A Silurian reefal succession in the Gotland area, Baltic Sea

Flodén, Tom; Bjerkéus, Monica; Tuuling, Igor; Eriksson, Maria

doi:10.1080/11035890101233137

Cited by 27 publications

(42 citation statements)

References 35 publications

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“…Besides these research borings, written data from 38 commercial drillings (OPAB) on Gotland were used. Seismic reXection surveys of the Baltic sea-Xoor (Flodén et al 2001;Bjerkéus and Eriksson 2001) have revealed a series of reef barriers through the Ludlow (Fig. 3).…”

Section: Methodsmentioning

confidence: 98%

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A sequence stratigraphical model for the Late Ludfordian (Silurian) of Gotland, Sweden: implications for timing between changes in sea level, palaeoecology, and the global carbon cycle

Eriksson

Calner

2007

Facies

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This paper investigates a time interval within the Late Ludfordian (Late Silurian), involving changes in faunal composition (the Lau Event), a major positive carbon isotope excursion (CIE), and contemporaneous sea-level changes in remote palaeo-basins. Based on the Silurian strata of Gotland (Sweden), we integrate sequence stratigraphy, carbon isotope stratigraphy, and platformscale palaeoecological changes associated with this turbulent time period in Earth history. Three depositional sequences (sequences Nos. 1-3), including two separate periods of forced regression (falling stage systems tracts, FSSTs) are identiWed from outcrop and drillcore studies. The sequence stratigraphical framework is interpreted to reXect glacio-eustatic sea-level changes. The CIE starts at the onset of the initial FSST (sequence No. 1), just below the last appearance datum of the conodont Polygnathoides siluricus. The values increase through the ensuing lowstand and transgressive systems tracts (LST and TST) of sequence No. 2 and peak in the following highstand systems tract (HST). A second forced regression (FSST of sequence No. 2) took place in the lower Ozarkodina snajdri Zone. 13 C data are scarce from these siliciclastic strata, but inferably remain high. The 13 C values increase within the LST and earliest TST of sequence No. 3, before a decreasing trend starts within the early TST. 13 C values return to pre-excursion levels within the ensuing HST. The CIE is closely associated with an increase in stromatolites (mats and oncoids) across a wide range of depths and sedimentary environments, and correlations to other basins indicate a global increase in cyanobacterial activity. A drastic decline in level-bottom benthic faunas during the FSST of sequence No. 2 is, however, interpreted as a local response to the progradation of a delta complex (the Burgsvik Sandstone). Biological carbonate production replenishes rapidly within the TST of sequence No. 3, succeeding a thin LST dominated by reworked siliciclastics and chemically precipitated carbonates (ooids). The detailed relationship between the CIE and sea-level change presented herein is not fully consistent with previous reports on the CIEs associated with the lower Silurian Ireviken and Mulde events, respectively. Based on our facies analysis and sequence stratigraphical interpretation, two main mechanisms are suggested as responsible for the Late Ludfordian CIE: (1) a change in the riverine C-weathering Xux towards the 13 C end member following glacio-eustatically induced subaerial exposure of carbonate platforms throughout the tropics, and, (2) increased photosynthetic activity by benthic cyanobacteria exaggerating the 13 C values of precipitated carbonates.

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Section: Methodsmentioning

confidence: 98%

“…3a) developed within the "biohermal slope area" of the reef barrier complex of sequence No. 1 (the B3 reef barrier of Flodén et al 2001;Fig. 3a).…”

Section: Palaeoecologymentioning

confidence: 99%

A sequence stratigraphical model for the Late Ludfordian (Silurian) of Gotland, Sweden: implications for timing between changes in sea level, palaeoecology, and the global carbon cycle

Eriksson

Calner

2007

Facies

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“…Samtleben et al 2000;Baarli et al 2003), the reconstructed facies patterns are based mainly on seismic profile analyses (e.g. Flodén et al 2001;Bjerkéus and Eriksson 2001) and are thus only interpretations.…”

