From late Visean to Stephanian: pinpointing a two-stage basinal evolution in the Variscan belt. A case study from the Bosmoreau basin (French Massif Central) and its geodynamic implications
| العنوان: | From late Visean to Stephanian: pinpointing a two-stage basinal evolution in the Variscan belt. A case study from the Bosmoreau basin (French Massif Central) and its geodynamic implications |
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| المؤلفون: | Norbert Clauer, Henri Maluski, Olivier Bruguier, J. F. Becq-Giraudon |
| المصدر: | International Journal of Earth Sciences. 92:338-347 |
| بيانات النشر: | Springer Science and Business Media LLC, 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | Paleontology, geography, geography.geographical_feature_category, Basement (geology), Viséan, Clastic rock, General Earth and Planetary Sciences, Sedimentary rock, Extensional tectonics, Massif, Sedimentology, Siltstone, Geology |
| الوصف: | Post-convergence evolution of the Variscan belt is characterized by the development of intramontane coal-bearing basins containing volcano-sedimentary successions. In the French Massif Central, K––Ar ages on clay particles from fine-grained sediments of the Bosmoreau basin (Limousin area), help pinpoint the evolution of the basin. In the lower part of the sedimentary pile, illite in a siltstone underlying a volcanic layer previously dated at 332±4 Ma by the U––Pb method on zircon, yields a consistent K––Ar age of ca. 340 Ma. Upward in the sedimentary succession, illite yields Stephanian K––Ar ages, which can be combined to provide a mean deposition age of 296.5±3.5 Ma. The Bosmoreau basin, albeit mainly filled with Stephanian deposits, was initiated during the late Visean, i.e. ca. 30 Ma earlier than inferred from biostratigraphical constraints. During the Stephanian, the same structure was reactivated and late Visean deposits were eroded and subsequently blanketed by thick clastic sediments. These results emphasise a two-stage evolution for the Bosmoreau basin, which is closely related to extensional tectonics identified on basement country rocks, and they are used to propose a geodynamic evolution of the studied area. |
| تدمد: | 1437-3262 1437-3254 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::ad29672c2a747cb5c4d0dc2011077637 https://doi.org/10.1007/s00531-003-0321-3 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........ad29672c2a747cb5c4d0dc2011077637 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14373262 14373254 |
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