Collaborative Research: Laboratory and Field Studies Linking Anisotropic Electrical Conductivity and Deformation in the Mantle

[00:73626 . wanamaker]上地幔的一个遥感特性是它的导电性。地面地球物理测量，通常是大地电磁测深，用来推断这种性质。然而，对所得电导率截面的解释必须依赖于实验室测量。研究人员提出了一种独特的大地电磁测量、捕虏体研究和实验室实验相结合的方法，以确定内华达山脉和加利福尼亚盆地和山脉下的上地幔的物理状态。此外，他们还概述了一系列的变形实验，这些实验将对伴随盆地和山脉西缘晚新生代扩张的地幔变形的数量和类型提供限制。该项目的一个特别重要的部分是研究固体硅酸盐组分和不混溶的硫化物和硅酸盐熔体所起的单独和可能的协同作用。本研究的一个关键组成部分将是量化在不同变形和熔化量下引起的电各向异性的数量。

0073626Wanamaker One of the remotely sensed properties of the upper mantle is its electrical conductivity. Surface geophysical measurements, often magnetotelluric soundings, are used to infer this property. Interpretation of the resulting electrical conductivity cross sections must rely on laboratory measurements, however. The investigators propose a unique integration of magnetotelluric measurements, xenolith studies, and laboratory experiments in order to determine the present physical state of the upper mantle beneath the Sierra Nevada and California Basin and Range. Further, they outline a series of deformation experiments that will provide constraints on the amount and type of deformation in the mantle that accompanied the late Cenozoic extension of the western margin of the Basin and Range province. A particularly important part of this project is to examine the separate and possibly synergistic roles played by solid silicate components and immiscible sulfide and silicate melts. A key component of this study will be to quantify the amount of electrical anisotropy induced at various amounts of deformation and melting.