No abstract
Vse pravice pridržane. Noben del te izdaje ne sme biti reproduciran, shranjen ali prepisan v kateri koli obliki oz. na kateri koli način, bodisi elektronsko, mehansko, s fotokopiranjem, snemanjem ali kako drugače, brez predhodnega pisnega dovoljenja lastnikov avtorskih pravic (copyrighta) CIP -Kataložni zapis o publikacijiNarodna in univerzitetna knjižnica, Ljubljana 55(038)=163.6 GEOLOŠKI terminološki slovar / uredil Jernej Pavšič ; [avtorji slovarskih člankov Mario Pleničar ... [et al.] ; seznam mineralov Dragica Strmole, preglednica geoloških dob Jernej Pavšič in Marijan Grm].
The Krim Mountain and its surroundings are characterized by Upper Triassic to Middle Jurassic rocks, which were deposited on the northern margin of the Dinaric Carbonate Platform. Upper Triassic beds are represented by Main dolomite that exhibits supra-to subtidal Lofer facies. The uppermost Triassic is characterized by approximately 40 m thick horizon of dolomitic breccia. Upper Triassic beds pass gradually into Lower Liassic dolomitic breccia, coarse-grained dolomite and micritic limestone. Presence of dolomitic breccias and absence of supra-intertidal sedimentary structures indicate sea-level rise. Middle Liassic beds consist of oolitic-oncolitic and lithiotid limestones deposited in alternating restricted lagoonal and open shallow-water environment. Upper Liassic beds are characterized by oolitic-oncolitic limestones, bituminous dolomitized limestones and dolomitic breccia deposited in high-energy shallow-water environment. Middle Jurassic beds consist of oolitic, oolitic-oncolitic and micritic limestones, formed predominantly in high-energy subtidal environment. Izvle~ek Ozemlje Krima in okolice gradijo zgornjetriasne, spodnje in srednjejurske kamnine, ki so nastale na severnem robu Dinarske karbonatne platforme. Zgornjetriasne plasti predstavlja glavni dolomit v loferskem razvoju. V njegovem zgornjem delu se pojavlja tudi okrog 40 m debel horizont dolomitne bre~e. Zgornjetriasne plasti prehajajo v spodnjeliasno dolomitno bre~o, zrnati dolomit in mikritni apnenec. Dolomitna bre~a in odsotnost nadplimskih in medplimskih sedimentnih tekstur nakazujeta poglabljanje morja. Spodnjeliasnim plastem sledi menjavanje srednjeliasnih ooidno-onkoidnih in litiotidnih apnencev, ki so nastali v zaprtem, lagunskem do ob~asno odprtem plitvovodnem okolju. Zgornjeliasne plasti sestavljajo ooidno-onkoidni apnenec, bituminozni dolomitizirani apnenec in dolomitna bre~a, ki so bili odloženi v vi{jeenergijskem plitvovodnem okolju. Srednjejurske plasti so zastopane z ooidnimi, ooidno-onkoidnimi in mikritnimi apnenci, ki so nastali pretežno v visokoenergijskem podplimskem okolju.
The Tolmin basin is a typical example of a deep-water Mesozoic basin that developed on the rifted south Tethyan continental margin. Remnants of this basin are preserved at the intersection of the Dinarides and the southern Alps in northwestern Slovenia. The Jurassic successions consist of carbonate gravity-flow deposits, radiolarian cherts and shales, and are overlain by pelagic Biancone limestone. A distinctive chert-dominated interval (the upper member of the Tolmin Formation) was dated with radiolarians. The base of this interval was assigned to the late Bajocian in the distal part of the basin and to the middle Callovian-early Oxfordian in the more proximal part of the basin. The topmost radiolarian cherts are early Tithonian in age. The mid-Tithonian transition from chert to the Biancone limestone was also determined with nannoplankton. The beginning of highly siliceous sedimentation in the Bajocian correlates well over the entire western Tethys and was linked to two factors: an increase in water depth due to regional subsidence and an increase in plankton productivity. The pronounced silica enrichment coincided with the opening of the Alpine Tethys and with the intraoceanic subduction that occurred in the Meliata-Maliac-Vardar Ocean. Reorganization of the plate boundaries may have induced substantial changes in the circulation of water masses that, in turn, had a long-term effect on surface productivity. On the basin scale, radiolarian dating revealed considerable lateral and vertical variations in the thickness of chert successions. This distributional pattern implies that, in narrow continental-margin basins, sedimentation rates were primarily determined by the redeposition of pelagic sediments. Important stratigraphic gaps occur even in the distal basinal setting. L'âge bajocien à tithonien des cherts à radiolaires dans le bassin de Tolmin (nord-ouest de la Slovénie)Mots-clés. -Bassin de Tolmin, Alpes du Sud, Dinarides, Jurassique, Chert, Radiolaires, Nannoplancton.Résumé. -Le bassin de Tolmin est un exemple typique de bassin mesozoïque relativement profond qui s'est formé pendant le rifting de la marge continentale sud-téthysienne. Les dépôts sédimentaires de ce bassin sont préservés à l'intersection entre les Dinarides et les Alpes du Sud en Slovénie nord-occidentale. Les séries jurassiques sont composées de carbonates resédimentés, de cherts à radiolaires et d'argiles et elle sont surmontées par le calcaire pélagique de Biancone. Un intervalle distinct, dominé par les cherts (le membre supérieur de la formation de Tolmin), a été daté avec des radiolaires. La base de cet intervalle a été attribuée au Bajocien supérieur dans la partie distale du bassin et au Callovien moyen-Oxfordien inférieur dans la partie plus proximale du bassin. Le sommet des cherts à radiolaires est d'âge tithonien inférieur. La transition des cherts au calcaire de Biancone au Tithonien moyen a été également datée grâce au nannoplancton. Le début de la sédimentation fortement siliceuse au Bajocien était à peu près synchrone dans l...
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