Abstract:
:Upper mantle viscosity plays a key role in understanding plate tectonics and is usually extrapolated from laboratory-based creep measurements of upper mantle conditions or constrained by modeling geodetic and post-seismic observations. At present, an effective method to obtain a high-resolution viscosity structure is still lacking. Recently, a promising estimation of effective viscosity was obtained from a transform derived from the results of magnetotelluric imaging. Here, we build a relationship between effective viscosity and electrical conductivity in the upper mantle using water content. The contribution of water content to the effective viscosity is isolated in a flow law with reference to relatively dry conditions in the upper mantle. The proposed transform is robust and has been verified by application to data synthesized from an intraoceanic subduction zone model. We then apply the method to transform an electrical conductivity cross-section across the Yangtze block and the North China Craton. The results show that the effective viscosity structure coincides well with that estimated from other independent datasets at depths of 40 to 80 km but differs slightly at depths of 100 to 200 km. We briefly discussed the potentials and associated problems for application.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Xu Y,Zhang A,Yang B,Bao X,Wang Q,Xia J,Yang Wdoi
10.1038/s41598-018-20250-2subject
Has Abstractpub_date
2018-01-29 00:00:00pages
1771issue
1issn
2045-2322pii
10.1038/s41598-018-20250-2journal_volume
8pub_type
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