23 research outputs found
Magyarorszågi triåsz és jura radiolåria közösségek taxonómiai és biosztratigråfiai vizsgålata, valamint alkalmazåsa globålis paleo-oceanogråfiai modellezésben = Taxonomy and biochronology of Triassic and Jurassic radiolarians from Hungary: relations with global paleoceanographic events
FelĂĄllĂtottam egy Ășj, radiolĂĄria alapĂș kvantitatĂv biokronolĂłgiai (UAZ) zonĂĄciĂłt a balatonfelvidĂ©ki triĂĄsz radiolĂĄriĂĄk alapjĂĄn. Ennek segĂtsĂ©gĂ©vel az illyrtĆl a juli aljĂĄig terjedĆ idĆszakot 9 zĂłnĂĄra lehetett felosztani. BizonyĂthatĂł, hogy korĂĄbban a Reitzi zĂłna bĂĄzisĂĄhoz köthetĆ nagyobb mĂ©rtĂ©kƱ faunakicserĂ©lĆdĂ©s mĂĄr a Trinodosus zĂłnĂĄban vĂ©gbement. A tethysi terĂŒletek legkarakterisztikusabb faunakicserĂ©lĆdĂ©se a Curioni zĂłna bĂĄzisĂĄn ment vĂ©gbe. ElĆször tudtam biosztratigrĂĄfiai adatokkal bizonyĂtani, hogy a DarnĂł-egysĂ©gen belĂŒl a triĂĄsznak tartott bazaltok kora Ă©s a riftesedĂ©s megindulĂĄsĂĄnak a dĂĄtuma kora ladin. Emellett bizonyĂtani lehetett, hogy a jura ofiolit sorozatokhoz tartozĂł radiolaritok kora felsĆ bajĂłci - alsĂł kallovi. RadiolĂĄriĂĄk alapjĂĄn az eddigi legpontosabban lehetett kijelölni a T/J hatĂĄrt a csĆvĂĄri szelvĂ©nyben. PontosĂtani tudtam a BĂŒkki egysĂ©ghez tartozĂł MĂłnosbĂ©li-egysĂ©g radiolaritos ĂŒledĂ©kösszletĂ©nek korĂĄt, ami felsĆ bajĂłci - felsĆ kallovi. A RudabĂĄnya-hegysĂ©g Telekesvölgyi KomplexumĂĄban lĂ©vĆ melange kora bajĂłci - alsĂł bath, szemben a korĂĄbbi aaleni - alsĂł bajĂłci feltĂ©telezĂ©ssel. ElsĆkĂ©nt tudtam a Pindosz-hegysĂ©gbĆl leĂrni bazalttal összefogazĂłdĂł radiolaritokat, amelynek alsĂł ladin kora a DinĂĄri Ofiolitöv eddigi legidĆsebb korhatĂĄrozĂĄsĂĄnak bizonyult. 3 Ășj radiolĂĄria csalĂĄdot, 8 Ășj genust, 72 Ășj fajt Ă©s 14 Ășj alfajt Ărtunk le a törökorszĂĄgi Mersin Melange alsĂł tuval korĂș kĂ©pzĆdmĂ©nyeibĆl. | The well preserved and diverse Middle and Upper Triassic radiolarians provide new, quantitative biochronological zonation from Illyrian to lower Julian in Balaton Highland. The significant changes in radiolarian biodiversity were detected in the Trinodosus and Curioni Ammonite Zones. Early Ladinian and Upper Bajocian - Lower Callovian radiolarians were described from the radiolaritic matrix of various ophiolite blocks including a basalts in DarnĂł Unit, Northern Hungary. Based on radiolarians was assigned the Triassic and Jurassic boundary in the T/J section near CsĆvĂĄr, Hungary. More precise radiolarian data (upper Bajocian - lower Callovian) was described for sedimentary sequences in MĂłnosbĂ©l Unit, BĂŒkk Mountains, Hungary. Early Bajocian to lower Bathonian age was assigned for matrix of melange in the Telekesvölgy Complex, RudabĂĄnya Hills, Northern Hungary. Triassic radiolarian biostratigraphic data are reported from radiolarites of Northern Pindos and Othrys Mountains, Inner Hellenides, Northern Greece. These data confirm that processing of the Neotethyan rifting, new oceanic crust was already formed in the Anisian which was overlain by Upper Anisian to Carnian (Norian?) radiolarites. Three new radiolarian families, eight new genus, 72 new species and 14 new subspecies were described from the lower Tuvalian in the Mersin Melange, southeastern Turkey
