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Título: | Glendonite occurrences in the Tremadocian of Baltica: first Early Palaeozoic evidence of massive ikaite precipitation at temperate latitudes |
Autor: | Álvaro, J.J.; Popov, Leonid E.; Holmer, Lars E.; Bauert, H.; Ghobadi Pour, Mansoureh; Dronov, A.V.; Lehnert, Oliver; Hints, O.; Männik, P.; Zhang, Zhifei; Zhang, Zhifei | Fecha de publicación: | 2019 | Editor: | Springer Nature | Citación: | Scientific Reports 9 (2019) | Resumen: | 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 δ O 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 (CaCO ·6H O) 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 δ O-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. | Versión del editor: | http://dx.doi.org/10.1038/s41598-019-43707-4 | URI: | http://hdl.handle.net/10261/209065 | DOI: | 10.1038/s41598-019-43707-4 | Identificadores: | doi: 10.1038/s41598-019-43707-4 issn: 2045-2322 |
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