Detailed Geochemical Investigations of the East Pacific Rise: 9 Degrees 16' North-9 Degrees 40' North and 13 Degrees 30'-15 Degrees 00' North

本项目是对东太平洋隆起北纬90 ~ 16′~ 90 ~ 40′和北纬30 ~ 30′~ 15′的样品进行微量元素和同位素分析，这些样品是通过细尺度疏浚获得的。目的是研究单个岩浆房中岩浆的微量元素和同位素的非均质性，研究脊分割的性质及其对精细尺度地球化学的控制，检验时间变异，验证局部Pb-Pb相关性是记录局部地幔非均质性年龄的等时线假设。近年来对从海底打捞的岩石进行地球化学测量的最有趣的结果之一是，沿着形成岩石的洋中脊轴线，岩石的成分发生了细微的变化。这些成分的变化似乎与洋脊轴线本身的构造分割有关，但细节尚不清楚。这个项目是由一个成熟的地球化学家（White）和一个聪明的年轻地球化学家（Castillo）进行的，他参与了样本集的初始收集，在一个存在大量地球物理数据的地区的一套岩石上，应该对构造和岩浆分割脊峰之间的关系有重要的见解。

This is a project to carry out trace element and isotopic analyses on samples from the East Pacific Rise at 9> 16' to 9> 40' N and 13> 30' to 15> N that have been obtained by dredging on a fine scale. The objectives are to investigate trace element and isotopic heterogeneity among lavas from a single magma chamber, to study nature of ridge segmentation and its controls on fine scale geochemistry, examine temporal variability and test hypothesis the local Pb-Pb correlations are isochrons recording the age of local mantle heterogeneity. %%% One of the most interesting results of geochemical measurements on rocks dredged from the sea floor in recent years has been fine scale variations of composition along the axis of mid-ocean ridges where the rocks are formed. These compositional variations appear to be related to tectonic segmentation of the ocean ridge axes themselves, but the details are not well understood. This project, being carried out by an established geochemist (White) and a bright young geochemist (Castillo), who was engaged in the initial collection on the sample set, on a suite of rocks from an area where much geophysical data exists, should yield significant insight into the relationship between tectonic and magmatic segmentation of ridge crests.