Rapid magma ascent recorded by water diffusion profiles in mantle olivine - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geology Année : 2006

Rapid magma ascent recorded by water diffusion profiles in mantle olivine

Résumé

Mechanisms and rates of magma ascent play a critical role in eruption dynamics but remain poorly constrained phenomena. Water, dissolved in mantle minerals as hydrogen and partitioned into the magma during ascent, may provide clues to quantifying magma ascent rates prior to eruption. We determined the dehydration profiles in olivine crystals from peridotite mantle xenoliths within the Pali-Aike alkali basalt from Patagonia, Chile. The results demonstrate that the amount of water stored in the uppermost mantle has likely been underestimated due to water loss during transport. Using experimental diffusion data for hydrogen, we estimate that the xenoliths reached the surface from 60–70 km depth in several hours, a surprisingly rapid rise comparable to ascent rates for kimberlite magmas.

Domaines

Volcanologie
Fichier principal
Vignette du fichier
93f3d4442b885a299b9e56c69036e2587b93.pdf (252.96 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00091693 , version 1 (29-11-2019)

Identifiants

Citer

Sylvie Demouchy, Steven D. Jacobsen, Fabrice Gaillard, Charles R. Stern. Rapid magma ascent recorded by water diffusion profiles in mantle olivine. Geology, 2006, 34, pp.429-432. ⟨10.1130/G22386.1⟩. ⟨hal-00091693⟩
113 Consultations
279 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More