Causes of Compositional Variation in Historical Lavas from Kilauea Volcano, Hawaii

夏威夷基拉韦厄火山历史熔岩成分变化的原因

• 批准号: 9614247
• 负责人: Michael Garcia
• 金额: $ 12.35万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-15 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614247&HistoricalAwards=false
• 关键词: Causes; Compositional; Variation; Historical; Lavas

9614247 Garcia This is a proposal to continue work on the petrology and geochemistry of lavas from Kilauea volcano in Hawaii to improve our understanding of magmatic processes within active basaltic volcanoes. Recent work has documented large, systematic compositional variations within the historical lavas of this volcano (~200 years). The variation observed appears to be cyclic and correlated with summit explosions. The main purpose of this study will be to determine the cause of this compositional variation and to evaluate the relative importance of imputs from crustal and mantle processes. The working hypothesis is that the long-term geochemical cycle observed in Kilauea is caused by the dynamic melting of a heterogeneous plume source followed by mixing in the shallow summit magma reservoir. Inflections in the cycles occur when the summit reservoir is extensively drained during explosive events. Continuation of the study will allow the monitoring of the compositional variations in the ongoing Puu Oo eruption and the evaluation of the extent of crustal contamination in the Kilauea lavas. In addition, the proposed work will seek to provide insights into factors that may control the geochemical variation at Kilauea such as the role of explosive events, the relative effects of mantle heterogeneity and changes in the extent of partial melting and shape of melting regions.

9614247 Garcia这是一项提议，旨在继续从夏威夷基拉韦阿火山的岩石学和地球化学工作，以提高我们对活跃玄武岩火山中岩浆过程的理解。 最近的工作记录了这座火山历史熔岩（约200年）内的大型系统构图变化。 观察到的变异似乎是循环的，并且与峰顶爆炸相关。 这项研究的主要目的是确定这种组成变化的原因，并评估壳和地幔过程中弹药的相对重要性。工作假设是，在基拉尤（Kilauea）中观察到的长期地球化学循环是由异质羽流源的动态熔化引起的，然后在浅层山顶岩浆储层中混合。 当爆炸性事件中山顶储层广泛排干时，循环中的弯曲发生。 该研究的延续将允许监测正在进行的PUU OO爆发中的组成变化，并评估Kilauea熔岩中地壳污染的程度。 此外，拟议的工作将旨在提供有关可能控制基尔拉伊地球化学变化的因素，例如爆炸性事件的作用，地幔异质性的相对影响以及部分熔化程度的变化和融化区域的部分变化。