Sequence analytical approach to the upper Kimmeridgian-lower tithonian storm-dominated ramp deposits of the Boulonnais (Northern France). A landward time-equivalent to offshore marine source rocks

Proust, Jean-Noël; Deconinck, Jean‐François; Geyssant, Jacques; Herbin, J. P.; Vidier, Jean-Pierre

doi:10.1007/bf00260439

Cited by 19 publications

(46 citation statements)

References 37 publications

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“…represent a low-energy shelf facies deposited below wave base, but revealing some storm influence with some shelly limestone beds (Fürsich and Oschmann, 1986) and thin sandstone bodies showing hummocky cross stratifications. Like the more distal time equivalent shales and mudstones exposed at Kimmeridge on the Dorset coast (Cox and Gallois, 1981;Waterhouse, 1999) or Yorkshire (Ramanampisoa et al, 1992), these sediments are also organic-rich in part Dunn, 1972;Geyssant et al, 1993;Herbin and Geyssant, 1993;Herbin et al, 1991;1995;Proust, 1994;Proust et al, 1993), but their OM has a more mixed origin (El Albani et al, 1993;Herbin and Geyssant, 1993;Herbin et al, 1995). The higher pyrite contents, and the depauperate in situ macro and microbenthos and reduced bioturbation have long been used to suggest reducing and "stagnant", but not persistently anoxic, conditions Wallace, 1966, 1970;Barnard and Shipp, 1981).…”

Section: Geological Framework and Previous Resultsmentioning

confidence: 92%

“…1). Extensive studies of the Boulonnais sections have provided a depositional and sequence stratigraphical framework that may be used to help interpret variations in OM content and composition, in response to fluctuating relative sea-level (e.g., Al-Ramadan et al, 2005;El Albani et al, 1993;Bialkowski et al, 2000;Braaksma et al, 2006;Herbin et al, 1995;Proust et al, 1995;Schlirf, 2003;Tribovillard et al, 2001;Wignall and Newton, 2001;Williams et al, 2001). The most-studied section is exposed at the Cap de la Crèche, between Wimereux and Boulogne-sur-mer (Fig.…”

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

“…As detailed descriptions of the lithofacies and stratigraphy of the "reference" section of the Cap de la Crèche have been given previously in Proust (1994), Proust et al (1995), Herbin et al (1995), and Wignall and Newton (2001), only a summary needs be offered here. The Grès de Châtillon consists of brown-to orange-colored sandstones and sandy marlstones with common cross-bedding and wave ripples, and intense bioturbation (especially U-shaped and rhizocorallium, ophiomorpha and thallasinoides burrows).…”

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

“…The formation recorded an initial sea-level rise followed by a gradual sea-level fall Proust, 1994;Proust et al, 1993Proust et al, , 1995. The sea-level fall was accompanied by the release of smectite from the emerged part of the London-Brabant Massif.…”

Section: Smectite Abundance and Relative Sea-level Variationsmentioning

confidence: 99%

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Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Hatem¹,

Tribovillard²,

Averbuch³

et al. 2017

Bull. Soc. géol. Fr.

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-We studied a potential petroleum source rock deposited in a clastic-dominated ramp environment: the Argiles de Châtillon Formation (Kimmeridgian-Tithonian, Boulonnais area, northern France). The formation was deposited along a proximal-distal gradient on this ramp affected by synsedimentary fault movements. A sedimentological, mineralogical and geochemical study was conducted to decipher the distribution patterns of sedimentary parameters along such a depth increase over the ramp. It comes out that smectite distribution unexpectedly mimics the lateral depth evolution despite the good floatability of the mineral. It is also observed that the Argiles de Châtillon could accumulate noticeable amounts of organic matter in spite of paleoenvironmental conditions that were not specifically prone to organic matter preservation and burial (sedimentation rate, mineral particle grain size, productivity, oxygenation level...). Conversely, reactive iron, when being present in limited abundance, must have allowed sulfide ions to react with organic molecules instead of forming iron sulfides, which fostered organic matter preservation and accumulation. This protecting role of organic sulfide incorporation (additional to other favorable factors) cannot exist if reactive iron is relatively abundant. Lastly, our results (still fragmentary) suggest that smectite minerals could carry reactive iron, which would have occasionally hampered organic-matter preservation.Keywords: Kimmeridgian-Tithonian / Boulonnais / organic matter / petroleum source rocks / geochemistry / clay minerals Résumé -Importance des variations latérales discrètes dans les apports détritiques, observées dans des faciès de rampe sédimentaire riches en matière organique (Jurassique supérieur du Boulonnais). La formation des Argiles de Châtillon (Kimméridgien-Tithonien, Boulonnais) est un bon analogue géologique de roche mère pétrolière déposée en contexte de rampe clastique. Ces dépôts se sont mis en place le long d'un transect proximal-distal sur une rampe affectée par des mouvements tectoniques synsédimentaires. Pour mettre en évidence et comprendre la distribution des paramètres sédimentaires en fonction de l'évolution de la profondeur, une étude sédimentologique, minéralogique et géochimique fut entreprise. Il en ressort que la distribution de la smectite au sein du cortège argileux respecte ce gradient, malgré la flottabilité reconnue de ce minéral. Il apparaît également que les Argiles de Châtillon ont pu accumuler des quantités sensibles de matière organique malgré un contexte de dépôt peu favorable à la préservation et à l'enfouissement de celle-ci. En revanche, le fer réactif, quand il était présent en faible quantité dans les sédiments, a pu permettre aux ions sulfures de réagir avec les molécules organiques, plutôt que de former des sulfures de fer. Cette sulfuration a pu accroître la résistance de la matière organique à la dégradation microbienne, ce qui explique la bonne préservation du carbone organique. Ce rôle protecteur de la vulcanisation...

