Pressure-driven processes explain the decreasing magnetization of the subducting oceanic crust in the Japan Trench

Despite the decreases in temperature and permeability of oceanic plates with increasing age, hydrothermal circulation (HC) can be rejuvenated in the 130-Ma old Pacific plate in the vicinity of the Japan Trench, substantially affecting the thermal structure and remaining amount of magnetization (RAM)...

Full description

Saved in:
Bibliographic Details
Published in:Communications earth & environment 2023-12, Vol.4 (1), p.242-10, Article 242
Main Authors: Han, Dongwoo, Park, Yong-Hee, Lee, Changyeol
Format: Article
Language:English
Subjects:
Demagnetization
Evolution
Heat flow
Heat transmission
Heat transport
Hematite
Magnetite
Magnetization
Numerical models
Oceanic crust
Permeability
Phase transitions
Plates (tectonics)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Despite the decreases in temperature and permeability of oceanic plates with increasing age, hydrothermal circulation (HC) can be rejuvenated in the 130-Ma old Pacific plate in the vicinity of the Japan Trench, substantially affecting the thermal structure and remaining amount of magnetization (RAM). To decipher the roles of HC in the thermal structure and the RAM, the vigor and extent of HC in the vicinity of the Japan Trench should be quantitatively evaluated. Here we numerically show that HC is rejuvenated in the outer-rise zone but ceases after subduction owing to permeability evolution. The calculated thermal structure explains the measured heat flow evolution but negates the HC-driven thermal demagnetization, which was thought to decrease the RAM after subduction. Instead, we propose that the pressure-driven processes decrease the RAM after subduction through the demagnetizations of titanomaghemite and magnetite and the mineral phase transitions from maghemite to hematite.
ISSN:2662-4435
2662-4435
DOI:10.1038/s43247-023-00903-5