| 项目编号: | 1625017
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| 项目名称: | EAR-PF Determining links between magma redox heterogeneity in ocean island basalts and near-surface processes of the ancient and present day |
| 作者: | Mary Peterson
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| 承担单位: | Peterson Mary E
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| 批准年: | 2016
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| 开始日期: | 2016-10-01
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| 结束日期: | 2018-09-30
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| 资助金额: | 174000
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| 资助来源: | US-NSF
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| 项目类别: | Fellowship
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | magma
; oxidation state
; baffin island
; solid earth
; earth material
; micro x-ray absorption near-edge structure spectroscopy
; ocean island basalt
; shallow level process
; mid-ocean ridge
; magma redox
; solid earth redox
; surface redox condition
; measurement
; ocean island setting
; redox property
; mantle source
; nsf ear postdoctoral fellowship
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| 英文摘要: | Dr. Mary E. Peterson has been granted an NSF EAR Postdoctoral fellowship to carry out research and education activities at the California Institute of Technology. Magma generated in different tectonic settings has great geochemical variability, in some cases reflecting traces of ancient recycled material mixing with depleted upper mantle. This investigation will determine if the oxidation state of the mantle source for ocean island basalts is measurably different than either mid-ocean ridge or arc mantle sources. Understanding the oxidation state of the magma is important because it will allow scientists to discern the depth where mantle melting was initiated and what minerals may grow from the magma. The analytical scope for the project involves isolating a suite of well characterized glass and melt inclusions from lavas from three ocean island settings (the Galapagos Archipelago, Iceland and Baffin Island) to measure geochemical parameters that can be used to infer oxidation state of the mantle (for example, the ratio of ferric to total iron, oxygen isotopes, volatile and trace element concentrations). In addition, Dr. Peterson will develop and lead a graduate level seminar, open to students in geological science, materials science and chemistry to explore the geochemical implications of the oxidation state of Earth materials.
The data for this investigation will be collected using micro x-ray absorption near-edge structure spectroscopy (XANES) to measure Fe3+/total Fe ratios. These measurements will be combined with in situ secondary ionization mass spectrometry (SIMS) measurements of oxygen isotopes, volatile and trace elements, to determine if variations in Fe3+/total Fe ratios of the glass are due to shallow level processes or variability in the oxidation state of the mantle source. These measurements will build on preliminary data from the Galapagos while expanding to include the Iceland and Baffin Island. The results of this study will continue to grow the existing database of synchrotron measurements of Fe speciation in natural silicate glass in order to develop a basic understanding of the links between magma redox and plate tectonic cycling. By constraining the redox properties of mantle end-members, we can build a model for the evolution of solid Earth redox and inform existing models or hypotheses that link solid Earth and surface redox conditions in the past. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90896
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Mary Peterson. EAR-PF Determining links between magma redox heterogeneity in ocean island basalts and near-surface processes of the ancient and present day. 2016-01-01.
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