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Full-Text Articles in Physical Sciences and Mathematics
Lower Cretaceous Limestones From The Northern Part Of Padurea Craiului (Osoiu Hill And Subpiatra Sections): Biostratigraphy And Preliminary Data On Microbial Structures, Hyam Daoud, Ioan I. Bucur, Emanoil SăSăRan, Ioan Cociuba
Lower Cretaceous Limestones From The Northern Part Of Padurea Craiului (Osoiu Hill And Subpiatra Sections): Biostratigraphy And Preliminary Data On Microbial Structures, Hyam Daoud, Ioan I. Bucur, Emanoil SăSăRan, Ioan Cociuba
Studia UBB Geologia
Two sections have been measured within the Lower Cretaceous deposits from the northern part of Pădurea Craiului: Osoiu Hill section and Subpiatră section. Thin sections representing more than 180 samples allowed us to present some results on the biostratigraphy, facies succession and the role of microbial structures in the genesis of these limestones. The Osoiu Hill section is dominated by fenestral limestones formed in the intertidal or in the shallow subtidal zone. Their formation is dominantly related to microbial mats. Based on foraminiferal assemblages we attribute a Lower Barremian age to these limestones. The succession in the Subpiatra section is …
The Mesozoic Carbonate Deposits From The Borehole 6042 Deleni (Transylvanian Depression), Ioan I. Bucur, Marcel-Adrian Piteiu, Emanoil SăSăRan
The Mesozoic Carbonate Deposits From The Borehole 6042 Deleni (Transylvanian Depression), Ioan I. Bucur, Marcel-Adrian Piteiu, Emanoil SăSăRan
Studia UBB Geologia
The borehole 6042 Deleni is among the few wells located in the central part of the Transylvanian Depression that crossed the rocks in the basement. Among these, the Mesozoic deposits were cross-cut along 916 m. Based on the investigations carried out on core samples from the Mesozoic deposits three carbonate units attributed to the Late Oxfordian -Tithonian (?Neocomian) have been separated. A preliminary evaluation of the terrigenous and carbonate-terrigenous deposits overlaying the carbonate ones indicated an Aptian-Albian, respectively Senonian age. Considerations on the paleoenvironment of the Mesozoic deposits studied are also presented.
Carbon And Oxygen Isotope Ratios In Rona Limestone, Romania, Stela Cuna, Dana Pop, Alexandru Hosu
Carbon And Oxygen Isotope Ratios In Rona Limestone, Romania, Stela Cuna, Dana Pop, Alexandru Hosu
Studia UBB Geologia
The carbon and oxygen isotopic compositions of limestones provide criteria for the evaluation of the depositional environment. For Jurassic and younger samples, the best discrimination between marine and fresh-water limestones is given by Z parameter, calculated as a linear correlation between δ13C and δ18O (‰ PDB). Rona Limestone (Upper Paleocene - Lower Eocene), outcropping on a small area in NW Transylvania (Meseş area) is a local lacustrine facies. There, it divides Jibou Formation into the Lower Red Member and the Upper Variegated Member, respectively. Recently, a sequence containing a marine nannoplankton assemblage was identified in the base of Rona deposits. …