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Exsolution |
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Ex`so`lu´tion
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2]O saturation occurs by exsolution of an aqueous fluid to forma distinct phase in the silicate melt, at which point the fluid boils and gas bubbles form. There is no kinetic barrier to heterogeneous nucleation of bubbles; therefore, the exsolution surface (level in the chamber or conduit) is synonymous with the saturation surface because volatiles exsolve during magma ascent (Fig. The miscibility gap is narrower at high temperatures, so that under slow cooling conditions, early formed augites and low-Ca pyroxenes develop exsolution lamellae as low-Ca pyroxene and augite (respectively) are expelled from the structures. |
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