气候变化领域集成服务门户(CCPortal): Crustal Structure of the Niuafo'ou Microplate and Fonualei Rift and Spreading Center in the Northeastern Lau Basin, Southwestern Pacific

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DOI	10.1029/2019JB019184
	Crustal Structure of the Niuafo'ou Microplate and Fonualei Rift and Spreading Center in the Northeastern Lau Basin, Southwestern Pacific
	Schmid F.; Kopp H.; Schnabel M.; Dannowski A.; Heyde I.; Riedel M.; Hannington M.D.; Engels M.; Beniest A.; Klaucke I.; Augustin N.; Brandl P.A.; Devey C.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	The northeastern Lau Basin is one of the fastest opening and magmatically most active back-arc regions on Earth. Although the current pattern of plate boundaries and motions in this complex mosaic of microplates is reasonably understood, the internal structure and evolution of the back-arc crust are not. We present new geophysical data from a 290 km long east-west oriented transect crossing the Niuafo'ou Microplate (back-arc), the Fonualei Rift and Spreading Center (FRSC) and the Tofua Volcanic Arc at 17°20′S. Our P wave tomography model and density modeling suggest that past crustal accretion inside the southern FRSC was accommodated by a combination of arc crustal extension and magmatic activity. The absence of magnetic reversals inside the FRSC supports this and suggests that focused seafloor spreading has until now not contributed to crustal accretion. The back-arc crust constituting the southern Niuafo'ou Microplate reveals a heterogeneous structure comprising several crustal blocks. Some regions of the back-arc show a crustal structure similar to typical oceanic crust, suggesting they originate from seafloor spreading. Other crustal blocks resemble a structure that is similar to volcanic arc crust or a “hydrous” type of oceanic crust that has been created at a spreading center influenced by slab-derived water at distances <50 km to the arc. Throughout the back-arc region, we observe a high-velocity (Vp 7.2–7.5 km s−1) lower crust, which is an indication for magmatic underplating, which is likely sustained by elevated upper mantle temperatures in this region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	back-arc basin; Lau Basin
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/187822
作者单位	GEOMAR, Helmholtz Centre for Ocean Research, Kiel, Germany; Department of Geosciences, Kiel University, Kiel, Germany; BGR, Federal Institute for Geosciences and Natural Resources, Hanover, Germany; Department of Earth Sciences, University of Ottawa, Ottawa, ON, Canada; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
推荐引用方式 GB/T 7714	Schmid F.,Kopp H.,Schnabel M.,et al. Crustal Structure of the Niuafo'ou Microplate and Fonualei Rift and Spreading Center in the Northeastern Lau Basin, Southwestern Pacific[J],2020,125(6).
APA	Schmid F..,Kopp H..,Schnabel M..,Dannowski A..,Heyde I..,...&Devey C..(2020).Crustal Structure of the Niuafo'ou Microplate and Fonualei Rift and Spreading Center in the Northeastern Lau Basin, Southwestern Pacific.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Schmid F.,et al."Crustal Structure of the Niuafo'ou Microplate and Fonualei Rift and Spreading Center in the Northeastern Lau Basin, Southwestern Pacific".Journal of Geophysical Research: Solid Earth 125.6(2020).