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Glendonite occurren...
Glendonite occurrences in the Tremadocian of Baltica : first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitude
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Popov, Leonid E (författare)
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Alvaro, Javier J (författare)
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- Holmer, Lars E., 1960- (författare)
- Uppsala universitet,Paleobiologi,Shaanxi Key laboratory of Early Life and Environments, State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi’an, China
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Bauert, Heikki (författare)
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- Ghobadi Pour, Mansoureh (författare)
- Uppsala universitet,Paleobiologi,Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran; Department of Earth Sciences, National Museum of Wales, UK
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Dronov, Andrei V (författare)
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Lehnert, Oliver (författare)
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Hints, Olle (författare)
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Männik, Peep (författare)
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Zhang, Zhifei (författare)
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Zhang, Zhiliang (författare)
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(creator_code:org_t)
- 2019-05-10
- 2019
- Engelska.
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 9
- Relaterad länk:
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https://doi.org/10.1...
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http://10.1101/48677...
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https://uu.diva-port... (primary) (Raw object)
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https://uu.diva-port...
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https://www.nature.c...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- 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 mid-latitude Baltoscandian Basin, conodonts displaying low δ18O values, which suggest high temperatures (>40 °C) in the water column, are in contrast with the discovery of contemporaneous glendonite clusters, a pseudomorph of ikaite (CaCO3·6H2O) traditionally considered as indicator of near-freezing bottom-water conditions. The massive precipitation of this temperature sensitive mineral is associated with transgressive conditions and high organic productivity. As a result, the lower Tremadocian sediments of Baltoscandia apparently contain both "greenhouse" pelagic signals and near-freezing substrate indicators. This paradox points to other primary controlling mechanisms for ikaite precipitation in kerogenous substrates, such as carbonate alkalinity, pH and Mg/Ca ratios, as recently constrained by laboratory experiments. Preservation of "hot" conodonts embedded in kerogenous shales rich in δ18O-depleted glendonites suggests both the onset of sharp thermal stratification patterns in a semi-closed basin and the assumed influence of isotopically depleted freshwater yielded by fluvial systems.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Earth Science with specialization in Historical Geology and Palaeontology
- Geovetenskap med inriktning mot historisk geologi och paleontologi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Popov, Leonid E
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Alvaro, Javier J
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Holmer, Lars E., ...
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Bauert, Heikki
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Ghobadi Pour, Ma ...
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Dronov, Andrei V
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visa fler...
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Lehnert, Oliver
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Hints, Olle
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Männik, Peep
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Zhang, Zhifei
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Zhang, Zhiliang
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visa färre...
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- NATURVETENSKAP
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Uppsala universitet