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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 (author)
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Alvaro, Javier J (author)
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- Holmer, Lars E., 1960- (author)
- 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 (author)
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- Ghobadi Pour, Mansoureh (author)
- 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 (author)
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Lehnert, Oliver (author)
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Hints, Olle (author)
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Männik, Peep (author)
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Zhang, Zhifei (author)
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Zhang, Zhiliang (author)
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(creator_code:org_t)
- 2019-05-10
- 2019
- English.
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 9
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Earth Science with specialization in Historical Geology and Palaeontology
- Geovetenskap med inriktning mot historisk geologi och paleontologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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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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show more...
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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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
- Articles in the publication
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Scientific Repor ...
- By the university
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Uppsala University