Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/113338
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Type: | Journal article |
Title: | High-resolution lithosphere viscosity and dynamics revealed by magnetotelluric imaging |
Author: | Liu, L. Hasterok, D. |
Citation: | Science, 2016; 353(6307):1515-1519 |
Publisher: | American Association for the Advancement of Science |
Issue Date: | 2016 |
ISSN: | 0036-8075 1095-9203 |
Statement of Responsibility: | Lijun Liu and Derrick Hasterok |
Abstract: | An accurate viscosity structure is critical to truthfully modeling lithosphere dynamics. Here, we report an attempt to infer the effective lithospheric viscosity from a high-resolution magnetotelluric (MT) survey across the western United States. The high sensitivity of MT fields to the presence of electrically conductive fluids makes it a promising proxy for determining mechanical strength variations throughout the lithosphere. We demonstrate how a viscosity structure, approximated from electrical resistivity, results in a geodynamic model that successfully predicts short-wavelength surface topography, lithospheric deformation, and mantle upwelling beneath recent volcanism. We further show that this viscosity is physically consistent with and better constrained than that derived from laboratory-based rheology. We conclude that MT imaging provides a practical observational constraint for quantifying the dynamic evolution of the continental lithosphere. |
Rights: | Copyright © 2016, American Association for the Advancement of Science |
DOI: | 10.1126/science.aaf6542 |
Published version: | http://dx.doi.org/10.1126/science.aaf6542 |
Appears in Collections: | Aurora harvest 3 Geology & Geophysics publications |
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