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Marlina A. ELBURG

Sources and processes in arc magmatism: the crucial role of water (An inaugural lecture to the Society)

(volume 13 (2010) — number 3)
Article
Open Access

Document(s) associé(s)

Annexes

Mots-clés : partial melting, subduction, crystal fractionation, volcanism

Abstract

Arc magmatism distinguishes itself from magmatism in other tectonic settings by the crucial role that water plays in its petrogenesis. Water influences the geochemistry of the sub-arc mantle, by transferring fluid-soluble elements from the slab into the mantle. Water probably also carries the oxidised signature from the slab into the mantle wedge. The ubiquitous negative Ti-anomaly in arc magmas may reflect an increase of the compatibility of titanium in the solid residue during partial melting in water-bearing peridotite. Finally, water also has a strong influence on the identity of minerals involved in crystal fractionation processes, and gives rise to the low-Fe (calc-alkaline) fractionation trend by lowering the temperature at which the silicates start crystallising, without influencing the crystallisation temperature of iron-oxides.

Pour citer cet article

Marlina A. ELBURG, «Sources and processes in arc magmatism: the crucial role of water (An inaugural lecture to the Society)», Geologica Belgica [En ligne], volume 13 (2010), number 3, 121-136 URL : http://popups.ulg.be/1374-8505/index.php?id=2830.

A propos de : Marlina A. ELBURG

Department of Geology and Soil Science, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium. E-mail: Marlina.Elburg@ugent.be