Segment-Scale Melt Storage and Transport Processes at Mediumto Fast-Spreading Ridges: Case Study at the EPR, 9 Degrees 30' Norh Area

岩浆的储存和运输过程下的轴活动 中度到快速扩张的脊对于 理解脊分割和动态行为， 轴向火山 详细的岩石学和地球化学研究 经过充分研究和采样的山脊段可以提供 对这些的性质和几何形状的强约束 流程. 本项目将分析微量元素、矿物质 化学和晶体尺寸分布数据来自东方 北纬9度20分至9度53分之间的太平洋海隆 以测试岩浆运输模型和岩浆 腔室工艺 大洋中脊火山作用的一种模式 认为火山活动是深层上升流的结果 向上退化为多个底辟和导管。 在浅层，岩浆显然经历了分馏， 岩石是从高温熔体中结晶出来的， 脊顶高点和岩石结晶形成低温 在山脊的最低处发现了融化。 该模型将由 将大量疏浚物的分析与计算结果进行比较 岩石成分的变化， 一个或多个母岩浆的分馏作用。

Magma storage and transport processes below the axes of active medium to fast spreading ridges is of fundamental importance to understanding ridge segmentation and the dynamic behavior of axial volcanoes. Detailed petrologic and geochemical studies of well-studied and well-sampled ridge segments can provides strong constraints on the nature and geometry of these processes. This project will analyze trace element, mineral chemistry, and crystal size distribution data from the East Pacific Rise between 9 degree 20 minutes North and 9 degrees 53 minutes North to test models of magma transport and magma chamber processes. One model of mid-ocean ridge volcanism considers the volcanism to be the result of deep upwelling which degenerates upward into multiple diapirs and conduits. At shallow levels magmas apparently undergo fractionation with rocks crystallized from high-temperature melts forming at local ridge-crest highs and rocks crystallizing form low-temperature melts found at ridge-crest lows. This model will be tested by comparing analyses from extensive dredge hauls to calculations of rock compositions that would be expected from a fractionation of one or more parent magmas.