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 Smith 皮利山爆炸性和非爆炸性喷发模式的交替为研究挥发物与喷发机制之间的关系提供了一个极好的自然例子。 据此，本项目将对Smith和Roobol（1990a）的假设进行定量检验，该假设认为，对Pelee火山喷发方式的主要控制不是岩浆成分而是气体含量：富含挥发分的岩浆产生爆炸性的普林尼式活动，而挥发分较差的岩浆产生爆炸性的普林尼式活动。岩浆产生皮林活动。 这将通过使用微红外光谱以及电子和二次离子质谱显微镜（离子探针）测量幼年玻璃和斑晶中熔融包裹体的喷发前挥发物（H2O、CO2、Cl、F和S）的含量来实现皮利山的普林尼式和皮利式矿床。 将使用离子微探针测量痕量元素。 挥发物的演变和脱气历史将在基于主量和微量元素的分级结晶模型以及开放与封闭系统脱气模型的框架内进行解释。