Structure of Active Fumarole Fields: An Integrated Geophysical and Geochemical Approach

活跃喷气孔场的结构：综合地球物理和地球化学方法

• 批准号: 9206048
• 负责人: Charles Connor
• 金额: --
• 依托单位: Florida International University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206048&HistoricalAwards=false
• 关键词: Structure; Active; Fumarole; Fields; Integrated

Physical models of flow in medium- and high-temperature fumarole fields suggest that mass flow will exert a strong control on fumarole temperature in most circumstances. The PIs plan to monitor temperature and mass flow continuously to test this relationship in three active fields. These fields are on Volcano Colima, Mexico, Poas, Costa Rica, and Galeras, Colombia, and encompass a range of hydrothermal regimes. At Galeras, young fumaroles are likely a manifestation of forced convection of magmatic and deeply circulating meteoritic fluids. At Poas, shallow free convection likely dominates flow. Colima represents a flow regime intermediate between the other two. The time scales and interdependence of temperature, mass flow, and geochemistry will vary between these systems. Geochemical data, particularly stable and cosmogenic isotopes, will help distinguish more clearly between shallow free convection and fumaroles fed by forced convection from relatively deep or magmatic sources. Differentiation of these transport mechanisms is important to the understanding and interpretation of observed changes in fumarole activity at active volcanoes.

中和高温富马罗场中流动的物理模型表明，在大多数情况下，质量流对富马罗温度会产生强大的控制。 PI计划不断监测温度和质量流，以在三个活动场中测试这种关系。这些领域位于墨西哥火山，墨西哥，哥斯达黎加和哥伦比亚的哥伦比亚，涵盖了一系列的水热政权。在Galeras，年轻的富马尔可能是强迫对流的岩浆和深度循环的陨石流体的表现。在POA，浅的自由对流可能主导流动。 Colima代表其他两个之间的流动状态。这些系统之间的时间尺度和温度，质量流量和地球化学的相互依赖性将有所不同。地球化学数据，尤其是稳定和宇宙同位素，将有助于更清楚地区分浅的自由对流和通过强迫对流与相对较深或岩浆的来源喂养的富马物。这些运输机制的分化对于对活跃火山富马罗活动的观察到的变化的理解和解释很重要。