气候变化领域集成服务门户(CCPortal): Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications

CCPortal

DOI	10.1029/2020JB020256
	Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications
	Wu Z.; Chen L.; Talebian M.; Wang X.; Jiang M.; Ai Y.; Lan H.; Gao Y.; Khatib M.M.; Hou G.; Chung S.-L.; Liang X.; Zhao L.; Naimi-Ghassabian N.; Xiao W.; Zhu R.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	The Iranian plateau is a natural laboratory for deciphering the lithospheric deformation and deep dynamics in response to the Neo-Tethyan subduction and subsequent Arabia-Eurasia continental collision. Here we used S-wave receiver function data from a dense seismic array to construct the structural image of the lithosphere-asthenosphere system across the northeastern to eastern Iranian plateau. The lithosphere-asthenosphere boundary (LAB) is consistently imaged, being relatively flat at 80–90 km depth in eastern Iran, but deepening northward to ∼120 km depth beneath the Kopeh Dagh-Turan platform boundary with an overall “root-like” shape in northeastern Iran. A shallower (<45 km) and a deeper Moho (∼50–55 km) are also observed beneath eastern and northeastern Iran, respectively, suggesting similar crustal deformation to mantle lithosphere but different patterns laterally. Moreover, a strong positive velocity discontinuity (PVD) is detected at ∼170 km depth beneath eastern Iran, possibly representing the base of an asthenospheric low-velocity layer (LVL). Waveform modeling reveals large velocity contrasts of ∼4%–6% over a depth range of less than 30 and 20 km, respectively, across the LAB and the asthenospheric PVD. Combining our new results with geological and petrological constraints, we deduced that the asthenospheric LVL contains a small amount of melt, with sharp boundaries separating from the nearly melt-free lithosphere above (LAB) and deeper mantle below (PVD). The observed structural variations of the lithosphere-asthenosphere system across the study region may result from the complex lithospheric deformation in response to the Arabia-Eurasia collision and effects of multiple tectono-thermal events associated with the earlier Neo-Tethyan subduction. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	asthenospheric melting; Iranain plateau; lithospheric deformation; mantle dynamics; S-wave receiver function; structure of lithosphere-asthenosphere system
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187425
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Department of Geology, University of Birjand, Birjand, Iran; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Geosciences, National Taiwan University, Taipei, Taiwan; Geological Survey of Iran, Mashhad Territory, Mashhad, Iran; Institutions of Earth Sciences, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Wu Z.,Chen L.,Talebian M.,et al. Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications[J],2021,126(1).
APA	Wu Z..,Chen L..,Talebian M..,Wang X..,Jiang M..,...&Zhu R..(2021).Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Wu Z.,et al."Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications".Journal of Geophysical Research: Solid Earth 126.1(2021).