Microfossil assemblages and relative sea-level fluctuations in a lagoon at the Oxfordian/Kimmeridgian boundary (Upper Jurassic) in the eastern part of the Paris Basin

Lefort, Apolline; Lathuilière, Bernard; Carpentier, Cédric; Huault, Vincent

doi:10.1007/s10347-010-0259-4

Cited by 12 publications

(6 citation statements)

References 36 publications

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“…A sea-level fall at the scale of the medium-scale sequence SI controlled the progradation of back shoal deposits of the Calcaires blancs du Mont Rivel Member. Deposits observed in the Central Jura notably correspond to inner ramp ooids, corals, and oncoids with a cortex made of Lithocodium, which reflect well-oxygenated, well-agitated, oligotrophic conditions (Schmid and Leinfelder 1996;Dupraz and Strasser 1999;Shiraishi and Kano 2004;Lefort et al 2011;Olivier et al 2012). In the Southern Jura, the presence of oncoids devoid of photo-and oligotrophic encrusters associated with mixed photo-heterotrophic coral assemblages indicates more nutrient-rich conditions in a mid ramp setting .…”

Section: French Jura Platform Evolution and Controlling Factorsmentioning

confidence: 99%

Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains

2015

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A detailed facies analysis and interpretation of the evolution of depositional environments along a northsouth transect of the Late Oxfordian-Early Kimmeridgian French Jura carbonate platform highlights hierarchically stacked depositional sequences. The identified small-and medium-scale depositional sequences are matched with the precise cyclostratigraphic framework initially established for the Swiss Jura platform. The superimposition of a longterm (2nd order) sea-level rise with long (400 kyr) eccentricity cycles explains most of the French Jura platform architecture. During the Bimammatum and Planula zones, the climate became progressively warmer and more arid, allowing enhanced carbonate production. This resulted in a strong progradation of the French Jura platform that progressively evolved from a ramp to an oolitic rimmed shelf. A brief interval characterized by a more humid climate during the upper Bimammatum Zone caused an increase in siliciclastic and nutrient input, leading to a reduction in carbonate production and strong retrogradation of the platform. During the Platynota and lower Hypselocyclum zones, the shallow inner shelf carbonate production once more exceeded the accommodation, leading to a general aggradation of the platform. From the upper Hypselocyclum Zone, with a more humid climate, the carbonate production did not outweigh the accommodation creation and the platform evolved to a flat-topped shelf. Thus, sealevel changes and climatic conditions (temperature and humidity) are the key factors controlling the nature of the sedimentation and the depositional profile of the French Jura platform during the Late Oxfordian-Early Kimmeridgian.

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Section: French Jura Platform Evolution and Controlling Factorsmentioning

confidence: 99%

Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains

2015

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“…The platform margin was still located in the Marne Valley area. Near the Oxfordian and Kimmeridgian boundary, climatic warming (Lécuyer et al 2003;Brigaud et al 2008) allowed the growth of a new carbonate platform, expanding from Burgundy to the Ardennes (Lefort et al 2011).…”

Section: Geographical and Geological Frameworkmentioning

confidence: 99%

Origin of Micropores In Late Jurassic (Oxfordian) Micrites of the Eastern Paris Basin, France

