The Alps as the main source of sand for the Late Miocene Lake Pannon (Pannonian Basin, Croatia)

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Mario Matošević
Eduardo Garzanti
Sanja Šuica
Danilo Bersani
Frane Marković
Ivan Razum
Anita Grizelj
Krešimir Petrinjak
Marijan Kovačić
Davor Pavelić


The provenance of the Upper Miocene sandstones from the Sava and Drava depressions of the North Croatian  Basin was investigated using petrographic, geochemical, and heavy mineral analyses, including Raman  spectroscopy. The study of these sandstones, which represent important oil and gas reservoirs in Croatia,  allowed reconstruction of the Late Miocene source-to-sink model of the Lake Pannon drainage system and the  evolution of the southwestern Pannonian Basin. The studied feldspatho-litho-quartzose sandstones consist of a  mixture of sedimentary, metamorphic, and igneous detritus. Heavy-mineral assemblages are dominated by  almandine-rich garnet with apatite, epidote, tourmaline, rutile, zircon, staurolite, and zoisite, indicative of low to  medium-grade metamorphic source rocks. Higher concentrations of Ca and Mg than in the Upper Continental  Crust standard (UCC) additionally reflect the abundance of limestone and dolostone rock fragments as well as carbonate cement. Geochemical compositional variations between sandstone samples from the Sava and Drava  depressions primarily stem from diagenetic processes. CIX and alpha values indicate only minor  weathering. Compositional features indicate an orogenic source located in the Eastern Alps and primarily  represented by Austroalpine and Penninic nappes. This research offers a novel perspective to distinguish the  Upper Miocene reservoirs from other sedimentary units within the basin, contributing to a more comprehensive understanding of the regional geological dynamics and supporting future exploration projects also related to  energy transition. 


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