Skip to Main content Skip to Navigation
Journal articles

Experimental Constraints on the Formation of Silicic Magmas

Bruno Scaillet 1, 2, * Francois Holtz 3 Michel Pichavant 1, 2 
* Corresponding author
2 Magma - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
Abstract : A rich history of experimental petrology has revealed the paths by which silicic igneous rocks follow mineral–melt equilibria during differentiation. Subdividing these rocks by ‘molar Al versus Ca + Na + K’ illustrates first-order differences in mineralogy and gives insight into formation mechanisms. Peraluminous magmas, formed by partial melting of sediments, largely owe their attributes and compositions to melting reactions in the protoliths, whereas most metaluminous felsic magmas record both continental and mantle inputs. Peralkaline rhyolites are mainly derived from either protracted crystallization or small degrees of partial melting of basalt, with only a marginal crustal contribution. Most silicic magmas hold 3–7 wt% H2Omelt, which is inversely correlated with pre-eruptive temperature (700 °C to >950 °C) but unrelated to their reduced/oxidized state.
Complete list of metadata
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, March 26, 2021 - 3:55:35 PM
Last modification on : Tuesday, May 10, 2022 - 3:25:02 PM
Long-term archiving on: : Sunday, June 27, 2021 - 6:57:05 PM


Files produced by the author(s)




Bruno Scaillet, Francois Holtz, Michel Pichavant. Experimental Constraints on the Formation of Silicic Magmas. Elements, GeoScienceWorld, 2016, 12 (2), pp.109-114. ⟨10.2113/gselements.12.2.109⟩. ⟨insu-01310808⟩



Record views


Files downloads