气候变化领域集成服务门户(CCPortal): Elastic thickness of the Iranian lithosphere from gravity and seismic data

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DOI	10.1016/j.tecto.2019.228186
	Elastic thickness of the Iranian lithosphere from gravity and seismic data
	Eshagh M.; Tenzer R.; Eshagh M.
发表日期	2020
ISSN	00401951
卷号	774
英文摘要	We estimate the (effective) elastic thickness of the Iranian lithosphere (and adjoining tectonic plates) by using the approach that combines the Vening Meinesz-Moritz's (VMM) regional isostatic principle with the isostatic flexural model formulated based on solving a flexural differential equation for a thin elastic shell. To model the response on a load more realistically, we also consider the lithospheric density structure. The resulting expression describes a functional relation that links gravity field and mechanical properties of the lithosphere. The Young modulus and the Poisson ratio are computed from seismic velocity data in prior of estimating the lithospheric elastic thickness. The presented results reveal that the estimated elastic thickness closely resembles a regional tectonic configuration associated with the extensional tectonism along the Red Sea-Gulf Rift System, the continental collision of the Arabian and Eurasian plates, and the subduction along the Makran Subduction Zone. Seismically and volcanically active convergent tectonic margins of the Zagros and Kopeh Dagh Fold and Thrust Belts further extending along the Makran Accretionary Complex are characterised by a low lithospheric strength, with the elastic thickness typically less than ∼30 km. These small values of the elastic thickness are in a striking contrast to much larger values within most of the Central Iranian Blocks. According to our estimate, local maxima there reach ∼70 km in the Tabas micro-block. The elastic thickness of the Turan and Arabian Platforms reaches maxima of ∼100 km. These results generally support the hypothesis that tectonically active zones and orogens have a relatively low strength, resulting in a significant response of the lithosphere on various tectonic loads, compared to a significant strength of old cratonic formations. Interestingly, however, we observe a striking contrast between a low strength of the Arabian Shield compared to a high strength of the Arabian Platform. A possible explanation of this finding could be given by a different thermal regime of the Arabian lithosphere, controlled mainly by a mantle upwelling and a consequent extensional tectonism along the Red Sea-Gulf Rift System. © 2019
关键词	Cratons Elastic thickness Flexure Iranian block Isostasy Lithosphere
英文关键词	Differential equations; Plates (structural components); Seismic waves; Seismology; Tectonics; Cratons; Elastic thickness; Flexure; Iranian block; Isostasy; Lithosphere; Structural geology
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207745
作者单位	Department of Engineering Science, University West, Sweden; Department of Geodesy, K. N. Toosi University of Technology, Tehran, Iran; Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University, Hong Kong; Department of Geology, Islamic Azad University, Karaj branch, Iran
推荐引用方式 GB/T 7714	Eshagh M.,Tenzer R.,Eshagh M.. Elastic thickness of the Iranian lithosphere from gravity and seismic data[J],2020,774.
APA	Eshagh M.,Tenzer R.,&Eshagh M..(2020).Elastic thickness of the Iranian lithosphere from gravity and seismic data.Tectonophysics,774.
MLA	Eshagh M.,et al."Elastic thickness of the Iranian lithosphere from gravity and seismic data".Tectonophysics 774(2020).