Fluvio-deltaic record of increased sediment transport during the Middle Eocene Climatic Optimum (MECO), Southern Pyrenees, Spain
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Published:2023-03-08
Issue:3
Volume:19
Page:533-554
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Peris Cabré SabíORCID, Valero LuisORCID, Spangenberg Jorge E.ORCID, Vinyoles Andreu, Verité Jean, Adatte ThierryORCID, Tremblin Maxime, Watkins Stephen, Sharma NikhilORCID, Garcés MiguelORCID, Puigdefàbregas Cai, Castelltort SébastienORCID
Abstract
Abstract. The early Cenozoic marine sedimentary record is punctuated by several brief episodes (<200 kyr) of abrupt global warming, called hyperthermals, that have disturbed ocean life and water physicochemistry. Moreover, recent studies of fluvial–deltaic systems, for instance at the Palaeocene–Eocene Thermal Maximum, revealed that these hyperthermals also impacted the hydrologic cycle, triggering an increase in erosion and sediment transport at the Earth's surface. Contrary to the early Cenozoic hyperthermals, the Middle Eocene Climatic Optimum (MECO), lasting from 40.5 to 40.0 Ma, constitutes an event of gradual warming that left a highly variable carbon isotope signature and for which little data exist about its impact on Earth surface systems. In the South Pyrenean foreland basin (SPFB), an episode of prominent deltaic progradation (Belsué–Atarés and Escanilla formations) in the middle Bartonian has been usually associated with increased Pyrenean tectonic activity, but recent magnetostratigraphic data suggest a possible coincidence between the progradation and the MECO warming period. To test this hypothesis, we measured the stable-isotope composition of carbonates (δ13Ccarb
and δ18Ocarb) and organic matter (δ13Corg) of 257 samples in two sections of SPFB fluvial–deltaic successions covering the different phases of the MECO and already dated with magnetostratigraphy. We find a negative shift in δ18Ocarb and an unclear signal in
δ13Ccarb around the transition from magnetic chron C18r to chron C17r (middle Bartonian). These results allow, by correlation with reference sections in the Atlantic and Tethys, the MECO to be identified and its coincident relationship with the Belsué–Atarès fluvial–deltaic progradation to be documented. Despite its long duration and a more gradual temperature rise, the MECO in the South Pyrenean foreland basin may have led, like lower Cenozoic hyperthermals, to an increase in erosion and sediment transport that is manifested in the sedimentary record. The new data support the hypothesis of a more important hydrological response to the MECO than previously thought in mid-latitude environments, including those around the Tethys.
Funder
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
Reference109 articles.
1. Adatte, T., Stinnesbeck, W., and Keller, G.: Lithostratigraphic and mineralogic correlations of near K/T boundary clastic sediments in northeastern Mexico: Implications for origin and nature of deposition, Special Paper 307: The Cretaceous-Tertiary Event and Other Catastrophes in Earth History, Geological Society of America, 211–226, https://doi.org/10.1130/0-8137-2307-8.211, 1996. 2. Adatte, T., Bolle, M. P., Kaenel, E. D., Gawenda, P., Winkler, W., and Von Salis, K.: Climatic evolution from Paleocene to earliest Eocene inferred
from clay-minerals: A transect from northern Spain (Zumaya) to southern
(Spain, Tunisia) and southeastern Tethys margins (Israel, Negev), inL: Vol. 122, Taylor & Francis, 7–8, https://doi.org/10.1080/11035890001221007, 2000. 3. Arimoto, J., Nishi, H., Kuroyanagi, A., Takashima, R., Matsui, H., and Ikehara, M.: Changes in upper ocean hydrography and productivity across the
Middle Eocene Climatic Optimum: Local insights and global implications from
the Northwest Atlantic, Global Planet. Change, 193, 103258, https://doi.org/10.1016/j.gloplacha.2020.103258, 2020. 4. Baatsen, M., von der Heydt, A. S., Huber, M., Kliphuis, M. A., Bijl, P. K., Sluijs, A., and Dijkstra, H. A.: The middle to late Eocene greenhouse climate modelled using the CESM 1.0.5, Clim. Past, 16, 2573–2597, https://doi.org/10.5194/cp-16-2573-2020, 2020. 5. Beamud, E., Garcés, M., Cabrera, L., Muñoz, J. A., and Almar, Y.: A
new middle to late Eocene continental chronostratigraphy from NE Spain, Earth Planet. Sc. Lett., 216, 501–514, https://doi.org/10.1016/S0012-821X(03)00539-9, 2003.
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