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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Possible role of amphibole in the origin of andesite: some experimental and natural evidence. The influence of amphibole fractionation on the evolution of calc-alkaline andesite and dacite tephra from the central Aleutians, Alaska
- Abstracts: Petrogenesis of late stage magmatism at Hold with Hope, East Greenland. Petrogenesis and significance of late Caledonian granitoid magmatism in western Norway
- Abstracts: Boron in granitic magmas: stability of tourmaline in equilibrium with biotite and cordierite. Tourmaline in a low grade clastic metasedimentary rock: an example of the petrogenetic potential of tourmaline
- Abstracts: Genesis and evolution of low-Al orthopyroxene in spinel peridotite xenoliths, Grand Canyon field, Arizona, USA
- Abstracts: An enriched mantle source for potassic basanites: evidence from Karisimbi volcano, Virunga volcanic province, Rwanda