Hydrothermal Discharge along the Axis of the East Pacific Rise from 9 Degrees-10 Degrees N

沿东太平洋轴线的热液排放从北纬 9 度上升至 10 度

• 批准号: 8817658
• 负责人: Daniel Fornari
• 金额: $ 11.36万
• 依托单位: Columbia 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: 1989-03-15 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817658&HistoricalAwards=false
• 关键词: Hydrothermal; Discharge; along; Axis; East

Hydrothermal circulation at spreading centers is governed by the thermal regime and permeability structure of young ocean crust; thus, it is inextricably coupled to the volcano-tectonic processes along spreading centers. For virtually all spreading centers the interrelationships between hydrothermal, magmatic, and tectonic processes are poorly known because fine-scale mapping of the sea-floor has been restricted to very small segments of ridge crest. The present recommended award will rectify this situation for a major segment of the East Pacific Rise. Using the ARGO deep ocean search vehicle, the project will acquire both side-scan sonar and bottom photography from a one hundred mile long segment of this spreading center. This region has already been intensively studied using surface geological and geophysical techniques and the overall crustal structure is therefore well known. Objectives of the present project are: 1) to map the location of hydrothermal vents, 2) relate vent distribution to faulting and recent volcanic activity, and 3) determine the effect of ridge discontinuities on volcanic and hydrothermal activity. Data acquired during the survey will also be critical in locating sites for deep sea drilling to sample ocean crust.

扩张中心的热液循环受年轻洋壳的热状态和渗透性结构的控制；因此，它与沿扩张中心的火山构造过程密不可分。对于几乎所有的扩张中心来说，热液、岩浆和构造过程之间的相互关系鲜为人知，因为海底的精细尺度测绘仅限于山脊顶部的非常小的部分。目前推荐的奖励将纠正东太平洋隆起主要部分的这种情况。 该项目将使用 ARGO 深海搜索飞行器，从该扩张中心一百英里长的部分获取侧扫声纳和海底摄影。该地区已经利用地表地质和地球物理技术进行了深入研究，因此总体地壳结构是众所周知的。本项目的目标是：1）绘制热液喷口位置图，2）将热液喷口分布与断层和近期火山活动联系起来，3）确定山脊不连续性对火山和热液活动的影响。调查期间获得的数据对于确定深海钻探以采样洋壳的地点也至关重要。