The Lutetian/Bartonian transition (middle Eocene) at the Oyambre section (northern Spain): Implications for standard chronostratigraphy

Payros, Aitor; Dinarès-Turell, Jaume; Monechi, Simonetta; Orue‐Etxebarria, Xabier; Ortíz, Silvia; Apellaniz, Estibaliz; Martínez‐Braceras, Naroa

doi:10.1016/j.palaeo.2015.09.015

Cited by 14 publications

(17 citation statements)

References 45 publications

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“…The limestone beds are noticeably thicker than intervening marls throughout the 59 couplets found in the Oyambre section (Payros et al ., ). In the interval studied herein, the limestone beds vary considerably in thickness (range: 40 to 100 cm; average: 67·5 cm), while marls are more homogeneous (range: 20 to 50 cm; average: 34·17 cm).…”

Section: Resultsmentioning

confidence: 99%

“…The gulf was flanked by shallow‐water carbonate ramps, from which sediment was episodically washed away and transported offshore by storm‐triggered sediment gravity flows, and turbiditic submarine fans were formed at the bottom of the basin, up to 1500 m deep (Pujalte et al ., ; Payros et al ., ). Previous studies on Pyrenean successions retrieved signs of global climate evolution, such as distinctive long‐term climatic trends, short‐term astronomical oscillations and episodic hyperthermal events (Dinarès‐Turell et al ., ; Payros et al ., , , ; Rodríguez‐Tovar et al ., ; Batenburg et al ., ;).…”

Section: Study Areamentioning

confidence: 99%

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Contrasting environmental effects of astronomically driven climate change on three Eocene hemipelagic successions from the Basque–Cantabrian Basin

et al. 2017

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Several processes can contribute to the formation of hemipelagic limestone–marl alternations as a consequence of astronomically driven climate change. The aim of this study was to decipher which environmental factors governed the formation of three Eocene hemipelagic successions of the Basque–Cantabrian Basin using a comprehensive set of physical and bulk carbonate geochemical data (bed thickness, mineralogy, %CaCO3, δ13C and δ18O). The results show that the significance of several environmental processes varied depending on the palaeogeographic setting and eccentricity‐modulated precessional seasonality. In the Sopelana starved deep‐sea basin, limestones were formed as a consequence of high pelagic carbonate productivity during periods of warm seawater and sluggish circulation, which corresponded with periods of low seasonality (summers at aphelion); conversely, marls accumulated when pelagic carbonate productivity decreased during periods with cooler waters and more vigorous circulation, which occurred when seasonality was higher (summers at perihelion). In the Gorrondatxe submarine fan fringe, marls accumulated when high seasonality produced significant continental rainfall and run‐off, causing the dilution of pelagic carbonate sedimentation with terrigenous supplies. In the Oyambre upper slope, marls also accumulated when seasonality was high, as pelagic carbonate productivity decreased due to both the expansion of low‐salinity waters on the ocean surface and the increase in continentally derived nutrients, which caused detrimental seawater conditions for calcareous plankton. Both in Gorrondatxe and Oyambre, limestones accumulated when boreal summer at aphelion caused low seasonality, which allowed relatively stable conditions to prevail. At minimum eccentricity, when precession‐driven seasonality contrast diminished, changes in pelagic carbonate productivity were significant in the three sections. On the contrary, at maximum eccentricity, when seasonality peaked due to summers occurring at perihelion, the effects of other environmental processes, such as continental and oceanic currents, became influential. However, the influence of these processes minimized when summertime coincided with aphelion at maximum eccentricity and seasonality was weakest.

