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上地幔的远程感知特性之一是其电导率。表面地球物理测量值（通常是磁性音能）用于推断该特性。但是，对产生的电导率横截面的解释必须依靠实验室测量。研究人员提出了磁铁测量，异种石研究和实验室实验的独特整合，以确定内华达山脉和加利福尼亚盆地和加利福尼亚盆地和范围之下的上地幔的当前物理状态。此外，他们概述了一系列的变形实验，该实验将对地幔中变形的数量和类型提供约束，这些变形和类型伴随着盆地西部边缘和山脉省的西部边缘的晚期新生代延伸。该项目的一个特别重要的部分是检查固体硅酸盐成分以及不混溶的硫化物和硅酸盐熔体所扮演的独立且可能具有协同作用。这项研究的关键组成部分是量化以各种变形和熔化量引起的电向的电差。