气候变化领域集成服务门户(CCPortal): Locally Thin Crust and High Crustal VP/VS Ratio Beneath the Armenian Volcanic Highland of the Lesser Caucasus: A Case for Recent Delamination

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DOI	10.1029/2019JB019151
	Locally Thin Crust and High Crustal VP/VS Ratio Beneath the Armenian Volcanic Highland of the Lesser Caucasus: A Case for Recent Delamination
	Lin C.-M.; Tseng T.-L.; Meliksetian K.; Karakhanyan A.; Huang B.-S.; Babayan H.; Hu J.-C.; Gevorgyan M.; Chang S.-F.; Levonyan A.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	The Arabia-Eurasia continental collision created the Caucasus Mountains and the Anatolian and Iranian plateaus. Between the two plateaus, the Armenian Highland features young Holocene-aged volcanoes. In this study, the P-wave receiver functions from a new seismic array reveal a thick crust (up to ~52 km thick) beneath the Central Greater Caucasus and an unusually thin crust (32–35 km thick) beneath the northwestern part of Armenia near the Aragats stratovolcano and Gegham volcanic ridge formed by Pleistocene to Holocene monogenetic cinder cones. The average crustal VP/VS ratio in the Armenian Highland is anomalously high (≥1.9), with the highest value approaching 2.1 under the Gegham Ridge. Such high VP/VS ratios cannot be explained by an overall mafic crustal composition. Instead, the presence of partial melts is inferred in the lower crust based on the depth of the low-velocity structure obtained by inversion of receiver function waveforms. Our study suggests that the postcollisional volcanism was potentially facilitated by the small-scale removal of lithospheric mantle, resulting in a localized thinner crust balanced by thermal buoyancy and dynamic flow in the uppermost mantle beneath the Armenian Highland. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Armenian Highland; crustal structure; delamination; Lesser Caucasus; postcollision volcanism; receiver functions
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/187638
作者单位	Department of Geosciences, National Taiwan University, Taipei, Taiwan; Now at Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan; Institute of Geological Sciences, National Academy of Sciences, Yerevan, Armenia; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
推荐引用方式 GB/T 7714	Lin C.-M.,Tseng T.-L.,Meliksetian K.,et al. Locally Thin Crust and High Crustal VP/VS Ratio Beneath the Armenian Volcanic Highland of the Lesser Caucasus: A Case for Recent Delamination[J],2020,125(9).
APA	Lin C.-M..,Tseng T.-L..,Meliksetian K..,Karakhanyan A..,Huang B.-S..,...&Levonyan A..(2020).Locally Thin Crust and High Crustal VP/VS Ratio Beneath the Armenian Volcanic Highland of the Lesser Caucasus: A Case for Recent Delamination.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Lin C.-M.,et al."Locally Thin Crust and High Crustal VP/VS Ratio Beneath the Armenian Volcanic Highland of the Lesser Caucasus: A Case for Recent Delamination".Journal of Geophysical Research: Solid Earth 125.9(2020).