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MICROSTRUCTURAL AND KINEMATIC ANALYSE OF GOLESHI ULTRABASIC MASSIF IN KOSOVA
Abstract
Peridotite massif of Goleshi is representative of the dippiest mantle section of Vardari oceanic lithosphere: The characteristics of deep mantle peridotite are: the total lack of pyroxenite dyke series, the total lack of the gabbroic dyke series, the lack of the chromites ore bodies, presence of rare and small dunite lenses. Ophiolitic peridotite of the Goleshi massif set tectonically over metamorphic Paleozoic-Triassic series and is transgresivelly overlaid by Pliocene formations. The striking of the foliation is northeastwards and dipping northwestwards under 400. A northwards plunging lineation is measured in the foliation plane all over the massif. Microstructure analyzes have revealed the presence of the hartzburgite facies of porphyroclastic and myllonitic texture of low temperature (800-10000C) and a deviatory stress with values between 580 and 1100 bar. These micro structural features are characteristic for deformations of oceanic lithosphere, which occurred during convergence stage of upper Jurassic, the time when the intraoceanic break up started in/or close to the mid-oceanic ridge. The kinematical analyze reveals that the part of the oceanic lithosphere, which was in the west of this break up, is later transported from west towards east. This conclusion is in contrast with the all-previous geodynamic schemes as concerning the convergence and closure of Vardari ocean. This could be explained by a multiple fragmentation of Vardari oceanic lithosphere. Today most of geologists support the opinion that Vardari ophiolite represents a m\'elange and in addition the size of Goleshi massif is small, so it would be difficult to find arguments to support the opinion for a westwards dipping subduction. As a matter of fact this massif has no features to identify it as a m\'elange and our data strongly support the existence of a carriage through which is transported the western part towards east. Maybe the alpine carriage, which has transported this massif from north towards south, might have strongly modified the initial position of basal peridotites, which have registered here intraoceanic carriage stage.
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References9
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