No abstract
Terra Nova, 23, 134–144, 2011 Abstract A palaeomagnetic study carried out at 33 geographically distributed localities in the Miocene fill of the 600‐km‐long Moravian and Polish segment of the Carpathian Foredeep revealed an overall more than 20° CCW rotation of the area. These new palaeomagnetic results can be best interpreted in terms of CCW rotation starting at around 17 Ma. The rotations must have affected not only the sedimentary fill of the Carpathian Foredeep but also the basement, owing to the dextral shift on NW–SE trending block‐bounding faults observed in the basement and in the Miocene sediments. This evidence for `non‐European' palaeomagnetic directions north of the Alpine–Carpathian mountain chain together with previously published indications question the rigidity of the European plate during the last 20 Ma, at least near the thrust front of the Alps and Carpathians.
Col o ni za tion by ma rine or gan isms such as foraminifers, molluscs, bryo zoans, brachi o pods and red al gae dur ing the Mid dle Mio cene (Early Badenian) trans gres sion near Pøemyslovice (Carpathian Foredeep) was ini tially af fected by a cool wa ter cur rent of un clear or i gin. How ever, shortly af ter wards, fall out of vol ca nic ma te rial caused a to tal ter mi na tion of the biota. Af ter this ca tas tro phe, the biota started recolonize the area. The suc ceed ing as so ci a tion, adopted to warm-wa ter in put, is char ac ter is tic of the cli ma tic op ti mum dur ing the Early Badenian and is com pa ra ble with those of other sec tions re ferred to this in ter val in the Carpathian Foredeep (such as Kralice nad Oslavou, Podbøežice, and Hluchov).Kamil Zágoršek, De part ment of Palae on tol ogy, Na tional Mu seum, Václavské námìstí 68,
As so ci ate Ed i tor-Anna Wysocka The en trenched Odra palaeovalley, cut into the bed rock of the dis tal mar gin (forebulge basal un con formity) of the Moravian Carpathian Foredeep (pe riph eral fore land ba sin) is filled with an al most 300 m thick pile of Mio cene de pos its. The directon of the val ley (NW-SE to NNW-SSE) has been con trolled by faults subparallel with the sys tem of sudetic faults". The sed i mentary suc ces sion con sists of 5 fa cies as so ci a tions/depositional en vi ron ments, which are in ter preted (from bot tom to top, i.e. from the old est to the youn gest) as: 1-col lu vial de pos its to de pos its of al lu vial fan, 2-de pos its of al lu vial fan, 3-fan-delta de pos its, 4-shal low wa ter delta to nearshore de pos its and 5-open ma rine de pos its. This fin ing-up and deep en ing-up succes sion re veals the fol low ing: the for ma tion of the new flex ural shape of the ba sin; deep ero sion con nected with up lift and tilting of the forebulge and re ac ti va tion of the NW-SE trending base ment faults; the Early/Mid dle Mio cene sea level fall; al lu vial de po si tion mostly driven by tec ton ics and mor phol ogy; forebulge flex ural re treat; Mid dle-Mio cene sea level rise; back-stepping of val ley infill; ma rine in va sion dur ing the Early Badenian with shift of the coast line fur ther land ward of the pallaeovalley. Tec ton ics re lated to con tem po rary thrust ing pro cesses in the West ern Carpathians are as sumed to be the dom i nat ing fac tor of the stud ied de po si tion at the ex pense of eustatic sea level changes. Prov e nance stud ies have proven that the pre-Neogene base ment (i.e. the Early Car bon if er ous clastic "Culmian fa cies" of the Moravian-Silesian Pa leo zoic) rep re sents an impor tant source for the con glom er ates and sands, which vol u met ri cally dom i nate in the palaeovalley infill. How ever, they also showed, that the de pos its of the ear lier Carpathian Foredeep Ba sin sed i men tary stage (Karpatian in age?) cov ered the area un der study and were eroded and resedimented into the palaeovalley infill.
Lower Badenian sediments were studied on the locality Hvozdíkova at the Diviš district, Brno. There were interpreted 4 lithofacies of Neogene (Lower Badenian) sediments (lithofacies M1, M2, Sl, and SGl). Occurrence of basal Lower Badenian clastics is connected with existence of coarse-grained delta (foreset). Overlying pelites document pelagic sedimentation of open sea. Garnet dominates in assemblage of heavy translucent minerals.Rich assemblages of foraminifers, molluscs, spines of echinoids, ostracods and shark fauna were discovered in sediments. Diversified assemblages are dominated by plankton specimens. Species Orbulina suturalis Brön., Praeorbulina glomerosa circularis (Blow) and Globigerinoides bisphericus Todd. indicate the Lower Badenian age.From the point of view of the shark fauna diversity the locality Hvozdíkova is unique; shark fauna is very rare in Lower Badenian clays, and the genera of Squaliolus and Paraetmopterus are identified for the first time. Oysters – especially species Neopycnodonte navicularis (Brocchi) – dominate in Lower Badenian sediments. Small gastropods (for example Cancellaria sp., ?Tornus sp., Rissoa sp., Alvania sp.) probably represent fossils reworked from shallow littoral area.
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