Proterozoic and early Palaeozoic microfossils in the Karikkoselkä impact crater, central Finland

Uutela, A.

doi:10.17741/bgsf/73.1-2.006

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Fossil assemblages from Karikkoselkä, Finland (Uutela ), Arkhangelsk in the White Sea area of Russia (Tolmacheva et al . ) and the southern Ural Mountains (Dubinina & Ryazantsev ) served as additional information but were not treated statistically.…”

Section: Localities and Materialsmentioning

confidence: 99%

“…Discoveries of Ordovician acritarchs from the Karikkoselkä impact crater c . 200 km north of Helsinki, Finland (Uutela ) and Ordovician conodonts from xenoliths in kimberlite pipes near Arkhangelsk, NW Russia (Tolmacheva et al . ) demonstrate that parts of Finland and the White Sea area of Russia were covered by the sea during the Ordovician (Fig.…”

Section: Baltoniodus–microzarkodina Biofaciesmentioning

confidence: 99%

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Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Rasmussen

Stouge

2018

Palaeontology

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The Middle Ordovician conodont genera that are suitable for palaeoenvironmental interpretations from the epicontinental Baltoscandian platform have been identified and evaluated to establish and describe conodont biofacies and their relationship to global cooling. The construction of biofacies was based on multivariate statistical analyses of more than 375 700 conodont specimens from 520 samples and 21 localities across Baltica. Three distinct, recurrent and laterally extensive conodont biofacies existed across the Baltoscandian platform of the Baltica continent during the Dapingian and early to middle Darriwilian stages (Middle Ordovician). A relatively shallow water conodont assemblage named the Baltoniodus–Microzarkodina Biofacies characterized the inner shelf localities in central Sweden, Estonia, Russia and Ukraine. In the distal shelf areas, patterns are more complex. Here, genera of the Periodon Biofacies characterized the shelf margin areas of the Scandinavian Caledonides facing the relatively warm Iapetus Ocean towards the north, whereas the Protopanderodus Biofacies dominated the distal shelf areas facing the cooler Tornquist Sea towards the south‐west. Although these three main biofacies continued to dominate during the succeeding Darriwilian stage, distinct changes in the distribution of biofacies took place during the transition from the Dapingian Stage to the Darriwilian. We argue that the biofacies change was triggered by a regressive event related to early Darriwilian cooling, and that the palaeoclimatological changes influenced the Baltic conodont faunas near the Tornquist Sea margin before those of the Iapetus margin (early vs middle Darriwilian).

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Section: Localities and Materialsmentioning

confidence: 99%

Section: Baltoniodus–microzarkodina Biofaciesmentioning

confidence: 99%

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Rasmussen

Stouge

2018

Palaeontology

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“…We are grateful to the editor G. Zhao and reviewer G. Viola for their constructive and helpful reviews. Thorslund and Axberg (1979), Simonen (1980), Uutela (1984, 1985), Tynni and Donner (1980), Wannäs and Flodén (1994), Söderberg (1993), Hagenfeldt (1995, Amantov et al (1995), Bonhomme and Welin (1983), Sturt et al (1975), Tynni (1982), Patchett (1978), Tynni and Hokkanen (1982), Lehtovaara (1995), Elo et al (1993), Bergman (1982), Winterhalter (1982), Uutela (1990Uutela ( , 2001, Tynni (1978)…”

Section: Acknowledgementsmentioning

confidence: 99%

Constraining the timing of brittle deformation and sedimentation in southern Finland: Implications for Neoproterozoic evolution of the eastern Fennoscandian shield

Elminen

Zwingmann

Kaakinen

2018

Precambrian Research

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Sheared sedimentary clay was found in a faulted fracture in crystalline bedrock in a tunnelling site at 60 m depth in southern Finland. Brittle faults are numerous in the Fennoscandian Palaeoproterozoic bedrock, but only some of them have relative age constraints, while absolute ages are nearly lacking. Sedimentary rocks altogether are uncommon in Finland and only sparsely dated by micropaleontological studies. This study reports K-Ar data of fresh, non-weathered authigenic illite and constrains a time framework for the local faulting and sedimentation. The Neoproterozoic Tonian to Cryogenian ages derived from the grains in diminishing grain-size order are c. 967, 947, 809 and 697 Ma. Results indicate that the formation of the extension fracture is related to the collapse of Sveconorwegian orogeny c. 1000 Ma; clay and mature quartz sand were deposited in this extension fracture in shallow water in an intracratonic basin followed by early diagenetic processes and neocrystallization of illite around 967-947 Ma. The Neoproterozoic 1000-700 Ma sedimentation documented in this study is rare in the Fennoscandian shield as a whole. Neocrystallization of authigenic illite in the finest 0.4 and <0.1 µm fractions c. 809-697 Ma ago is interpreted as resulting from reactivation in the fault due to the continental break-up on the western side of the craton as documented by arenite crosscutting relationships. The younger ages may also be attributed to a Caledonian thermal overprint ca. 410 Ma ago that would influence the 967 Ma age if sufficient thermal energy had been present.

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A story told by calcareous nannofossils—the timing and course of an Eocene meteorite impact in central Jordan

et al. 2018

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Proterozoic and early Palaeozoic microfossils in the Karikkoselkä impact crater, central Finland

Cited by 9 publications

References 18 publications

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Constraining the timing of brittle deformation and sedimentation in southern Finland: Implications for Neoproterozoic evolution of the eastern Fennoscandian shield

A story told by calcareous nannofossils—the timing and course of an Eocene meteorite impact in central Jordan

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