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Section: Resultsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Contrasting environmental effects of astronomically driven climate change on three Eocene hemipelagic successions from the Basque–Cantabrian Basin

et al. 2017

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“…On a larger scale, thick massive intervals containing three to four blurred limestone-marl couplets alternate with thinner intervals composed of two prominent limestone-marl couplets. This largerscale lithological alternations define a stacking pattern of bundles with individual thicknesses of 2 to 6 m that were outlined by Payros et al (2015) (Figure 1c). Such an arrangement led Payros et al (2015) to consider that the limestone-marl couplets are the sedimentary manifestation of astronomical precession cycles of 21 kyr duration, the larger-scale bundles being the physical expression of the 100 kyr eccentricity cycles (short eccentricity).…”

Section: 1002/2017gc007367mentioning

confidence: 97%

“…Stratigraphically above, on the eastern side of the cape, the Acebosa Fm is composed of 130 m of upper Lutetian and lower Bartonian hemipelagic and turbiditic deposits accumulated on an eastward facing slope that progressively deepened from 500 to 900 m (Payros et al, 2015). Here, we focus on the lower interval Payros et al (2015). Note the original lithological bundles sketched along the lower part of the section (the red box delimits the interval studied in detail herein).…”

Section: 1002/2017gc007367mentioning

confidence: 99%

“…(b) Location map for ODP deep‐sea cores on a 45 Ma paleogeographic reconstruction in Mollweide projection (from http://www.odsn.de). (c) Synthetic lithological log of the Oyambre section, including magnetostratigraphic and calcareous nannofossil biostratigraphic results (PF, planktonic foraminifera, CN, calcareous nannofossils) as studied in Payros et al (). Note the original lithological bundles sketched along the lower part of the section (the red box delimits the interval studied in detail herein).…”

Section: Introductionmentioning

confidence: 99%

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High‐Resolution Integrated Cyclostratigraphy From the Oyambre Section (Cantabria, N Iberian Peninsula): Constraints for Orbital Tuning and Correlation of Middle Eocene Atlantic Deep‐Sea Records

Dinarès-Turell

Martínez‐Braceras

Payros

2018

Geochem Geophys Geosyst

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The astronomical timescale accuracy generally exceeds other dating methods. Precise age models are pivotal for paleoclimatic research. The middle Eocene astronomical timescale has been poorly constrained due to scarcity of suitable records leading to the so call “Eocene astronomical timescale gap.” We present magnetic susceptibility and color proxy records from an expanded 60 m long cyclic hemipelagic succession from the Oyambre Cape in northern Spain (∼1.3 My long stratigraphic section tuned to the ∼43.1–44.4 Ma interval in the Lutetian stage). We use the strong eccentricity amplitude modulation of precession in the sedimentary record for orbital tuning. The tuned record is correlated at precession level with previously tuned Ocean Drilling Program (ODP) Site 1260 from the equatorial Atlantic (the only oceanic record that registers geochemical variations in the precession band) and to other lower resolution deep‐sea records at eccentricity level from the Southern Atlantic. Our data is consistent with a very long eccentricity minimum (driven by a ∼2.4 My periodicity) at 43.15 Ma in the orbital solutions and an age for the C20n/C20r reversal boundary at ∼43.45 Ma. However, we challenge previous correlations between these Atlantic sites (shifts of one 100 ky eccentricity cycle). Data allows to rule out correlation to either younger or older 405 ky eccentricity cycles, which constrains chronologies for the middle Eocene, emphasizing the need for consistent astrochronological frameworks involving expanded outcrops. This should aid to overcome oceanic drilling shortcomings and sedimentary complexities. Our study highlights this integration need to achieve accuracy and stability of orbital timescales underpinning Eocene paleoclimatic records.

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Eocene Mass‐Transport Deposits in the Basque Basin (Western Pyrenees, Spain)

Payros

Pujalte

2019

Submarine Landslides

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The Lutetian/Bartonian transition (middle Eocene) at the Oyambre section (northern Spain): Implications for standard chronostratigraphy

Cited by 14 publications

References 45 publications

Contrasting environmental effects of astronomically driven climate change on three Eocene hemipelagic successions from the Basque–Cantabrian Basin

Contrasting environmental effects of astronomically driven climate change on three Eocene hemipelagic successions from the Basque–Cantabrian Basin

High‐Resolution Integrated Cyclostratigraphy From the Oyambre Section (Cantabria, N Iberian Peninsula): Constraints for Orbital Tuning and Correlation of Middle Eocene Atlantic Deep‐Sea Records

Eocene Mass‐Transport Deposits in the Basque Basin (Western Pyrenees, Spain)

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