https://scholars.lib.ntu.edu.tw/handle/123456789/571670
標題: | Lateral Structural Variation of the Lithosphere-Asthenosphere System in the Northeastern to Eastern Iranian Plateau and Its Tectonic Implications | 作者: | Wu Z SUN-LIN CHUNG et al. |
關鍵字: | Arabian plate; asthenosphere; collision zone; continental collision; deformation mechanism; Eurasian plate; lithospheric structure; mantle process; plate tectonics; S-wave; structural geology; subduction zone; tectonic setting; waveform analysis; Iranian Plateau | 公開日期: | 2021 | 卷: | 126 | 期: | 1 | 來源出版物: | Journal of Geophysical Research: Solid Earth | 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. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099929627&doi=10.1029%2f2020JB020256&partnerID=40&md5=6b53ad36fc8e01035264aa33d61d2a53 https://scholars.lib.ntu.edu.tw/handle/123456789/571670 |
ISSN: | 21699313 | DOI: | 10.1029/2020JB020256 |
顯示於: | 地質科學系 |
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