）探索筛状结构斜长石的形成条件，和（4）通过高分辨率的化学分析和扩散模拟广泛检查晶体尺度的热力学扰动的响应。 这些结果将对中间成分弧岩浆的岩浆混合过程产生普遍影响，不仅因为再充触发的Quizapu事件是典型的弧火山事件，而且因为研究重点关注的晶体尺度过程卤素对角闪石组成和稳定性的影响，加热时斜长石溶解动力学，以及通过几种提出的机制形成筛状结构）与广泛的岩浆环境有密切关系。

Volcanic eruptions taking place along subduction zones (arcs) are commonly interpreted as triggered by the influx of new magma to their shallow storage systems. This project aims to explore the late-stage changes in temperature, pressure, water content, and composition of arc magmas on the "crystal cargo" they carry, by testing the premise that the textures and compositions of erupted materials preserve this chronology. Comparison of experimental and natural samples will shed light on magma chamber and transit processes occurring between magma mixing and eruption.Two historical eruptions of Volcan Quizapu (Chilean Andes), one effusive and one explosive, have been characterized petrologically and geochemically in prior studies. Evidence points to a magmatic system of predominantly dacite with single-episode, eruption-triggering influxes of andesitic magma. The relative simplicity of these interactions makes Quizapu an ideal starting point for a targeted experimental study addressing questions related to magma mixing and ascent/eruption. Key lines of inquiry include constraining resorption/de-stabilization kinetics of plagioclase and amphibole in response to perturbation, as these minerals preserve evidence of magma storage conditions prior to eruption. The goals of this investigation are to (1) establish pre-eruption environmental conditions of Quizapu dacite and andesite, (2) examine response times of key thermobarometers and hygrometers through a series of step-heating experiments, (3) explore the formation conditions of sieve-textured plagioclase, and (4) broadly examine crystal-scale responses to thermodynamic perturbations through high-resolution chemical analysis and diffusion modeling. The results will have general implications for magma mixing processes among intermediate-composition arc magmas, not only because the recharge-triggered Quizapu events are typical of arc volcanoes, but also because the crystal-scale processes on which the study focuses (the influence of halogens on amphibole composition and stability, plagioclase dissolution kinetics upon heating, and formation of sieve-texture via several proposed mechanisms) are germane to a broad spectrum of magmatic settings.