Constraints on lithospheric mantle and crustal anisotropy in the NoMelt area from an analysis of long-period seafloor magnetotelluric data

• Material Type: 記事
• Title: Constraints on lithospheric mantle and crustal anisotropy in the NoMelt area from an analysis of long-period seafloor magnetotelluric data
• Author/Editor: Tetsuo Matsuno; Rob. L. Evans
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2017-10-05
• Publication Date (W3CDTF): 2017-10-05
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 69(138)
• Volume: 69(138)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-017-0724-1; https://doi.org/10.1186/s40623-017-0724-1
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• Date Accepted (W3CDTF): 2017-12-14T17:18:17+09:00
• Date Captured (W3CDTF): 2017-12-12
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• Summary, etc.: Despite strong anisotropy seen in analysis of seismic data from the NoMelt experiment in 70 Ma Pacific seafloor, a previous analysis of coincident magnetotelluric (MT) data showed no evidence for anisotropy in the electrical conductivity structure of either lithosphere or asthenosphere. We revisit the MT data and use 1D anisotropic models of the lithosphere to demonstrate the limits of acceptable anisotropy within the data. We construct 1D models by varying the thickness and the degree of anisotropy within the lithosphere and conduct a series of tests to investigate what types of electrical anisotropy are compatible with the data. We find that electrical anisotropy is possible in a sheared and/or hydrous mantle within the lower lithosphere (60-90 km depth). The data are not compatible with pervasive electrical anisotropy in the crust. Causes of anisotropy within the highly resistive upper and mid-lithosphere, as seen seismically, are not expected to cause measurable impacts on MT response.
• DOI: 10.1186/s40623-017-0724-1; https://doi.org/10.1186/s40623-017-0724-1
• Access Restrictions: インターネット公開
• Rights (production): © The Author(s) 2017.; This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
• Related Material (URI): https://hdl.handle.net/20.500.14094/90004268; http://id.ndl.go.jp/digimeta/11002664; https://dl.ndl.go.jp/pid/11002664; http://link.springer.com/article/10.1186/s40623-017-0724-1/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-017-0724-1.pdf; http://hdl.handle.net/1912/9320
• Is Referenced By: Probing 1-D electrical anisotropy in the oceanic upper mantle from seafloor magnetotelluric array data; https://cir.nii.ac.jp/crid/1360009142552422400
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• Bibliographic ID (NDL): 11002664; http://id.ndl.go.jp/bib/11002664
• NAID: 120006358584