Processed multichannel seismic data along the Galapagos Spreading Center at 91.3W - 95.5W, acquired during the R/V Maurice Ewing survey EW0004 (2000)

Part of the Galapagos Plume-Ridge Interaction Multidisciplinary Experiment (G-Prime), this MCS-OBS survey characterized in detail the oceanic created along the Galapagos Spreading Center at 91.3W - 95.5W. The objectives of the project were to: (1) determine how the compensation of the Galapagos swell is partitioned between variations in crustal thickness and mangle density by measuring crustal thickness along the swell and the degree of melting inferred from the chemistry of basalts, (2) determine if there is a threshold factor that controls the transition from an axial high to a rift valley, (3) determine how the extent of magmatic differentiation of ridge basalts relates to the presence or absence of a melt lens, and (4) determine why the degree of partial melting appears to be lower near the hotspot. Funded by NSF grants OCE98-18632, OCE98-19117, and OCE98-18886.

本项研究作为加那利海隆-裂谷相互作用多学科实验（G-Prime）的一部分，对加那利海扩张中心（91.3W-95.5W）沿线所形成的海洋结构进行了详细表征。项目旨在：（1）通过测量涌动带内的地壳厚度以及由玄武岩化学性质推断出的熔融程度，确定加那利涌动的补偿如何在地壳厚度和杂岩密度变化之间分配；（2）探究是否存在一个阈值因素，该因素控制着从轴部高地向裂谷的过渡；（3）分析海山玄武岩的岩浆分异程度与熔融透镜的有无之间的关系；（4）探究为何在热点附近部分熔融的程度似乎较低。本研究项目由美国国家科学基金会（NSF）资助，资助编号分别为OCE98-18632、OCE98-19117和OCE98-18886。