Devonian to Carboniferous continental-scale carbonate turnover in Western Laurentia (North America): upwelling or climate cooling?
Autor: | Hedhli M; Geological Survey of Canada, 3303-33rd Street NW, Calgary, AB T2L 2A7 Canada.; Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada., Dewing K; Geological Survey of Canada, 3303-33rd Street NW, Calgary, AB T2L 2A7 Canada., Beauchamp B; Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada., Grasby SE; Geological Survey of Canada, 3303-33rd Street NW, Calgary, AB T2L 2A7 Canada.; Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada., Meyer R; Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4 Canada. |
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Jazyk: | angličtina |
Zdroj: | Facies [Facies] 2022; Vol. 68 (4), pp. 15. Date of Electronic Publication: 2022 Jul 25. |
DOI: | 10.1007/s10347-022-00653-4 |
Abstrakt: | The Devonian to Carboniferous (DC) transition coincided with a green-to-ice house climatic shift, anoxia, disappearance of lower latitude carbonate banks, and turnover from warm-to-cool water carbonate factories. In western Laurentia, the switch to carbonate factories dominated by cool-water biota was contemporaneous with a tectonically driven palaeogeographic change. To investigate this depositional shift and infer the relative impact of climate vs tectonics, a continental-scale sedimentological and geochemical study was conducted on twelve stratigraphic sections of DC strata from western Canada to southern Nevada (USA). The spatial-temporal distribution of microfacies records the turnover from [i] a Famennian lime mud-rich, shallow warm-water carbonate ramp with low sedimentation rates, mesotrophic conditions and tabular geometry to [ii] Tournaisian to Viséan lime mud-depleted and grainstone dominated cool-water carbonate ramp with anomalous high sedimentation rates, oligotrophic conditions and a pronounced slope. Positive excursions of δ 18 O Supplementary Information: The online version contains supplementary material available at 10.1007/s10347-022-00653-4. Competing Interests: Conflict of interestThe author(s) declare(s) that there is no conflict of interest regarding the publication of this article. (© Crown 2022.) |
Databáze: | MEDLINE |
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