Tectonic stress as additional termodynamic factor of metamorphism (Northern Ladoga region)

Category: 16-1
A.L. Kulakovsky, Yu.A. Morozov, A.I. Smul'skaya


UDC 551.24.035


A.L. Kulakovsky, Yu.A. Morozov, A.I. Smul'skaya


Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia


Abstract. On the basis of natural observations and analytical researches of zonal metamorphosed Paleoproterozoic Ladoga complex in south-eastern part of Baltic shield the fault tectonites (stress-metamorphites) on metasedimentary rocks with abnormally high pressure (up to 12 kbar) and heightened temperatures in compare with the background settings of regional metamorphism were discovered. The features of structure and composition of the two groups of stress-metamorphites, belonging to different stages of the one strain-metamorphic phase, are described; some parameters and trends of each stress-metamorphism stages were determined. On this basis, the aspects of spatial and temporal correlation between the processes of metamorphism and deformation are being analyzed, and the possible role of tectonic stress as an additional and very important thermodynamic factor of metamorphic changes in the Earth's crust is estimated.


Keywords: tectonic stress; thermodynamics parameters, metamorphism; paleoproterozoic Ladoga complex.


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