Collaborative Research: Time-Series Responses to a Mid- Ocean Ridge Volcanic Event: Juan de Fuca and Gorda Ridges

合作研究：对大洋中脊火山事件的时间序列响应：胡安德富卡和戈尔达海脊

• 批准号: 9902048
• 负责人: Stephen Giovannoni
• 金额: $ 2.06万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902048&HistoricalAwards=false
• 关键词: Collaborative; Research; Time; Series; Responses

Ridge axis diking/eruptive events are episodic perturbations that trigger a sequence of interrelated and rapidly evolving physical, chemical, and biological processes associated with the formation of ocean crust. Volcanic activity produces hydrothermal discharge with a distinct geochemical signature, and triggers specific geochemical and microbial responses in the adjuacent crust and overlying water-column. Observing and quantifying co-variation among related processes provides basic new constraints on presently immature models of submarine volcano-hydrothermal systems. Chemical and biological parameters within hydrothermal plumes change rapidly, with the steepest rate of change occurring over seconds to days following their discharge and subseuent mixing in the deep sea. Here we propose to mount comprehensive rapid and follow-up field responses to a remotely detected MOR volcanic event. Our project emphasizes time-series observations and experiments on key dynamic physical, geochemical, and geomicrobial properties of an evolving hydrothermal event plume. A rapid response to these events will allow us: (1) to obtain the initial flux--that unaffected by aging; (2) to study the chemical and biological evolution of hydrothermal event plumes, representing a natural, temporarily constrained experiment for monitoring transformations within hydrothermal effuents; (3) to exploit event plumes as an invaluable window to the subsurface biosphere.

海脊轴筑堤/喷发事件是一种幕式扰动，触发了与洋壳形成有关的一系列相互关联和迅速演变的物理、化学和生物过程。 火山活动产生的热液排放具有独特的地球化学特征，并触发特定的地球化学和微生物的反应，在辅助地壳和上覆水柱。 观测和量化相关过程之间的共变提供了基本的新的约束，目前不成熟的海底火山热液系统的模型。 热液羽流中的化学和生物参数变化迅速，在其排放和在深海中进行潜在混合后的几秒钟到几天内，变化率最大。 在这里，我们建议安装全面的快速和后续现场响应远程检测到的莫尔火山事件。 我们的项目强调时间序列观测和实验的关键动态物理，地球化学和地质微生物特性的不断发展的热液事件羽。 对这些事件的迅速反应将使我们能够：（1）获得不受老化影响的初始通量;（2）研究热液事件羽流的化学和生物演变，这是一种自然的、暂时受限制的实验，用于监测热液流出物内的变化;（3）利用事件羽流作为了解地下生物圈的宝贵窗口。