| 项目编号: | 1455432
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| 项目名称: | Fluid-mobile and volatile element (Cl, B, and Li) cycling through the forearc: Case study of cold and thermal spring geochemistries from the Hikurangi accretionary prism, New Zeala |
| 作者: | Jaime Barnes
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| 承担单位: | University of Texas at Austin
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| 批准年: | 2016
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| 开始日期: | 2016-01-01
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| 结束日期: | 2018-12-31
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| 资助金额: | 247499
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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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: | fore-arc
; fluid source
; subduction zone
; fluid
; slab
; seismic slip behavior
; shallow slow slip event
; elemental concentration
; earthquake behavior
; causal link
; particular element
; hikurangi margin
; thermal spring water
; accretionary prism
; subduction parameter
; fore-arc spring
; buoyant plate
; arc variability
; ideal locality
; rare glimpse
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| 英文摘要: | A subduction zone is an area where two tectonic plates collide and the denser plate (also called a subducting slab, consisting of seafloor sediments, oceanic crust, and underlying mantle) is forced to sink into the mantle beneath the more buoyant plate. Hydrous minerals in the slab break down when exposed to the high temperatures encountered at depth, releasing fluids ultimately involved in the creation of arc magmas and explosive arc volcanoes. In addition, these fluids are also thought to influence seismic slip behavior and the manifestation of earthquakes. Therefore, determining the sources and amount of fluids released at depth within a subduction is critical for understanding volcanic and earthquake behavior along plate margins.
Particular elements (for example, lithium, chlorine, and boron) are highly fluid-mobile, thereby making them excellent tracers of fluid source. These fluids impart diagnostic geochemical signatures to overlying material that can be used to trace mass transfer through subduction zones. This work will geochemically characterize cold and thermal spring waters from the Hikurangi (New Zealand subduction zone) accretionary prism to trace fluid sources along the fore-arc and quantify volatile flux through the fore-arc. Fluid sources to the fore-arc will be determined by examining variations in elemental concentrations (and ratios) and isotopic compositions. The data will be used to evaluate causal links between fluid sources and earthquake mechanics, such as shallow slow slip events. The Hikurangi margin is the ideal locality for this study due to the numerous exposed fore-arc springs, which allow a rare glimpse into the shallow part of the subduction zone, and the previously documented along arc variability in subduction parameters (e.g., amount of subducting sediment) and seismic slip behavior. Geochemical evidence for increased (or more shallow) dehydration reactions in the northern portion of the margin compared to the southern portion would support a link between dehydration reactions and shallow slow slip events. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92984
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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: | |
Jaime Barnes. Fluid-mobile and volatile element (Cl, B, and Li) cycling through the forearc: Case study of cold and thermal spring geochemistries from the Hikurangi accretionary prism, New Zeala. 2016-01-01.
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