Periodicity of Volcanism and Hydrothermal Activity on the Gorda Ridge

戈尔达山脊火山活动和热液活动的周期性

• 批准号: 8818196
• 负责人: Martin Fisk
• 金额: $ 3.55万
• 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: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1990-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8818196&HistoricalAwards=false
• 关键词: Periodicity; Volcanism; Hydrothermal; Activity; Gorda

The Gorda Ridge is part of the global system of mid-ocean ridges along which new ocean floor is created. The southern third of the ridge extends for a length of about 120 km off the northern California coast and is characterized by a deep axial valley covered by thick sediment fill. At least five volcanic centers rise above this sediment cover at an average spacing of 15 km. These volcanoes provide a unique opportunity to study the frequency of volcanic activity at mid-ocean ridges, since the products of this volcanism should be recorded in the accumulating sediment. The present project will use a set of previously collected cores from this area to examine the episodicity of discrete volcanic events and the chemical evolution of discrete magmatic centers in the rift valley.

戈尔达岭是全球大洋中脊系统的一部分，新的海底就是沿着这个系统形成的。海脊的南部三分之一延伸到距离加州北部海岸约120公里的地方，其特点是有一个深的轴向山谷，上面覆盖着厚厚的沉积物。至少有五个火山中心以平均15公里的间隔从这一沉积物覆盖层上方升起。这些火山为研究大洋中脊火山活动的频率提供了一个独特的机会，因为这种火山活动的产物应该记录在累积的沉积物中。本项目将使用以前从该地区收集的一组岩芯来检查离散火山事件的偶然性和裂谷中离散岩浆中心的化学演化。