globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116787
论文题名:
The fate of marine magnetic anomaly in subduction zones: A global appraisal
作者: Choe H.; Dyment J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 561
语种: 英语
中文关键词: alteration ; Curie temperature ; hydrothermal circulation ; seafloor-spreading magnetic anomalies ; subduction zone
英文关键词: Basalt ; Demagnetization ; Cascadia subduction zone ; Hydrothermal circulation ; Increasing temperatures ; Magnetic anomalies ; Marine magnetic anomalies ; Oceanic lithosphere ; Seafloor spreading ; Thermal demagnetization ; Structural geology ; demagnetization ; hydrothermal circulation ; magnetic anomaly ; oceanic lithosphere ; physical property ; seafloor spreading ; subduction zone ; Cascadia Subduction Zone ; Japan Trench ; Pacific Ocean ; Cascadia
英文摘要: Seafloor spreading magnetic anomalies of oceanic plates progressively decay and disappear when approaching and entering subduction. Previous studies focused on the Japan Trench showed that before subduction, the flexure of oceanic lithosphere opens normal faults and rejuvenates hydrothermal circulation which results in the alteration of magnetic minerals. After subduction, thermal demagnetization affects the magnetic minerals of the oceanic crust when the increasing temperature of the subducting slab passes their Curie temperature. No other subduction zone was investigated so far. Here we study the evolution of magnetic anomalies in five subduction zones. The major observed differences are controlled by the age of the lithosphere and related physical properties. Before subduction, magnetic anomalies of old oceanic lithosphere show a significant decay (20-30%) related to alteration whereas those of young lithosphere at the Cascadia subduction zone displays no such decay as a consequence of negligible flexure on the young Juan de Fuca plate. After subduction, the magnetic anomalies of the subducting plate show a rapid decay reflecting the thermal demagnetization of extrusive basalt, amounting for 30-40% in old oceanic lithosphere and more than 70% in the young lithosphere of Cascadia. Beyond complete thermal demagnetization of extrusive basalt, about 40% of the magnetization remains in the old lithosphere and less than 30% in the young lithosphere of Cascadia. © 2021 The Author(s)
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165435
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, F-75005, France; Research Institute for Earth Resources, Kangwon National University, Chuncheon, Gangwon-do 24341, South Korea

Recommended Citation:
Choe H.,Dyment J.. The fate of marine magnetic anomaly in subduction zones: A global appraisal[J]. Earth and Planetary Science Letters,2021-01-01,561
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Choe H.]'s Articles
[Dyment J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Choe H.]'s Articles
[Dyment J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Choe H.]‘s Articles
[Dyment J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.