Donnees nouvelles sur le Thanetien superieur du Nord du Bassin de Paris; La limite Paleocene-Eocene dans les bassins nordiques et sa correlation avec les bassins mesogeens

Pomerol, B.; Renard, Marc; Riveline, Janine

doi:10.2113/gssgfbull.s7-xix.1.155

Cited by 7 publications

(5 citation statements)

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“…The Paris Basin, a prominent intracratonic basin, encompasses approximately 3 km of sedimentary deposits spanning from the Triassic to the present. These deposits overlie the Variscan suture zones, a significant geological feature from the Upper Paleozoic era, as documented in several studies (Figure 1a; Curnelle & Dubois, 1986; Delmas et al., 2002; Megnien, 1980; Pomerol, 1978). The basin is geographically bounded by four Paleozoic massifs: the Armorican Massif to the south, the Bresse Graben to the southeast, the Vosges Massif to the east, and the Ardennes Massif to the north.…”

Section: Geological Contextsupporting

confidence: 62%

Characterizing Natural Hydrogen Occurrences in the Paris Basin From Historical Drilling Records

Lefeuvre,

Thomas,

Truche

et al. 2024

Geochem Geophys Geosyst

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This study investigates natural hydrogen (H2) occurrences in the Paris Basin, using Optical Character Recognition (OCR) technology to analyze an extensive, yet underexploited, database that contains historic drilling records. The potential of natural hydrogen has been largely unexplored in conventional oil and gas wells. Utilizing the in‐house CVAGeoDB database based on public well data, which includes well logs, mudlogs, and End Drilling Reports (EDRs) in PDF image format, we applied the Tesseract‐OCR Engine to convert these documents into searchable formats for efficient data analysis. Our analysis revealed several H2‐bearing wells across French sedimentary basins. The hydrogen occurrences in the Aquitaine Basin may be explained by the geological context and in particular the presence of a mantle body at shallow depth. On the contrary, the detection of H2 in the Paris Basin cannot be explained in a straightforward manner as the presence of ultramafic or U‐rich rocks is poorly documented so far. In the Paris Basin, H2 has been detected in four main formations: the Lusitanian, the Dogger, and Triassic aquifers as well as in the basement. The highest hydrogen concentration (52 vol%) was measured in the Dogger aquifer. These wells are primarily located along the Bray Fault, indicating at least a structural influence on H2 distribution. Finaly, the presence of serpentinzed dunite from the Lizard complex associated with the bedrock may have played the role as a source for H2. This research demonstrates the effectiveness of OCR in reassessing historical drilling data for natural hydrogen exploration, highlighting the need for comprehensive exploration methodologies in this emerging field.

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Section: Geological Contextsupporting

confidence: 62%

Characterizing Natural Hydrogen Occurrences in the Paris Basin From Historical Drilling Records

Lefeuvre,

Thomas,

Truche

et al. 2024

Geochem Geophys Geosyst

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“…The Seine valley is located within the Paris basin, an intracratonic sedimentary basin (Pomerol 1978;Mégnien 1980) bounded by the Ardennes, Morvan, Vosges, Massif Central and Armorican crystalline massifs. During Mesozoic times, the basin was affected by slow subsidence, which stopped during the Palaeogene and the Pyrenean orogeny.…”

Section: Geomorphic Settingsmentioning

confidence: 99%

Incision and rock uplift along the Lower Seine River since Marine Isotope Stage 8

Chourio‐Camacho,

Grimaud,

Tissoux

et al. 2024

J Quaternary Science

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The study of alluvial terraces helps in reconstructing the past geometries of rivers and makes it possible to assess the rate and pattern of fluvial incision and bedrock uplift. The fluctuations of river base levels are particularly variable and complex during the Late Quaternary in the lower course of rivers due to the interplay of responses to sea‐level fluctuations, tectonics and glacio‐isostasy. In this paper, the geometry and chronology of Manoir Brésil, an outcrop of alluvial terraces of the Lower Seine River, northern France, are investigated through a multidisciplinary study. Fluvial incision during MIS 8 in the Lower Seine in relation to sea‐level drop is recorded by an erosional surface cut into the chalk bedrock. This surface is covered by MIS 7 tidal deposits and then by younger, mostly periglacial colluvium (head). Manoir Brésil is therefore considered to be a chronological equivalent of the nearby, well‐studied Tourville‐la‐Rivière outcrop. The deposits are affected by post‐MIS 7 cryoturbation processes. Based on the local elevation of MIS 7 tidal deposits and erosional surfaces at Manoir Brésil, a minimum bedrock uplift rate of 25–40 m/Ma and an erosion rate of 125 m/Ma during glacial periods can be proposed. A regional correlation of the MIS 8 erosional surface is increasingly deformed by uplift towards the North, making it difficult to correlate the fluvial deposits along the Seine without precise chronological control. We interpret this regional tilt as the result of isostasy rebound after glaciations, consistent with the distribution of the elevations of MIS 5e and MIS 7 marine deposits along the English Channel.

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“…The Mortemer Fm is a fine limestone with oysters near its base, evolving toward a micritic limestone with high proportion of ostracods and some charophytes. It was deposited in laguno-lacustrine environment with temporary communications with the sea (Pomerol et al, 1977;Gély and Lorenz, 1991).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Significance of shallow-marine and non-marine algae stable isotope (δ18O) compositions over long periods: Example from the Palaeogene of the Paris Basin

Huyghe

Emmanuel

Renard

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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In this study, we test the potentiality of using dasycladales and charophytes, calcareous shallow-marine and non-marine algae respectively as palaeoclimatic recorders. These algae mineralize their carbonate during short periods in summer. Throughout the Palaeogene, we compare the  18 O variation of these two taxa to identify a possible common factor influencing their isotopic composition, i.e. temperatures variations, from a local environmental signal. We sampled and isotopically analyzed eight species of charophytes and seven species of dasycladales from 23 formations ranging from the Palaeocene to the Oligocene series of the Paris Basin. By comparing the  18 O of these two groups living in different environment with that of shallow-marine mollusks from a previous study, we show that temperature variations are the main factor influencing their  18 O compositions and that local environmental effects does not screen the global thermal signal. Maximum annual palaeotemperatures are calculated from the  18 O of the dasycladales and indicate by comparison with the data from mollusks previously analyzed that dasycladales species used probably mineralized their carbonate in equilibrium with seawater. Dasycladales recorded the global climatic events already known for the Palaeogene, with high temperatures reached during the Early Eocene and Middle Eocene climatic optimums and relative cooling intervals during the Lutetian, the Priabonian and the Rupelian. Charophyte gyrogonites also recorded temperature variations in their  18 O compositions but reconstituting reliable temperature values in non-marine environments is not directly possible and requires constraining  18 O of local continental water using other proxies. These promising results show that carbonates mineralized from algae constitute a reliable support for palaeoclimatic information and should be more widely used in the fossil record.

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Donnees nouvelles sur le Thanetien superieur du Nord du Bassin de Paris; La limite Paleocene-Eocene dans les bassins nordiques et sa correlation avec les bassins mesogeens

Cited by 7 publications

References 0 publications

Characterizing Natural Hydrogen Occurrences in the Paris Basin From Historical Drilling Records

Characterizing Natural Hydrogen Occurrences in the Paris Basin From Historical Drilling Records

Incision and rock uplift along the Lower Seine River since Marine Isotope Stage 8

Significance of shallow-marine and non-marine algae stable isotope (δ18O) compositions over long periods: Example from the Palaeogene of the Paris Basin

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