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Solution-collapse breccias in the upper Olenekian–Ladinian succession, Tatra Mts, Poland

Jaglarz P., Rychliński T.

Annales Societatis Geologorum Poloniae

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2018

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Vol. 88, No. 4

303--319

EN

The upper Olenekian-Middle Triassic succession of the Tatricum domain (Central Western Carpathians, southern Poland) includes a few horizons of breccias, which are intercalated with early-diagenetic dolostones. On the basis of macroscopic and microscopic (including cathodoluminescence) observations, the paper presents a new interpretation of the genesis of the breccias and their diagenetic history. The rocks studied range from monomictic, cemented mosaic packbreccias to chaotic, unsorted, monomictic, particulate rubble floatbreccias. The processes that preceded the formation of the breccias encompassed the precipitation of evaporites and the early-diagenetic dolomitization of lime muds. The solution-collapse breccias were formed during episodes of cyclic sediment emersions in the upper Olenekian and Middle Triassic, as the result of gradual sediment collapse after karstic dissolution of the intercalated evaporites. After the brecciation process, during diagenesis the rocks were subjected to cementation by sulphate minerals and next, to multi-stage dolomitization. Later tectonic processes led to fracturing and even re-brecciation of the previously formed solution-collapse breccias.

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Uwagi do nomenklatury skał węglanowych triasu tatrzańskiego

Jaglarz P., Rychliński T.

Przegląd Geologiczny

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2010

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Vol. 58, nr 4

327-334

EN

The Upper Olenekian and Middle Triassic shallow water carbonates from Tatra Mts. were hitherto described using old, descriptive nomenclature only. Moreover, some sedimentological features were also misinterpreted, for example, fenestral structures were described mostly as organic ones. Authors carried out genetic reinterpretation of these sediments and selected sedimentological structures, which allow to apply modern terminology for the mentioned carbonate rocks. Generally, dolomites with fenestral structures are interpreted as early diagenetic sabkha dolomites with pseudomorphs after sulfates (gipsum, anhydrite). Fenestral structures in dedolomites are also interpreted as evaporite pseudomorphs while those developed in mudstones are interpreted as pseudomorphs after celestite. Dolosparites, earlier described as "sugar dolomites", are actually dolomitized calcarenites (grainstones and packstones).

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Skamieniałości śladowe wczesnego i środkowego triasu domeny Fatricum w Tatrach i ich znaczenie paleośrodowiskowe

Rychliński T., Uchman A.

Przegląd Geologiczny

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2010

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Vol. 58, nr 11

1079-1086

EN

Trace fossils of the Olenekian clastic deposits (Fatricum domain) in the Tatra Mts. include Rhizocorallium isp., Palaeophycus striatus, cf. Palaeophycus isp. and cf. Chondrites isp., while Planolites isp., Thalassinoides isp., Rhizocorallium isp. and Balanoglossites isp. occur in the Anisian carbonates. The Anisian trace fossil assemblage is less diverse and abundant than in the coeval carbonates of the Tatricum domain. Both, the Olenekian and Anisian trace fossils represent the impoverished Cruziana ichnofacies influenced by the increased salinity. Bioturbational structures are much less abundant than in the Anisian of the Tatricum. They are partly obliterated by diagenetic processes.

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Facies development and sedimentary environments of the Carpathian Keuper deposits from the Tatra Mountains, Poland and Slovakia

Rychliński T.

Annales Societatis Geologorum Poloniae

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2008

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Vol. 78, No 1

1-18

EN

The lower-middle Upper Triassic succession of the Fatricum domain from the Tatra Mts is commonly called the Carpathian Keuper. During Late Triassic, the Fatricum Basin was a proximal part of the central Inner Carpathian Basin. In early Carnian times, carbonate sedimentation stopped. Emersion of the Middle Triassic carbonate platform resulted in development of palaeokarst and pedogenic fabrics and deposition of conglomerates. Typical Carpathian Keuper sediments – variegated shales with intercalations of sandstones and dolomites represent mixed continental/shallow marine environments. Variegated mudstones with pedogenic carbonate concretions and intercalations of thin sandstone beds originated in mudflat environment under the semi-arid climate condition. Thick-bedded, cross-stratified sandstones with common plant debris represent fluvial deposits. They were deposited during the periods of climate pluvialisation. According to ?13C and ?18O data, thick, continuous dolomitic sediments containing local cherts represent marine sediments of perilittoral environments, which were commonly emerged as evidenced by common palaeokarst and palaeosols featuring these complexes. Cyclicity in the lower part of the Carpathian Keuper resulted from climatic changes, whereas dolomite-clastic cycles from the upper part of the succession were generated probably by sea level fluctuations. Moreover, deposition of the Keuper succession was controlled by synsedimentary tectonic which resulted in big facies variability.

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Facies and sedimentary environments of the Upper Scythian-Carnian succession from the Belanské Tatry Mts., Slovakia

Rychliński T., Szulc J.

Annales Societatis Geologorum Poloniae

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2005

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Vol. 75, No 2

155-169

EN

The Triassic Fatricum basin studied in the Belanské Tatry Mts. (Slovakia) was a relatively stable and restricted platform area influenced by eustatic and climatic fluctuations. During the early Triassic the platform was influenced by continental clastic sedimentation intermittent with shallow marine transgressions when carbonate sediments formed. Common occurrence of carbonized plat debris suggests relatively humid climatic conditions dominating during this interval (Werfenian facies). Significant climate aridisation was concurrent with the beginning of the Middle Triassic transgression as indicated by evaporitic fabrics common within the entire Middle Triassic carbonate succession. The Middle Triassic has been divided into several lithofacies complexes reflecting the interplays between the eustatic and climatic fluctuations. The lower Middle Triassic complex (lower-middle Anisian?) displays dominance of calcareous sediments indicating free communication with the open ocean. The subsequent intervals are rather uniform facies assemblage composed by dolomites and evaporites formed in a restricted and stagnant basin. The basin has been strongly influenced by subtropical storms, particularly common in the late Anisian. Transgression pulse in the early Ladinian involved growth of microbial colonies building thrombolitic biostromes. Final shallowing by the end of Ladinian led to replacement of carbonate sediments by continental clastics of the Carpathian Keuper. These sediments, mostly of alluvial nature, comprise plant debris what suggests climate pluvialisation in Carnian times.