engleski

Determination of Recent Movements of Lithosphere in Regions with Chemogenic Sediments on the Surface in the Dinarides Region - Preliminary Results

In the area of carbonate or karst Dinarides, besides the dominant carbonate rocks and subordinate clastics, in many places more significant masses of chemogenic sediments can be found, represented by gypsum and anhydrite. In the Croatian part of the Dinara mountains such phenomena are most frequent in the area of Knin, Vrlika, Sinj and Drniš. As chemogenic sediments are specifically lighter than overlying rocks, during the long geological history they have been trying to achieve isostatic equilibrium or to get out on the ground surface. Recently, , a larger tectonic activity has been noted in areas with Chemogenic sediments, rather than in the wider environment. This is certainly reflected in increased vertical and tangential displacements along major faults in relation to the surrounding area, that are built mainlyof carbonate deposits. Determining the amount of movement of diapiric bodies as absolute and relative, would precisely assist the understanding of the tectonic movements and recent structural relations in a wider area. The goal of this paper is to present the preliminary results of a 2-year research of geodynamic shifts in the area between Knin and Sinj. The measurements were carried out through 3 GPS campaigns (every 6 months) on 8 geodetic points, which were stabilized in the area of interest with forced centering of GPS antenna above the points, in order to enable maximum measurement accuracy. The computer processing of GPS measurements was made with the scientific software GAMIT/GLOBK, the software package for analysis of GPS measurements developed at the Massachusetts Institute of Technology (MIT), particularly for the determination of geodynamic movements, designed primarily for the research of the Earth's crust deformation. The representation and visualization of the results were made using the programs - Generic Mapping Tools and Surfer, where shifts and the preliminary movement model are clearly shown.

GAMIT/GLOBK; geodynamics; GPS; movements; tectonics; Dinarides

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