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The Steinplatte complex (Late Triassic, Northern Calcareous Alps, Austria) - subsidence-controlled development of a carbonate-platform-to-intrashelfbasin-transition

Kaufmann B.

Acta Geologica Polonica

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2009

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Vol. 59, no. 3

341-357

EN

In Rhaetian (Late Triassic) times, the Hauptdolomit/Dachstein carbonate shelf situated at the passive continental margin of the northwestern Tethys was characterized by an extensional tectonic regime. Rifting and spreading movements fragmented this shelf into a loosely fitted mosaic of fault-bounded blocks characterized by a differential subsidence pattern. This is expressed in significant thickness variations of platform carbonates and in the formation of the intrashelf Kossen Basin. In this study, it can be demonstrated that tectonic subsidence triggered the development of a carbonate platform margin and that the influence of eustatic sea-level changes was negligible. The Steinplatte complex developed at the transition of the Kossen Basin to the Dachstein Carbonate Platform. Small-scale isolated carbonate mounds situated on a smoothly inclined homoclinal ramp characterized the initial phase and acted as nuclei of further carbonate buildup growth. However, only the ideal palaeogeographic position far enough away from the carbonate-suppressive terrigenous influence of the Kossen Beds, combined with vigorous carbonate production stimulated by rapid subsidence-caused sea-level rise, favoured continuous mound growth. Once established, the carbonate buildup was characterized by rapid aggradational growth, developing a palaeogeographic high with a steep slope and a depression with decreased sedimentation behind, several kilometres distant from the Dachstein Carbonate Platform. Contemporaneously, isostatic adjustment caused an accommodation minimum on the nearby margin of the Dachstein Carbonate Platform leading to its westward progradation. Fading out of subsidence caused filling of the former depression in the back of the buildup by prograding shallow-water Dachstein Limestones. Thus, a new platform margin was established in the Steinplatte area, elevated almost 200 m above the adjacent Kossen Basin. At the Triassic-Jurassic boundary, the Steinplatte complex was subjected to subaerial exposure by a sudden tectonic uplift followed by a rapid isostatic drop. Emergence is indicated by levels of karstified limestones directly underlying supposed exposure surfaces. Final drowning of the Steinplatte complex as well as of the whole Dachstein Carbonate Platform is indicated by the cover of Early Jurassic (Sinemurian) deeper water, ammonitebearing limestones (Adnet Formation).

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Środkowotriasowa ichnofauna kręgowców z "warstw z Krynek" w Górach Świętokrzyskich : wstępny przegląd

Niedźwiedzki G., Kin A., Remin Z., Małkiewicz M.

Przegląd Geologiczny

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2007

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Vol. 55, nr 10

870-879

EN

Numerous specimens of vertebrate tracks were discovered in the uppermost Röt (uppermost Buntsandstein) deposits of "Krynki Beds" that crop out at Witulin, Parszów, Małe Jodło, Jarugi, Bliżyn, and Sorbin in the north-eastern and central margin of the Holy Cross Mountains, Poland. The following vertebrate ichnotaxa were identified in these localities: Chirotherium barthii Kaup, 1835; Chirotherium cf. sickleri; Synaptichnium cf. diabloense; Isochirotherium herculis (Egerton, 1839); ? Isochirotherium cf. herculis; Isochirotherium isp.; Chirotheriidae indet.; Rhynchosauroides isp., and Rhynchosauroidae indet. The ichnoassemblage from the "Krynki Beds" is very similar to ichnoassociations which are known from: 1) latest Early and early Middle Triassic (Upper Buntsandstein) deposits of the Central European Basin, 2) latest Early and early Middle Triassic Moenkopi Formation of USA, 3) Middle Triassic deposits of United Kingdom, France and Italy.

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A new record of Beneckeia tenuis (Seebach, 1857) from the Rhaetian of Piekoszów (Holy Cross Mountains)

Salamon M.A., Nizicki R.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2004

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T. 30, z. 4

439-444

EN

The ammonoid Beneckeia tenuis (Seebach) is recorded from the Rhaetian (Lower Anisian) of the Holy Cross Mountains. Three specimens were collected from a single rock layer that is typical of epicontinental sea deposition of the time.

PL

Opisano amonity Beneckeia tenuis (Seebach) z retu (dolny anizyk) Gór Świętokrzyskich. Charakteryzowana fauna obejmuje trzy okazy typowo epikontynentalnej formy Beneckeia tenuis, które pochodzą z jednej warstwy skalnej.

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Stratygrafia retu i wapienia muszlowego z południowo-zachodniej Polski

Senkowiczowa H.

Biuletyn Państwowego Instytutu Geologicznego

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2000

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nr 390

97-166

PL

W opracowaniu przedstawiono wykształcenie, rozprzestrzenienie i podział stratygraficzny retu i wapienia muszlowego w południowo-zachodniej części Polski. Materiału do rozważań dostarczyły dane z 43 otworów wiertniczych opracowane przez autorkę i liczne opracowania otworów wiertniczych znane z literatury. Na podstawie cech litologicznych i zespołów fauny oraz flory dokonano szczegółowego podziału osadów.

EN

The study shows lithology, occurrence and stratigraphical subdivision of Roethian and Muschelkalk deposits in the southwestern part of Poland. The material was derived from 43 boreholes analysed by the author, and a number of boreholes described in literature. A detailed subdivision of the deposits have been possible on the basis of lithological features and faunal and floral assemblages.