Post-metamorphic palaeofluid evolution of the Mecsekalja Zone metamorphic complex

Dabi Gergely
Post-metamorphic palaeofluid evolution of the Mecsekalja Zone metamorphic complex.
PhD, University of Szeged.

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Abstract in foreign language

The thesis held in hand discusses the post-metamorphic palaeofluid evolution of the crystalline metamorphic rocks of the Mecsekalja Zone, near Ófalu village, south Hungary. The rocks of the study area now observable at surface outcrops were metamorphosed ca. 300 ma ago. During its uplift history a complex stress evolution must have worked upon the rock mass, the most momenta of which can hardly be recognized, and the most phases of which possibly did not leave an inquirable clue. Crystalline rocks can be considered impermeable, and it is the deformation of the rock that enhances the efficiency of fluid flow, both at the micro- and the mesoscale. The stress activated microscale porosity is testified by fluid inclusion planes in granites and also by rock mechanic experiments. Veins of different configurations are the mesoscale product of deformation and subsequent fluid flow in the newly grown fracture porosity. The above considerations suggest that the uplift history of the Ófalu metamorphic complex is also a complex palaeofluid history, the momenta of which are determined by the obscure stress history of the Mecsekalja Zone. These momenta can be reconstructed by minerals that were precipitated from fluids, i.e. vein minerals or minerals that are obviously not part of the original mineral assemblage and the hydrothermal origin of which can be reasonably assumed, e.g. microcrack calcite in a quartzofeldspathic gneiss. The present thesis is an attempt to reconstruct the phases of the fluid evolution during the post-metamorphic history of the Mecsekalja Zone metamorphic zone and to extract the nexus of these with the application of the available methods and data, i.e. textural analysis (augmented with cathodoluminescence microscopy), fluid inclusion microthermometry and stable isotope measurements.

Item Type: Thesis (PhD)
Creators: Dabi Gergely
Hungarian title label: A Mecsekalja Zóna kristályos komplexum posztmetamorf paleofluidum evolúciója
Title of the thesis in foreign language: Post-metamorphic palaeofluid evolution of the Mecsekalja Zone metamorhic complex
Divisions: Doctoral School of Geosciences
Discipline label: természettudományok > földtudományok
Defence date label: 2013. May 27.
Item ID: 1723
Identification Number: 2894224
Date Deposited: 2013. Feb. 19. 08:12
Last Modified: 2015. May. 19. 13:15
Depository no.: B 5543
Supervisor label:
Supervisor Supervisor scientific name label
Dr. M. Tóth Tivadar
Dr. Schubert Félix
egyetemi tanár, az MTA doktora, SZTE TTIK Ásványtani, Geokémiai és Kőzettani Tanszék
adjunktus, Ph.D., SZTE TTIK Ásványtani, Geokémiai és Kőzettani Tanszék
Reviewer label:
Reviewer name label Reviewer scientific name label
Dr. Török Kálmán László
Dr. Koroknai Balázs
tudományos főmunkatárs, Ph.D., Magyar Állami Földtani és Geofizikai Intézet
vezető geológus, Ph.D., Geomega Kft.
President label:
President name label President scientific name label
Dr. Hetényi Magdolna
akadémikus, SZTE TTIK Ásványtani, Geokémiai és Kőzettani Tanszék
Member label:
Member name label Member scientific name label
Dr. Fodor László
Dr. Raucsikné dr. Varga Andrea
tudományos tanácsadó, az MTA doktora, MTA-ELTE Geológiai Kutatócsoport
tudományos munkatárs, Ph.D., SZTE TTIK Ásványtani, Geokémiai és Kőzettani Tanszék
Defence/Citable status: Defended.

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