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..

这是一项对在俄罗斯远东堪察加半岛的三个与俯冲有关的火山中作为捕虏体发现的幔源岩的研究。 本研究中感兴趣的岩石类型是方辉橄榄岩和纯橄榄岩，它们被来自下行俯冲板块的含水流体或熔体进行了化学蚀变（交代），产生了毫米和厘米级的矿脉以及辉石和角闪石的矿化区或金云母在地幔中。 研究的目的是了解交代过程的性质及其与堪察加半岛和其他俯冲系统岩浆成因的关系。 该项目涉及收集各种地球化学数据，包括几个气相和轻元素同位素系统（3 He/4 He，3 He/CO2，13 C，18 O，D）以及重元素同位素比率（Sr，Nd，Pb和Hf），这些数据在我们理解俯冲交代过程中起着关键作用。微量元素分析将通过ICPMS对全岩和矿物溶液进行。 这些数据将通过对某些高场强元素（Ta、Nb、Zr和Hf）浓度的高精度同位素稀释测量得到补充。 来自罗切斯特大学和南卡罗来纳州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。 这是罗切斯特大学和南卡罗来纳州大学在国内以及在国际上与俄罗斯堪察加彼得罗巴甫洛夫斯克的俄罗斯火山地质和地球化学研究所合作的一个项目。