Identification of geodynamic setting and of folding formation mechanisms using of strain ellipsoid concept for multi-scale structures of Greater Caucasusстатья

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[1] Yakovlev F. Identification of geodynamic setting and of folding formation mechanisms using of strain ellipsoid concept for multi-scale structures of greater caucasus // Tectonophysics. — 2012. — Vol. 581. — P. 93–113. For recognition of folding formation mechanisms and of geodynamic setting of development of inner parts of mobile belts, the idea of a deforming description with use of parameters of strain ellipsoid is used. Such description includes for a separate fold a dip of an axial plain and a shortening value in axis perpendicular to axial plain as strain ellipse axes. For a homogeneous series of folds (folded domains) there are three parameters: folds shortening value, axial plain dip (axes of strain ellipsoid) and dip of folds envelope plain. Folds in the Vorontsov nappe of North-West Caucasus were investigated. Possible trends of change of parameters “dip of axial plain”/“shortening value” have been described and compared for two kinematic models: lateral shortening (flattening) and simple horizontal shearing. Trend of natural fold strain parameters has shown the coincidence with horizontal simple shearing trend which corresponds to gravitational sliding in geodynamic relation. Distinctions in formation mechanisms of small and large structures are discussed. Large structures (tectonic zones) should be split on a series of folded domains. Aggregate description of deformations of these domains helps to give the characteristic of complicated mechanisms in models and in nature. Several different types of experiments were investigated. It was shown that different mechanisms have specific clouds of domain geometry in 3D space of three parameters. Discrepancies of such clouds were used as key features for mechanisms identification. Mechanisms of lateral pressure, gravitational sliding, theoretical and experimental models of diapirism, numerical model of mesobuckling are shortly described. Structural cross-sections for main three zones of the Greater Caucasus have been described using strain parameters of domains. Conventional models of accretionary prism type have not been confirmed. Complex mechanism of mesobuckling combining with simple shearing in “near-thrust” inclined zones well describes the structure in a first approximation. [ DOI ]

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