Carpentier

Ferry

Lécuyer

et al. 2015

Journal of Sedimentary Research

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Porous micritic facies, either primary chalks or resulting from secondary destructive micritization, can constitute important hydrocarbon or water reservoirs. Characterization of reservoir properties and the understanding of factors which controlled the distribution of porosity are of primary interest to evaluate the prospective reserves. Middle and late Oxfordian limestones of the eastern Paris Basin show several horizons with porosities higher than 20%. The porosity is mainly microporous and located either within secondary micritized grains or in the micritic matrix. Using SEM, cathodoluminescence, as well as confocal microscopy, stable oxygen and carbon isotope ratios, and petrophysical measurements, a scenario for the evolution of the micropores is proposed. Lime mudstones to packstones constitute the majority of the high-porosity facies (HPFs). Inner lagoonal deposits are more micritized and thus more porous than grainstones, and facies rich in leiolitic oncoids and echinoid clasts are less impacted by micritization. Micritization was responsible for an increase of the intragranular porosity in most grain types. During both eogenesis and shallow burial, mineralogical stabilization dissolved aragonitic particles and allowed precipitation of calcite rhombs. This process was probably enhanced below surfaces of subaerial exposure. During burial, Ostwald ripening allowed the growth of larger micrite crystals at the expense of smaller ones during early Berriasian and late Aptian recharges of deep aquifers when the northern margin of the basin was exposed. Overgrowths on micrite crystals were more important in intervals strongly affected by chemical compaction, which favored oversaturation of waters with respect to calcite. In low-porosity horizons (LPFs), the dense micritic texture of oncoids and the monocrystalline architecture of echinoid clasts prevented an intense micritization, while the strong chemical compaction enhanced poronecrosis. Telogenetic fracturing created new fluid pathways that favored inputs of meteoric fluid in porous micrite and allowed the continuation of Ostwald ripening during Cenozoic times. As a whole, mesogenetic inputs of waters undersaturated with respect to calcite in deep aquifers during exposure of basin margins are a more efficient process than early subaerial exposure for enhancing aggrading neomorphism and appearance of microporous micrites. Initial mineralogical heterogeneities also impact the intensity of chemical compaction and thus the stratigraphical distribution of microporous limestones.

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“…Lowstand relative sea-level favored the increase of siliciclastic inputs at the beginning of the late Oxfordian (Carpentier et al, 2010). A major carbonate crisis occurred at the Oxfordian/Kimmeridgian transition (Lefort et al, 2011), with marl dominated sedimentation, coming next with a mixed carbonate and siliciclastic ramp environment during the Tithonian. During late Cimmerian and late Aptian, two stages of emersion associated with erosion occurred (Quesnel, 2003), as a result of both eustatic sea-level drop and distant influence of uplift of rift shoulder linked to the North Atlantic rifting (Ziegler, 1990).…”

Section: Geological Settingmentioning

confidence: 98%

Evolution of porewater composition through time in limestone aquifers: Salinity and D/H of fluid inclusion water in authigenic minerals (Jurassic of the eastern Paris Basin, France)

et al. 2015

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Past water circulations can significantly reduce the porosity and permeability of marine limestones. This is particularly the case in the Middle (Bathonian / Bajocian) to Upper (Oxfordian) Jurassic limestones from the eastern border of the Paris Basin. The knowledge of the timing, the temperature and composition of paleowaters is essential to model the hydrological evolution in this area where the Callovian-Oxfordian claystones are studied for the storage of nuclear wastes. In this way, fluid inclusions hosted in low-temperature (<60 °C) authigenic calcite, quartz and celestite crystals were analyzed by Raman spectroscopy and mass spectrometry to determine the chlorinity and D/H ratios. Chlorinity measurements (mmol Cl per liter of water) in fluid inclusions trapped in authigenic crystals during the late Jurassic / early Cretaceous period revealed unexpected high values, up to 3800 mmol•l-1 , indicating that brines were involved in some of the diagenetic crystallization processes. By contrast, fluid inclusions in calcite cements of Cenozoic age within the Oxfordian limestones have low Cl concentration (less than 150 mmol•l-1), thus showing that a dilution event caused by water infiltrations during the Cretaceous uplift of this part of the basin has flushed out the original saline porewater. By coupling D of fluid inclusion with  18 O of calcite crystals, we estimate that calcite precipitation occurred at temperatures between 25 and 53 °C. The

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Microfossil assemblages and relative sea-level fluctuations in a lagoon at the Oxfordian/Kimmeridgian boundary (Upper Jurassic) in the eastern part of the Paris Basin

Cited by 12 publications

References 36 publications

Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains

Evolution of a Late Oxfordian: early Kimmeridgian carbonate platform, French Jura Mountains

Origin of Micropores In Late Jurassic (Oxfordian) Micrites of the Eastern Paris Basin, France

Evolution of porewater composition through time in limestone aquifers: Salinity and D/H of fluid inclusion water in authigenic minerals (Jurassic of the eastern Paris Basin, France)

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