The initiation of segmented buoyancy-driven melting during continental breakup - Sorbonne Université Access content directly
Journal Articles Nature Communications Year : 2016

The initiation of segmented buoyancy-driven melting during continental breakup

Abstract

Melting of the mantle during continental breakup leads to magmatic intrusion and volcanism, yet our understanding of the location and dominant mechanisms of melt generation in rifting environments is impeded by a paucity of direct observations of mantle melting. It is unclear when during the rifting process the segmented nature of magma supply typical of seafloor spreading initiates. Here, we use Rayleigh-wave tomography to construct a high-resolution absolute three-dimensional shear-wave velocity model of the upper 250 km beneath the Afar triple junction, imaging the mantle response during progressive continental breakup. Our model suggests melt production is highest and melting depths deepest early during continental breakup. Elevated melt production during continental rifting is likely due to localized thinning and melt focusing when the rift is narrow. In addition, we interpret segmented zones of melt supply beneath the rift, suggesting that buoyancy-driven active upwelling of the mantle initiates early during continental rifting.

Domains

Earth Sciences
Fichier principal
Vignette du fichier
ncomms13110.pdf (900.19 Ko) Télécharger le fichier
Origin : Publication funded by an institution
Loading...

Dates and versions

hal-01399024 , version 1 (18-11-2016)

Licence

Attribution

Identifiers

Cite

Ryan J. Gallacher, Derek Keir, Nicholas Harmon, Graham J Stuart, James O.S. Hammond, et al.. The initiation of segmented buoyancy-driven melting during continental breakup. Nature Communications, 2016, 7, pp.13110. ⟨10.1038/ncomms13110⟩. ⟨hal-01399024⟩
362 View
70 Download

Altmetric

Share

Gmail Facebook X LinkedIn More