[Lehnert] Ordovician climate change, sea level history and bioevents: the Baltoscandic record

German Title: Ordovician climate change, sea level history and bioevents: the Baltoscandic record

Abbreviation: 287

Current Status: completed

Main Applicant:Dr. Oliver Lehnert

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Year: 2011


The Siljan impact structure preserves unique Lower Palaeozoic sedimentary successions in its ring-like depression around the central uplift. The stratigraphy investigated in three core sections and visited outcrops provides surprisingly new informations about the development of this area that palaeogeographically was located near the western margin of Baltica. Based on these new data, several facies belts related to the Ordovician-Silurian foreland basin development can be recognized in the sedimentary record of this area, some 100 km away from the Caledonian front. The cores comprise strata ranging from the late Tremadocian to Wenlock in age and provide a huge dataset for studies in palaeoclimate, sea level, and changes in ecosystems. The discovery of multiple karst horizons and palaeocave formations in the Late Ordovician and Early Silurian strata of the Siljan area can be correlated to the sea level record in other parts of Baltica and on other palaeocontinents suggesting recurrent subaerial exposure of the Baltoscandian shelf during glacioeustatic sea level lowstands. The volcanic record (K-bentonites) can be correlated with ash layers in other parts of Baltoscandia, and serve as chronostratigraphic time-lines in a detailed stratigraphic framework including litho-, bio-, chemo- and sequence stratigraphic parameters. Within the upper part of the Silurian clastic succession in the western part of the ‘Siljan Ring’, we recognize the progradation of a delta system reflecting a regression in an overall subsiding basin, likely due to a global sea-level drop during the Sheinwoodian (early Wenlock) glaciation exposing the forebulge area to the west. Biogeochemical data of the siliciclastics suggest deposition in a range of lacustrine to brackish and marine environments. Biomarker data support deposition in a backbulge basin developed in the eastern part of the Caledonian foreland basin system forming during the collision between Laurentia and Baltica.

Related Publications

Younes, Hani, Calner, Mikael, Lehnert, Oliver (2017). "The first continuous δ13C record across the Late Silurian Lau Event on Gotland, Sweden" GFF 139 p63-69

Kröger, Björn, Ebbestad, Jan Ove R, Lehnert, Oliver (2016). "Accretionary Mechanisms and Temporal Sequence of Formation of the Boda Limestone Mud-Mounds (Upper Ordovician), Siljan District, Sweden" Journal of Sedimentary Research 86 p363-379

Wu, Rongchang, Calner, Mikael, Lehnert, Oliver (2016). "Integrated conodont biostratigraphy and carbon isotope chemostratigraphy in the Lower–Middle Ordovician of southern Sweden reveals a complete record of the MDICE" Geological Magazine 154 p334-353

KRÖGER, BJÖRN, HINTS, LINDA, LEHNERT, OLIVER (2016). "Ordovician reef and mound evolution: the Baltoscandian picture" Geological Magazine p1-24

Muhamad, Harbe, Juhlin, Christopher, Lehnert, Oliver, Meinhold, Guido, Andersson, Magnus, Garcia Juanatey, Maria, Malehmir, Alireza (2015). "Analysis of borehole geophysical data from the Mora area of the Siljan Ring impact structure, central Sweden" Journal of Applied Geophysics 115 p183-196

Wu, Rong-Chang, Calner, Mikael, Lehnert, Oliver, Peterffy, Olof, Joachimski, Michael M. (2015). "Lower–Middle Ordovician δ13C chemostratigraphy of western Baltica (Jämtland, Sweden)" Palaeoworld 24 p110-122

Kröger, Björn, Ebbestad, Jan Ove R, Lehnert, Oliver, Ullmann, Clemens V, Korte, Christoph, Frei, Robert, Rasmussen, Christian MØ (2015). "Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations" Journal of the Geological Society 172 p349-356

Kröger, Björn, Hints, Linda, Lehnert, Oliver (2014). "Age, facies, and geometry of the Sandbian/Katian (Upper Ordovician) pelmatozoan-bryozoan-receptaculitid reefs of the Vasalemma Formation, northern Estonia" Facies p963-986

