Middle Jurassic stromatactis mud-mound in the Pieniny Klippen Belt (Western Carpathians)

Aubrecht, Roman; Szulc, Joachim; Michalı́k, Jozef; Schlögl, Ján; Wagreich, Michael

doi:10.1007/bf02667709

Cited by 24 publications

(34 citation statements)

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“…On the basis of co-occurrence of clotted micrite and stromatactis structures, it has been clearly established that these structures indicate presence of organic matter in increased amount e.g. decayed sponges or microbial activity (Aubrecht et al, 2002;Hladil, 2005;Neuweiler and Bernoulli, 2005). Sponge spicules and skeletons are rare elements in the analysed thin sections.…”

mentioning

confidence: 97%

Microfacies associations of Middle and Upper Triassic slope and basin carbonates deposited along the Neo-Tethyan margin, NE Hungary

Horváth¹,

Hips²

2015

AJES

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Microfacies types presented here are based on thin section analysis of more than 1.500 samples from drilling cores, surface sections and several outcrops from Middle and Upper Triassic slope and basin carbonates in the Aggtelek-Rudabánya Hills (Hungary).The observed compositional and textural types were grouped into five microfacies associations which are characteristic for slope and basin environments. The clotted micrite "boundstone" typically contains bioclasts, peloids and stromatactis structures. The inhomogeneous clotted micrite-rich groundmass suggests that the sediment originated from mats or mounds enriched in organic matter. Bioclastic wackestone with radiolarians, pelagic bivalve shells and signs of bioturbation was likely deposited in deep-water basinal environment. Bioclastic grainstone-packstone and bivalve-crinoid packstone deposited from turbidity currents which often occurred along the slope. The mudstones can be found after events of sudden deepening, mostly related to the drowning of the Steinalm platform. Data based on comparison of stratigraphical logs show that the Middle Triassic was characterised by rapid deepening followed by the formation and expansion of a carbonate slope. During the Late Triassic, the breakup of the Wetterstein platform had an effect on slope environment as well.Die hier präsentierten Mikrofazies-Typen basieren auf der Analyse von mehr als 1500 Proben der Region Aggtelek-Rudabanya

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confidence: 97%

Microfacies associations of Middle and Upper Triassic slope and basin carbonates deposited along the Neo-Tethyan margin, NE Hungary

Horváth¹,

Hips²

2015

AJES

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“…Such superposition, although usually not immediately evident due to tectonic complications, seems to be relatively common. We observed it and examined it palynologically in the Hałuszowa Stream section (just above the site described in Barski et al 2012), in the road cut north of the Chotuč Pass at Vršatské Podhradie (Segit 2010), in the stream escarpment south of the large exposure of the Skrzypny Formation at Zázrivá in Western Slovakia (see Aubrecht et al 2004;Segit 2010) and in the road cut near Udol (Ujak) in Eastern Slovakia (see "sideritic limestone" and "marly shales and sandstones" erroneously ascribed to the Cretaceous by Oszczypko et al 2004, fig. 4).…”

Section: Stratigraphy Of the Turbidite Succession (Szlachtowa Formation)mentioning

confidence: 98%

The Middle Jurassic succession in the central sector of the Pieniny Klippen Belt (Sprzycne Creek): implications for the timing of the Czorsztyn Ridge development

Segit¹,

Bronisław²,

Wierzbowski³

2015

Geologica Carpathica

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Abstract:In this study, we revisit the stratigraphic age and discuss sedimentary characteristics of the lower Middle Jurassic turbidite deposits ("black flysch") of the Szlachtowa Formation, as well as the under-and overlying members of the Sprzycne Creek section situated in the central sector of the Pieniny Klippen Belt (Poland). We show that the succession captures the lower Middle Jurassic marine sediments of the pre-Late Albian Magura Basin, located to the north of an ancient submarine swell (Czorsztyn Ridge). The turbidite deposits of the Szlachtowa Formation and marly shales of the Opaleniec Formation yield dinoflagellate cysts indicative of the latest Aalenian or learliest Bajocian to Early Bathonian. The character of these deposits, and their location below the overthrusted Subpieniny Nappe show that this succession does not belong to the successions of the Oravicum domain, located on the southern side of the Czorsztyn Ridge. The Szlachtowa Formation is underlain by the Skrzypny Formation, which is reported for the first time outside the Oravicum domain. It suggests that the pre-Late Albian Magura Basin came into existence not earlier than during the latest Aalenian, following the rising of the Czorsztyn Ridge. The marly shales assigned here to the Opaleniec Formation of Late Bajocian-Bathonian age and younger marly deposits of Cretaceous age were distinguished in the past as the so-called "Sprzycne beds" of Cretaceous age. However, the combination of these two rock units into a single lithostratigraphic unit is unsuitable because they represent two separated stratigraphical intervals and their contact is tectonic.

