Triász platform- és medencefáciesek kapcsolata a Pilis vonulatban = Relationship between Triassic platform and basin facies of the Pilis Range

A Pilis Dachsteini Meszkő kifejlődeset peritidalis es sekely szubtidalis retegtagokbol felepulő, ciklusos retegsor jellemzi, amely a biosztratigrafiai vizsgalatok szerint a nori emeletbe tartozik. A Dachsteini-platform peremehez kozeli lejtőfaciest lito- es bioklasztokbol, valamint bekergezett szemcsekből allo durvaszemcses uledek alkotja, amely alatt a platformlagunara es a medencere jellemző kagylok viharok altal atulepitett kokvinai egyutt fordulnak elő. A Dachsteini Meszkővel reszben heteropikus Feketehegyi Meszkő retegsorat disztalis tempesztit- es medencefaciesű retegek valtakozasa epiti fel. A Feketehegyi Meszkőben talalhato atulepitett zoldalga-toredekek nori koru florat jeleznek az egyidős Dachsteini platformon. A Pilis Dachsteini Meszkő retegsora a Tethys selfjen kialakult sekelytengeri platform hatterlagunajaban kepződott a nori soran. A nori kozepen aktivizalodott extenzios tektonika hatasara jott letre a platformon belul a felarok-jellegű Feketehegyi-medence, amelynek lankas oldalan egyenlejtes rampa jott letre, sekelytengeri kagylo-koloniakkal es viharuledekekkel. A kiemelt helyzetben maradt blokkok peremet foltzatonyokkal tarkitott ooid-homokdombok alkottak, bekergező szervezetekkel. A medence melyebb regiojaban ugyanakkor disztalis turbiditek es medenceuledekek rakodtak le. A keső-nori legnagyobb elontes idejen a Feketehegyi-medence nyitottabba valt, majd az ezt kovető magas vizallas idejen a platformlejtő előrenyomult a medence iranyaba a nori–rhaeti hataran. | The Pilis Hills are made up predominantly of the Dachstein Limestone of Norian age. It is characterised by alternation of peritidal and shallow subtidal Lofer cycles. However, coeval basin facies with distal tempestite interlayers (Feketehegy Limestone) also occur in the Pilis. Redeposited fragments of Norian green-algae constrain the synchrony of the platform and basin facies. Proximal tempestite beds with mollusc coquina indicate the upper part of low-angle slopes between the basin and the platform. In the northern part of the Pilis, the mollusc coquina beds are overlain by thick limestone of forereef slope facies. The Dachstein Limestone of the Pilis was formed in the internal platform domain of the Dachstein platform system which developed along the margin of the Neotethys during the Late Triassic. As a result of extensional tectonic movements activated in the mid-Norian the half-graben type Feketehegy Basin came into existence. On the low-angle side of this basin a homoclynal ramp was developed where bivalve coquinas and proximal storm deposites were accumulated. Oolitic mounds with patch reefs were developed along the margin of the elevated blocks. Basinal carbonates and distal tempestites were deposited in the deepest part of the basin. At the time of the Late Norian maximum flooding the Feketehegy Basin became more open; it was probably followed by progradation of the ambient platform during the subsequent latest Norian – earliest Rhaetian highstand period.