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

pi将沿着加拉帕戈斯扩张中心（GSC）进行实地实验，研究沿脊顶的热液-地质-生物系统对岩浆供应和地壳厚度/结构的大、热点诱发的沿走向梯度的响应。已知GSC在91.5 W向加拉帕戈斯地幔柱（GMP）影响中心方向表现出岩浆供应和地壳厚度的增加，因此是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相互作用的理想自然实验。建议沿89.5 W-94 W的GSC进行声纳、水柱和目视调查，以确定热液活动的分布和性质，并测试各种相互竞争的模型。现场实验将包括一个跨学科的调查和羽流采样项目（第一阶段：EM-300声纳调查，随后是DSL-120声纳+自主羽流传感器调查，以及CTD/玫瑰羽流采样）。

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.