Geoinformatika 2018; 2(66) : 48-59
УДК 551.24.052
ON THE ISSUE OF THE BORDER KINEMATICS OF THE ADJACENT PLATES
S.V. Goryajnov
Ukrainian Scientific Research Institute of Natural Gases (UkrNIIgas)
Purpose. The relative motions of lithospheric plates are traditionally regarded as spreading, subducting and transforming, with one or other shear components. This inevitably leads to notions of parallelism and opposites of vectors of their relative displacements. The analysis of the data shows a much greater variety of such combinations. Thus the purpose of the work is to identify a complete set of possible relative movements of plates, including both the relationships known so far and new ones.
Design/methodology/approach. In considering the kinematics of relative movements of lithospheric plates, we used a new methodological approach, which consists in analyzing not the movement of one plate relative to the other but the movement of both plates relative to their border. This approach required to expand the structural-geological terminology. The updated terminology made it possible to formalize the orientation of the plate movements, further operating with them in symbolic form.
Findings. Eight variants for the movement of the plate relative to its boundary were selected. In combination with eight of the same variants of the opposite plate motion, 64 combinations have been obtained. After rejecting the variants symmetrical with respect to the change of the observation point (on one plate or on another), there remain 36 unique variants of combinations of the direction of plates movement relative to their overall border. The analysis has shown that 8 of them are well-known, 4 reflect the variants of displacement of ancient (inactive) boundaries without the relative displacement of plates, and 24 are new to geodynamic theory.
Verification of the received result was carried out by defining the combinations of plates movement in the district, taking into account the data on their movements. For 18 theoretically calculated new variants, we have shown the areas of their modern implementation in different regions of the world; other 6 variants have not been found yet, their discovery being a matter of time.
Practical value/implications. The results obtained allow us to move over to the analysis of interaction of multidirectional mantle flows.
Keywords: lithospheric plates, tectonic movements, spatial features.
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