Evolution of deformation mechanism and fluid flow in two pre-rift siliciclastic deposits (Pannonian Basin, Hungary)

Distinct stages of deformation and fluid flow-related diagenetic alterations are recorded in Lower Miocene sandstone conglomerate the Pannonian Basin, Central Europe. Multiple generations structural elements (deformation bands, calcite dominoes veins) as well host rocks were investigated using petrographical, elemental stable isotope geochemical methods together with inclusion petrography microthermometry. The integration acquired data into a subsidence model constrains spatial temporal evolution mechanisms processes. six sites represent central marginal areas during both pre-rift syn-rift phases basin evolution. preserved at eastern margin, where eogenetic precipitated early types bands. Their ?18OPDB values from ?4.3‰ to ?1.9‰ paired ?13CPDB ?3.8‰ 1.8‰ refer precipitation connate marine mixed meteoric pore water. represented by start shallow mesogenetic position centre. ratios these calcites yielded ?15.2‰ ?5.7‰ ?18.5‰ -–1.6‰, respectively. gradual depletion heavy isotopes shows positive covariance progressed time. This trend is attributed an increasing proportion deeply circulating fluid. sporadic confirm contribution certain carbonate cement phases. distinguished mainly related intense that, increased rift-related heat flow, warmed up fluids. deviating general allow recognition local source light carbon basin-wide fluid-flow evolution, cannot be tied switch tectonic settings compression extension.