Orogeny forced terrestrial climate variation during the late Eocene: early Oligocene in Europe
Re-evaluation of the Mesozoic complexes of DarnĂł Hill (NE Hungary) and comparisons with Neotethyan accretionary complexes of the Dinarides and Hellenides â preliminary data
Abstract
The Mesozoic complex of DarnĂł Hill area in NE Hungary, according to well core documentation,
is made up of two units. The upper unit, the DarnĂł Unit s.s., consists predominantly of blocks of
ophiolitic rocks (pillow and massive basalt, gabbro) and subordinate abyssal sediments (red
radiolarite and red pelagic mudstone of either LadinianâCarnian or BathonianâCallovian age, as well
as bluish-grey, sometimes blackish siliceous shale of the latter age). The basalt is geochemically of
MOR type, based on earlier evaluations. However, it comes in two types: reddish or greenish
amygdaloidal pillow basalts with peperitic facies containing reddish micritic limestone inclusions,
and green basalts without any sedimentary carbonate inclusion. The former type is probably MiddleTriassic,
advanced rifting stage-related basalt, whereas the latter is probably of Jurassic age,
corresponding to the SzarvaskĂ”-type basalt of the western BĂŒkk Mountains. Pre-Miocene presence of
an ultramafic sheet above the complex is indicated by serpentinite pebbles in the Lower Miocene
DarnĂł Conglomerate.
The lower unit, corresponding to the MĂłnosbĂ©l Unit of the western BĂŒkk Mountains, consists of
lower slope and toe-of-slope type sediments: dark grey shale and bluish-grey siliceous shale of
Jurassic age, both showing distal turbiditic character, with frequently interbedded carbonate
turbidites and debris flow deposits containing cm- to dm-sized limestone and micaceous sandstone
clasts. One to ten m-sized slide blocks of reddish, siliceous Triassic BĂłdvalenke-type limestone
associated with the above-mentioned reddish, amygdaloidal basalt also occur. In one of the studied
cores a block comprising evaporitic siliciclastics akin to those of the Middle Permian Szentlélek
Formation and black, fossiliferous limestone similar to the Upper Permian NagyvisnyĂł Limestone
Formation of the BĂŒkk Mountains, was also encountered.
A preliminary comparison with similar Triassic advanced rifting-type basalt and limestone/
radiolarite of the western ophiolite zone of the Balkan Peninsula is presented (Fig. 1): the Zagorje
region of NW Croatia, the Zlatibor-Zlatar Mountains of SW Serbia, and the North Pindos and Othrys
Mountains, as well as Euboea Island, of Northern Greece. We propose the terms "Loggitsi Basalt" for
such Triassic basalt containing peperitic facies, after the village of Loggitsion located in the central part
of the Othrys Mts, and "BĂłdvalenke Limestone" for the transitional facies between Hallstatt
Limestone and Triassic red radiolarite, after the village of BĂłdvalenke located in the RudabĂĄnya Hills.
