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Title: Palaeomagnetic studies of the Mesozoic-Tertiary tectonic evolution of Cyprus, Turkey and Greece
Author: Morris, A.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1990
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Palaeomagnetic studies have been carried out in three key regions of the eastern Mediterranean part of the Tethyan orogenic belt. Within the Troodos ophiolite of Cyprus, samples were collected from extrusives and sediments exposed along the Arakapas fault belt and around the periphery of the Limassol Forest block. These areas represent crust which formed in the Upper Cretaceous within a 'leaky' oceanic transform fault, and also a small fragment of crust generated at an 'Anti-Troodos' spreading axis. Significant clockwise intra-crustal rotations of small fault-bounded blocks have been identified within the inferred transform zone. These rotations are shown to be syncronous with crustal genesis and indicate a probable dextral sense of shear along the transform. In contrast, the 'Anti-Troodos' crust appears to have undergone an identical rotation to the non-transform tectonised Troodos crust to the north. Variations in declination upwards through the umber-radiolarite sequences overlying the extrusives demonstrate that 45o of the 90o palaeorotation of the Troodos microplate occurred within 15 Ma of formation of the Troodos crust. A wide-spread remagnetisation event has been identified in the Isparta angle region aof SWQ Turkey. Sites were located both within the Tauride carbonate platform massif's and in the overthrust units of the Antalya Complex. The latter consists of an assemblage of continental margin and ophiolitic rocks which originated in a strand of the Neotethys located to the south of the carbonate platforms. The secondary nature of the remanence at most sites is demonstrated by several negative fold tests. The magnetisation is carried by magnetite of presumed authigenic origin. The remagnetisation event was probably triggered by the migration of orogenic fluids ahead of the Antalya Complex during its emplacement onto the adjacent platforms in the Lower-Middle Miocene. Subsequent to remagnetisation, a large segment of the area underwent an anticlockwise rotation of 30o. This rotation was probably related to the Neotectonic bending of the Hellenic arc and the emplacement of the Lycian Nappes during the Middle-Upper Miocene. This research has identified block rotations in a variety of geological settings. These range from rotations active during oceanic crustal genesis to those associated with the late stages of continental collision. These rotations would have been impossible to identify by means of field structural studies alone. An awareness of such rotational deformation is essential if the geological evolution of complex areas is to be fully understood.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available