Decoupling of P- and Corg-burial following Early Cretaceous (Valanginian–Hauterivian) platform drowning along the NW Tethyan margin

Schootbrugge, Bas van de; Kuhn, Olivier; Adatte, Thierry; Steinmann, Philipp; Föllmi, Karl B.

doi:10.1016/s0031-0182(03)00540-6

Cited by 46 publications

(24 citation statements)

References 35 publications

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“…The good overall correlation between the PAR trend calculated for the four sections, as well as with the PAR trend given by Fö llmi (1995) and van de Schootbrugge et al (2003), suggests that the evolution in PAR during the late Hauterivian and the Barremian is similar over wide areas within the western Tethys (Fig. 7).…”

Section: Comparison Of the Par Curves Between The Four Sectionssupporting

confidence: 71%

“…For this period and for the Early Cretaceous in general, only a limited amount of data has been obtained with regards to its phosphorus (P) record (Fö llmi, 1995;1996;van de Schootbrugge et al, 2003). P is an important and often limiting biophile element (Broecker and Peng, 1982;Ingall and Jahnke, 1994;Tyrrell, 1999) that is closely linked to the carbon (C) cycle through two interfaces: (1) biogeochemical weathering during which atmospheric CO 2 is transformed into HCO 3 À and P is mobilized; and (2) photosynthesis, which is often limited by P and by which CO 2 is transformed into organic C (e.g., Fö llmi et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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The late Hauterivian Faraoni oceanic anoxic event in the western Tethys: Evidence from phosphorus burial rates

Bodin

Godet

Föllmi

et al. 2006

Palaeogeography, Palaeoclimatology, Palaeoecology

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In the uppermost Hauterivian sediments of the western Tethys, a short-lived anoxic event (Faraoni event) is documented both in the form of an interval enriched in organic matter (pelagic realm) and in a condensed interval enriched in glauconite and phosphate (shelf realm). This latter interval represents the onset of a drowning episode on the Helvetic carbonate platform along the northern tethyan margin that lasted throughout the early Barremian. This drowning episode marks a turning point in the way the platform carbonate factory functioned: during the Hauterivian carbonate production was dominated by heterozoans, whereas during the late Barremian a photozoan assemblage developed that is preserved in the so-called Urgonian limestone. The late Hauterivian Faraoni oceanic anoxic event is of particular interest because it is not accompanied by a major positive shift in y 13 C unlike other oceanic anoxic events during the Cretaceous (Valanginian, early Aptian, Cenomanian-Turonian boundary).We have analyzed four (hemi-)pelagic sections with regards to their phosphorus content to better understand the palaeoceanographic conditions related to this anoxic event and the associated changes in the shallow-water carbonate factory. The sections are located in Angles (SE France), Fiume-Bosso and Gorgo a Cerbara (central Italy), and Veveyse de Châtel-St. Denis (west Switzerland). We calculated phosphorus mass accumulation rates by using a cyclostratigraphic approach in order to obtain an adequate age model. We observe a comparable and correlatable long-term trend for the four sections, which suggests that the phosphorus mass accumulation rates and temporal changes therein are representative for the western tethyan pelagic realm. The Faraoni event is marked by a minimum in phosphorus accumulation and a positive shift in the C org /P tot ratios, which is interpreted as a reflection of the decreased capacity of storing and preserving phosphorus in oxygen-depleted sediments. Moreover, the onset in the decrease in phosphorus accumulation coincides with a sea level rise, while the Faraoni level itself corresponds to a maximum flooding interval. This phase of sea-level rise may have been important in the establishment of marine connections between the boreal and tethyan realms and, as such, in the exchange of nutrient-enriched waters. The model for the origin of the Faraoni oceanic anoxic event proposed here incorporates these aspects together with a positive feedback loop generated by phosphorus regeneration and a negative feedback loop related to changes in the ocean oxygen cycle.The subsequent long-term changes in phosphorus burial rates during the Barremian suggest that the Faraoni event marks the onset of a long period of environmental instability with regards to platform growth, leading to periodic phases of eutrophication * Corresponding author. Tel.: +41 32 718 26 05; fax: +41 32 718 26 01.E-mail address: stephane.bodin@unine.ch (S. Bodin).and drowning of the northern tethyan carbonate platform. This environmental cr...

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Section: Comparison Of the Par Curves Between The Four Sectionssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

The late Hauterivian Faraoni oceanic anoxic event in the western Tethys: Evidence from phosphorus burial rates

Bodin

Godet

Föllmi

et al. 2006

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…8). The absence of kaolinite and the dominance of smectite in most of the Hauterivian sediments may reflect a true climatic signal, which is in agreement with the type of carbonate platform that developed at that time, under high nutrient conditions (e.g., van de Schootbrugge et al, 2003;Bodin et al, 2006a). During the latest Hauterivian, the appearance of kaolinite indicates a change from a seasonally contrasted towards a more humid and warm (intertropical) climate that can be linked to an acceleration of the hydrologic cycle, and with that an increase in continental run-off.…”

supporting

confidence: 66%

“…As data for the upper part of Eclé pens (Blanc-Aletru, 1995), Cluses (Wermeille, 1996), Vergons and La Charce (van de Schootbrugge, 2001) sections were obtained using the methods described by Kü bler (1987) and Adatte et al (1996), the same procedures were performed on samples from Angles, Combe-Lambert and the lower part of Eclé pens. This allowed us to better compare the integrity of the dataset and to avoid discrepancies due to the process of quantification.…”

Section: Xrd Analysismentioning

confidence: 99%

Platform-induced clay-mineral fractionation along a northern Tethyan basin-platform transect: implications for the interpretation of Early Cretaceous climate change (Late Hauterivian-Early Aptian)

