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

PIS将沿着加拉帕戈斯扩展中心(GSC)进行实地实验，以调查沿山脊的热液-地质-生物系统对岩浆供应和地壳厚度/结构中大的热点诱导的沿走向梯度的响应。众所周知，GSC在91.5W向加拉帕戈斯地幔热柱(GMP)影响的中心增加了岩浆供应和地壳厚度，因此是一个理想的自然实验，研究了岩浆供应和地壳厚度如何影响山脊热液活动的性质、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。为确定热液活动的分布和性质，建议沿GSC进行声纳、水柱和目视观测，以确定各种相互竞争的模型。实地实验将涉及一项调查和羽流采样的跨学科方案(第1段：EM-300声纳测量，然后是DSL-120声纳+自主羽流传感器测量，以及CTD/玫瑰花羽流采样。

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.