Ideal body analysis of the Pomerania Gravity Low (northern Poland)

Petecki, Zdzisław

doi:10.7306/gq.1485

Cited by 3 publications

(16 citation statements)

References 12 publications

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“…The event-related carbonate marker of the Reda Member occurs within the Kociewie Formation (Text-fig. 2A), recognised as comprising flysch-like sedimentary rocks, deposited with the participation of turbidity currents (Jaworowski 1971;Jaworowski 2000) in a distal foredeep setting. Subsequent elements of the Silurian succession of the Pasłęk IG-1 borehole section (Tomczyk 1973) are in general typical for the entire SW margin of the East European Craton.…”

Section: Geological and Palaeogeographic Settingmentioning

confidence: 99%

“…Record of density currents. The Reda Member occurs within the Kociewie Formation, which contains numerous beds of siltstones interpreted as being formed by turbidity currents (Jaworowski 1971;Jaworowski 2000). The siltstone contribution distinctly increases towards the base of the Reda Member; inside the member, however, the record of redeposition is surprisingly sparse and represented by single intercalations of massive to cross-laminated calcisiltites occurring in two microfacies varieties (facies Da and Db).…”

Section: Sedimentary Processes and Depositional Environments Of The R...mentioning

confidence: 99%

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Acta Geologica Polonica

Kozłowski

2020

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The mid-Ludfordian pronounced, positive carbon isotope excursion (CIE), coincident with the Lau/kozlowskii extinction event, has been widely studied so far in shallow-water, carbonate successions, whereas its deep-water record remains insufficiently known. The aim of this research is to reconstruct the sedimentary environments and the palaeoredox conditions in the axial part of the Baltic-Podolian Basin during the event. For these purposes, the Pasłęk IG-1 core section has been examined using microfacies analysis, framboid pyrite diameter and carbon isotope measurements. The prelude to the event records an increased influx of detrital dolomite interpreted as eolian dust, coupled with a pronounced decrease in the diameter of the pyrite framboids, indicating persistent euxinic conditions across the event. The event climax is recorded as the Reda Member and consists of calcisiltites, composed of calcite microcrystals (‘sparoids’), which are interpreted as suspensoids induced by phytoplankton blooms in the hipersaturation conditions present in the epipelagic layer of the basin. Both the prelude and climax facies show lamination, interpreted as having resulted from periodical settling of marine snow, combined with hydraulic sorting within a ‘benthic flocculent layer’, which additionally may be responsible for a low organic matter preservation rate due to methanogenic decomposition. Contrary to the observed basinward CIE decline in the benthic carbonates in the basin, the Reda Member records an extremely positive CIE (up to 8.25‰). Given the pelagic origin of the sparoids, the CIE seems to record surface-water carbon isotope ratios. This points to a large carbon isotope gradient and kinetic fractionation between surface and bottom waters during the mid-Ludfordian event in a strongly stratified basin. The Reda facies-isotope anomaly is regarded as undoubtedly globally triggered, but amplified by the stratified and euxinic conditions in the partly isolated, Baltic-Podolian basin. Hence, the common interpretation of the basin record as representative for the global ocean needs to be treated with great caution.

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Section: Geological and Palaeogeographic Settingmentioning

confidence: 99%

Section: Sedimentary Processes and Depositional Environments Of The R...mentioning

confidence: 99%

Acta Geologica Polonica

Kozłowski

2020

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“…1). The wedge is interpreted as the distal fill of a Caledonian foredeep that originated due to the collision of East Avalonia with Baltica (Poprawa et al 1999;Jaworowski 2000;Giese and Köppen 2001;Poprawa 2006). The fill thins and onlaps eastwards the EEC.…”

Section: Geological Settingmentioning

confidence: 99%

“…Siliciclastic and calcareous silt lenses, solitary laminae and occasional laminasets as well as The Pelplin Formation grades upwards and laterally (to the NW) into grey, graptolitic, dolomitic and calcareous, massive and laminated mudstones, which are interbedded with frequent siltstones, carbonate concretions, bentonites and rare sandstones. These sediments constitute the Kociewie Formation (mid-Sheinwoodian-Ludfordian), which is a synorogenic wedge supplied from the Caledonian accretionary prism to the NW and W (Jaworowski 2000;Poprawa 2006). Both mudstones and coarser-grained sediments provide evidence of event deposition from turbidity currents, storm-generated currents and traction currents (Jaworowski 1971(Jaworowski , 2000McCaan 1996;Modliński and Podhalańska 2010).…”

