Replenishment of magma chambers: comparison of fluid mechanic experiments with field relations

Article Abstract:

The structures present in silicic magma chambers arise from a flow-front instability that occurs when the chambers are replentished by injections of basic liquids, which are denser but less viscous than the existing magmas. Crystallization of silicic liquids trapped between the lobes of basic liquid creates veins of silicic rock between the quenched lobes of mafic rock. Fluid-mechanics experiments seem to explain the process of replenishment of magma chambers accurately. The experimental methods and field applications are discussed.

Usage, Fluid mechanics, Magmatism

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Slow, dense replenishments of a basic magma chamber: the layered series of the Newark Island layered instrusion, Nain, Labrador

Article Abstract:

An analysis of the Newark Island layered instrusion is presented. The composite layered intrusion is an internal part of the Nain anorthosite complex in Labrador. Its lower layered series is composed of troctolites, olivine gabros and oxide-rich cumulates, while the upper hybrid segment is composed of diverse cumulates and mafic rock layers. It is shown that replenishments following oxide precipitation exhibited small injection velocities.

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Experimental study of liquid evolution in an Fe-rich, layered mafic intrusion: constraints of Fe-Ti oxide precipitation on the T-fO2 and T-gamma paths of tholeiitic magmas

Article Abstract:

An analysis of the Newark Island layered intrusion is presented. The analysis examines a single atmosphere liquid lines of descent which the intrusion composition bears. The composition is taken as a function of oxygen fugacity varying from quartz-fayalite-magnetite to 0.5 log10 units over iron-wustite. It is shown that Fe-Ti oxides exhibited vital influence on oxygen fugacity dependence.

Oxides, Thermal properties, Precipitation (Meteorology)

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