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Crystallization and oxidation during emplacement of lava lobes

By
Dorothee J.M. Burkhard
Dorothee J.M. Burkhard
1
Institute for Mineralogy and Geochemistry, University of Karlsruhe, D-76131 Karlsruhe, Germany, and Research Center Karlsruhe, Institute for Technical Chemistry, Water Technology and Geotechnology (ITC-WGT), D-76021 Karlsruhe, Germany
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Published:
January 01, 2005

Lava emplacement induces numerous processes, among which are crystallization and oxidation. While crystallization is mainly thermally driven, oxidation may be primary, or secondary if an environmental interaction is involved. Here, three major processes are considered, crystallization, volume oxidation, and a surface alteration that may result in surface oxidation, which has heretofore not been described. All these processes are shown to be high-temperature phenomena and they are not related to weathering. The nature of these processes and their quantification is elucidated by isothermal heat treatment experiments of quenched lava samples. This quantification allows scientists to delineate the thermal history of basaltic melts in relation to their textures; oxidation is suggested to be a consequence of crystallization; surface alteration involves cation migration to lava surfaces in the presence of an oxygen gradient, resulting in surface oxidation if the migrating cation is iron.

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Contents

GSA Special Papers

Kinematics and dynamics of lava flows

Michael Manga
Michael Manga
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Guido Ventura
Guido Ventura
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Geological Society of America
Volume
396
ISBN print:
9780813723969
Publication date:
January 01, 2005

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