The northwesternmost occurrence of both of these typical Neotethyan formations can be found in NE
Hungary (DarnĂł Hill and BĂłdva Unit of RudabĂĄnya Hills, respectively)
TriĂĄsz Ă©s jura lejtĆfĂĄciesek jelentĆsĂ©ge a Neotethys ĂNy-i vĂ©gĂ©nek geodinamikai Ă©rtelmezĂ©sĂ©ben = Importance of Triassic and Jurassic slope facies in the geodynamic reconstruction of the NW termination of the Neotethys
A program cĂ©lja az Ă©szak-magyarorszĂĄgi triĂĄsz Ă©s jura medence- Ă©s lejtĆfĂĄciesek szedimentolĂłgiai Ă©s rĂ©tegtani vizsgĂĄlata volt Ășj fejlĆdĂ©störtĂ©neti szintĂ©zis kidolgozĂĄsa Ă©rdekĂ©ben, Ă©s azĂ©rt, hogy lehetĆvĂ© vĂĄljon a korrelĂĄciĂł a DinaridĂĄk Ă©s a HellenidĂĄk hasonlĂł korĂș Ă©s kifejlĆdĂ©sƱ kĂ©pzĆdmĂ©nyeivel. A kutatĂĄsokat a BĂŒkkben, a darnĂłi terĂŒleten, a MĂĄtrĂĄban mĂ©lyĂtett fĂșrĂĄsok anyagĂĄn Ă©s a RudabĂĄnyai-hegysĂ©gben vĂ©geztĂŒk. Az összehasonlĂtĂł elemzĂ©s Ă©rdekĂ©ben terepi megfigyelĂ©seket Ă©s vizsgĂĄlatokat vĂ©geztĂŒnk a DinaridĂĄkban, a HellenidĂĄkban, a Keleti- Alpokban Ă©s a Nyugati-KĂĄrpĂĄtokban. A Neotethys akkrĂ©ciĂłs komplexumĂĄnak rĂ©szĂ©t kĂ©pezĆ bĂŒkki, tovĂĄbbĂĄ a MĂĄtra aljzatĂĄt alkotĂł Ă©s a DarnĂł környĂ©ki kĂ©pzĆdmĂ©nyek alapvetĆ jellegei jĂłl megfeleltethetĆk a DinaridĂĄkban ismertekkel, Ă©s ennĂ©l fogva kĂ©pzĆdĂ©si körĂŒlmĂ©nyeik is levezethetĆek a DinaridĂĄkra a közelmĂșltban kidolgozott modellekbĆl. A RudabĂĄnyai-hegysĂ©gben megismert olisztosztrĂłmĂĄk törmelĂ©kanyaga mutat ugyan összetĂ©telbeli eltĂ©rĂ©seket a bĂŒkkiekhez Ă©s a mĂĄtraiakhoz kĂ©pest, de fontos összekapcsolĂł bĂ©lyegeket is felismertĂŒnk. Az Ăszaki MĂ©szkĆalpokban megfigyelt szubdukciĂłhoz köthetĆ jelensĂ©gek szedimentolĂłgiai jellege Ă©s idĆbeli lefolyĂĄsa jĂł korrelĂĄciĂłt mutat a BĂŒkkben megismerthez, de a medencĂ©kben felhalmozĂłdott törmelĂ©kben lĂ©nyeges eltĂ©rĂ©sek vannak. Ez az akkrĂ©ciĂłs komplexum törmelĂ©kanyagĂĄnak zömĂ©t szolgĂĄltatĂł felsĆ, kontinentĂĄlis lemez felĂ©pĂtĂ©sĂ©nek kĂŒlönbsĂ©gĂ©re vezethetĆ vissza. Az eredmĂ©nyek alĂĄtĂĄmasztjĂĄk a bĂŒkki, a mĂĄtrai-darnĂłi Ă©s a rudabĂĄnyai mezozoos összleteknek a DinaridĂĄkhoz kapcsolĂłdĂł eredeti helyzetĂ©t. | Study of sedimentological and stratigraphical characteristics of the Triassic and Jurassic basin and slope facies in North Hungary was the aim of the project. Elaboration of a new geodynamic synthesis and correlation with the coeval and genetically similar formations of the Dinarides and Hellenides were also in the focus of the project. The studies were performed in the BĂŒkk Mts., in the DarnĂł area, on cores drilled in the MĂĄtra Mts., and in the RudabĂĄnya Hills. For comparative analyses field studies were carried out in the Dinarides, Hellenides, in the Eastern Alps and Western Carpathians. Basic characteristics of the relics of the Neotethys accretionary complexes occur in the BĂŒkk, in the basement of the MĂĄtra and also in the DarnĂł area show good correspondence with those in the Dinarides and therefore their genetic conditions can be derived from the recently elaborated genetic models for the Dinarides. Although differences were pointed out