Thermal and compositional evolution of a cooling magma chamber by boundary layer fractionation: Model and its application for primary magma estimation

Details Thermal and compositional evolution of a cooling magma chamber by boundary layer fractionation: Model and its application for primary magma estimation Thermal and compositional evolution of a cooling magma chamber by boundary layer fractionation: Model and its application for primary magma estimation

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2029k&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 13, p. 2029-2032

Physics

1

Mineralogy And Petrology: Igneous Petrology, Mineralogy And Petrology: Major Element Composition, Volcanology: Physics And Chemistry Of Magma Bodies

Scientific paper

A boundary layer fractionation model for the thermal and compositional evolution of a basaltic magma chamber is presented. The model utilizes a multicomponent thermodynamic approach for relating the compositional structure with the thermal structure of a cooling magma body. The magma composition in the main magma body evolves by transportation of a fractionated interstitial melt from the mushy boundary layer. The consideration of both the thermal and compositional evolution of the magma body enables a realistic simulation of magmatic differentiation as a function of time and space. The model is used to evaluate a primary magma estimation from volcanic rock series. It is shown that the common procedure of olivine addition gives an estimation which is significantly different from the true primary composition if the magma actually differentiated by boundary layer fractionation. This can cause significant errors in estimating the conditions at which the primary magma was generated.

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