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Title: Structural and tectonic evolution within the envelope and margins of the Volvi Complex, N.E. Greece
Author: Batty, Steven Douglas
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1993
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The Serbo-Macedonian Massif (SMM) is a complex metamorphic and tectonic terrane, possessing an early poorly constrained (Hercynian?) deformation history, extensively overprinted by several Mesozoic deformation events. This study has focused on part of the eastern margin of the SMM of NE Greece, covering an area approximtaely 400 km2 to the north of Lake Volvi, 50 km east of Thessaloniki. This project has concentrated on determining the origin and geological setting of a large body of metamorphosed sheeted dykes and gabbros (the Volvi Complex) emplaced within this polymetamorphic massif, by focussing on the structural history of its marginal zone, envelope and off-shoots. By this means a progressive polyphase strain-partitioned structural history (Mesozoic) has been determined, overprinting an older highly deformed (Hercynian?) migmatitic basement. The Mesozoic deformation provides the dominant structures within the area which have resulted in the development of low-strain pods wrapped in three dimensions by high-strain anastomosing shear zones. The high-strain zones are associated with extensively retrogressed greenschist-facies assemblages, whereas areas of low-strain preserve evidence for peak upper amphibolite-facies conditions and thermal perturbations into the granulite facies. Granulite-facies conditions are shown by the overprinting of cordierite bearing melt assemblages developed in association with early extensive mafic intrusions at low-P, high-T conditions. Evidence from local melting and geochemical studies have suggested a mechanism of crustal anatexis for the granitoids within the study area. Pseudomorphing of cordierite by kyanite-garnet-biotite assemblages and the development of garnet-bearing coronas in gabbros suggests that the initial P-T conditions were promoted to regional peak amphibolite-facies (high-P, medium-T) conditions. Evidence of a range of early to late intrusive basic bodies is provided by field observations of small medium- to coarse-grained gabbros intruding extensive areas of amphibolite and sheeted dykes which is indicative of continued intrusion during crustal thickening. Geochemical analysis of basic rocks show the Volvi mafic suite to be derived from a range of primitive sources, with possible arc components, which have been subjected to varying degrees of partial melting, subsequently modified by fractionation processes.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available