DBPapers
DOI: 10.5593/SGEM2015/B11/S1.019

FAULT-RELATED FLUID FLOW WITHIN SUBCARPATHIAN NAPPE (EAST CARPATHIANS) DOMAIN DURING POST-COLLISION STAGE

M.Nutu-Dragomir, O. Vaselli
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 141-150 pp

ABSTRACT
At the end of the Sarmatian, the continental collision between the East European and Tisza-Dacia plates triggered the uplift of the Subcarpathian nappe together with other nappes belonging to the fold-and-thrust belt of the East Carpathians (Romania). During collision and post-collision stages, a wide system of thrusting faults and microfractures developed within the Miocene siliciclastic and evaporite deposits of the Subcarpathian nappe. Different fracture-filling cements associated with this system evidenced that faults and microfractures acted as conduits for fluid migration. The relationship between faults, fluid flow and fracture-filling cement was investigated by petrographic and structural analysis of selected outcropping samples, combined with elemental and isotopic geochemistry and microthermometry on fluid inclusions. The fluid migration occurred synchronously with both the development of major faults and the uplift of the Subcarpathian nappe. Some of these faults were the preferential pathways for the uprising fluids until the end of the Pliocene.

Keywords: fault system, fluid flow, geochemistry, compressive tectonics, East Carpathians

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