Collaborative Research: Temporal and Spatial Variations of Magmatic Volatiles and Trace Elements in Glass Fragments and Phenocryst Inclusions in Pyroclastic Rocks...

合作研究：火山碎屑岩玻璃碎片和斑晶包裹体中岩浆挥发物和微量元素的时空变化...

• 批准号: 9527273
• 负责人: Alan Smith
• 金额: $ 9.15万
• 依托单位: University of Puerto Rico Mayaguez
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-03-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527273&HistoricalAwards=false
• 关键词: Collaborative; Research; Temporal; Spatial; Variations

9527273 Smith Alternation between explosive and non-explosive eruptive modes at Mt. Pelee provides an excellent natural example to study the relationship between volatiles and eruptive mechanism. Accordingly, this project will test quantitatively the hypothesis of Smith and Roobol (1990a), which state that the main control on eruptive style of Mt. Pelee is not magma composition but gas content: volatile-rich magma generate explosive Plinian activity and volatile-poor magma generates Pelean activity. This will be accomplished by measuring the contents of pre-eruptive volatiles (H2O, CO2, Cl, F, and S) using microinfrared spectroscopy and electron and secondary ion mass spectrometry microscopy (ion probe) on juvenile glasses and melt inclusions in phenocrysts from both Plinian and Pelean deposits of Mt. Pelee. Trace elements will be measured using an ion microprobe. The evolution and degassing history of the volatiles will be interpreted within a framework of fractional crystallization models based on major and trace elements and open versus closed system degassing models.

9527273史密斯山之间的爆炸性和非爆炸性喷发模式之间的交替提供了一个很好的自然例子，可以研究挥发物与喷发机制之间的关系。 因此，该项目将定量测试Smith and Roobol（1990a）的假设，该假设指出，Pelee山的喷发风格的主要控制不是岩浆成分，而是气体含量：富含挥发性的岩浆产生爆炸性的Plinian活性和Volatile-Poor Poor Magma Generaties Pelean Activations Pelean Activation。 这将通过使用微粉红外光谱和电子以及二级玻璃上的含量光谱显微镜（离子探针）测量少年和皮尔氏菌的融合物上的含量玻璃和融化夹杂物上的微型光谱光谱（离子探针）来测量爆发前挥发物（H2O，CO2，CL，F和S）的内容。 痕量元件将使用离子微探针测量。 挥发物的演变和脱气历史将在基于主要和痕量元素以及开放式系统脱气模型的分数结晶模型的框架内解释。