Collaborative Research: Genesis of Primitive, High-Sr Lavas in the Western Aleutians

合作研究：西阿留申群岛原始高锶熔岩的起源

• 批准号: 0728077
• 负责人: Gene Yogodzinski
• 金额: --
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0728077&HistoricalAwards=false
• 关键词: Collaborative; Research; Genesis; Primitive; Sr

Intellectual Merit: This research is a four-institution collaboration that supports geochemical studies of volcanic rocks collected by dredging volcanic the western Aleutian seafloor during a cruise carried out in July-August 2005. Preliminary results show that the rocks contain a large proportion of primitive lavas that include not only basalts, but also andesites and dacites with unusual trace element compositions. Goals of the project are to analyze 100 of these samples and use the data to model the petrological and geochemical processes leading to their genesis and evolution and placing these results in the context of subduction zone magmatic processes. Analytical efforts will focus on whole-rock geochemistry including major and trace elements, determine Pb, Sr, Nd and Hf isotopic ratios on a subset of the 100 samples, carry out electron microprobe studies of phenocrysts and glass inclusions in some of the freshest glass-containing lavas, and use the ion probe to determine trace element compositions of pyroxene phenocrysts and glass inclusions hosted by olivine and pyroxene. A small, no-cost pilot study of volatile and light elements in glass inclusions will be carried out by a collaborator at the Carnegie Institution of Washington. Broader Impacts: This research involved collaboration between four institutions and will support a PhD student and undergraduates at a university in South Carolina, which is an EPSCoR state. The project also engages a new investigator in ocean science. Geochemical analyses will support shared use analytical facilities thereby helping sustain the infrastructure for science. Data will be archived and made available to the public on well know geochemical databases, including GeoRock and PetDB.

智力成果：这项研究是四家机构合作进行的，支持对 2005 年 7 月至 8 月航行期间在阿留申群岛西部海底疏浚火山所收集的火山岩进行地球化学研究。初步结果表明，这些岩石含有很大比例的原始熔岩。其中不仅包括玄武岩，还包括具有不寻常微量元素成分的安山岩和英安岩。该项目的目标是分析其中 100 个样本，并使用这些数据对导致其形成和演化的岩石学和地球化学过程进行建模，并将这些结果置于俯冲带岩浆过程的背景下。 分析工作将集中于包括主量元素和微量元素在内的全岩石地球化学，确定 100 个样品子集的 Pb、Sr、Nd 和 Hf 同位素比，对一些最新鲜的玻璃中的斑晶和玻璃夹杂物进行电子显微探针研究。含有熔岩，并使用离子探针测定橄榄石和辉石所含辉石斑晶和玻璃包裹体的微量元素组成。华盛顿卡内基研究所的合作者将针对玻璃夹杂物中的挥发性元素和轻元素进行小型、免费的试点研究。更广泛的影响：这项研究涉及四个机构之间的合作，将为南卡罗来纳州（EPSCoR 州）一所大学的一名博士生和本科生提供支持。 该项目还聘请了一位新的海洋科学研究员。 地球化学分析将支持共享分析设施，从而帮助维持科学基础设施。 数据将被存档并在众所周知的地球化学数据库（包括 GeoRock 和 PetDB）上向公众开放。