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The structural position and age of eclogite rocks in the area of Gridino village in the Belomorian mobile belt
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The structural position and age of eclogite rocks in the area of Gridino village in the Belomorian mobile belt
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The structural position and age of eclogite rocks in the area of Gridino village in the Belomorian mobile belt
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Journal Article
The structural position and age of eclogite rocks in the area of Gridino village in the Belomorian mobile belt
2015
Overview
Data on the localization of eclogitized mafic bodies in steeply and superposed gently dipping ductile shear zones in the area of Gridino village are considered. The process of eclogitization in steeply dipping ductile shear zones, which affect basites of rootless bodies (fragments of tectonic mélange) and dikes, was determined by deformations. Such a relation between them is most evident in narrow ductile shear zones that cross Early Proterozoic (age of ca. 2.4 Ga) gabbronorite dikes. Gabbronorites involved in deformations of ductile shear zones experienced eclogitization, reflected in the total recrystallization of magmatic minerals with the formation of equilibrium high-pressure mineral parageneses, ordered metamorphic textures, and linear strain patterns. Synchronous metamorphic transformations in gabbronorites, which avoided plastic deformations and retained massive structures (in wall rocks of shear zones) resulted in the formation of reaction coronas at the boundaries of magmatic mineral grains. Younger Fe gabbro dikes, localized in steeply dipping ductile shear zones, which cross gabbronorite dikes, are totally eclogitized. This determines the temporal lag between the formation of gabbonorite dikes and eclogitization in steeply dipping ductile shear zones and indicates its Svecofennian age. As in steeply dipping ductile shear zones, eclogitized basites constituting rootless bodies in their gently dipping counterparts are characterized by ordered metamorphic textures indicating the deformation nature of eclogitization. Gently dipping ductile shear zones are never crossed by Early Proterozoic basite dikes, although they contain boudins of them, which implies the younger (Svecofennian) age of these zones. The absence of eclogitization features in flat ferruginous basite bodies, which take part in the structure of gently dipping ductile shear zones and demonstrate orientation of metamorphic structures similar to that of gneisses, indicates that bodies of eclogitized basites were involved into these zones after eclogitization. An Archean age of these seems unlikely, since rootless bodies of eclogitized basites are never crossed by Proterozoic basite dikes in the study area. The textural data imply the deformation nature and Svecofennian age of eclogitized basites of the area of Gridino village.
