Distribution of Diagenetic Alterations in Siliciclastic Shoreface Deposits within a Sequence Stratigraphic Framework: Evidence from the Upper Jurassic, Boulonnais, NW France

Al‐Ramadan, Khalid; Morad, S.; Proust, Jean-Noël; Al‐Aasm, Ihsan S.

doi:10.2110/jsr.2005.072

Cited by 105 publications

(40 citation statements)

References 49 publications

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“…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%

“…Sequence stratigraphical studies of the Wimereux section (Al-Ramadan et al, 2005;Braaksma et al, 2006;Herbin et al, 1995;Proust, 1994, 1995 allow us to relate observed variations in organic facies to changes in relative sealevel. Herbin et al (1995) pointed out that relative sea-level rise was not the single cause for OM accumulation.…”

Section: Geological Framework and Previous Resultsmentioning

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: 99%

Section: Geological Framework and Previous Resultsmentioning

confidence: 99%

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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“…Besides the dissolution of Ca-feldspars, clay mineral transformations such as illitization of smectite are also accompanied by a release of Ca 2+ and Mg 2+ into solution [12,53]. Carbonate cement (mainly Type II) would precipitate with enrichment of Ca 2+ and Mg 2+ ions and a decrease in CO 2 concentration under Fe-and Mn-reducing, suboxic to sulfate-reduction geochemical conditions [57][58][59][60]. With increasing burial depth and temperature, the decomposition of organic acid decarboxylation would be enhanced, and more clay mineral transformation would occur [12].…”

Section: Distribution Patterns Of Carbonate Cementmentioning

confidence: 99%

Origin and Distribution of Carbonate Cement in Tight Sandstones: The Upper Triassic Yanchang Formation Chang 8 Oil Layer in West Ordos Basin, China

et al. 2017

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Two generations of carbonate cement as Type I (microcrystalline calcite and dolomite) and Type II (mainly Fe-calcite and Fedolomite) are recognized in Chang 8 sandstones, Ordos basin. Carbonate cement in Chang 8 sandstones is closely related to the dissolved carbon from thermal maturation of organic matters. Carbonate cement in the loosely packed framework grains precipitated shortly after deposition, and late-stage ferroan calcite and ferroan dolomite formed with progressive burial. The early diagenetic carbonate cement is partially to completely replaced by late-stage ferroan calcite and ferroan dolomite. Carbonate cement is much more commonly observed in sand bodies adjacent to Chang 7 source rocks. With increasing distance from the Chang 7 oil layers, the carbonate cement content gradually decreases. However, some tight carbonate cemented zones also occur at the sandstone-mudstone interfaces. Dissolution of Ca-feldspars by organic acids-rich fluids, together with clay mineral transformations such as illitization of smectite, would provide Ca 2+ and Mg 2+ ions for carbonate cementation. Organic acids and CO 2 rich fluids would charge into the reservoirs with the hydrocarbons, and when the CO 2 and acids were buffered by the framework grain dissolution, carbonate cement would precipitate with a decrease in CO 2 concentration.

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“…Compared with the Early Jurassic, relatively more silcretes developed in the Late Jurassic in response to the rising global temperature. Late Jurassic silcretes have been reported in Australia, South Africa, France, Canada and Brazil (Al-Ramadan et al, 2005;Du Toit and Reed 1954;Krausse and Mello, 2010;Laity, 2009;Pierini et al, 2010;Twidale and Campbell, 1995;Wopfner, 1978). The Earth continued to warm during the Cretaceous, with average global surface temperature peaking at ~28°C in the mid-Cretaceous (Scotese, 2001;Skelton, 2003;Veizer et al, 2000;Wang et al, 2014;Bata et al, 2015).…”

Section: Jurassic To Cenozoic Silcrete Depositsmentioning

confidence: 99%

Widespread Development of Silcrete in the Cretaceous and Evolution of the Poaceae Family of Grass Plants

Bata¹

2016

ESR

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The Cretaceous period, which is considered one of the most remarkable periods in Earth's history, saw episodes of abrupt greenhouse warming and cooling. The Cretaceous was also exceptional in that it was associated with the widespread occurrence of silcrete. To demonstrate this, the present study collated records of silcrete occurrences from the Jurassic to the present and compared them with records of variation in palaeotemperature and atmospheric CO 2 levels. Quartz solubility, which is one of the key factors that controls the rate of silcrete development, was also calculated over the same period. The results demonstrate that a marked increase (approximately 100%) in quartz solubility occurred during the Cretaceous. This was found to be a direct consequence of the extreme global warmth witnessed at that time. Furthermore, this study shows that silcrete occurrences are consistent with records of palaeotemperature and that silcretes have formed mostly in regions that have experienced warm climatic conditions, with no instances found in polar regions. The Poaceae family of grass plants are known to have evolved and diversified during the Cretaceous, which coincide with the period when silica was readily available. X-ray spectra and backscattered images from SEM examination of the internal structure of a modern wild grass (which belongs to the Poaceae family of grass plants) reveals that silica is an important constituent of the grass. This suggest a possible link between evolution of the Poaceae family in the Cretaceous and the high availability of silica during the Cretaceous.

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Distribution of Diagenetic Alterations in Siliciclastic Shoreface Deposits within a Sequence Stratigraphic Framework: Evidence from the Upper Jurassic, Boulonnais, NW France

Cited by 105 publications

References 49 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

Origin and Distribution of Carbonate Cement in Tight Sandstones: The Upper Triassic Yanchang Formation Chang 8 Oil Layer in West Ordos Basin, China

Widespread Development of Silcrete in the Cretaceous and Evolution of the Poaceae Family of Grass Plants

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