Section: Geological Settingmentioning

confidence: 99%

“…These sediments constitute the Kociewie Formation (mid-Sheinwoodian-Ludfordian), which is a synorogenic wedge supplied from the Caledonian accretionary prism to the NW and W (Jaworowski 2000;Poprawa 2006). Both mudstones and coarser-grained sediments provide evidence of event deposition from turbidity currents, storm-generated currents and traction currents (Jaworowski 1971(Jaworowski , 2000McCaan 1996;Modliński and Podhalańska 2010). The presence of micro-hummocky cross-stratification, gutter casts and combined-flow mud ripples (Porębski et al 2013) suggests shallowing into middle neritic depths (offshore-shelf transition zone).…”

Section: Geological Settingmentioning

confidence: 99%

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Acta Geologica Polonica

Bojanowski

Kędzior

Porębski

et al. 2019

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The Silurian Pelplin Formation is a part of a thick, mud-prone distal fill of the Caledonian foredeep, which stretches along the western margin of the East European Craton. The Pelplin Formation consists of organic carbon- rich mudstones that have recently been the target of intensive investigations, as they represent a potential source of shale gas. The Pelplin mudstones host numerous calcite concretions containing authigenic pyrite and barite. Mineralogical and petrographic examination (XRD, optical microscopy, cathodoluminoscopy, SEM-EDS) and stable isotope analyses (δ13Corg, δ13C and δ18O of carbonates, δ34S and δ18O of barite) were carried out in order to understand the diagenetic conditions that led to precipitation of this carbonate-sulfide-sulfate paragenesis and to see if the concretions can enhance the understanding of sedimentary settings in the Baltic and Lublin basins during the Silurian. Barite formed during early diagenesis before and during the concretionary growth due to a deceleration of sedimentation during increased primary productivity. The main stages of concretionary growth took place in yet uncompacted sediments shortly after their deposition in the sulfate reduction zone. This precompactional cementation led to preferential preservation of original sedimentary structures, faunal assemblages and early- diagenetic barite, which have been mostly lost in the surrounding mudstones during burial. These components allowed for the reconstruction of important paleoenvironmental conditions in the Baltic and Lublin basins, such as depth, proximity to the detrital orogenic source and marine primary productivity. Investigation of the concretions also enabled estimation of the magnitude of mechanical compaction of the mudstones and calculation of original sedimentation rates. Moreover, it showed that biogenic methane was produced at an early-diagenetic stage, whereas thermogenic hydrocarbons migrated through the Pelplin Formation during deep burial.

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The Pomerania Gravity Low at the East European Craton margin – a granitic batholith or a Paleoproterozoic impact structure?

NARKIEWICZ,

PETECKI

2024

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As so ci ate Ed i tor: Jacek Szczepañski The Pomerania Grav ity Low is a reg u lar large-am pli tude, oval anom aly of dis put able or i gin lo cated at the East Eu ro pean Craton mar gin. In the past it has been in ter preted as a Pro tero zoic crustal keel or an Early Pa leo zoic/Perm ian-Me so zoic depocentre. The or i gin of the anom aly has been re con sid ered based on a re in ter pre ta tion of pre vi ous po ten tial fields, seismic and magnetotelluric data and re cent gravimetric mod el ling re sults. New al ter na tive in ter pre ta tions are pro posed and discussed, namely a fel sic in tru sion re lated to the Transscandinavian Ig ne ous Belt and a large im pact struc ture dat ing to ~1.6-1.8 Ga. The data as sem bled, to gether with re gional com par i sons, make the im pact or i gin seem more prob a ble. Nev erthe less, pro longed ero sion, deep burial and a meta mor phic over print ham per test ing of this hy poth e sis, e.g., through find ing im pact ejecta or shock-af fected min er als.

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Ideal body analysis of the Pomerania Gravity Low (northern Poland)

Cited by 3 publications

References 12 publications

Acta Geologica Polonica

Acta Geologica Polonica

Acta Geologica Polonica

The Pomerania Gravity Low at the East European Craton margin – a granitic batholith or a Paleoproterozoic impact structure?

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