Shock-induced amorphous textures in plagioclase, Maniacouagan, Quebec, Canada
Article Abstract:
Samples of optically isotropic labradorite from the Manicouagan structure of Quebec, Canada were examined through light and transmission electron microscopy in order to show the processes of shock-induced plagioclase amorphization. Two distinct types of diaplectic glass were classified, maskelynite and planar deformation type, each of which was associated with distinct optical and electron microscopical features and in turn related to different stages in the shock-wave passage. Identification of the shock-wave stages through textural analysis showed the potential of reconstructing the complete compressional and decompressional shock history of minerals.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Fluid-rock interaction between syenites and marbles at Stephen Cross Quarry,Quebec, Quebec, Canada: petrological and stable isotope data
Article Abstract:
Petrological and stable isotope data were used to reconstruct the overall pattern of fluid flow in the Stephen Cross Quarry in Quebec, Quebec, Canada. It was found that the fluids flowed out from the Wakefield syenite into the Grenville marble. Fluid infiltration was attributed to contact metasomatism rather than regional metamorphism of the area as was shown by the occurrence of exoskarns in the marble close to the Wakefield intrusion. Analysis have indicated a highly variable magnitude and direction offluid flow and suggested the control of not only the lithologic differences butalso by variations in the secondary rock permeability.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1993
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Shock metamorphism and shock barometry at a complex impact structure: Slate Islands, Canada
Article Abstract:
Research was conducted to analyze the shock metamorphic features of uplifted target rocks in the central part of the Slate Islands complex impact structure. More than 100 quartz-bearing rocks were collected and observed with a petrographic microscope to examine the shock attenuation across the archipelago. Results showed that the shock attenuation across the archipelago's western portion has a gradient of about 4.5 GPa/km. Moreover, the orientation of planar features in quartz seems to be independent of the shock wave direction.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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