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Section: Geological Framework and Previous Resultsmentioning

confidence: 92%

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

Section: Smectite Abundance and Relative Sea-level Variationsmentioning

confidence: 99%

See 2 more Smart Citations

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Hatem¹,

Tribovillard²,

Averbuch³

et al. 2017

Bull. Soc. géol. Fr.

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“…Sequence boundaries correspond to abrupt increases in quartz content, transgressive surfaces, to abrupt decreases, and maximum-flooding surfaces coincide with the interval of finest grain sizes. Even if the sequencestratigraphic interpretation for the Kimmeridge Clay Formation produced by Williams et al (2001) shows subtle difference from previous studies (Wignall 1991;Coe 1992;Partington et al 1993;Melnyk et al 1994;Ahmadi 1997;Taylor et al 2001), there are no significant differences between the sequence-stratigraphic interpretation realised by Williams et al (2001) for the Boulonnais succession and that made by Wignall (1991) and Proust et al (1995). So, the sequence stratigraphic interpretation realised by Williams et al (2001) for the Kimmeridge Clay Formation and the Boulonnais succession is solid.…”

Section: Quartz Content Variations In the Cras D'hermont And Roche Dementioning

confidence: 76%

Tethyan-to-boreal correlation in the Kimmeridgian using high-resolution sequence stratigraphy (Vocontian Basin, Swiss Jura, Boulonnais, Dorset)

Colombié

Rameil

2006

Int J Earth Sci (Geol Rundsch)

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Ammonite biostratigraphy plays a central role in the definition of Jurassic stratigraphy. Nevertheless, the strong provincialism of European ammonite species during the Kimmeridgian is a longstanding problem in correlation attempts between the boreal and Tethyan faunal realms. Moreover, the sequence-stratigraphic interpretations for northern and southern Europe given in the Jurassic chronostratigraphic chart of Hardenbol et al. in SEPM Publ. 60 (chart) (1998) are different. The present study aims to resolve this correlation problem in order to better understand the connections between the boreal and the Tethyan realms during the Kimmeridgian. A sedimentological and high-resolution sequence-stratigraphic interpretation is presented for two unpublished sections (Cras d'Hermont and Roche de Mars) in the northern Swiss Jura, where recently discovered ammonites display both boreal and Tethyan influences. Then, these sections are correlated with the same time interval in the central Swiss Jura and Vocontian Basin, which belong to the Tethyan realm. Lastly, a longdistance transect is constructed between the Vocontian Basin, Swiss Jura, northern France, and southern England, the last two areas being part of the sub-boreal realm. The main results of this work are that: (1) thirdorder depositional sequences, and also higher-frequency sequences, can be correlated from the Tethyan to the boreal realm; (2) the sequence-stratigraphic interpretation given by Hardenbol et al. in SEPM Publ 60 (chart) (1998) for northern Europe seems to be accurate and agrees with the sequence-stratigraphic framework established in the Swiss Jura; (3) the Late Kimmeridgian of the Swiss Jura displays boreal influences; (4) integrated high-resolution sequence-stratigraphic and cyclostratigraphic studies are a valuable approach for bridging the correlation gap between northern and southern Europe.

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Transfer of germanium to marine sediments: Insights from its accumulation in radiolarites and authigenic capture under reducing conditions. Some examples through geological ages

et al. 2011

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In the geosphere, germanium (Ge) has a chemical behavior close to that of silicon (Si), and Ge commonly substitutes for Si (in small proportions) in silicates. Studying the evolution of the respective proportions of Ge and Si through time allows us to better constrain the global Si cycle. The marine inventory of Ge present as dissolved germanic acid is facing two main sinks known through the study of present sediments: 1) incorporation into diatom frustules and transfer to sediments by these "shuttles", 2) capture of Ge released to pore water through frustule dissolution by authigenic mineral phases forming within reducing sediments. Our goals are to determine whether such a bioinduced transfer of Ge is also achieved by radiolarian and whether Ge could be trapped directly from seawater into authigenic phases with no intervention of opal-secreting organisms (shuttles). To this end, we studied two Paleozoic radiolarite formations and geological formations dated of Devonian, Jurassic and Cretaceous, deposited under more or less drastic redox conditions. Our results show that the Ge/Si values observed for these radiolarites are close to (slightly above) those measured from modern diatoms and sponges. In addition, our results confirm what is observed with some present-day reducing sediments: the ancient sediments that underwent reducing depositional conditions are authigenically enriched in Ge. Furthermore, it is probable that at least a part of the authigenic Ge came directly from seawater. The recurrence and extent (through time and space) of anoxic conditions affecting sea bottoms have been quite important through the geological times; consequently, the capture of Ge by reducing sediments must have impacted Ge distribution and in turn, the evolution of the seawater Ge/Si ratio.

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Sequence analytical approach to the upper Kimmeridgian-lower tithonian storm-dominated ramp deposits of the Boulonnais (Northern France). A landward time-equivalent to offshore marine source rocks

Cited by 19 publications

References 37 publications

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Small-scaled lateral variations of an organic-rich formation in a ramp-type depositional environment (the Late Jurassic of the Boulonnais, France): impact of the clastic supply

Tethyan-to-boreal correlation in the Kimmeridgian using high-resolution sequence stratigraphy (Vocontian Basin, Swiss Jura, Boulonnais, Dorset)

Transfer of germanium to marine sediments: Insights from its accumulation in radiolarites and authigenic capture under reducing conditions. Some examples through geological ages

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