Geologica Belgica

1374-8505

 

Impact factor: 1.041 (2012)

since 05 February 2011 :
View(s): 166 (4 ULg)
Download(s): 196 (4 ULg)
print
Marlina A. ELBURG

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

Article Open Access

Attached document(s)

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.

To cite this 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.ac.be/1374-8505/index.php?id=2830.

About: Marlina A. ELBURG

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