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“…The presence of large grains, mainly crinoid ossicles, in stromatactis-bearing limestones has been either mentioned or directly documented in many papers (e.g., Dieken 1996, Kaufmann et al 1999, Schmid et al 2001, Wendt et al 2001, Aubrecht et al 2002a, Woods 2002or da Silva & Boulvain 2004, though it seemed more like a coincidental than an essential feature of these sediments. Only Woods (2002) had written directly about encrinites.…”

Section: Fluid-escape and Dynamic Clogging Effectsmentioning

confidence: 99%

“…Hladil 2005a, b) showed fissures and faults that opened the circulation of pore fluids also in the vertical direction. This makes possible the further diagenetic modification of stromatactis and stromatactis host rocks, as is often (but not always) observed in natural stromatactis sediments -i.e., in cemented and/or recrystallised, uncompacted fine-grained materials, never in strongly compacted and stylolitised, micritic, laminar or nodular limestone beds (e.g., Aubrecht et al 2002b, Hladil 2005b.…”

Section: Fluid-escape and Dynamic Clogging Effectsmentioning

confidence: 99%

“…Bathurst (1959) was probably the first to demonstrate that stromatactis were once cavities. Ideas about role of sediment dewatering in the formation of these cavities emerged several times (e.g., Heckel 1972, Desbordes & Maurin 1974, Bernet-Rollande et al 1981, Monty 1995, Aubrecht et al 2002a, Woods 2002, Barbieri et al 2004or Wet et al 2004, but the effect of this process was either considered to be of secondary importance (with projections of stromatactis or small stromatactis-like forms) or more connected to different types of cavities (zebra-limestone sheet cracks or overpressure fissures opened at bedding planes). Thus the term "stromatactis cavities" began in geology with a broad meaning, being more descriptive than explanative (e.g., Kukal 1971, Bathurst 1982, Dieken 1996, Neuweiler et al 2001or Neuweiler & Bernoulli 2005, and was adopted for uses more directly related to the fields of hydrodynamics and rheology of the sedimentation of particulate suspensions through the application of experiments.…”

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confidence: 99%

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Stromatactis cavities in sediments and the role of coarse-grained accessories

Hladil¹,

Růžička²,

Koptíková³

2006

Bull. Geosci.

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The analysis of previous experimental work made on the simulation of stromatactis-like cavities in rapidly settling suspensions of particulate matter substantiates the continuation of experiments toward identifying the conditions of cavity formation. It has been suggested that the most promising directions in this experimental work involve the simplification of complex factors (e.g., variables that derive from the properties of particles and media, as well as the sedimentation dynamics of slurries). Our new hydrodynamic concept of stromatactis formation addresses the traditional key arguments of previous authors on the origins of stromatactis systems. The direct production of stromatactis-type cavities during the sedimentation of fine particulate, polydisperse, multimodal aquatic suspended matter can be characterized in terms of competition between fluids escaping from compressed, diluted domains, and the dynamic effects of the dense packing of solid particles on their boundaries, the latter gradually overtaking from the former, until a middle layer of sediment is sufficiently stabilized and the first internal sedimentation from residual suspensions begins. With the earliest stabilization of the grain-supported, skeleton-like structures in the sediment, low domical but surprisingly stable vaults develop above the cavity zones. Underneath the coalescing arched structures, there often remain places in which grains can still be fluidized, and which consequently enable the further widening of these primary cavities. The specific grain size distribution is derived from natural counterparts, an attribute combined with the high internal friction angle, and increases the final sediment cohesion and stability. This process is particularly effective when highly polydisperse-multimodal sediment materials have highly angular, rugged, or potentially cohesive grains. When the relatively coarsest-and finest-grained fractions are present in increased amounts, the energy dissipation of the dense turbulent slurry is enhanced, and the stromatactis-producing mid-layer is gradually sealed by a relatively impermeable, non-stromatactis, very fine-grained cover in the upper part of the deposit. Two categories of experiments are discussed in this paper. The first is aimed at explaining how moderately large particles can interact with each other. In this category of experiments, moderately graded tridisperse mixtures of angular or highly textured particles tended to produce firmly packed clusters with ensuing domical vaulting above cavities. The second group of experiments is based on combinations of bidisperse mixtures of large grains with polydisperse nearly-unimodal matrices of small angular grains. These two components, if used separately, have close to zero capacity for producing any type of stromatactis-like cavities. However, once they were combined, even modest amounts of these large grains led to the growth of spacious cavity systems, particularly if artificial crinoid columnals were present. The comparison of our experimental r...

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Middle Jurassic stromatactis mud-mound in the Pieniny Klippen Belt (Western Carpathians)

Cited by 24 publications

References 40 publications

Microfacies associations of Middle and Upper Triassic slope and basin carbonates deposited along the Neo-Tethyan margin, NE Hungary

Microfacies associations of Middle and Upper Triassic slope and basin carbonates deposited along the Neo-Tethyan margin, NE Hungary

The Middle Jurassic succession in the central sector of the Pieniny Klippen Belt (Sprzycne Creek): implications for the timing of the Czorsztyn Ridge development

Stromatactis cavities in sediments and the role of coarse-grained accessories

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