气候变化领域集成服务门户(CCPortal): Asthenospheric Flow of Plume Material Beneath Arabia Inferred From S Wave Traveltime Tomography

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DOI	10.1029/2020JB019668
	Asthenospheric Flow of Plume Material Beneath Arabia Inferred From S Wave Traveltime Tomography
	Lim J.-A.; Chang S.-J.; Mai P.M.; Zahran H.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Widespread Cenozoic volcanism in the Arabian Peninsula has been attributed to mantle plume activity and/or lithospheric thinning due to rift-related extension. However, there is discrepancy between geochemical and geophysical studies about which mechanism is dominant over the other for post-12 Ma volcanism. Plume signals in some volcanic fields in the Arabian shield are not evident in isotope analyses, but low-velocity anomalies connected to Afar are found beneath the Arabian shield in tomographic studies and interpreted as asthenospheric flow from the Afar plume. To resolve this contradiction, we investigate the upper mantle beneath the Arabian Peninsula and northeastern Africa by inverting relative S and SKS wave arrival times recorded at dense seismic networks to derive a high-resolution S wave velocity model. Our results clearly show a narrow, elongated low-velocity anomaly along the Makkah-Madinah-Nafud (MMN) volcanic line beneath the Arabian shield at 100–300 km depth which extends northward to Harrat Ithnayn and Harrat Lunayyir, but most likely not further north. The limited extent of the low-velocity anomaly and variations in lithospheric thickness of the Arabian shield may explain why geochemical studies did not find plume signals in some harrats. Therefore, the timing and plume signals of volcanism in western Arabia may not be age progressive from Afar. We also find a possible connection between the low-velocity anomalies beneath Harrat Lunayyir and the MMN line, suggesting that the 2007–2009 seismic swarm may be associated with northward asthenospheric flow of plume material from Afar. ©2020. The Authors.
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/187723
作者单位	Division of Geology and Geophysics, Kangwon National University, Chuncheon, South Korea; Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia; National Center for Earthquakes and Volcanoes, Saudi Geological Survey, Jeddah, Saudi Arabia
推荐引用方式 GB/T 7714	Lim J.-A.,Chang S.-J.,Mai P.M.,et al. Asthenospheric Flow of Plume Material Beneath Arabia Inferred From S Wave Traveltime Tomography[J],2020,125(8).
APA	Lim J.-A.,Chang S.-J.,Mai P.M.,&Zahran H..(2020).Asthenospheric Flow of Plume Material Beneath Arabia Inferred From S Wave Traveltime Tomography.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Lim J.-A.,et al."Asthenospheric Flow of Plume Material Beneath Arabia Inferred From S Wave Traveltime Tomography".Journal of Geophysical Research: Solid Earth 125.8(2020).