Dinokystes et milieux confinés du Paléogène du Bassin de Paris

Châteauneuf, Jean-Jacques

doi:10.3406/sgeol.1983.1640

Cited by 5 publications

(10 citation statements)

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“…Nannoplankton data show that elementary sequences #3 to #5 approximate the NP14/NP15 boundary, that is, "middle" of C21n (Molina et al, 2011) with a CENOGRID age of ∼47.0 Ma (Westerhold et al, 2020), whereas elementary sequences #21 and #22 representing NP16 (pars) and W10, respectively, can be placed within C18n.2n (Gradstein et al, 2020) and dated 40.3-39.8 Ma according to the CENOGRID timescale (Westerhold et al, 2020). The next marine units above were ascribed biostratigraphically to W11 and are <39.8 Ma (Chateauneuf & Gruas-Cavagnetto, 1978;Westerhold et al, 2020) (Figure 2). On this basis, elementary sequences #21 and #22 were ascribed to the MECO, centered at ∼40.3 Ma (Westerhold et al, 2020), while the Lutetian/Bartonian boundary is placed between elementary sequences #19 and #20 (Gély, 1996;Merle, 2008); according to the CENOGRID time-scale this boundary is positioned within magnetochron C19n and dates 41.1 Ma (Westerhold et al, 2020).…”

Section: Age Modelmentioning

confidence: 99%

“…Middle box: Biostratigraphy. 1: Distribution of Nummulites laevigatus (Merle, 2008), 2: macrofossil data (Abrard, 1925), 3: Dinoflagellates (Chateauneuf & Gruas-Cavagnetto, 1978), 4: Nannoplankton (Aubry, 1983(Aubry, , 1985. Right box: Sequence stratigraphy for PB (Haq et al, 1987(Haq et al, , 1988.…”

Section: Middle Eocene Paleogeography Paleoenvironments and Stratigra...mentioning

confidence: 99%

“…All data underlying this research have been published or are given in Table 1 of the manuscript (Abrard, 1925;Aubry, 1983Aubry, , 1985Blondeau, 1965;Briais, 2015;Cavelier & Le Calvez, 1965;Chateauneuf & Gruas-Cavagnetto, 1978;Gély, 1996;Gély & Leroux, 2019;Mégnien & Mégnien, 1980;Merle, 2008;Steurbaut & Nolf, 2021).…”

Section: Conflict Of Interestmentioning

confidence: 99%

“…Based on a re-evaluation of available biostratigraphic (Aubry, 1983(Aubry, , 1985Chateauneuf & Gruas-Cavagnetto, 1978;Steurbaut & Nolf, 2021) and sequence-and cyclostratigraphic stratigraphic data of the middle Eocene from Paris basin (PB), France (Briais, 2015;Gély, 2016;Gély & Leroux, 2019), we present the first astrochronologically calibrated sequence stratigraphic classification for shallow-water deposits. For the synchronization of this classification with astronomical solutions of long-term changes in Earth orbital parameters, we complement the biostratigraphic chronology with a diagnostic, hierarchical system of small-and large-scale sedimentary cycles.…”

Section: Approachmentioning

confidence: 99%

“…A characteristic of all of the shallow-marine to terrestrial deposits of PB is a regular, vertical stacking of shallowing upward sequences (Briais, 2015;Gély & Leroux, 2019), referred to as elementary sequences sensu Strasser (2018) that we numbered #1 to #22 (Figure 2). For the classic Lutetian of PB three separate biostratigraphic classifications have been proposed (Merle, 2008) (Figure 2): (a) a largely local system of five zones based on shallow-marine benthic macrofauna (Abrard zonation) (Abrard, 1925), (b) a classification using the first and last occurrences of dinoflagellate cysts (W-zonation) (Chateauneuf & Gruas-Cavagnetto, 1978), and (c) calcareous nannoplankton stratigraphy (NP-zonation) (Aubry, 1983(Aubry, , 1985Gradstein et al, 2020;Martini, 1971;Steurbaut & Nolf, 2021). Based on these biostratigraphic classifications, the GG, CG and Sables d'Auvers together with Sables de Beauchamps can be dated latest Ypresian to early Bartonian (Figure 2).…”

Section: Biostratigraphymentioning

confidence: 99%

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Astronomical Pacing of Middle Eocene Sea‐Level Fluctuations: Inferences From Shallow‐Water Carbonate Ramp Deposits

Brachert,

Agnini,

Gagnaison

et al. 2023

Paleoceanog and Paleoclimatol

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Astrochronologically calibrated deep‐sea records document the Cenozoic (66–0 Ma) global climatic cooling in great detail, but the magnitude of sea‐level fluctuations of the middle Eocene Warmhouse state (47.8–37.7 Ma) and the ∼40.3 Ma warming event of the Middle Eocene Climatic Optimum (MECO) is not well constrained. Here, we present a sequence stratigraphic classification of a shallow marine mixed carbonate—clastic ramp system for this time interval in Paris basin, France. Based on sedimentologic, paleogeographic and biostratigraphic data, we hypothesize that the 22 elementary sequences recognized each correspond to the long cycle of orbital eccentricity (0.405 Myr). With the exception of the MECO, the shoreline trajectory of superimposed, third‐order depositional sequences evolved in phase with the very long cycles of orbital eccentricity (2.4 Myr), suggesting significant polar ice build‐up leading to sea level lowstands during nodes of the very long eccentricity cycle. Inferred from Fischer Plot methodology, Lutetian third‐order eustasy was in the order of 5–10 m and during the MECO 30 m or more. Furthermore, the shallow‐water record implies that third order sea‐level changes were astronomically paced in the middle Eocene Warmhouse climate state, but a decoupling occurred during the transient MECO warming.

