Seismic observation of an extremely magmatic accretion at the ultraslow spreading Southwest Indian Ridge

doi:10.1002/2014GL062521

CORC > 北京大学 > 地球与空间科学学院

	Seismic observation of an extremely magmatic accretion at the ultraslow spreading Southwest Indian Ridge
	Li, Jiabiao ; Jian, Hanchao ; Chen, Yongshun John ; Singh, Satish C. ; Ruan, Aiguo ; Qiu, Xuelin ; Zhao, Minghui ; Wang, Xianguang ; Niu, Xiongwei ; Ni, Jianyu ; Zhang, Jiazheng
刊名	geophysical research letters
	2015
DOI	10.1002/2014GL062521
英文摘要	The oceanic crust is formed by a combination of magmatic and tectonic processes at mid-ocean spreading centers. Under ultraslow spreading environment, however, observations of thin crust and mantle-derived peridotites on the seafloor suggest that a large portion of crust is formed mainly by tectonic processes, with little or absence of magmatism. Using three-dimensional seismic tomography at an ultraslow spreading Southwest Indian Ridge segment containing a central volcano at 50??28??E, here we report the presence of an extremely magmatic accretion of the oceanic crust. Our results reveal a low-velocity anomaly (-0.6 km/s) in the lower crust beneath the central volcano, suggesting the presence of partial melt, which is accompanied by an unusually thick crust (??9.5 km). We also observe a strong along-axis variation in crustal thickness from 9.5 to 4 km within 30-50 km distance, requiring a highly focused melt delivery from the mantle. We conclude that the extremely magmatic accretion is due to localized melt flow toward the central volcano, which was enhanced by the significant along-axis variation in lithosphere thickness at the ultraslow spreading Southwest Indian Ridge. ?2015. American Geophysical Union. All Rights Reserved.; SCI(E); EI; 0; ARTICLE; johnyc@pku.edu.cn; 8; 2656-2663; 42
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/411049]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li, Jiabiao,Jian, Hanchao,Chen, Yongshun John,et al. Seismic observation of an extremely magmatic accretion at the ultraslow spreading Southwest Indian Ridge[J]. geophysical research letters,2015.
APA	Li, Jiabiao.,Jian, Hanchao.,Chen, Yongshun John.,Singh, Satish C..,Ruan, Aiguo.,...&Zhang, Jiazheng.(2015).Seismic observation of an extremely magmatic accretion at the ultraslow spreading Southwest Indian Ridge.geophysical research letters.
MLA	Li, Jiabiao,et al."Seismic observation of an extremely magmatic accretion at the ultraslow spreading Southwest Indian Ridge".geophysical research letters (2015).