气候变化领域集成服务门户(CCPortal): Decreasing Magnetization; Lithospheric Flexure; and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone

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DOI	10.1029/2019GL085975
	Decreasing Magnetization; Lithospheric Flexure; and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone
	Choe H.; Dyment J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:9
英文摘要	Seafloor spreading magnetic anomalies formed at mid-ocean ridges initially display strong amplitudes that decay within the first 10 million years as a result of pervasive hydrothermal circulation and alteration. The amplitudes do not vary much for older oceanic crust, suggesting that the thickening sediments hinder heat advection. Here we show, however, that a systematic loss of ~20% in the amplitude of the anomalies arises between the outer rise and the trench on old ocean crust approaching the Japan and Kuril subduction zones. We interpret this decay as reflecting the opening of normal faults and fissures caused by extension on the outer flexural rise and the subsequent renewed circulation of seawater into the oceanic crust, resulting in additional alteration of the magnetic minerals. This interpretation is supported by higher heat flow and seismic velocity changes observed toward the trench. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earth sciences; Geophysics; Heat advection; Hydrothermal circulation; Lithospheric flexure; Magnetic minerals; Mid-ocean ridges; Seafloor spreading; Seismic velocities; Subduction zones; Structural geology; amplitude; fissure; flexure; heat flow; hydrothermal circulation; magnetization; seismic velocity; trench; Japan; Calluna vulgaris
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170403
作者单位	Institut de physique du globe de Paris, Université de Paris, Paris, France
推荐引用方式 GB/T 7714	Choe H.,Dyment J.. Decreasing Magnetization; Lithospheric Flexure; and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone[J],2020,47(9).
APA	Choe H.,&Dyment J..(2020).Decreasing Magnetization; Lithospheric Flexure; and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone.Geophysical Research Letters,47(9).
MLA	Choe H.,et al."Decreasing Magnetization; Lithospheric Flexure; and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone".Geophysical Research Letters 47.9(2020).