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史密斯火山爆发模式与非爆发模式之间的交替。Pelee火山为研究挥发物与火山喷发机制的关系提供了一个很好的自然范例。 因此，本项目将定量地检验Smith和Roobol（1990 a）的假说，即火山喷发样式的主要控制因素是火山活动的控制因素。Pelee不是岩浆成分，而是气体含量：富挥发分的岩浆产生爆发性的普林尼活动，贫挥发分的岩浆产生Pelean活动。 这将通过测量喷发前挥发物（H2O，CO2，Cl，F和S）的含量，使用显微红外光谱和电子和二次离子质谱显微镜（离子探针）的少年玻璃和熔融包裹体斑晶从普林尼和Pelean山矿床。贝利 将使用离子微探针测量痕量元素。 挥发分的演化和脱气历史将被解释的主要和微量元素和开放与封闭系统脱气模型的基础上的分步结晶模型的框架内。