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Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitude

Leonid E Popov, Javier J Alvaro, View ORCID ProfileLars E Holmer, Heikki Bauert, Mansoureh Ghobadi Pour, Andrei V Dronov, Oliver Lehnert, Olle Hints, Peep Männik, Zhifei Zhang, Zhiliang Zhang
doi: https://doi.org/10.1101/486779
Leonid E Popov
Department of Earth Sciences, National Museum of Wales, Cathays Park, Cardiff CF10 3NP, UK;
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Javier J Alvaro
Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain;
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Lars E Holmer
Department of Earth Sciences, Palaeobiology, SE-752 36 Uppsala, Sweden;
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  • ORCID record for Lars E Holmer
  • For correspondence: lars.holmer@pal.uu.se
Heikki Bauert
Geological Survey of Estonia, Estonia, Tartu maantee 85, 11412 Tallinn, Estonia;
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Mansoureh Ghobadi Pour
Department of Geology, Faculty of Sciences, Golestan University, Gorgan 49138-15739, Iran;
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Andrei V Dronov
Geological Institute of Russian Academy of Sciences, 7 Pyzhevskii Lane, Moscow 119017, Russia;
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Oliver Lehnert
GeoZentrum Nordbayern, Lithosphere Dynamics, FAU Erlangen-Nurnberg, Schlosgarten 5, D-91054 Erlangen;
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Olle Hints
Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;
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Peep Männik
Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;
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Zhifei Zhang
Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeo
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Zhiliang Zhang
Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeo
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Abstract

The Tremadocian (Early Ordovician) is currently considered a time span of greenhouse conditions with tropical water surface temperature estimates, interpolated from oxygen isotopes, approaching 40°C. In the high-latitude Baltoscandian Basin, these data are in contrast with the discovery of glendonite, a pseudomorph of ikaite (CaCO3·6H2O) and valuable indicator of near-freezing bottom-water conditions. The massive precipitation of this climatically sensitive mineral is associated with transgressive conditions and high organic productivity. Surprisingly, the precipitation of glendonite is contemporaneous with the record of conodonts displaying low δ values, which would suggest high temperatures (>40°C) in the water column. Therefore, the early Tremadocian sediments of Baltoscandia contain both 'greenhouse' pelagic signals and near-freezing substrate indicators. This apparent paradox suggests both the influence of isotopically depleted freshwater yielded by fluvial systems, and the onset of sharp thermal stratification patterns in a semi-closed basin, which should have played an important role in moderating subpolar climates and reducing latitudinal gradients.

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Posted December 04, 2018.
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Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitude
Leonid E Popov, Javier J Alvaro, Lars E Holmer, Heikki Bauert, Mansoureh Ghobadi Pour, Andrei V Dronov, Oliver Lehnert, Olle Hints, Peep Männik, Zhifei Zhang, Zhiliang Zhang
bioRxiv 486779; doi: https://doi.org/10.1101/486779
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Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitude
Leonid E Popov, Javier J Alvaro, Lars E Holmer, Heikki Bauert, Mansoureh Ghobadi Pour, Andrei V Dronov, Oliver Lehnert, Olle Hints, Peep Männik, Zhifei Zhang, Zhiliang Zhang
bioRxiv 486779; doi: https://doi.org/10.1101/486779

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