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Crustal control on the Terek-Caspian Trough evolution: Constraints based on a new paleotectonic analysis method
Erscheinungsjahr
1993
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
The evolution of the Terek-Caspian Trough is investigated using a numerical paleotectonic analysis method based on expanding the tectonic velocity into a series of functions that depend on spatial coordinates and time. The method relies on the same kind of data as backstripping analysis, including the thicknesses of the sedimentary strata, their formation periods and facies composition (depth of deposition). It allows investigating the rate of motion in greater detail than conventional methods, and under certain conditions may be used to estimate the rate of movements not only for periods of sedimentation, but for periods of erosion as well, and also to determine the position of deep-seated faults, their periods of activity and amount of slip. The analysis has shown that, for the Terek-Caspian trough, it is possible to represent the rate of motion as a sum of two components: the overall motion of the entire profile proportional to the square root of time, and the local component as a function of time and distance along the profile. With regard to the local component, the profile subdivides into two parts, northern and southern, which have tended to be involved in vertical motion of the respectively opposite senses. These parts are separated by a deep-seated fault. This fault has controlled the trough evolution for at least 180 Myr. The antiphase movement of its sides may be explained by assuming that the fault plane is inclined: a regional compression would then drive one side up and the other down. As the compression is removed or changed over by an extension, the sense of movement will be the opposite. Under the assumption that the fault plane plunges beneath the Caucasus, the phases of compression appear to have occurred 120-140 Myr and 50-75 Myr ago.