Upper Mantle Electrical Conductivity Variations Beneath North America and Adjacent Oceans

9530019 Maciie这是一项为期三年的合作计划，旨在研究海洋和大陆下(1,000公里)上地幔的电导率差异。次大陆和次大洋上地幔的组成和温度差异已被提出用来解释一系列地球物理数据(Jordan，1975)，并被认为在板块构造和地幔对流中发挥重要作用。这一概念被称为构造圈概念，它设想次大陆地幔相对于次大洋地幔来说是寒冷的，而且铁元素贫乏。地幔中的电性强烈地依赖于温度和铁，因此，预计次大洋和次大陆上地幔之间的电性差异将提供相当多的信息。该项目将涉及收集几个实地数据集，这些数据集将合并成一致和可靠的上地幔传导性结构的三维模型，以便详细地研究岩石圈的概念。

9530019 Maciie This is a three year collaborative proposal for investigating upper mantle ( 1000 km) conductivity differences beneath the oceans and continents. Subcontinental and suboceanic upper mantle compositional and temperature differences have been proposed to explain a wide array of geophysical data (jordan, 1975) and are postulated to play an important role in plate tectonics and mantle convection. This concept, known as the tectosphere concept, envisions that the subcontinental mantle is cold and depleted in iron relative to the suboceanic mantle. Electrical properties in the mantle are strongly dependent upon both temperature and iron, and hence, it is expected that there would be considerable information in the electrical property differences between the suboceanic and subcontinental uppers mantles. The project will involve collections of several field data sets which will be combined into a consistent and robust 3-D model of the upper mantle conductivity structure for a detailed electrical look at the tectosphere concept.