Collaborative Research: Hydrothermal System Response to Magma Supply and Crustal Thickness Gradients Along the Galapagos Spreading Center, 89.5-94W

合作研究：热液系统对加拉帕戈斯扩张中心沿线岩浆供应和地壳厚度梯度的响应，89.5-94W

• 批准号: 0326148
• 负责人: Scott White
• 金额: $ 7.76万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0326148&HistoricalAwards=false
• 关键词: Collaborative; Research; Hydrothermal; System; Response

The PIs will carry out a field experiment along the Galapagos Spreading Center (GSC) to investigate the response of the hydrothermal-geological-biological system along the ridge crest to large, hotspot-induced, along-strike gradients in magma supply and crustal thickness/structure. The GSC is known to exhibit increases in magma supply and crustal thickness toward the center of the Galapagos mantle plume (GMP) influence at 91.5 W, and is thus an ideal natural experiment on how magma supply and crustal thickness affect the nature, abundance, and distribution of ridge crest hydrothermal activity, and interactions between hydrothermal, volcanic, tectonic, and biological processes. Sonar, water-column, and visual surveys along the GSC, 89.5 W-94 W, are proposed to establish the distribution and nature of hydrothermal activity, and to test a variety of competing models. The field experiment will involve a one-leg interdisciplinary program of surveys and plume sampling (Leg 1: EM-300 sonar survey followed by DSL-120 sonar + autonomous plume sensor surveys, and CTD/rosette plume sampling.

研究所将沿着加拉帕戈斯扩散中心进行实地实验，以调查脊顶沿着的热液-地质-生物系统对热点引起的岩浆供应和地壳厚度/结构的大走向梯度的反应。已知GSC在91.5 W处向加拉帕戈斯地幔柱（GMP）影响的中心呈现岩浆供应和地壳厚度的增加，因此是一个理想的自然实验，研究岩浆供应和地壳厚度如何影响脊顶热液活动的性质、丰度和分布，以及热液、火山、构造和生物过程之间的相互作用。声纳，水柱，和视觉调查沿着GSC，89.5 W-94 W，建议建立热液活动的分布和性质，并测试各种竞争模型。现场实验将涉及一个单腿跨学科的调查和羽流采样方案（腿1：EM-300声纳调查，然后是DSL-120声纳+自主羽流传感器调查，以及CTD/玫瑰花羽流采样。