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

合作研究：将地幔各向异性电导率与变形联系起来的实验室和现场研究

• 批准号: 0073607
• 负责人: Mihai Ducea
• 金额: $ 2.61万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0073607&HistoricalAwards=false
• 关键词: Collaborative; Research; Laboratory; Field; Studies

0073607Ducea 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.

0073607Ducea上地幔的遥感特性之一是其电导率。地面地球物理测量，通常是大地电磁测深，用于推断这一属性。然而，对所得电导率截面的解释必须依赖于实验室测量。研究人员提出了一个独特的整合大地电磁测量，捕虏体研究，和实验室实验，以确定目前的物理状态下的上地幔下的塞拉内华达州和加州盆地和山脉。此外，他们概述了一系列的变形实验，将提供在地幔中的变形，伴随着晚新生代盆地和山脉省的西缘延伸的量和类型的限制。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。这项研究的一个关键组成部分将是量化的量的电各向异性诱导在各种变形和熔化。