in the composition of olistostromes encountered in the RudabĂĄnya Hills, and that in the BĂŒkk and MĂĄtra Mts., significant common features were also recognised. Sedimentological characteristics and timing of the subduction-related phenomena observed in the Northern Calcareous Alps can also be correlated with those in the BĂŒkk, but there are substantial differences in the composition of the clasts. This can be explained by the differences in the upper continental plate, source of dominant part of the clasts of the accretionary complex. The results support the concept on the Dinaridic relationship of the Mesozoic complexes of the BĂŒkk, MĂĄtra-DarnĂł and RudabĂĄnya Hills
A VĂ©rtes Ă©s elĆtereinek szerkezetfejlĆdĂ©se Ă©s annak kapcsolata a kainozoos ĂŒledĂ©kkĂ©pzĆdĂ©ssel Ă©s Ćsföldrajzzal = Structural evolution if the VĂ©rtes Hills including their forelands and the relationship with Cenozoic sedimentation and paleogeography
A VĂ©rtes kainozos szerkezetfejlĆdĂ©sĂ©ben 6 fĂĄzis elemeit Ă©s azoknak az ĂŒledĂ©kkĂ©pzĆdĂ©shez Ă©s felszĂnfejlĆdĂ©shez valĂł kapcsolatĂĄt vizsgĂĄltuk. Az eocĂ©n ĂŒledĂ©kkĂ©pzĆdĂ©s (Ny)ĂNy-(K)DK-i összenyomĂĄs Ă©s merĆleges hĂșzĂĄs hatĂĄsĂĄra ment vĂ©gbe. Az enyhe gyƱrĆdĂ©s következtĂ©ben ĂK-DNy-i csapĂĄsĂș hĂĄtak Ă©s medencĂ©k jöttek lĂ©tre. ElĆbbieken karbonĂĄtos, utĂłbbiakban pelites rĂ©tegsorok rakĂłdtak le. A karbonĂĄtos ĂŒledĂ©kkĂ©pzĆdĂ©s vĂĄltozĂł jellegƱ rĂĄmpĂĄkon ment vĂ©gbe, melyek tĂŒkrözik a kismĂ©rtĂ©kƱ deformĂĄciĂłt, a karbonĂĄtproduktivitĂĄst Ă©s a globĂĄlis vĂzszintesĂ©st. Az oligocĂ©nben a MĂłri-peremvetĆ mƱködött, ami nagy vastagsĂĄgĂș összlet lerakĂłdĂĄsĂĄt tette lehetĆvĂ©. A vĂ©rtesi törmelĂ©kes sorozat kĂ©pzĆdĂ©se a kiscelli vĂ©gĂ©n kezdĆdhetett. A kora-miocĂ©nben mƱködĆ K-Ny-i jobbos Ă©s ĂNy-DK-i balos eltolĂłdĂĄsokat ismertĂŒnk fel. A kora-, közĂ©psĆ-miocĂ©n szin-rift fĂĄzis normĂĄlvetĆihez a szarmatĂĄtĂłl tĂĄrsult szintektonikus ĂŒledĂ©kkĂ©pzĆdĂ©s. Az Ășgynevezett poszt-rift fĂĄzisban szĂĄmos normĂĄlvetĆ Ă©s eltolĂłdĂĄs jött lĂ©tre ill. reaktivĂĄlĂłdott, melyek meghatĂĄroztĂĄk a kĂ©sĆ-pannon ĂĄrkokat, transztenziĂłs medencĂ©ket. A pliocĂ©ntĆl kitakarĂłdĂł VĂ©rtesrĆl hegylĂĄbfelszĂnek mentĂ©n pusztult le a miocĂ©n Ă©s paleogĂ©n fedĆĂŒledĂ©k. A negyedidĆszaki vetĆk mozgĂĄsa kibillentette a hegylĂĄbfelszĂneket Ă©s mĂłdosĂtotta a vĂzrajzot, deformĂĄlta a kvarter ĂŒledĂ©keket. A felszĂnalakulĂĄst erĆs szĂ©lerĂłziĂł kĂsĂ©rte. | We investigated 6 Cenozoic deformation phase and their relationship to sedimentation, basin formation and landscape evolution. The Eocene sedimentation was controlled by (W)NW-SE compression and perpendicular tension. The gentle folding resulted in the formation of NE-trending ridges and basins. Shallow marine carbonate sedimentation occurred on ridges, while deeper basins were marked by pelitic successions. Carbonate sedimentation occurred on ramps with varying style, reflecting the gentle deformation, carbonate productivity and global eustatic sea level changes. The Oligocene activity of the MĂłr Fault permitted the deposition of a thick clastic succession, which