Exploring Geological Activity Associated with Off-Axis Melt Sills near the East Pacific Rise

探索与东太平洋海隆附近离轴熔岩相关的地质活动

• 批准号: 1357726
• 负责人: Scott White
• 金额: $ 1万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1357726&HistoricalAwards=false
• 关键词: Exploring; Geological; Activity; Associated; Off

Two Alvin dives on the flank of the East Pacific Rise near 9°50'N will investigate the seafloor overlying the two largest crustal magma lenses detected by 3D multichannel seismic studies. At a distance of 5-7 km from the spreading axis, the results will document any recent faulting, flow, hydrothermal and associated biological activity across each hill. Changes as plate age increases, or along the faults bounding each hill will also be determined at each site. This information will be used to evaluate the role of off-axis magma in powering volcanic and hydrothermal activity. Post-cruise analysis will reconstruct the tectonic and volcanic history of the site using visual estimates of relative lava age and geologic contacts, radiometric dating of lava and sediment analysis for microbial activity.

在东太平洋海隆侧翼近9° 50 'N的两次阿尔文潜水将调查覆盖在3D多通道地震研究检测到的两个最大地壳岩浆透镜体上的海底。在距离扩张轴5-7公里处，结果将记录每座山丘上最近的断层、流动、热液和相关生物活动。随着板块年龄的增加，或沿沿着断层界定每个山丘的变化也将在每个地点确定。这些信息将用于评估离轴岩浆在推动火山和热液活动方面的作用。航行后分析将利用对相对熔岩年龄和地质接触的目测估计、熔岩放射性测年和沉积物微生物活动分析，重建该地点的构造和火山历史。