A Potential Mode of the Lithospheric Growth and Delamination of Orogenic Belts: Evidence From High‐Resolution Magnetotelluric Data

Author:

Xin Zhonghua1,Liu Wenyu12,Han Jiangtao134ORCID,Liu Lijia134,Zeng Zhiwen1

Affiliation:

1. College of Geoexploration Science and Technology Jilin University Changchun China

2. School of Geophysics and Measurement‐Control Technology East China University of Technology Nanchang China

3. Key Laboratory of Applied Geophysics of Ministry of Natural Resources Changchun China

4. Changbai Mountain Volcano Comprehensive Geophysics Field Science Observation and Research Station of Ministry of Education Changchun China

Abstract

AbstractThe Greater Xing'an Range (GXAR), situated in the eastern segment of the Central Asian Orogenic Belt, is a prominent orogenic belt that offers an ideal opportunity to explore the dynamic processes underlying lithospheric growth and delamination. A two‐dimensional resistivity model was obtained based on a magnetotelluric survey with 110 stations. The results identified a lateral conductor, associated with the asthenosphere, in the overall high‐resistivity lithosphere of the GXAR. This conductor was recognized as the residual trace of the asthenospheric materials upwelling along the reactivated Xinlin‐Xiguitu suture zone, manifested as the precipitation of metasomes/conductive phases or new lithosphere distributed along channels. The transformation of the GXAR, involving the lithospheric accretion and erosion from the interior, suggests a geodynamic process of thick lithospheric delamination. The erosion of asthenospheric materials from the interior of the lithosphere was deemed as a potential mode of the lithospheric growth and delamination of orogenic belts. The discontinuity of lithospheric thickness, the reactivation of paleo‐sutures, and the tectonic environment leading to mantle convection control the occurrence of this mode.

Funder

People's Government of Jilin Province

Publisher

American Geophysical Union (AGU)

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