Sustainable Geological Insights from the Petrographical Study of Jurassic Limestone Cores in the Caragele Structure (Buzau County, Romania)

Abstract

The Jurassic formation, west of Capidava-Ovidiu fault, to the north-eastern part of the Moesian Platform, is known relatively little from a petrographic standpoint, an impediment being the insufficient sampling of rock probes. This area of the platform is tectonically active and is part of the Vrancea Seismic Zone, the reason for which numerous studies focused on this aspect rather than other details. The Moesian Platform has long been studied for its hydrocarbon potential,  but this feature is in the western part and in isolated areas belonging to the center. The eastern sector, and north-eastern part where our study is conducted, have not been studied in depth due to their correspondence with the Central Dobrogean formations of the same age, for which various studies have been  conducted.  Our findings  reveal  the presence of bioturbations  during sedimentations which had as result a slight increase in clay material and organic matter in the initial deposits. Also, simultaneously with the recrystallized carbonate as microsparite, small quantities of detrital siliciclastic, somewhat coarser, carbonates have sedimented which resulted in formation of porous space. 

Keywords: Eastern Moesia, microsparitic carbonate, bioturbations, crystalline limestone, porous lenticles