The direction of fluid flow during contact metamorphism of siliceous carbonate rocks; new data for the Monzoni and Predazzo aureoles, northern Italy, and a global review

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doi: 10.1007/s00410-001-0316-7
Authors:Ferry, John M.; Wing, Boswell A.; Penniston-Dorland, Sarah C.; Rumble, Douglas, III
Author Affiliations:Primary:
Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, MD, United States
Other:
Geophysical Laboratory, United States
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 142(6), p.679-699. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:2002
Note:In English. 71 refs.; illus., incl. 17 tables, geol. sketch maps
Summary:During contact metamorphism in the Monzoni and Predazzo aureoles, periclase was formed in siliceous dolomitic marbles by infiltration of carbonate rocks by H2O-rich fluids (500 bar, 565-710°C) whose vertically upward fluxes were ∼ 5000 and ∼ 300 mol fluid/cm2, respectively. These, and other data from 13 aureoles show fluid flow was mostly vertical, with no horizontal component directed away from the pluton. Only two examples were recorded of horizontal fluid flow into the aureole. Earlier suggestions of horizontal flow towards the pluton are probably explained by the incorrect assumption that widespread coexisting mineral reactants and products result from arrested prograde decarbonation reactions. Time-integrated fluid fluxes were 102-104 mol/cm2, and these values and the direction of fluid flow are consistent with hydrodynamic models of contact metamorphism. Whether fluid flow is vertical or horizontal depends mainly on the orientation of bedding and lithological contacts. [J.F.]
Sections:Petrology
Subsections:Metamorphism: thermal, metasomatic
Subjects:Aureoles; Chemical composition; Contact metamorphism; Fluid dynamics; Marbles; Metamorphic rocks; Metamorphism; Mineral composition; Prograde metamorphism; Siliceous composition; Alps; Dolomites; Eastern Alps; Europe; Italy; Predazzo Italy; Southern Europe; Trentino-Alto Adige Italy; Monzoni Italy
Coordinates:N461900 N461900 E0113700 E0113700
Abstract Numbers:02M/3585
Record ID:2002030959
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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