globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.01.040
论文题名:
Clay mineralogical and geochemical expressions of the "Late Campanian Event" in the Aquitaine and Paris basins (France): Palaeoenvironmental implications
作者: Chenot E.; Pellenard P.; Martinez M.; Deconinck J.-F.; Amiotte-Suchet P.; Thibault N.; Bruneau L.; Cocquerez T.; Laffont R.; Pucéat E.; Robaszynski F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 447
起始页码: 42
结束页码: 52
语种: 英语
英文关键词: Campanian ; Carbon isotope stratigraphy ; Clay minerals ; Cyclostratigraphy ; Late Campanian Event
英文摘要: Campanian sediments from two French sedimentary basins were studied, using clay mineralogy and stable isotope (δ13C and δ18O) geochemistry, in order to investigate the Late Campanian Event. The clay fraction of the Campanian sediments from the Tercis-les-Bains section (Aquitaine Basin) and from the Poigny borehole (Paris Basin) is mainly composed of smectite. This background sedimentation was, however, interrupted during the Upper Campanian in the two basins by a substantial increase in detrital inputs, including illite, kaolinite, and chlorite at Tercis-les-Bains, and illite at Poigny. This detrital event, resulting from the enhanced erosion of nearby continental areas triggered by increasing runoff, has also been recognized in the Tethys and South Atlantic oceans. It coincided with a global negative carbon isotope excursion, the Late Campanian Event (LCE). Carbon isotope stratigraphy was used to correlate the two basins with previously studied sections from distant areas. Spectral analysis of the bulk δ13C from Tercis-les-Bains suggests a duration of ca. 400 kyr for a pre-LCE negative excursion and ca. 800-900 kyr for the LCE sensu stricto. The detrital event, as characterized by clay mineralogy, spans the interval that comprises the pre-LCE and the LCE, with a duration of 1.3 Myr. Intensification of continental erosion during the LCE may have resulted either from the Late Campanian polyplocum regression and/or from a regional tectonic pulse that triggered the emersion of previous submerged shelf areas and the increase of silicate erosion. As the LCE seems to be recorded at a large geographic scale, it is proposed here that enhanced chemical weathering and an associated decrease in atmospheric pCO2 levels could have contributed to the long-term Late Cretaceous cooling trend. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68531
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作者单位: Biogéosciences, UMR 6282, CNRS, University of Bourgogne Franche-Comté, 6 boulevard Gabriel, Dijon, France; MARUM, Center for Marine Environmental Sciences, Universität Bremen, Leobener Str., Bremen, Germany; IGN, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark; Faculté Polytechnique, Université de Mons, 9 rue de Houdain, Mons, Belgium; 57 rue Desmortiers, Saintes, France

Recommended Citation:
Chenot E.,Pellenard P.,Martinez M.,et al. Clay mineralogical and geochemical expressions of the "Late Campanian Event" in the Aquitaine and Paris basins (France): Palaeoenvironmental implications[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,447
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