Abstract
The integration of the differential equation of the second law of Fick applied to the diffusion of chemical elements in a semi-infinite solid made it easier to estimate the time of stay of olivine megacrysts horted into alkaline lava. The results of this research show the existence of two groups of olivine. The first remained in contact with the magmatic liquid during 30 to 34 days, while the second remained so during only 4 to 7 days only. This distinction is correlative to that based on the qualitative observation.
Highlights
Megacryst-sized olivine crystals are common in alkaline lavas (Irving and Frey, 1984; Liotard et al, 1988)
Olivine megacrysts studied here are from Saghro mountain (Anti-Atlas, Morocco) (Ibhi, 1997) and from La Palma alkaline lavas (Canary Islands) (Dautria and Girod, 1987)
The origin of the olivine crystals is still debatable; most authors have divided them into two groups, according to their genetic relationship with the host lava (Irving, 1984; Long etal., 1993): 1. Most olivine megacrysts appear in approximate from equilibrium with the host lava (OlE)'
Summary
Megacryst-sized olivine crystals are common in alkaline lavas (Irving and Frey, 1984; Liotard et al, 1988). The origin of the olivine crystals is still debatable; most authors have divided them into two groups, according to their genetic relationship with the host lava (Irving, 1984; Long etal., 1993): 1. Most olivine megacrysts appear in approximate from equilibrium with the host lava (OlE)'. Different cationic exchange models between megacrysts and host lava give the diffusion profiles upon which Fick 's law is applied. The latter enables to calculate minerals period of stay in magmatic 1iquid
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