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Section: Age Modelmentioning

confidence: 99%

Section: Middle Eocene Paleogeography Paleoenvironments and Stratigra...mentioning

confidence: 99%

Section: Conflict Of Interestmentioning

confidence: 99%

Section: Approachmentioning

confidence: 99%

Section: Biostratigraphymentioning

confidence: 99%

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Astronomical Pacing of Middle Eocene Sea‐Level Fluctuations: Inferences From Shallow‐Water Carbonate Ramp Deposits

Brachert,

Agnini,

Gagnaison

et al. 2023

Paleoceanog and Paleoclimatol

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Facies distribution and depositional cycles in lacustrine and palustrine carbonates: The Lutetian–Aquitanian record in the Paris Basin

Moreau,

Andrieu,

Briais

et al. 2023

The Depositional Record

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The difficulty of correlating continental deposits hinders predicting lacustrine and palustrine carbonate facies variations in time and space. This study aims to understand better the factors governing these facies heterogeneities by measuring carbonate isotopes and conducting facies, petrographic and sequence stratigraphic analyses of the Lutetian–Aquitanian deposits of the Paris Basin, that record the transition from marine to lacustrine environments. Large‐scale correlations enabled the definition of two lacustrine–palustrine carbonate facies models. (1) The coastal lacustrine system (Bartonian to Rupelian), consists of fine‐grained brackish carbonate exhibiting episodic marine inputs during short‐term relative sea‐level maxima and evaporite sedimentation during relative sea‐level minima. Lacustrine sediments differ notably from marine ones with more negative δ13C and δ18O compositions that co‐vary and a biota adapted to low salinity conditions. In the associated palustrine environment, depositional sequences evolve upwards from micritic lacustrine deposits to nodular and then laminar calcretes. Microbial‐coated grains and rhizoliths indicate biological processes during repeated subaerial exposure phases in sub‐tropical to arid climates. (2) The inland lacustrine system (Rupelian and Aquitanian) was disconnected from the marine domain and showed evidence of microbial activity with microbial crusts and oncoidal rudstones. Facies rich in micritic intraclasts composed of palustrine and lacustrine facies indicate the reworking of already lithified sediments along the margins. In the palustrine domain, the calcrete facies are less abundant than breccias formed in‐situ by desiccation, limestones with root traces, or organic‐rich wackestones and marls. This system reflects a more temperate climate with more developed microbial structures and less exposed carbonates than the coastal lacustrine system. The southward migration of the depocentre and the transition from marine environments to (1) coastal and then (2) inland systems are controlled by uplift phases induced by Pyrenean and Alpine orogenesis. Third‐order relative sea‐level variations appear to control only short‐term cycles in coastal systems.

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Eocene-Pliocene time scale and stratigraphy of the Upper Rhine Graben (URG) and the Swiss Molasse Basin (SMB)

Berger

Reichenbacher²,

Becker

et al. 2005

Int J Earth Sci (Geol Rundsch)

108

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We present a general stratigraphic synthesis for the Upper Rhine Graben (URG) and the Swiss Molasse Basin (SMB) from Eocene to Pliocene times. The stratigraphic data were compiled both from literature and from research carried out by the authors during the past 6 years ; an index of the stratigraphically most important localitites is provided. We distinguish 14 geographical areas from the Helvetic domain in the South to the Hanau Basin in the North. For each geographical area, we give a synthesis of the biostratigraphy, lithofacies, and chronostratigraphic ranges. The relationships between this stratigraphic record and the global sea-level changes are generally disturbed by the geodynamic (e.g., subsidence) evolution of the basins. However, global sea-level changes probably affected the dynamic of transgression-regression in the URG (e.g., Middle Pechelbronn Beds and Serie Grise corresponding with sea-level rise between Ru1/Ru2 and Ru2/Ru3 sequences, respectively) as well as in the Molasse basin (regression of the UMM corresponding with the sea-level drop at the Ch1 sequence). The URGENT-project (Upper Rhine Graben evolution and neotectonics) provided an unique opportunity to carry out and present this synthesis. Discussions with scientists addressing sedimentology, tectonics, geophysics and geochemistry permitted the comparison of the sedimentary history and stratigraphy of the basin with processes controlling its geodynamic evolution. Data presented here back up the palaeogeographic reconstructions presented in a companion paper by the same authors (see Berger et al. in Int J Earth Sci 2005).

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Dinokystes et milieux confinés du Paléogène du Bassin de Paris

Cited by 5 publications

References 0 publications

Astronomical Pacing of Middle Eocene Sea‐Level Fluctuations: Inferences From Shallow‐Water Carbonate Ramp Deposits

Astronomical Pacing of Middle Eocene Sea‐Level Fluctuations: Inferences From Shallow‐Water Carbonate Ramp Deposits

Facies distribution and depositional cycles in lacustrine and palustrine carbonates: The Lutetian–Aquitanian record in the Paris Basin

Eocene-Pliocene time scale and stratigraphy of the Upper Rhine Graben (URG) and the Swiss Molasse Basin (SMB)

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