EAPSI:Resolving sources of volcanic and hydrothermal gases from the North Island of New Zealand

EAPSI：解决新西兰北岛火山和热液气体的来源

• 批准号: 1514801
• 负责人: Brian House
• 金额: $ 0.51万
• 依托单位: House Brian M
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1514801&HistoricalAwards=false
• 关键词: EAPSI; Resolving; sources; volcanic; hydrothermal

While volatile elements like carbon are returned to the deep Earth at convergent tectonic margins like the Hikurangi Margin off the coast of New Zealand?s North Island, some carbon in marine sediments is released through volcanic and hydrothermal activity. Geologic cycling of carbon ? both at settings like the Hikurangi Margin and globally ? is poorly understood and must be clarified to evaluate anthropogenic effects on the carbon budget. This award supports the first concerted volatile sampling and analysis campaign aimed at elucidating where, relative to the Hikurangi Trench, slab-derived C is first detected in geothermal systems and how the extent of C release changes with distance from the trench. Field sampling and analysis will be conducted in collaboration with Dr. Bruce Christenson of GNS Science, New Zealand.In addition to the overall carbon cycling budget, the sampling that will be conducted in the fore-arc, volcanic center (the Taupo Volcanic Zone), and back-arc regions of the North Island will be used to constrain cycling and devolatilization potential of various carbon, nitrogen, and helium reservoirs at different depths along the subducting slab. Fore- and back-arc devolatilization processes are poorly understood, as are the particular geochemical reactions responsible for volatile release and the potential for carbonate in altered oceanic crust to contribute to carbon fluxes. New volcanic, hydrothermal, and rock samples will enable more complete thermodynamic modeling of subduction zones, with local as well as global implications. Comprehensive sampling and analysis will also permit refinement of standard models used to distinguish sources of volatiles released at subduction zones. This award is funded in collaboration with the Royal Society of New Zealand.

虽然像碳这样的挥发性元素在会聚的构造边缘返回地球深处，如新西兰S北岛海岸外的希库兰吉边缘，但海洋沉积物中的一些碳通过火山和热液活动释放。碳的地质循环？无论是在Hikurangi边缘还是在全球范围内？人们对此知之甚少，必须加以澄清，以评估人类活动对碳收支的影响。该奖项支持第一次协调一致的挥发性采样和分析活动，旨在阐明相对于Hikurangi海沟，地热系统中首先检测到板材衍生的C，以及C的释放程度如何随距离海沟的距离而变化。现场采样和分析将与新西兰GNS Science的Bruce Christenson博士合作进行。除了总体碳循环预算外，将在北岛的弧前、火山中心(陶波火山带)和弧后区域进行采样，以限制俯冲板块沿线不同深度的各种碳、氮和氦储量的循环和挥发潜力。人们对弧前和弧后的挥发分释放过程知之甚少，对导致挥发分释放的特殊地球化学反应以及蚀变洋壳中的碳酸盐对碳通量的贡献也知之甚少。新的火山、热液和岩石样品将能够对俯冲带进行更完整的热力学模拟，具有局部和全球意义。全面的采样和分析还将允许改进用于区分在俯冲区释放的挥发物来源的标准模型。该奖项是与新西兰皇家学会合作资助的。