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Specific structure of convection currents in the system layered intrusion-feeding conduit-parental magma chamber

L. Sh. Bazarov, V. I. Gordeeva and E. I. Petrushin
Specific structure of convection currents in the system layered intrusion-feeding conduit-parental magma chamber
Russian Geology and Geophysics (December 2007) 48 (12): 1037-1045

Abstract

The structure of convection currents was experimentally studied in the model system layered intrusion-feeding conduit-parental magma chamber. Persistent hydrodynamical and thermophysical interaction between interrelated melts of the parental magma and intrusive body occurs through the feeding conduit. Being associated, they control the structure of convection currents and mechanisms of heat and mass transfer in the intrusive, conduit, and magma chamber. The existence of two convection countercurrents in the conduit has experimentally been established: inner central lifting jet and outer annular downward current along the conduit walls. At the top of the conduit, the downward current has the lowest temperature and appears to be quite in equilibrium with the earlier precipitated crystals. Moving downward along the conduit wall, the annular descending current interacts with the lifting jet and, as a result, becomes hotter and undersaturated relative to the crystals that formed before. Thus, there is no possibility for heterogeneous crystallization to occur on the walls of conduit. The experimentally simulated mechanism of melt interaction in a whole natural system rules out the possibility of formation of a zone of immobile melt with stable steady-state temperature stratification anywhere in the chamber's volume.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 48
Serial Issue: 12
Title: Specific structure of convection currents in the system layered intrusion-feeding conduit-parental magma chamber
Affiliation: Russian Academy of Sciences, Siberian Division, Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 1037-1045
Published: 20071210
Text Language: English
Publisher: Allerton Press, New York, NY, United States
Accession Number: 2019-002597
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Based on Publisher-supplied data
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
Update Code: 201902
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