Le Lias et le Dogger du sud du Bassin parisien (France) : rôle de la tectonique syn-sédimentaire et reconstitutions paléogéographiques à l'échelle de la biozone d'ammonite

Gély, Jean-Pierre; Lorenz, Jacqueline

doi:10.1016/j.geobios.2005.06.005

Cited by 11 publications

(20 citation statements)

References 14 publications

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“…The fourth sequence is also observed by Bessereau & Guillocheau (1993), Bessereau et al (1995), Gély & Lorenz (2006) (MFS in the margaritatus Zone) and Robin et al (1996). Hallam (2001) did not record this sequence.…”

Section: The Sequence Stratigraphic Modelsupporting

confidence: 65%

“…It should be noticed that other authors proposed sequence stratigraphic models for the Triassic of the SW German Basin (Vecsei & Duringer, 2003), Lower Jurassic of the Paris Basin (Bessereau & Guillocheau, 1993;Bessereau et al, 1995;Robin et al, 1996;Hallam, 2001;de Graciansky & Jacquin, 2003;Gély & Lorenz, 2006) or closer to us, the Triassic and Lower Jurassic of Belgium (Van den Bril & Swennen, 2008). These models will be compared with the present results.…”

Section: The Sequence Stratigraphic Modelmentioning

confidence: 82%

“…The HST3 encompasses the upper part of the Arlon Formation and/or the upper part of the Luxembourg Formation. The third sequence is documented by Bessereau & Guillocheau (1993), Bessereau et al (1995) (MFS in the obtusum Zone), Hallam (2001), Gély & Lorenz (2006) (MFS in the semicostatum Zone) and merged by de Graciansky et al (1998) and Van den Bril & Swennen (2008) with sequence 2.…”

Section: The Sequence Stratigraphic Modelmentioning

confidence: 86%

“…The MFS5 is positioned in the serpentinum Zone by Bessereau & Guillocheau (1993), Bessereau et al (1995) and Gély & Lorenz (2006).…”

Section: The Sequence Stratigraphic Modelmentioning

confidence: 91%

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The Hondelange Formation and the sequence stratigraphic model of Belgian Lorraine

Boulvain¹,

Belanger²

2018

Geol. Belg.

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ABSTRACT.A detailed survey of the Sinemurian-Pliensbachian Hondelange Formation in southern Belgium led to propose a new lithostratigraphic status for this unit. Important lateral variations together with a 10° angular unconformity with respect to underlying formations suggest that the Hondelange Formation is a prominent element of the transgressive prism in Belgian Lorraine. This study also offers a sequence stratigraphic model for this area with precise description and location of transgressive and maximum flooding surfaces. These results are compared with previous models. A comparison of the magnetic susceptibility data (MS) with sequence stratigraphic units shows that no special effect of the system tract nature is observed. Depositional sequences however are characterized by different mean MS values according to their general sedimentary settings.

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Section: The Sequence Stratigraphic Modelsupporting

confidence: 65%

Section: The Sequence Stratigraphic Modelmentioning

confidence: 82%

Section: The Sequence Stratigraphic Modelmentioning

confidence: 86%

“…The MFS5 is positioned in the serpentinum Zone by Bessereau & Guillocheau (1993), Bessereau et al (1995) and Gély & Lorenz (2006).…”

Section: The Sequence Stratigraphic Modelmentioning

confidence: 91%

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The Hondelange Formation and the sequence stratigraphic model of Belgian Lorraine

Boulvain¹,

Belanger²

2018

Geol. Belg.

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“…In most regions of the NW European realm, this surface has led to the absence of the latest Pliensbachian and earliest Toarcian sediments corresponding to a major sedimentary hiatus at the stage boundary (Morard et al, 2003;Hermoso et al, 2009b). The MFS of T6 occurred around the serpentinum-bifrons Zonal transition (= limit between the Early and Middle Toarcian) in the Paris Basin (Gély and Lorenz, 2006;Guillocheau et al, 2000), and can be placed at Sancerre at approximately 322 m, within the clayed facies of the Marnes à Bifrons Fm (Figs. 2 and 3).…”