started to form in the late Kiscellian. We recognized E-W striking dextral and NW-SE striking sinistral strike-slip faults of early Miocene age. The late Early to Middle Miocene syn-rift phase was associated with sedimentation only from the Sarmatian. The post-rift phase is marked by numerous normal and strike-slip faults, which controlled the evolution of late Miocene syn-sedimentary grabens and transtensional basins. The Miocene and Palaeogene sedimentary cover of the VĂ©rtes was eroded along pediment surfaces from the Pliocene onset of exhumation. The Quaternary slip of reactivated faults resulted in tilting of the pediment surfaces, sediment deformation and deflection of the drainage pattern. Landscape evolution was strongly influenced by wind erosion
Az ĂK-magyarorszĂĄgi paleozoikum Ă©s mezozoikum dinĂĄri-hellenid korrelĂĄciĂłja = Dinaridic-Hellenidic correlation of the Paleozoic and Mesozoic of NE Hungary
ElkĂ©szĂŒltek A Cirkum-Pannon rĂ©giĂł tektonosztratigrĂĄfiai tĂ©rkĂ©peinek magyarĂĄzĂł fejezetei, amelyek a XVIII. KĂĄrpĂĄt-BalkĂĄn GeolĂłgiai Kongresszuson (BelgrĂĄd, 2006) lettek bemutatva. ElkĂ©szĂŒlt a DarnĂłi komplexum Ă©s a Recsk-mĂ©lyszint ĂșjraĂ©rtĂ©kelĂ©se Ă©s tĂ©rkĂ©pe, valamint elĆzetes korrelĂĄciĂł a BelsĆ-DinaridĂĄk Ă©s BelsĆ-HellenidĂĄk irĂĄnyĂĄban, szerb Ă©s görög egyĂŒttmƱködĂ©sben; utĂłbbiban Ășj tektonikai modellek vetĆdtek fel a BĂŒkk-hegysĂ©gben. JelentĆsen elĆre haladt a RudabĂĄnyai-hegysĂ©g közĂ©psĆ rĂ©szĂ©nek szerkezeti Ă©s jĂșra megismerĂ©se, elkĂ©szĂŒlt a nem metamorf aggtelek-rudabĂĄnyai egysĂ©gek szerkezeti kersztszelvĂ©nye az orszĂĄghatĂĄrtĂłl SzalonnĂĄig. | Explanatory chapters of the Circum-Pannonian tectonostratigraphic terrane map series have been prepared for printing; they were presented at the XVIIIth Carpato-Balkan Geological Congress (Belgrade, 2006). The DarnĂł Complex and the pre-Tertiary basement of the Recsk Paleogene ore-field have been revised, the new geological map of the DarnĂł area have been prepared. Preliminary correlation with the Inner Hellenides - Inner Dinarides has been made and in Greek cooperation a partly new tectonic model was elaborated for the BĂŒkk Mts. Knowledge on the structure and Jurassic stratigraphy oh the middle part of the RudabĂĄnya Mts. has been significantly increased. Structural cross-section of the non-metamorphosed units of Aggtelek-RudabĂĄnya Mts. (from the state border to the SE margin) has been prepared for printing
Stratigraphy, facies and geodynamic settings of Jurassic formations in the BĂŒkk Mountains, North Hungary: its relations with the other areas of the Neotethyan realm.
Jurassic mélange complexes related to the subduction of the Neotethys Ocean occur
in the BĂŒkk Mountains, North Hungary. This paper characterizes the sedimentary sequence of
basin and slope facies that occur in the southwestern part of the BĂŒkk Mountains, placing special
emphasis on the redeposited sedimentary rocks (olistostromes, olistoliths: Mónosbél Group) in order
to obtain information on the provenance of the clasts, and the mode and time of their redeposition.
