Collaborative Research: The Geodynamics of the Andean Southern Volcanic Zone, A Geochemical Approach

合作研究：安第斯山脉南部火山带的地球动力学，地球化学方法

• 批准号: 0810191
• 负责人: Alberto Saal
• 金额: $ 23.41万
• 依托单位: Brown 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=0810191&HistoricalAwards=false
• 关键词: Collaborative; Research; Geodynamics; Andean; Southern

Intellectual merit. Knowledge of the distribution and composition of the chemical components associated with convergent margin magmatism is a fundamental requirement for understanding the origin, composition and evolution of the continental crust and the heterogeneity of the mantle. Establishing the budget and distribution of volatiles in the mantle at convergent margins is a necessary step to understand the processes responsible for the generation of arc volcanoes. Volatiles influence mantle melting, magma crystallization and volcanic eruption, and their abundances and spatial distribution provide important constraints on models of mantle flow, slab dehydration and crustal recycling. Over the last 30 years, the Andes Southern Volcanic Zone (SVZ) has been extensively investigated, with geochemical, petrological, geophysical, tectonic and geological studies providing important information on the composition of the magmatic arc, and the structure and evolution of the crust and mantle. However, data on volatile concentration and stable isotopic composition of lavas from the SVZ are virtually nonexistent.This project aims to fill this gap by determining regional variations in volatile contents and isotopic composition in selected SVZ basalts. The new data will help us build a more integrated and realistic portrait of the inner-workings at convergence margins in continental environments. They will be used to discriminate sources of volatiles (e.g., slab dehydration vs. subducted sediments) and to test models of slab-flux versus decompression melting. Combination of the existing seismic information, and two-dimensional temperature and flow models with the geochemical data will provide a more reliable representation of the mantle flow, melt production, migration, and extent of the mantle hydration beneath the SVZ.Broader Impact. This project will promote collaboration between geophysicists, geochemists and geodynamicists from six domestic (Brown U., DTM, FIU, Cornell U., CWRU, WHOI) and five foreign institutions (U. Cordoba, Argentina; U. Concepcion, Chile; IFM-GEOMAR and GFZ-Postdam, Germany; Okoyama U., Japan). These collaborations will allow cross-fertilization that will benefit all scientists involved, where the sharing of samples, data, models and ideas will flow freely between the parties. Three laboratories: the Eprobe at Brown U., the ion-probe at DTM-CIW, and the ICPMS-labs at WHOI will be financially supported by this research. The project will support one PhD student and several undergraduates from Brown University and undergraduates from University of Cordoba. We anticipate several senior theses from both institutions. Thus, research on recent Andean volcanism will be represented for the first time in the Geology Department at the Universidad de Cordoba.

智力优点。了解与收敛边缘岩浆作用相关的化学成分的分布和组成是理解大陆地壳和地幔异质性的起源，组成和进化的基本要求。在收敛利润率上建立在地幔中挥发物的预算和分配是了解负责产生弧火山的过程的必要步骤。挥发物影响地幔熔化，岩浆结晶和火山喷发，它们的丰度和空间分布对地幔流，板脱水和地壳回收的模型提供了重要的限制。在过去的30年中，对安第斯山脉南部火山区（SVZ）进行了广泛的研究，并通过地球化学，岩石学，地球物理，构造和地质研究提供了有关岩浆弧组成的重要信息，以及地壳和地幔的结构和演变。但是，SVZ的熔岩的挥发性浓度和稳定的同位素组成的数据几乎不存在。该项目旨在通过确定所选SVZ底层中挥发性含量和同位素组成的区域变化来填补这一空白。新数据将帮助我们在大陆环境中对内部工作的内部工作构建更加整合和现实的肖像。它们将用于区分挥发物的来源（例如，平板脱水与俯冲沉积物），并测试平板液和减压熔化的模型。现有的地震信息以及二维温度和流量模型与地球化学数据的结合将提供更可靠的代表，即在SVZ.BROADER IMPACT下的地幔流量，融化产生，迁移和地幔水合的范围。 This project will promote collaboration between geophysicists, geochemists and geodynamicists from six domestic (Brown U., DTM, FIU, Cornell U., CWRU, WHOI) and five foreign institutions (U. Cordoba, Argentina; U. Concepcion, Chile; IFM-GEOMAR and GFZ-Postdam, Germany; Okoyama U., Japan).这些合作将允许交叉利用使所有相关的科学家受益，在当事方之间共享样本，数据，模型和想法的共享。三个实验室：Brown U.的EPROBE，DTM-CIW的离子探针，以及WHOI的ICPMS-LABS将得到这项研究的财务支持。该项目将支持布朗大学的一名博士生和几名大学生和科尔多瓦大学的本科生。我们预计这两个机构都会有几个高级论文。因此，对最近的安第斯山脉火山主义的研究将首次在科尔多瓦大学的地质系中代表。