Collaborative Research: Geochemistry of Ultramafic Xenoliths From the Mantle Wedge of the Kamchatka Arc

合作研究：堪察加弧地幔楔超镁铁质包体的地球化学

• 批准号: 0310185
• 负责人: Asish Basu
• 金额: $ 12.66万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0310185&HistoricalAwards=false
• 关键词: Collaborative; Research; Geochemistry; Ultramafic; Xenoliths

This is a study of mantle-derived rocks found as xenoliths in three subduction-related volcanoes located on the Kamchatka Peninsula in the Russian Far East. The rock types of interest in this study are harzburgites and dunites that have been chemically altered (metasomatized) by hydrous fluids or melts derived from the down-going subducted plate, which produced millimeter and centimeter-scale veins and mineralized zones of pyroxene and amphibole or phlogopite in the mantle. The objective of the study is to understand the nature of the metasomatic process and its relationship to magma genesis in Kamchatka and other subduction systems. The project involves the collection of diverse geochemical data, including several of the gas-phase and light-element isotope systems (3He/4He, 3He/CO2, 13C, 18O, D) as well as heavy-element isotope ratios (Sr, Nd, Pb and Hf) that play a key role in our understanding of subduction-metasomatic processes. Trace element analyses will be done by ICPMS on whole-rock and mineral solutions. These data will be augmented by high-precision, isotope-dilution measurements of some high field strength element (Ta, Nb, Zr and Hf) concentrations. Graduate and undergraduate students from the University of Rochester and the University of South Carolina will be involved in all aspects of the data collection and interpretation. This is a collaborative project, domestically, between the University of Rochester and the University of South Carolina and, internationally, with the Russian Institute of Volcanic Geology and Geochemistry, in Petropavlovsk, Kamchatka, Russia..

这是对地幔衍生的岩石的研究，该岩石是在俄罗斯远东的坎奇特卡半岛上的三个与俯冲相关的火山中发现的异种石。 这项研究中兴趣的岩石类型是Harzburgites和Dunites，它们已通过含水液或熔体衍生而成的化学改变（变交），这些板源自下降的俯冲板，它们产生了毫米和厘米尺度的静脉，以及辉高烯和Amphibole或Amphibole或Phlogogopite的矿化区域。 这项研究的目的是了解kamchatka和其他俯冲系统中的分类过程的性质及其与岩浆起源的关系。 该项目涉及收集各种地球化学数据，包括几种气相和光同位素系统（3HE/4HE，3HE/CO2、13C，13C，18O，D）以及重元素同位素比（SR，ND，ND，PB和HF）在我们对我们对分子的理解中起着关键作用。痕量元素分析将通过ICPM在全岩和矿物溶液上进行。 这些数据将通过某些高场强元素（TA，NB，ZR和HF）浓度的高精度，同位素稀释测量来增强。 罗切斯特大学和南卡罗来纳大学的研究生和本科生将参与数据收集和解释的各个方面。 从国内，这是罗切斯特大学和南卡罗来纳大学之间的一个合作项目，在国际上，与俄罗斯火山地质与地球化学研究所在俄罗斯，俄罗斯，俄罗斯，俄罗斯，俄罗斯，俄罗斯。