The series of formations studied shows a general coarsening-upwards trend. Based on radiolarians
and foraminifera, the Mónosbél Group formed in Early to Late Bathonian time. The lower part
of the complex is typified by a predominance of pelagic carbonates, shale and radiolarite with
andesitic volcaniclastic intercalations. The higher part of the succession is characterized by polymictic
olistostromes. Large olistoliths that are predominantly blocks of Bathonian shallow marine limestone
(BĂŒkkzsĂ©rc Limestone) appear in the upper part of the sequence. Based on the biostratigraphic and
sedimentological data, results of analyses of the redeposited clasts and taking into consideration
the concepts of the development of the western Neotethys domain, the evolutionary stages of the
sedimentary basins were defined. The onset of the compressional stage led to initiation of nappe
stacking that led to the formation of polymict olistostromes and then to the redeposition of large
blocks derived from out-of-sequence nappes of the former platform foreland
A Magyarorszågi Paleogén Medence paleo-oceanogråfiåja bentosz foraminiferåk paleoökológiai vizsgålata alapjån = Palaeocanographic history of the Hungarian Palaeogene Basin using a palaeoecological analyis of benthic foraminifera
16 late Palaeogene (LutetianâRupelian) boreholes and sections from the Hungarian Palaeogene Basin were
investigated for their benthic foraminiferal faunas in order to reconstruct its palaeoecological and palaeoceanographic
evolution. In the mentioned ecological interpretation of the temporal distribution of foraminiferal assemblages,
multivariate statistical methods were used. These methods included Q-mode principal factor analysis (PFA) and BFOI
(Benthic Foraminiferal Oxygen Index) analysis. On the basis of the Q-mode principal factor analysis, the faunas are
characteristic for inner neritic (0â30 m water depth) to upper bathyal environments (approximately 30â500 m water
depth). The composition of the benthic foraminiferal fauna and the results of the Q-mode principal factor analysis
indicate tropicalâwarm conditions from the beginning of the Middle Eocene. A change in the temperature of the bottom
water can be detected from the late Middle Eocene time, and estimated temperatures indicate temperateâcold conditions
during this period. On the basis of the BFOI (Benthic Foraminiferal Oxygen Index) analysis, the Middle and Late Eocene
are characterised by two short eutrophic events (POMZ1 and POMZ3) and two significant eutrophic (POMZ2 and
POMZ
4) events. These periods are characterised by evidence of a low diversity of fauna, with a high dominance of lowoxygen tolerant (infaunal) species. The eutrophic events suggest that there was a second-order sea-level fall and restricted
deep water circulation, while the oligotrophic and high oxic conditions might have been caused by colder, welloxygenated bottom water masses from the SE Tethyan Realm. Evidence suggests that these oligo- to mesotrophic periods
were characterised by a high diversity of fauna, with a signifcant dominance of epifaunal species. The initial stage of the
significant subsidence history coincides with the POMZ2 period at the end of the NP17 zone. This demonstrates clearly
that the evolution of the Hungarian Palaeogene Basin was strongly influenced by significant palaeoceanographic events
Late Devonian (FrasnianâFamennian) palynomorphs from the Padeha and Bahram Formations of Shahzadeh Mohammad section, northwest of Kerman, Iran
A diverse and well-preserved microphytoplankton assemblage is reported from a measured section
of FrasnianâFamennian (Upper Devonian) Padeha and Bahram Formations in Shahzadeh Mohammad
area, northwestern Kerman, southeast Iran. The palynoflora assemblage contains 17 genera and 23 species of
acritarchs, chitinozoa, scolecodont and rich miospore taxa. 57 species (25 genera) of miospores were identified
and 5 assemblage biozones were defined from the Shahzadeh Mohammad section. The miospore composition
is similar to neighboring localities in Southern and Northern Iran, but it shows significant similarities with
palynoflora from more distant localities, e.g. Saudi Arabia, Western Australia or Algeria. This implies a close
relationship between the Iranian platform and other areas of the Northern Gondwana and southern Laurentia
Domain during the late Devonian. The investigated section was deposited in a shallow marine environment with
tropical conditions during the Frasnian-Famennian period