气候变化领域集成服务门户(CCPortal): Crustal Structure of the Greenland-Iceland Ridge from Joint Refraction and Reflection Seismic Tomography

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DOI	10.1029/2020JB019847
	Crustal Structure of the Greenland-Iceland Ridge from Joint Refraction and Reflection Seismic Tomography
	Yuan X.; Korenaga J.; Holbrook W.S.; Kelemen P.B.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	We report a reanalysis of active-source wide-angle seismic data collected along the Greenland-Iceland Ridge during the 1996 Seismic Investigation of the Greenland Margin (SIGMA) experiment. Interpreting the crustal structure of volcanic rifted margins has suffered from nonuniqueness because thick crust at the continent-ocean transition may not be totally of igneous origin. In this regard, the Greenland-Iceland Ridge presents a unique opportunity because, together with the Faroe-Iceland Ridge, it is generally considered to constitute the Iceland hotspot track, and as such, the bulk of its crust may be considered to be of igneous origin. From 15 ocean-bottom instruments deployed along a 290-km-long refraction transect, we collect 5,383 Pg and 1,118 PmP travel times, and we use joint refraction and reflection seismic tomography with adaptive importance sampling to invert them to construct a two-dimensional compressional wave speed (Vp) model across the Greenland-Iceland Ridge. Based on the covariation of crustal thickness and Vp, the western part of the transect may be almost entirely continental. Even the eastern part could include a significant fraction of preexisting continental crust. When considered together with the seismic structure of the Icelandic crust and its geochemical characteristics, our results suggest that the putative Iceland mantle plume could be considerably weaker than commonly assumed. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Continental breakup; Iceland hotspot; Large igneous provinces; Ocean-bottom seismology; Seismic tomography
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/187779
作者单位	School of Geophysics and Information Technology, China University of Geosciences, Beijing, China; Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States; Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; Department of Earth and Environmental Sciences, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	Yuan X.,Korenaga J.,Holbrook W.S.,et al. Crustal Structure of the Greenland-Iceland Ridge from Joint Refraction and Reflection Seismic Tomography[J],2020,125(7).
APA	Yuan X.,Korenaga J.,Holbrook W.S.,&Kelemen P.B..(2020).Crustal Structure of the Greenland-Iceland Ridge from Joint Refraction and Reflection Seismic Tomography.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Yuan X.,et al."Crustal Structure of the Greenland-Iceland Ridge from Joint Refraction and Reflection Seismic Tomography".Journal of Geophysical Research: Solid Earth 125.7(2020).