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

9600029狄克逊火山爆发模式与非爆发模式的交替。Pelee为研究挥发分与喷发机理的关系提供了一个很好的天然范例。因此，本项目将定量检验Smith和Roobol(1990a)的假说，该假说认为对山体喷发样式的主要控制。Pelee不是岩浆成分，而是气体含量：富挥发分的岩浆产生爆炸性的普林斯活动，而挥发分贫化的岩浆产生Plean活动。这将通过使用显微红外光谱、电子和二次离子质谱仪(离子探针)测量喷发前挥发物(H2O、CO_2、Cl、F和S)的含量来实现。佩里。痕量元素将使用离子微探针进行测量。挥发物的演化和脱气历史将在基于常量和微量元素的分离结晶模型以及开放和封闭系统脱气模型的框架内进行解释。

9600029 Dixon 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.