Collaborative Research: Testing Models that Describe the Origin of Compositional Diversity of Subduction Zone Magmatism, Aeolian Islands

合作研究：测试描述风神群岛俯冲带岩浆作用成分多样性起源的模型

• 批准号: 0810086
• 负责人: Wendy Bohrson
• 金额: $ 20.15万
• 依托单位: Central Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0810086&HistoricalAwards=false
• 关键词: Collaborative; Research; Testing; Models; Describe

Volcanic rocks provide an integrated, multi-scale record of the processes that govern how magmas form. Using both theoretical and analytical tools, this work will document the critical processes that led to the formation of magmas in the Aeolian Islands, Italy. The volcanoes of the Aeolians were chosen as the study sites because they are compositionally diverse and geologically young; they thus represent prime places to study to how and why young volcanoes erupt. In addition to augmenting our understanding of how these magmas form and evolve, this work will also help characterize features of this young magmatic system such as the depth at which the magma bodies reside under the surface of Earth and the volatile content of the magmas prior to eruption. Such data can provide information to volcanologists who explore when and how volcanic eruptions initiate, thereby potentially enhancing volcanic hazard assessment and mitigation. This work utilizes two approaches. One is application of a phase equilibria model, the development of which was funded by the National Science Foundation, to document the thermodynamics of processes that led to formation of magmas in the Aeolian Islands. Results of computer modeling allow predictions to be made about particular characteristics of the volcanic rocks. Using state-of-the-art analytical tools, these predictions will be tested by collecting geochemical, textural and field data on a selected suite of rocks. Comparison of theoretical expectations and these new data will allow the strengths and weaknesses of the phase equilibria model to be assessed and will also lead to well documented hypotheses about how the Aeolian volcanoes formed. If this marriage of state-of-the-art theoretical and analytical tools is successful, it will impact how scientists approach studying complex magmatic systems by providing a methodology by which source to surface compositional diversity can be understood. Because improvements to the phase equilibria model are an on-going goal, this work will also provide input that will inform model improvements.

火山岩提供了控制岩浆形式的过程的综合，多尺度记录。 使用理论和分析工具，这项工作将记录导致意大利风中岩浆形成的关键过程。人们选择了水山作为研究地点，因为它们在构图上是多样的和地质年轻的。因此，它们代表了研究年轻火山爆发的方式以及为什么爆发的主要场所。除了增强我们对这些岩浆形成和进化的理解外，这项工作还将有助于表征这种年轻的岩浆系统的特征，例如岩浆物体驻留在地球表面和喷发前岩浆的挥发性含量的深度。此类数据可以向探索火山喷发何时以及如何发射的火山学家提供信息，从而有可能增强火山危害评估和缓解。 这项工作采用了两种方法。一种是一种相位平衡模型的应用，该模型的发展是由国家科学基金会资助的，以记录导致风力的流程，这些过程导致了风力群岛的形成。计算机建模的结果允许对火山岩的特定特征进行预测。使用最先进的分析工具，将通过在选定的岩石套件上收集地球化学，纹理和现场数据来测试这些预测。理论期望和这些新数据的比较将允许评估阶段平衡模型的优势和劣势，并将导致关于风化的风山如何形成的充分记录的假设。如果最新的理论和分析工具的这种结婚成功，它将通过提供一种可以理解表面组成多样性来源的方法来影响研究复杂岩浆系统的科学家。由于改进阶段平衡模型是一个持续的目标，因此这项工作还将提供为改进模型的输入。