Section: Second-order Cycle: the Liassic Transgressionmentioning

confidence: 99%

Black shale deposition during Toarcian super-greenhouse driven by sea level

2013

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Abstract. One of the most elusive aspects of the Toarcian oceanic anoxic event (T-OAE) is the paradox between carbon isotopes that indicate intense global primary productivity and organic carbon burial at a global scale, and the delayed expression of anoxia in Europe. During the earliest Toarcian, no black shales were deposited in the European epicontinental seaways, and most organic carbon enrichment of the sediments postdated the end of the overarching positive trend in the carbon isotopes that characterises the T-OAE. In the present study, we have attempted to establish a sequence stratigraphic framework for Early Toarcian deposits recovered from a core drilled in the Paris Basin using a combination of mineralogical (quartz and clay relative abundance) and geochemical (Si, Zr, Ti and Al) measurements. Combined with the evolution in redox sensitive elements (Fe, V and Mo), the data suggest that expression of anoxia was hampered in European epicontinental seas during most of the T-OAE (defined by the positive carbon isotope trend) due to insufficient water depth that prevented stratification of the water column. Only the first stratigraphic occurrence of black shales in Europe corresponds to the "global" event. This interval is characterised by > 10 % Total Organic Carbon (TOC) content that contains relatively low concentration of molybdenum compared to subsequent black shale horizons. Additionally, this first black shale occurrence is coeval with the record of the major negative Carbon Isotope Excursion (CIE), likely corresponding to a period of transient greenhouse intensification likely due to massive injection of carbon into the atmosphere-ocean system. As a response to enhanced weathering and riverine run-off, increased fresh water supply to the basin may have promoted the development of full anoxic conditions through haline stratification of the water column. In contrast, post T-OAE black shales during the serpentinum and bifrons Zones were restricted to epicontinental seas (higher Mo to TOC ratios) during a period of relative high sea level, and carbon isotopes returning to pre-T-OAE values. Comparing palaeoredox proxies with the inferred sequence stratigraphy for Sancerre suggests that episodes of short-term organic carbon enrichment were primarily driven by third-order sea level changes. These black shales exhibit remarkably well-expressed higher-frequency cyclicities in the oxygen availability in the water column whose nature has still to be determined through cyclostratigraphic analysis.

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Late Triassic to Early Jurassic carbon isotope chemostratigraphy and organo-facies evolution in a distal to proximal transect of the North German Basin

Ruebsam,

Franz,

Ansorge

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Throughout the Latest Triassic and the Early Jurassic, major changes in paleogeography, climate and eustatic sea-level impacted on the development of shelf depositional environments. Secular trends in environmental conditions were punctuated by transient perturbations that occurred in relation to large-scale volcanic events, such as the emplacement of the Central Atlantic Magmatic Province at the Triassic/Jurassic boundary and the Karoo–Ferrar Large Igneous Province in the early Toarcian. We here present bulk organic (HAWK programmed pyrolysis) and organic carbon isotope (δ13Corg) data for three drill cores recovering Latest Triassic and Early Jurassic strata (Rhaetian to Toarcian). Study sites are located in the northeastern part of the Central European Epicontinental Sea and were positioned along a distal–proximal transect of the North German Basin. This allows discussing the differential response of depositional settings and organo-facies toward secular and transient environmental change. Biostratigraphically anchored trends in δ13Corg values allow the precise correlation along the transect, as well as with distant sites. At all North German locations, diagnostic secular trends in δ13Corg are punctuated by transient negative carbon isotope excursions, reflecting perturbations of the global carbon cycle at the Triassic/Jurassic boundary and in the early Toarcian. Stratigraphic gaps occurred during sea-level lowstands and are most pronounced at shallow proximal sites. Programmed pyrolysis data indicate spatiotemporal organo-facies trends that on a temporal scale occurred in response to sea-level and climate trends, while spatial patterns were governed by basin morphology and paleobathymetry. Substantial marine organic matter accumulations occurred at high sea level during the Toarcian only, and were most continuous at distal sites. Graphical Abstract

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Le Lias et le Dogger du sud du Bassin parisien (France) : rôle de la tectonique syn-sédimentaire et reconstitutions paléogéographiques à l'échelle de la biozone d'ammonite

Cited by 11 publications

References 14 publications

The Hondelange Formation and the sequence stratigraphic model of Belgian Lorraine

The Hondelange Formation and the sequence stratigraphic model of Belgian Lorraine

Black shale deposition during Toarcian super-greenhouse driven by sea level

Late Triassic to Early Jurassic carbon isotope chemostratigraphy and organo-facies evolution in a distal to proximal transect of the North German Basin

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