Godet

Bodin

Adatte

et al. 2008

Cretaceous Research

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Kaolinite Climate change Early Cretaceous Carbonate platform Jura Mountains Vocontian Trough a b s t r a c tHigh-resolution clay-mineral analyses were performed on upper Hauterivian to lower Aptian sediments along a platform-to-basin transect through the northern Tethyan margin from the Neuchâtel area (Switzerland), to the Vocontian Trough (France) in order to investigate links between climate change, carbonate platform evolution, and fractionation patterns in clay minerals during their transport. During the Hauterivian, the northern Tethyan carbonate platform developed in a heterozoan mode, and the associated ramp-like topography facilitated the export of detrital material into the adjacent basin, where clay-mineral assemblages are dominated by smectite and kaolinite is almost absent, thereby suggesting dry-seasonal conditions. During the Late Hauterivian Balearites balearis ammonite zone, a change to a more humid climate is documented by the appearance of kaolinite, which reaches up to 30% of the clay fraction in sediments in the Vocontian Trough. This prominent change just preceded the Faraoni Oceanic Anoxic Event and the onset of the demise of the Helvetic Carbonate Platform, which lasted to the late early Barremian. From the Late Barremian onwards, the renewed growth of the northern Tethyan carbonate platform in a photozoan mode and the associated development of a marginally confined platform topography fractionated the clay-mineral assemblages exported into hemipelagic settings: kaolinite particles were preferentially retained in proximal, platform settings, due to their size and their relatively high specific weight. In the inner platform environment preserved in the Swiss Jura, an average of 32% of kaolinite in the clay fraction is observed during the latest Barremian-earliest Aptian, whereas clay-mineral assemblages of coeval sediments from deeper depositional settings are dominated by smectite and show only minor amounts of kaolinite. This signifies that besides palaeoclimate conditions, the morphology and ecology of the carbonate platform had a significant effect on the distribution and composition of clay assemblages during the Late Hauterivian-Early Aptian along the northern Tethyan margin.

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“…The top of the upper succession is composed of a 1.5-2 m thick interval of coarse-grained, glauconite-containing, crinoidal limestone (Schaub, 1936;Gainon, 2001). The two successions are dated by correlation to fossiliferous outcrops in central and eastern Switzerland: the lower succession covers the middle part of the Early Hauterivian (loryi to nodosoplicatum zones), whereas the upper succession is attributed to the Middle Late Hauterivian (ligatum to angulicostatum zones; Kuhn, 1996;Van de Schootbrugge, 2001; Van de Schootbrugge et al, 2003;Bodin et al, 2006b The Altmann Member follows directly on top of the Kieselkalk Formation and starts with a thin (approximately 0.1 m) limestone bed rich in phosphate nodules, partly silicified belemnites, quartz, and glauconite (Fig. 2).…”

Section: Kieselkalk Formation (Hauterivian)mentioning

confidence: 99%

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

Föllmi

Gainon

2008

Sedimentary Geology

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The sedimentary succession of the Col de la Plaine Morte area (Helvetic Alps, central Switzerland) documents the disappearance of the northern Tethyan Urgonian platform in unprecedented detail and suggests stepwise platform demise, with each drowning phase documented by erosion and phosphogenesis. The first identified drowning phase terminated Urgonian carbonate production in a predominantly photozoan mode. Using a correlation of the whole-rock δ 13 C record with the well-dated record from SE France, its age is inferred to as Middle Early Aptian (near the boundary between the weissi and deshayesi zones). A subsequent drowning phase is dated by ammonites and by a correlation of the whole-rock δ 13 C record as Late Early Aptian (late deshayesi to early furcata zone). A third drowning phase provides an ammonite-based age of Early Late Aptian (subnodosocostatum and melchioris zones) and is part of a widely recognized phase of sediment condensation and phosphogenesis, which is dated as latest Early to Middle Late Aptian (late furcata zone to near the boundary of the melchioris and nolani zones). The fourth and final drowning phase started in the latest Aptian (jacobi zone) as is also indicated by ammonite findings at the Col de la Plaine Morte. The phases of renewed platform-carbonate production intervening between the drowning phases were all in a heterozoan mode. During the ultimate drowning phase, phosphogenesis continued until the Early Middle Albian, whereas condensation processes lasted until the Middle Turonian. Coverage of the external margin of the drowned Urgonian platform by a drape of pelagic carbonates started only in the Late Turonian. During the Santonian, the external part of the drowned platform underwent normal faulting and saw the re-exposure of already lithified Urgonian carbonates at the seafloor. Based on the here-inferred ages, the first drowning phase just precedes oceanic anoxic episode 1a (OAE 1a or "selli event") in time, and the second drowning phase partly overlaps with OAE 1a. The onset of the third drowning event slightly predates two further periods of increased organic-matter accumulation in the Vocontian Basin (Noir and Fallot levels), and the onset of the fourth and final drowning phase may coincide with two further periods of increased organic-matter accumulation in the Vocontian Basin (Jacob and Kilian levels, part of OAE 1b). These correlations indicate a relationship between the so-called anoxic episodes and the stepwise demise of the Urgonian platform, even if the onset of environmental change is registered earlier on the platform than in basinal sediments.

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Decoupling of P- and Corg-burial following Early Cretaceous (Valanginian–Hauterivian) platform drowning along the NW Tethyan margin

Cited by 46 publications

References 35 publications

The late Hauterivian Faraoni oceanic anoxic event in the western Tethys: Evidence from phosphorus burial rates

The late Hauterivian Faraoni oceanic anoxic event in the western Tethys: Evidence from phosphorus burial rates

Platform-induced clay-mineral fractionation along a northern Tethyan basin-platform transect: implications for the interpretation of Early Cretaceous climate change (Late Hauterivian-Early Aptian)

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

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