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Full-Text Articles in Physical Sciences and Mathematics
Clay Mineral Association In The Salt Formation Of The Transylvanian Basin And Its Paleoenvironmental Significance, Nicoleta Bican-Bris̡An, Alexandru Hosu
Clay Mineral Association In The Salt Formation Of The Transylvanian Basin And Its Paleoenvironmental Significance, Nicoleta Bican-Bris̡An, Alexandru Hosu
Studia UBB Geologia
The investigated clay fraction was separated from salt samples recovered from three boreholes located in the Praid salt deposit area. For comparison, samples collected from Turda deposit (Franz Josef adit, the Rudolf and Ghizele chambers) and from the salt massif from Sărăţel were also analyzed. The qualitative investigations evidenced a clay minerals association dominated by illite and chlorite accompanied by subordinate amounts of kaolinite, smectite, fibrous clays (sepiolite, palygorskite), and in minor amounts, by 14/14 chlorite/vermiculite and chlorite/smectite interstratifications. A quantitative evaluation (%) including a standard graphical representation was performed only for the borehole samples (Praid), according to the vertical …
Note On A Meteor Fall Near The Oradea Fortress At The End Of The Xviith Century, Mihai Georgița
Note On A Meteor Fall Near The Oradea Fortress At The End Of The Xviith Century, Mihai Georgița
Studia UBB Geologia
During the preparation of a new siege of the Austrian imperial army upon the Oradea fortress - still occupied by the Turks, an astronomical event was noticed by the high rank officers. At the end of a long war report forwarded by general Veterani to Emperor Leopold II on the 20th of April 1692, a brief version of a note by general Auersperg on this meteor fall was also included. There he mentioned about a “fire ball” that was noticed in the skies on April 8th around 10 p.m., that went beyond the blockade, fortress and the army forefront, and …
The Miocene Calcareous Nannofossils From Bistriţa Area (Transylvania, Romania), Carmen Chira, Ana-Maria Vulc
The Miocene Calcareous Nannofossils From Bistriţa Area (Transylvania, Romania), Carmen Chira, Ana-Maria Vulc
Studia UBB Geologia
The Middle Miocene (Badenian, Sarmatian and Pannonian) deposits from the region of Bistriţa, between the localities: Susenii Bârgăului, Livezile, Bistriţa, Sărata, Sărăţel, Budacu de Sus (Transylvanian Basin) have been analysed from the nannofloral point of view. The nannofossils are relatively scarce, excepting the ones related to Lower Badenian deposits. Only the fossil index for NN5 Zone – Sphenolithus heteromorphus, and for NN6 Zone – Discoaster exilis have been identified.
A Review Of The Eocene Diodontids And Labrids From Transylvania, Emanuel Paul Dica
A Review Of The Eocene Diodontids And Labrids From Transylvania, Emanuel Paul Dica
Studia UBB Geologia
This paper reviews two diodontids and labrids species: Chylomicterus hilgendorfi and Lachnolaimus multidens. The paleontological material is represented only from jaws and pharyngeal bones, which had been recently collected from Cluj Limestone (Cluj Napoca and Turbut̡a areas), and Nis̡ului Valley Formation (Turnu Ros̡u) as well as from older collections. The holotypes of these species are reconsidered and the paleoecological significances are also discussed.
Coralgal Facies Of The Upper Eocene-Lower Oligocene Limestones In Letca-Rastoci Area, Ioana Prica
Coralgal Facies Of The Upper Eocene-Lower Oligocene Limestones In Letca-Rastoci Area, Ioana Prica
Studia UBB Geologia
In this paper are described the coralgal facies identified in the Upper Eocene-Lower Oligocene limestone succession (Cozla Formation) outcropping in two quarries at Letca and Rastoci (Sălaj district, Romania). In the studied profiles the coral and algae limestones are interlayered with bioclastic limestones with foraminifera. On the top of relatively deep water deposits, coral and algae crusts and dendritic corals coated by algae were deposited. The environment registered a gradual deepening, the deposits being completely immersed, while bioclastic limestones with foraminifera were recurrently formed. This cycle is repeated, the whole succession being caracterized by several such “parasequences”.
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. …