Pennsylvanian–Permian Aragonite to Calcite Sea Transitions in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain) ...
Detailed facies analysis of Carboniferous–Permian strata in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain) has led to the recognition of short-lived calcite seas within a first-order aragonite sea. The first return to calcitic conditions is documented in Lower Pennsylvanian...
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
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Science
2021
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| Online Access: | https://dx.doi.org/10.11575/prism/39019 https://prism.ucalgary.ca/handle/1880/113645 |
| Summary: | Detailed facies analysis of Carboniferous–Permian strata in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain) has led to the recognition of short-lived calcite seas within a first-order aragonite sea. The first return to calcitic conditions is documented in Lower Pennsylvanian carbonate rocks and lasted approximately 4–6 Myrs based on the replacement of aragonitic algae and tangential ooids by calcitic algae and radial ooids in shallow water facies. A second return to calcite sea immediately after the Carboniferous–Permian boundary is documented within an individual cyclothem, ~400,000 years in duration, through a similar shift to calcitic biotic and abiotic elements. These findings indicate higher-order calcite-aragonite episodes may occur during first-order oscillations and are likely influenced by a variety of mechanisms such as magnesium to calcium ratio (Mg:Ca), pCO2, temperature, and carbonate saturation among others. In this study, both the Early Pennsylvanian and Early Permian ... |
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