Section: General Regional and Stratigraphical Setting Of The Silurianmentioning

confidence: 99%

Recent studies on the Silurian of the western part of Ukraine

Łuczyński

Skompski²,

Kozłowski³

2016

Acta Geologica Polonica

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ABSTRACT:Łuczyński, P., Skompski, S. and Kozłowski, W. 2016. Recent studies on the Silurian of the western part of Ukraine. Acta Geologica Polonica, 66 (3), 281-297. Warszawa.The paper summarises the effects of recent studies carried out by a team from the Department of Historical and Regional Geology of the Faculty of Geology, University of Warsaw on the upper Silurian of Podolia (western part of Ukraine).The sedimentary history of the Silurian succession of Podolia is characterised by its cyclic pattern, with shallowing-upward cyclothems. In the traditional interpretation, the occurrence of stromatoporoid beds within each cyclothem marks the deepest (or most open-marine) sedimentary environment within the cycle. According to the results of recent studies, their occurrence is connected rather with a relatively shallow-water environment and with high energy phenomena. A substantial reinterpretation of the main sedimentary processes governing the deposition and facies distribution on the shelf is presented. Particularly, there are recognised and described high-energy sedimentary events repeatedly punctuating the generally calm sedimentation that prevailed in the lagoonal settings, some of which are interpreted as tsunami induced.Further perspectives for studies on the Silurian successions of Podolia are also discussed. The main problem is the precise correlation of particular sections that are scattered over vast distances and developed in similar facies associations.

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“…Ex ten sive seis mic pro fil ing since the early 1960s has resulted in a huge amount of data about the dis tri bu tion, thick -nesses, and thus struc ture of dif fer ent Pa leo zoic lay ers beneath the cen tral Bal tic Sea (Flodén, 1975(Flodén, , 1980Flodén et al, 1994Flodén et al, , 2001Tuuling et al, 1995Tuuling et al, , 1997Tuuling and Flodén 2000a, 2009a, b, 2011. Fus ing this in forma tion with the sur round ing main land knowl edge, this pa per aims to gen er al ise the struc ture of the plat form sed i men tary cover on the south ern slope of the Bal tic Shield, and to analyse its changes/trends from Es to nia to the Swed ish east coast.…”

Section: Introductionmentioning

confidence: 99%

Paleozoic rocks structure versus Cenozoic cuesta relief along the Baltic Shield–East European Platform transect

Tuuling

2017

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1 Uni ver sity of Tartu, In sti tute of Ecol ogy and Earth Sci ences, Ravila 14A, 50411 Tartu, Es to nia Tuuling, I., 2017. Pa leo zoic rocks struc ture ver sus Ce no zoic cuesta re lief along the Bal tic Shield-East Eu ro pean Plat form transect. Geo log i cal Quar terly, 61 (2): 396-412, doi: 10.7306/gq.1342Based on struc tural maps, the bed rock struc ture on the south ern slope of the Bal tic Shield is ana lysed. Gently south erly dipping (0.1-0.2°) Paleozoic lay ers from Es to nia to the Swed ish east coast form the Bal tic Homocline (BH). Nu mer ous monoclinal folds, forced by base ment fault ing, in duce slight vari a tions in bed rock at ti tude across the BH. Stud ies on faults ex posed in South ern Fin land sug gest that many monoclinal folds in duc ing base ment faults within the BH are of Pre cam brian or i gin and have been ac tive in pulses. The pres ent mono clines were shaped by the Cal edo nian Orog eny. Submeridional tectonic hinge-lines in duce mi nor re gional-scale changes in the struc tural set ting and con trol trends/styles of the forced folds. From the west, the BH bounds with the Bal tic-Bothnian mo bile zone that has been in ter mit tently ac tive since Mesoproterozoic times. The evolv ing Bal tic Syneclise in the Si lu rian re ar ranged the struc tural set ting typ i cal for the Or do vician Bal tic Ba sin. The Ce no zoic up lift of Scan di na via cre ated a SE-to-E-dip ping bed rock se quence around the Gotland-Öland area. As the lat ter area had a dif fer ent at ti tude than the BH, two Ce no zoic cuesta-sets started to evolve around the north ern Bal tic Proper. They both had an out let to the N-S-flow ing Eridanos River around the Gotska Sandön area, cre at ing thus two in de pend ent sec tions of the Bal tic Klint.

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A Silurian reefal succession in the Gotland area, Baltic Sea

Cited by 27 publications

References 35 publications

A sequence stratigraphical model for the Late Ludfordian (Silurian) of Gotland, Sweden: implications for timing between changes in sea level, palaeoecology, and the global carbon cycle

A sequence stratigraphical model for the Late Ludfordian (Silurian) of Gotland, Sweden: implications for timing between changes in sea level, palaeoecology, and the global carbon cycle

Recent studies on the Silurian of the western part of Ukraine

Paleozoic rocks structure versus Cenozoic cuesta relief along the Baltic Shield–East European Platform transect

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