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Formation of primary fluid inclusions under influence of the hydrodynamic environment

Manuel Prieto, Andres Paniagua and Celia Marcos
Formation of primary fluid inclusions under influence of the hydrodynamic environment (in Fluid inclusions, Carlos Ayora (prefacer))
European Journal of Mineralogy (October 1996) 8 (5): 987-996

Abstract

When crystals grow under convection conditions, the hydrodynamic environment can promote the formation of inclusions in the rear side of the crystals, downstream in relation to the fluid flow. An experimental study of this mechanism of fluid trapping is presented, and the conditions under which hydrodynamics influences growth behaviour are discussed. Crystal growth experiments have been carried out with aqueous solutions in a convection system under controlled conditions of temperature, solution velocity V (sub s) and supersaturation sigma (sub infinity) . Growth rates of {011} faces of ADP crystals have been measured for different orientations, in relation to the solution flow and for different values of sigma (sub infinity) and V (sub s) . It is concluded that hydrodynamics can produce an anisotropy in the contribution of material to crystallographically equivalent faces. At low solution velocities and moderate supersaturation, the growth rate depends on the flow "impact" angle. In contrast, at high solution velocities (V (sub s) > 3 cm.s (super -1) for sigma (sub infinity) = 2.45 %) the hydrodynamic configuration has no influence on the growth kinetics. Hydrodynamics can also play an important role in the formation of fluid inclusions during crystal growth. However, this effect only occurs at low solution velocities, when the growth kinetics is controlled by the hydrodynamic configuration. Crystals grown at low solution velocities (V (sub s) < 3 cm.s (super -1) for sigma (sub infinity) = 2.45 %) show large fluid inclusions in the rear zone. At high solution velocities the mass-transfer is high enough to avoid the hydrodynamic control of growth, and no inclusions are generated by this mechanism.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 5
Title: Formation of primary fluid inclusions under influence of the hydrodynamic environment
Title: Fluid inclusions
Author(s): Prieto, ManuelPaniagua, AndresMarcos, Celia
Author(s): Ayora, Carlosprefacer
Affiliation: Universidad de Oviedo, Departamento de Geologia, Oviedo, Spain
Pages: 987-996
Published: 199610
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: ECROFI XIII symposium on Fluid inclusions
Meeting location: Sitges, ESP, Spain
Meeting date: 19950621June 21-23, 1995
References: 27
Accession Number: 1997-006615
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199702
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