Progressive palaeoenvironmental change during the Late Barremian–Early Aptian as prelude to Oceanic Anoxic Event 1a: Evidence from the Gorgo a Cerbara section (Umbria-Marche basin, central Italy)

Stein, M.; Föllmi, Karl B.; Westermann, Stéphane; Godet, Alexis; Adatte, Thierry; Matera, Virginie; Fleitmann, Dominik; Berner, Zsolt

doi:10.1016/j.palaeo.2011.01.025

Cited by 101 publications

(79 citation statements)

References 69 publications

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“…2 and 3). The overall P contents are relatively low and comparable to those of other sections in the Maiolica Formation (e.g., Gorgo a Cerbara, Stein et al, 2011) or in older intervals of the Maiolica Formation in the same sections (Westermann, 2010). The general trend in P contents in carbonate samples are comparable to those compiled by Bodin et al (2006a) and Föllmi (1995).…”

Section: Phosphorus Contents and C Org :P Tot Molar Ratiossupporting

confidence: 64%

“…All other measured intervals possess TOC contents below 7 and 4 wt%, for the Breggia and Capriolo sections, respectively. These values are generally lower than the values measured for the Faraoni interval in central Italy (e.g., Baudin, 2005), whereas they are higher than the ones measured in organic-rich layers immediately underneath the Selli Level in central Italy (Stein et al, 2011). In comparison to the Breggia section, the TOC values in Capriolo are generally lower.…”

Section: Organic-carbon Contents and Preservationcontrasting

confidence: 59%

“…Organic-rich sediments associated with the OAE 1a have been documented from different marine basins, such as the Vocontian Basin (Bréhéret, 1988), the Lower Saxony Basin (Kemper and Zimmerle, 1978;Mutterlose et al, 2009), the southern Tethyan realm (Heldt et al, 2008), the central and southern Atlantic (Bralower et al, 1994) and the central and northwestern Pacific (Sliter, 1989;Bralower et al, 2002). Together with the Late Cenomanian "Bonarelli event", the Selli episode represents a model OAE for a wide range of investigations (e.g., Menegatti et al, 1998;Erba et al, 2010;Tejada et al, 2010;Stein et al, 2011). Both the Faraoni and Selli events have been associated with phases of intensified volcanic activity and associated environmental change, which led to higher nutrient availability, higher primary productivity rates and the corresponding development of oceanic anoxic conditions (e.g., Baudin, 2005;Tejada et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys

et al. 2012

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Abstract.A detailed geochemical analysis was performed on the upper part of the Maiolica Formation in the Breggia (southern Switzerland) and Capriolo sections (northern Italy). The analysed sediments consist of well-bedded, partly siliceous, pelagic carbonate, which lodges numerous thin, dark and organic-rich layers. Stable-isotope, phosphorus, organic-carbon and a suite of redox-sensitive trace-element contents (RSTE: Mo, U, Co, V and As) were measured. The RSTE pattern and C org :P tot ratios indicate that most organic-rich layers were deposited under dysaerobic rather than anaerobic conditions and that latter conditions were likely restricted to short intervals in the latest Hauterivian, the early Barremian and the pre-Selli early Aptian.

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Section: Phosphorus Contents and C Org :P Tot Molar Ratiossupporting

confidence: 64%

Section: Organic-carbon Contents and Preservationcontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys

et al. 2012

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“…8); in a broad sense, the relative distributions are similar, with C29 always being dominant (48%-70%), C27 intermediate (19%-28%), and C28 minor (9%-31%), but considerable variability within that framework is present. Further variability is reflected by the abun dance of a C 3 0 4-methylsterane, tentatively interpreted to be dinosterane on the basis of its mass spectrum and retention time (Summons et al, 1987), which is present in some XF and CAU sam ples but is absent or occurs in only trace abundances in the PN and Carbonero samples. In fact, in one sample (Cau-24, see Fig.…”

Section: Steranesmentioning

confidence: 99%

“…nannofossil assemblages from this interval in the Cau section contain higher proportions of nannoconids and pentaliths (Braarudosphaera, Micrantholithus) than those of the La Frontera section. Nannoconids are well-documented Cretaceous taxa predominantly associated to low-latitude carbonate-shelfal and epicontinental basins likely with stratified waters (Thierstein, 1976;Roth and Bowdler, 1981;Roth and Krumbach, 1986;Busson and Noel, 1991;Muttertose, 1992;Street and Bown, 2000;Bown, 2005). They are also related to oligotrophic surface waters in which salinity may also have played a significant control (lees et al, 2005).…”

Section: Correlation Of C-isotope Curves and Integration Vvith Biostrmentioning

confidence: 99%

Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

Quijano

Jiménez

Pancost

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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The Early Aptian Oceanic Anoxic Event (OAEla) is a time interval characterized by increased organic carbon accumulation in marine sediments, notable sedimentary and biotic changes, and abrupt carbon-isotope excursions indicative of significant major palaeoenvironmental changes linked to a perturbation in the global carbon cycle. Here we present the study of four sections recording the OAEl a (Early Aptian) in Spain, which are located in two broad basins respectively located in the South and the North of Iberia: the Southern Iberian Palaeomargin (Carbonero, La Frontera and Cau sections) and the Basque-Cantabrian Basin (Puentenansa section), which represent depositional settings ranging from shallow marine (distal ramp -Cau-and drowned platform -Puentenansa-) to pelagic environments (Carbonero, La Frontera). Biomarker compositions, C-isotope profiles, biostratigraphic data and fades analysis from the four sections are correlated and integrat ed. The C-isotope curves all present a clear negative excursion followed by a positive shift. The integration of the C-isotope curves with the biostratigraphic data has been used to correlate the studied sections and to ten tatively identify the eight segments formerly proposed from the Alpine domain, and subsequently identified in sections worldwide. Four main groups of compounds are present in all sections: n-alkanes, isoprenoids, hopanes and steranes. n-Alkanes and acyclic isoprenoids (pristane and phytane) are dominant in most samples.The hopanes are represented by a range ofC27 to C35 components, with the specific isomers varying amongst the sections due to differences in thermal maturity. Steranes ocrur as a range of C27, C28 and C29 isomers, whereas diasteranes only occur in the most thermally mature section (Carbonero). Other compounds of interest include gammacerane and dinosterane. Differences in thennal maturity appear to be the first order control on different biomarker assemblages amongst the studied sections. The Carbonero section is thermally mature, whereas the nearby La Frontera and Cau sections are immature. Puentenansa has intermediate values. Organic matter is de rived from a range of terrestrial, marine and bacterial sources. The dominance of the C29 sterane isomers in all sections suggests a strong contribution from higher plants. The presence of gammacerane indicates water col umn stratification, and high C2g/C30 hopane ratios suggest anoxia at the water/sediment interface, respectively.Sedimentologic analysis also suggests anoxic conditions during sedimentation, but evidence for strong and per sistent water column anoxia is equivocaL The correlation of the sections reveals that sedimentation of organic-rich fades started earlier in pelagic and later in the shallow marine settings, which can be related to an expansion of the favorable conditions for organic matter accumulation and preservation from deep marine waters to shallower platform environments during the development ofOAEla.

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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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Progressive palaeoenvironmental change during the Late Barremian–Early Aptian as prelude to Oceanic Anoxic Event 1a: Evidence from the Gorgo a Cerbara section (Umbria-Marche basin, central Italy)

Cited by 101 publications

References 69 publications

Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys

Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys

Organic geochemistry, stable isotopes, and facies analysis of the Early Aptian OAE—New records from Spain (Western Tethys)

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

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