Collaborative Research: A Seismic and Petrologic Investigation of the Effects of Plume-Ridge Interaction along the Galapagos Spreading Center

该项目是一个综合的野外和实验室项目，涉及沿加拉帕戈斯群岛西经91度至98度之间800公里长的扩散中心区域进行地震、岩石学和理论建模研究。该项目的目标是：(1)通过测量沿膨胀的地壳厚度和从玄武岩化学中推断出的熔融程度，确定加拉帕戈斯膨胀的补偿是如何在地壳厚度和地幔密度的变化之间划分的；(2)确定是否存在一个阈值因素控制着从轴向高地向裂谷的过渡；(3)确定山脊玄武岩的岩浆分选程度如何与熔体透镜的存在与否相关。(4)确定热点附近部分熔化程度较低的原因。

This project is a comprehensive field and laboratory program that involves coordinated seismic, petrologic and theoretical modeling studies along an 800-km-long section of the Galapagos spreading center between 91 and 98 degrees west. The objectives of the project are 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.