Sturkell, Erik, Juhlin, Christopher, Ormö, Jens, Ebbestad, Jan Ove R., Greiling, Gerhard R. O., Högström, Anette, Kotny, Agnes M., Lehnert, Oliver, Meinhold, Guido (2014). "Concentric Impact Structures in the Palaeozoic (CISP)" 31st Nordic Geological Winter Meeting, 8-10 January 2014, Lund, Sweden p165

Ahmed, Manzur, Lehnert, Oliver, Fuentes, David, Meinhold, Guido (2014). "Origin of oil and bitumen in the Late Devonian Siljan impact structure, central Sweden" Organic Geochemistry p13-26

Kröger, Björn, Hints, Linda, Lehnert, Oliver, Männik, Peep, Joachimski, Michael (2014). "The early Katian (Late Ordovician) reefs near Saku, northern Estonia and the age of the Saku Member, Vasalemma Formation" Estonian Journal of Earth Sciences p271

Calner, Mikael, Lehnert, Oliver, Wu, Rongchang, Dahlqvist, Peter, Joachimski, Michael M (2014). "δ 13C chemostratigraphy in the Lower–Middle Ordovician succession of Öland (Sweden) and the global significance of the MDICE" GFF p48-54

Lehnert, Oliver, Meinhold, Guido, Wu, Rongchang, Calner, Mikael, Joachimski, Michael M (2014). "δ13C chemostratigraphy in the upper Tremadocian through lower Katian (Ordovician) carbonate succession of the Siljan district, central Sweden" Estonian Journal of Earth Sciences p277

Pouille, Lauren, Delabroye, Aurélien, Vandenbroucke, Thijs R. A., Calner, Mikael, Lehnert, Oliver, Vecoli, Marco, Danelian, Taniel (2013). "Chitinozoan biostratigraphy across the Katian (Late Ordovician) GICE event in the Borenshult-1 drillcore (Sweden)" Review of Palaeobotany and Palynology 198 p134-144

Arslan, Arzu, Meinhold, Guido, Lehnert, Oliver (2013). "Ordovician sediments sandwiched between Proterozoic basement slivers: tectonic structures in the Stumsnäs 1 drill core from the Siljan Ring, central Sweden" GFF 135 p213-227

Lehnert, Oliver, Meinhold, Guido, Arslan, Arzu, Ebbestad, Jan Ove R, Calner, Mikael (2013). "Ordovician stratigraphy of the Stumsnäs 1 drill core from the southern part of the Siljan Ring, central Sweden" GFF 135 p204-212

Calner, Mikael, Ahlberg, Per, Lehnert, Oliver, Erlström, M (2013). "The Lower Palaeozoic of southern Sweden and the Oslo Region, Norway" Field Guide for the 3rd Annual Meeting of the IGCP Project

Juhlin, Christopher, Sturkell, Erik, Ebbestad, Jan Ove R., Lehnert, Oliver, Högström, Anette E. S., Meinhold, Guido (2012). "A new interpretation of the sedimentary cover in the western Siljan Ring area, central Sweden, based on seismic data" Tectonophysics 580 p88-99

Ahmed, Manzur, Lehnert, Oliver, Fuentes, David, Sestak, Stephen, Meinhold, Guido, Gong, Se (2012). "Biomarker evidence for the origin of seep oil and solid bitumen from the Late Devonian Siljan impact structure, Sweden" Organic Geochemistry 68

Calner, Mikael, Lehnert, Oliver, Jeppsson, Lennart (2012). "New chemostratigraphic data through the Mulde Event interval (Silurian, Wenlock), Gotland, Sweden" GFF 134 p65-67

Lehnert, Oliver, Meinhold, Guido, Bergström, Stig M, Calner, Mikael, Ebbestad, Jan Ove R, Egenhoff, Sven, Frisk, Åsa M, Hannah, Judith L, Högström, Anette ES, Huff, Warren D (2012). "New Ordovician–Silurian drill cores from the Siljan impact structure in central Sweden: an integral part of the Swedish Deep Drilling Program" GFF 134 p87-98