Journal ArticleDOI
Hydrodynamic control of sedimentation in the Ordovician (Arenig–Caradoc) Baltic Basin
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In this paper, changes in mineralogy, geochemistry and grain size in a deep shelf succession from the Ordovician Baltic Basin are used to determine shifts in marine current direction and sea-level fluctuations.Abstract:
Changes in mineralogy, geochemistry and grain size in a deep shelf succession from the Ordovician Baltic Basin are used to determine shifts in marine current direction and sea-level fluctuations. The analyses show a long-term, relatively stable interval in the Arenig–Llanvirn followed by shorter periods of perturbations and rearrangements in the early Caradoc. The Arenig deposits of the Aizpute-41 core have a high 2–10 µm terrigenous component. During the Llanvirn the proportion of this size fraction diminished. The grain size change was accompanied by mineralogical changes. In the early Caradoc the kaolinite disappeared, the muscovite content decreased, and quartz and albite increased. This and several geochemical indicators point to an input of considerable part of sediment from different sources than in the Arenig–Llanvirn. Two currents, a southwesterly for the Arenig and a westerly for the early Caradoc, are proposed. A red facies belt in the deep shelf marks the pathway of the Arenig–Llanvirn current. Smaller shifts in SiO2/Al2O3 ratio in the Aizpute-41 section are interpreted as reflecting transgressions and regressions corresponding to regional stage boundaries.read more
Citations
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The structure and stratigraphy of the sedimentary succession in the Swedish sector of the Baltic Basin: New insights from vintage 2D marine seismic data
TL;DR: In this paper, the authors presented five interpreted regional seismic profiles, describing the full sedimentary sequence across the Swedish sector of the Baltic Sea, and used the seismic interpretation to infer the structural and stratigraphic history of both the Swedish and Hano Bay basins.
Journal ArticleDOI
Reconstruction of currents in the Mid-Ordovician-Early Silurian central Baltic Basin using geochemical and mineralogical indicators
TL;DR: In the central part of the Mid-Ordovician-Early Silurian Baltic Basin, two different transport pathways of terrigenous material can be recognized as discussed by the authors, and the sediment transport was carried out by water flows, which turned into rapid currents from time to time.
Journal ArticleDOI
Pigmentation of the Early Silurian shallow marine red beds in South China as exemplified by the Rongxi Formation of Xiushan, southeastern Chongqing, central China
TL;DR: In this paper, the authors focused on the shallow marine clastic red beds developed in South China during the Silurian and found that the color differentiation of sediments shows little relevance to the bottom redox potential shift but has a close relationship to grain size and sediment sorting which may be caused by sea level changes and tides.
Journal ArticleDOI
A probabilistic assessment of the effective CO2 storage capacity within the Swedish sector of the Baltic Basin
TL;DR: In this paper, a regional assessment of the effective CO2 storage capacity within the Swedish Sector of the Baltic Sea Basin has been performed, where Stratigraphic and structural traps were considered within the Faludden, Nar and Viklau reservoirs.
Journal ArticleDOI
Diversity and biostratigraphic utility of Ordovician brachiopods in the East Baltic.
TL;DR: In this article, the authors evaluated the role and potential of brachiopod faunas in the modern stratigraphy of the Ordovician carbonates of Baltoscandia.
References
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Journal ArticleDOI
Baltica from the late Precambrian to mid-Palaeozoic times: The gain and loss of a terrane's identity
TL;DR: The old terrane of Baltica occupies the mass of northern Europe eastwards to the Urals and lies mostly to the north of the Trans-European Suture Zone The core, the East European Craton, is thick and formed of rocks dating back to well over 3 billion yr, and Protobaltica can be identified as forming part of the supercontinent of Rodinia at about 1 billion yr ago as mentioned in this paper.
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Long-lived glaciation in the Late Ordovician? Isotopic and sequence-stratigraphic evidence from western Laurentia
TL;DR: In this article, an integrated δ13C and sequence stratigraphic analysis in Nevada is presented, showing that in the Late Ordovician Chatfieldian Stage (mid-Caradoc) a positive δ 13C excursion in the upper part of the Copenhagen Formation was closely followed by a regressive event evidenced within the prominent Eureka Quartzite.
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Sr, C, and O isotope geochemistry of Ordovician brachiopods: A major isotopic event around the Middle-Late Ordovician transition
Graham A. Shields,Giles A.F. Carden,Jαn Veizer,Jαn Veizer,Tõnu Meidla,Jia-Yu Rong,Rong-Yu Li +6 more
TL;DR: In this paper, the first Ordovician-wide isotope curves for marine calcite were presented based on analyses of 206 calcitic brachiopods from 10 localities worldwide.
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A global model for the early diagenesis of organic carbon and organic phosphorus in marine sediments
TL;DR: In this article, a model for the early diagenesis of organic matter in marine sediments was developed for inclusion in global circulation models and is based on a single master variable, the sedimentation rate.
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The Tornquist Sea and Baltica Avalonia docking
TL;DR: In this article, the authors proposed that explosive vents associated with this subduction and related to Andean-type magmatism in Avalonia were the source for the gigantic mid-Caradoc (c. 455 Ma) ash fall in Baltica (i.e. the Kinnekulle bentonite).