Modification of Along‐Ridge Topography and Crustal Thickness by Mantle Plume and Oceanic Transform Fault at Ultra‐Slow Spreading Mohns Ridge

Abstract The mantle plumes modify geophysical and geochemical features along and across mid‐ocean ridges. Despite abundant studies of plume‐ridge interaction, few geodynamic studies focus on the Arctic Ocean. The Jan Mayen Hotspot is located at the southern end of the Mohns Ridge and offset by the J...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Yinuo Zhang, Fan Zhang, Xubo Zhang, Tao Zhang, Jian Lin, Zhiyuan Zhou, Jiangyang Zhang
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
mid‐ocean ridge
M factor
transform fault
geodynamic modeling
mantle plume
crustal thickness
Geophysics. Cosmic physics
QC801-809
Arctic Ocean
Jan Mayen
Online Access:https://doi.org/10.1029/2023GL105871
https://doaj.org/article/c46cc4948d0d4c27a04dc89158d87091
Description
Summary:Abstract The mantle plumes modify geophysical and geochemical features along and across mid‐ocean ridges. Despite abundant studies of plume‐ridge interaction, few geodynamic studies focus on the Arctic Ocean. The Jan Mayen Hotspot is located at the southern end of the Mohns Ridge and offset by the Jan Mayen Transform Fault, which creates an ideal area to study plume‐ridge‐transform fault interaction at the ultra‐slow spreading ridge. Through analyzing geophysical observations, we revealed that the M factor and crustal thickness decrease and the axial relief increases northeastward along the Mohns Ridge within a distance of ∼370 km to the Jan Mayen Hotspot. Combined with modeling results, the properties of the Jan Mayen plume were estimated, which has a diameter of 75 km, a temperature anomaly of 100°C, and a buoyancy flux of 0.22 Mg/s. Additionally, our model results indicate that the along‐ridge dispersion of plume is slightly enhanced by the transform fault.

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