U–Pb age constraints on the Carboniferous–Permian transition in continental basins of eastern equatorial Pangaea (France): implications for the depositional history and correlations across the late Variscan Belt

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of the Geological Society Pub Date : 2023-10-12 DOI:10.1144/jgs2023-075
Mathilde Mercuzot, Camille Rossignol, Sylvie Bourquin, Jahandar Ramezani, Céline Ducassou, Marc Poujol, Laurent Beccaletto, Pierre Pellenard
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Abstract

Intramontane late Carboniferous–Permian basins of western Europe developed during the latest orogenic stages of the Variscan Mountain Belt in eastern Pangaea, at equatorial palaeolatitudes. Their stratigraphic framework is mainly based on continental subdivisions (e.g. Stephanian and Autunian continental stages), which can be contentious owing to biostratigraphic biases, resulting in long-distance diachronous subdivisions. To provide precise inter-basinal and global correlations to the internationally recognized chronostratigraphic marine stages, this study reports new U–Pb geochronology from the Aumance and Decize–La Machine basins, located in the northern French Massif Central. Zircon grains extracted from three volcanic ash-fall layers give weighted mean 206 Pb/ 238 U ages of 299.11 ± 0.35, 298.73 ± 0.36 and 298.59 ± 0.35 Ma (2 σ total propagated uncertainty) by the chemical abrasion isotope dilution thermal ionization mass spectrometry method, coinciding with the Carboniferous–Permian transition (Gzhelian and Asselian stages). These ages imply that the northern Massif Central basins developed synchronously in relatively short periods of time (<10 myr), reflecting substantial sedimentation rates. Finally, the new chronology of infilling of these basins confirms that they were connected during the late Carboniferous and early Permian periods, improving the knowledge on the late orogenic Variscan geodynamic setting in this area. Supplementary material: Operating conditions and complete analytical results are available at https://doi.org/10.6084/m9.figshare.c.6805228
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东赤道盘古大陆盆地石炭纪-二叠纪转变的U-Pb年龄约束:对晚瓦里斯坎带沉积史和相关性的影响
西欧晚石炭世—二叠纪山内盆地发育于泛古大陆东部瓦里斯坎山带的最新造山带阶段,位于赤道古纬度。它们的地层格架主要基于大陆细分(如斯蒂芬期和奥图尼期大陆阶段),但由于生物地层偏差,这种划分可能存在争议,导致了长距离的历时细分。为了提供国际公认的海相地层年代学阶段的精确的盆地间和全球相关性,本研究报告了位于法国中部地块北部的Aumance和Decize-La Machine盆地的新的U-Pb地质年代学。利用化学磨损同位素稀释热电离质谱法,从3个火山灰落层中提取的锆石颗粒加权平均206pb / 238 U年龄分别为299.11±0.35、298.73±0.36和298.59±0.35 Ma (2 σ总传播不确定度),符合石炭-二叠纪过渡时期(Gzhelian和Asselian阶段)。这些年龄表明,北部地块中央盆地在相对较短的时间内(约10myr)同步发育,反映了可观的沉积速率。最后,新的盆地充填年代学证实了这些盆地在晚石炭世和早二叠世之间的连接,提高了对本区晚造山期Variscan地球动力学背景的认识。补充资料:操作条件和完整的分析结果可在https://doi.org/10.6084/m9.figshare.c.6805228上获得
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来源期刊
Journal of the Geological Society
Journal of the Geological Society 地学-地球科学综合
CiteScore
6.00
自引率
3.70%
发文量
68
审稿时长
6-12 weeks
期刊介绍: Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.
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