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A putative Tournaisian and Visean volcanic-sedimentary succession in the Lublin Basin, SE Poland: depositional processes, petrological characteristics and sequence stratigraphy

Waksmundzka Maria I., Kozłowska Aleksandra, Pańczyk Magdalena

Acta Geologica Polonica

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2021

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Vol. 71, no. 3

305--344

EN

The aim of this study was to establish the stratigraphic extent of a putative Tournaisian Stage within the Carboniferous succession in the Lublin Basin. The oldest part of the succession, known as the Huczwa Formation and comprising depositional sequences 1-4, was investigated based on lithofacies analysis, sequence stratigraphy and petrographic studies. The article provides descriptions of depositional sequences, parasequences (cyclothems) and lithofacies that were formed in a range of environments (elements of depositional architecture) and as a result of volcanic processes - lava and pyroclastic eruptions and chemical weathering of their products. Correlation of the sequence stratigraphy to the West European and global Carboniferous chronostratigraphic divisions, as well as to the Khoriv suite in the Lviv-Volyn Basin in adjacent Ukraine, indicates a putative late Tournaisian age for sequence 1, and a late Visean age for sequences 2-4. There is a stratigraphic gap between sequences 1 and 2, spanning probably the uppermost Tournaisian and the lower and middle Visean. The upper Tournaisian is represented by the FRST-LST deposits of sequence 1, comprising mainly volcaniclastic conglomerates and sandstones developed in braided-river channels and incised valleys with hyperconcentrated flow processes. These deposits are represented by polymictic paraconglomerate and lithic/sublithic/subarkose arenites or sublithic wackes, and contain predominantly grains of acidic and alkaline volcanic and igneous rocks. This material probably came from the Łuków-Wisznice Elevation and the Volynian Polesia region, located to the NE and E of the Lublin Basin. In the uppermost part of sequence 1, volcanic rocks and tuffs appear which developed during the activity of at least three volcanic cones in the Lublin Basin. The volcanoes were the source of alkaline lavas in the central and SW areas of the basin, and of acidic lavas in the SE area, previously undescribed. The Visean sequences 2-4 consist of the FRST-LST sediments deposited within incised valleys. The TST and HST deposits accumulated mainly in a shallow ramp-type carbonate shelf, shallow clayey shelf and deltaic environments.

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Early Carboniferous chondrichthyans from the Mobarak Formation, Central Alborz Mountains, Iran

Habibi T., Ginter M.

Acta Geologica Polonica

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2011

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Vol. 61, no. 1

27-34

EN

Well exposed Tournaisian, mainly carbonate, rocks of the Mobarak Formation in the area of Shahmirzad village, Central Alborz, Iran, yielded almost 200 chondrichthyan teeth and scales, associated with numerous actinopterygian microremains. Ten different taxa were recognised among the chondrichthyan teeth, of which the most abundant are those representing Euselachii (Protacrodus and Lissodus), Symmoriiformes (Denaea), and Phoebodontiformes (Thrinacodus). The high relative abundance of protacrodont crushing teeth, but lack of holocephalian dental elements suggest that the sediments forming the Shahmirzad section were deposited in a shallow shelf environment, but probably not on a carbonate platform.

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Nowe dane palinologiczne na temat turneju wyższego z synkliny borkowskiej w Górach Świętokrzyskich (Jabłonna IG1)

Filipiak P.

Przegląd Geologiczny

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2000

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Vol. 48, nr 12

1156-1159

PL

Analiza palinologiczna trzynastu próbek z otworu wiertniczego Jabłonna IG1 wykazała, że tylko dwie z nich, pochodzące z warstw zarębiańskich, są pozytywne. Wiek tych próbek określono na późny turnej (żony mikroflorystyczne PC i CM). Pozostałe składniki kerogenu to liczne prazynofity (Leiosphaeridium i Tasmanites), pojedyncze akritarchy, tkanki roślin wyższych oraz substancja amorficzna.

EN

Thirteen samples from the Jabłonna IG1 borehole were palynologicaly examined, only two of them (from Zareby Beds) contained palynomorphs. The age of those samples is determined as late Tournaisian (PC and CM Miospore Zones). Remaining components of kerogen are: numerous Prasinophyta (Leiosphaeridium and Tasmanites), solitary Acritarcha, fragments of plants conductive tissue and amorphous matter.