Geochemical and Dynamical Evolution of the Galapagos Hotspot

加拉帕戈斯热点的地球化学和动力学演化

• 批准号: 8911826
• 负责人: David Christie
• 金额: $ 30.31万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-11-15 至 1993-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911826&HistoricalAwards=false
• 关键词: Geochemical; Dynamical; Evolution; Galapagos; Hotspot

This is a project to continue the sampling and geochemical analysis of Galapagos lavas to the off-shore regions of the platform in order to define the nature of the Galapagos hotspot. Sampling, analysis and dating, combined with the analysis of gravity data, will permit the testing of the thermal entrainment of Mid-ocean Ridge basalt material into the center of the Galapagos plume. %%% One of the most interesting problems in understanding the geochemistry of rocks emplaced on the sea floor is the determine the nature of the interaction between processes that generate basaltic rocks that are found in a normal ocean ridge axis environment and process associated with deep seated hot spot plumes in the mantle. Preliminary study of rocks from the Galapagos platform show that rocks from the interior of the platform look like normal mid ocean ridge basalts, whereas those on the margins of the platform have compositions resembling plumes-type rocks. This rock sampling and analytical program will help test an interesting hypothesis developed by geophysicists regarding the dynamics of plumes that can give rise to the unusual geochemical signature. The personnel for this project are most appropriate because Dr. Christie has considerable experience at sea, Dr. McBirney has done considerable work on the Galapagos Islands, Dr. Richards has developed the hypothesis that is being tested. Drs. Duncan and White provide the necessary analytical expertise.

这是一个项目，继续采样和地球化学 分析加拉帕戈斯火山熔岩对印度洋沿岸地区的影响 平台，以确定加拉帕戈斯热点的性质。 取样、分析和测年，并结合 重力数据，将允许测试的热夹带 大洋中脊玄武岩物质的中心 加拉帕戈斯的羽毛。 %%% 在理解宇宙的过程中最有趣的问题之一 海底岩石的地球化学是决定 产生的过程之间相互作用的性质 在正常的洋脊轴上发现的玄武岩 与深部热点有关的环境和过程 地幔中的羽毛 岩石的初步研究 加拉帕戈斯地台表明， 平台看起来像正常洋中脊玄武岩，而那些 在平台的边缘有类似于 梅花型岩石 这个岩石取样和分析程序 将有助于测试一个有趣的假设， 地球物理学家们对羽流动力学的研究， 到 不寻常的地球化学特征 为此的人员 工程 最合适的，因为克里斯蒂博士有相当丰富的经验， 在 麦克伯尼博士在加拉帕戈斯群岛上做了大量的工作 岛屿， 理查兹博士提出了一个正在被验证的假设。 Drs. 邓肯和白色提供必要的分析专业知识。