Phosphogenesis, carbon-isotope stratigraphy, and carbonate-platform evolution along the Lower Cretaceous northern Tethyan margin

Föllmi, Karl B.; Weissert, Helmut; Bisping, Martin; Funk, H.

doi:10.1130/0016-7606(1994)106<0729:pcisac>2.3.co;2

Cited by 360 publications

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“…The oceanic anoxic episode is materialized in the subsequent phase of heterozoan carbonate production and the second step of the drowning process, which is documented by condensation and phosphogenesis recorded in the Plaine Morte Bed. This offset in timing was already observed (Föllmi et al, 1994(Föllmi et al, , 2007 and maybe related to the possibility that the Urgonian shallow-water carbonate platform reacted very sensibly to environmental change, whereas it took some additional time for the entire oceanic carbon cycle to adjust and correspondingly change its isotopic signature. …”

Section: Timing Of the Drowning Phases Of The Urgonian Carbonate Platmentioning

confidence: 99%

“…Multiple links have been proposed between chemical and environmental change on the continents, the shelf regions and deeper basins during these episodes, such as increased methane release from slope sediments (Wissler et al, 2003), ocean acidification (Weissert and Erba, 2004) and increased nutrient input from continents (Erba, 1994;Föllmi et al, 1994). These interpretations are all dependent on positive correlations between the numerous proxies of environmental change in the different compartments.…”

Section: Introductionmentioning

confidence: 99%

“…The sedimentary remains of a vast shallow-water carbonate platform attached to the northern Tethyan shelf and presently locked up in the Helvetic Alps have been revealed to have sensitively recorded paleoenvironmental change during the latest Jurassic and Early Cretaceous (Funk et al, 1993;Föllmi et al, 1994Föllmi et al, , 2006Föllmi et al, , 2007. They have furthermore the advantage that time control by ammonite stratigraphy is good, and as such they provide valuable insight into the effects of environmental change associated with the anoxic episodes.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Timing Of the Drowning Phases Of The Urgonian Carbonate Platmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…1) et documentent les restes de la marge nord-Téthysienne. Dans ces unités tectoniques, des carbonates de plate-forme alternent avec des sédi-ments phosphatés et glauconieux (par exemple, [7,10]). Dans cette note, de nouvelles ammonites appartenant à un de ces intervalles glauconieux (le membre du Chopf) sont figurées ; elles sont attribuées au Barrémien supé-rieur moyen.…”

Section: Introductionunclassified

“…1) and includes a sedimentary succession which documents the evolution of the northern Tethyan margin during the Mesozoic and Early Tertiary. The Lower Cretaceous comprised in this tectonic zone is composed of an alternation of photozoan and heterozoan platform carbonates and highly condensed phosphatized and glauconitic sediments (e.g., [7,10]). These latter sediments are associated with repetitive drowning episodes, which interfered with the growth of the northern Tethyan carbonate platform.…”

Section: Introductionmentioning

confidence: 99%

New data on the age of the installation of Urgonian-type carbonates along the northern Tethyan margin: biostratigraphy of the Chopf Member (Helvetic Alps, eastern Switzerland)

Bodin

Vermeulen²,

Godet

et al. 2006

Comptes Rendus. Géoscience

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The Chopf Member is a glauconitic, phosphate-bearing succession that occurs in the distal part of the Helvetic Alps (eastern Switzerland). The recent discovery of age-diagnostic ammonites within this horizon allows for its attribution to the lower part of the Gerhardtia sartousiana zone (middle Late Barremian). This new age corresponds to a maximal age for the onset of the Schrattenkalk Fm. in this area, and is coeval with the onset of the Urgonian facies in other parts of the western Tethyan realm. This new age allows also for a more precise dating of Late Barremian δ 13 C curves. RésuméDonnées nouvelles sur la datation de l'installation des calcaires urgoniens le long de la marge nord-téthysienne : biostratigraphie du membre du Chopf (nappes Helvétiques, Suisse orientale). Le membre du Chopf correspond à un horizon glauconieux déposé dans la partie distale de la plate-forme helvétique. La découverte récente d'ammonites permet de dater pré-cisément cet horizon de la partie inférieure de la zone à Gerhardtia sartousiana (Barrémien supérieur moyen). Cette nouvelle datation permet de donner un âge maximal à la formation du Schrattenkalk dans cette région. Cet âge est cohérent avec ceux qui sont obtenus dans les autres parties de la Téthys occidentale pour l'installation des faciès urgoniens. Cette nouvelle datation permet aussi d'apporter des précisions sur la calibration des courbes du δ 13 C du Barrémien supérieur.

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Improving shallow‐water carbonate chemostratigraphy by means of rudist bivalve sclerochemistry

Huck

Heimhofer

2015

Geochem Geophys Geosyst

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Deep-time shallow-marine carbonate platforms record distinct biotic responses to climatic and environmental stressors. Unfortunately, precise temporal assignment of these biotic responses is often problematical due to poor biostratigraphic control and/or a significant diagenetic overprint of the neritic bulk carbonate chemostratigraphic inventory. An accurate stratigraphic framework is essential to better understand the causal relation between biotic events recorded by carbonate platforms and environmental changes that, for instance, culminated in mass extinction events or prolonged episodes of oceanic anoxia. Here we provide an integrated carbon and strontium-isotope stratigraphy of the Early Cretaceous subtropical Provence carbonate platform in SE France that is based solely on pristine low-Mg calcite from rudist bivalves. Carbon-isotope data of geochemically screened rudist fragments enabled reconstruction of a characteristic Barremian pattern including the Mid-Barremian Event (MBE) that allowed for a precise correlation with stratigraphically well-constrained Tethyan shallow-water and hemipelagic reference sections. In order to evaluate ontogenetic carbon-isotope changes and the overall variability of the shell-derived carbon-isotope data, numerous sclerochronological carbon-isotope profiles of individual large rudist shells are presented. Strontium-isotope stratigraphy supports the carbon-isotopebased age of the studied sections, but also provides unequivocal evidence for a major hiatus in the depositional record covering large parts of the Late Barremian. In contrast to biostratigraphic and bulk carbonate chemostratigraphic archives, the here established chronostratigraphy of carbonate platform evolution in the southern Provence region demonstrates a twofold resurgence of rudist-rich carbonate platform production during the Early Aptian and arguably the latest Early Aptian.

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Phosphogenesis, carbon-isotope stratigraphy, and carbonate-platform evolution along the Lower Cretaceous northern Tethyan margin

Cited by 360 publications

References 0 publications

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

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

New data on the age of the installation of Urgonian-type carbonates along the northern Tethyan margin: biostratigraphy of the Chopf Member (Helvetic Alps, eastern Switzerland)

Improving shallow‐water carbonate chemostratigraphy by means of rudist bivalve sclerochemistry

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