Magmatism at oceanic core complexes on the ultraslow Southwest Indian Ridge: Insights from near-seafloor magnetics - Institut de Physique du Globe de Paris Accéder directement au contenu
Article Dans Une Revue Geology Année : 2022

Magmatism at oceanic core complexes on the ultraslow Southwest Indian Ridge: Insights from near-seafloor magnetics

Fei Zhou
  • Fonction : Auteur
  • PersonId : 1338727
  • IdRef : 275057615
Chunhui Tao
  • Fonction : Auteur
  • PersonId : 1195737

Résumé

Abstract Oceanic core complexes (OCCs) and detachment faults play a key role in crustal accretion at slow and ultraslow spreading centers. We investigated the effect of different magma supply at three OCCs of the Southwest Indian Ridge using high-resolution deep-sea bathymetric and magnetic data. The average equivalent thickness of extrusive basalt deduced from the magnetic anomalies, a proxy for magma supply, decreases from west to east, from the Yuhuang (49.25°E) to Longqi (49.65°E) to Junhui (51.75°E) OCCs. Conversely, serpentinite outcrops become more abundant, the domal OCC morphology flattens as the footwall rotation (measured by the magnetization vector inclination) increases, and hydrothermal evidence becomes sparse. Combined with results from the amagmatic easternmost Southwest Indian Ridge, our study shows that the magma supply controls the character and evolution of the OCCs and detachment faults on the Southwest Indian Ridge.
Fichier principal
Vignette du fichier
Zhou_Dyment_Geology_22_Final.pdf (6.18 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

insu-03875731 , version 1 (28-11-2022)

Identifiants

Citer

Fei Zhou, Jérôme Dyment, Chunhui Tao, Tao Wu. Magmatism at oceanic core complexes on the ultraslow Southwest Indian Ridge: Insights from near-seafloor magnetics. Geology, 2022, 50 (6), pp.726-730. ⟨10.1130/G49771.1⟩. ⟨insu-03875731⟩
10 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More