Responses of calcareous nannofossil assemblages, mineralogy and geochemistry to the environmental perturbations across the Paleocene/Eocene boundary in the Venetian Pre-Alps

Agnini, Claudia; Fornaciari, Eliana; Rio, Domenico; Tateo, Fabio; Backman, Jan; Giusberti, Luca

doi:10.1016/j.marmicro.2006.10.002

Cited by 111 publications

(159 citation statements)

References 66 publications

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“…This basin represents part of a paleogeographic domain that formed when Jurassic rifting created a series of N-S-oriented structural highs (platforms) and lows (basins), which persisted through much of the Paleogene (Bernoulli and Jenkyns, 1974;Bernoulli et al, 1979;Winterer and Bosellini, 1981). Importantly, from the Cretaceous to the middle-late Eocene, expanded deep sea sediment successions accumulated within the basins at nominally 30 • N latitude (Stefani and Grandesso, 1991;Agnini et al, 2006Agnini et al, , 2011Zattin et al, 2006). The Cicogna section consists of two lithostratigraphic units (Fig.…”

Section: The Cicogna Sectionmentioning

confidence: 99%

“…The prominent changes in temperature and carbon fluxes almost assuredly caused large variations in seawater pH and carbonate ion concentration (CO 2− 3 ; Dickens et al, 1997;Zachos et al, 2005;Kump et al, 2009;Zeebe et al, 2009;LeonRodriguez and Dickens, 2010;Hönisch et al, 2012;, although the response should depend on location and carbon fluxes involved (Dickens, 2000;Zeebe and Westbroek, 2003;Komar et al, 2013). Such changes might also affect the ability of living organisms to calcify (Riebesell et al, 2000(Riebesell et al, , 2008Kleypas et al, 2006;Iglesias-Rodriguez et al, 2008;Stillman and Paganini, 2015), which might impact the fossil record (Agnini et al, 2006;Raffi and De Bernardi, 2008;Erba et al, 2010;Hönisch et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Various "events" are noted within this chronostratigraphic framework, including the Paleocene carbon isotope maximum (PCIM), the Paleocene-Eocene Thermal Maximum (PETM), the H-1/ETM-2 event, the K/X event, and the Early Eocene Climatic Optimum (EECO). To the right is the general lithologic column and magnetostratigraphy of the Cicogna section (Dallanave et al, 2009). While numerous studies have examined calcareous nannofossils across the PETM from different perspectives (e.g., Bralower, 2002;Stoll and Bains, 2003;Gibbs et al, 2006a, b;Agnini et al, 2007a;Mutterlose et al, 2007;Bown and Pearson, 2009;Jiang and Wise, 2009;Self-Trail et al, 2012), the relationship between these organisms and carbon cycle perturbations before and after this short-lived warming episode remain poorly documented . It seems possible that the high rate of calcareous nannofossil taxonomic evolution (appearances and extinctions), as well as distinct changes in calcareous nannofossil abundance patterns, may provide excellent stratigraphic control across the early Paleogene (Bukry, 1973;Perch-Nielsen, 1985;Backman, 1986;Agnini et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The two notable exceptions are Ocean Drilling Program (ODP) Site 1262 (southeast Atlantic; Agnini et al, 2007b;Zachos et al, 2010) and Deep Sea Drilling Project (DSDP) Site 577 (northwest Pacific; Shackleton, 1986;Dickens and Backman, 2013;Fig. 2 Backman, 1986;Aubry, 1999a;Bralower, 2002;Dupuis et al, 2003;Tremolada and Bralower, 2004;Bralower and Mutterlose, 1995;Monechi et al, 2000;Gibbs et al, 2004;Raffi et al, 2005;Agnini et al, 2007a;Angori et al, 2007;Mutterlose et al, 2007;Jiang and Wise, 2009;Shamrock, 2010;Norris et al, 2014;Dallanave et al, 2015). content) and calcareous nannofossil census data from the Cicogna section in northeast Italy (Figs.…”

Section: Introductionmentioning

confidence: 99%

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Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section)

Agnini

Spofforth²,

Dickens

et al. 2016

Clim. Past

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Abstract. We present records of stable carbon and oxygen isotopes, CaCO 3 content, and changes in calcareous nannofossil assemblages across an 81 m thick section of upper Paleocene-lower Eocene marine sedimentary rocks now exposed along the Cicogna Stream in northeast Italy. The studied stratigraphic section represents sediment accumulation in a bathyal hemipelagic setting from approximately 57.5 to 52.2 Ma, a multi-million-year time interval characterized by perturbations in the global carbon cycle and changes in calcareous nannofossil assemblages. The bulk carbonate δ 13 C profile for the Cicogna section, once placed on a common timescale, resembles that at several other locations across the world, and includes both a long-term drop in δ 13 C and multiple short-term carbon isotope excursions (CIEs). This precise correlation of widely separated δ 13 C records in marine sequences results from temporal changes in the carbon composition of the exogenic carbon cycle. However, diagenesis has likely modified the δ 13 C record at Cicogna, an interpretation supported by variations in bulk carbonate δ 18 O, which do not conform to expectations for a primary signal. The record of CaCO 3 content reflects a combination of carbonate dilution and dissolution, as also inferred at other sites. Our detailed documentation and statistical analysis of calcareous nannofossil assemblages show major differences before, during and after the Paleocene-Eocene Thermal Maximum. Other CIEs in our lower Paleogene section do not exhibit such a distinctive change; instead, these events are sometimes characterized by variations restricted to a limited number of taxa and transient shifts in the relative abundance of primary assemblage components. Both long-lasting and short-lived modifications to calcareous nannofossil assemblages preferentially affected nannoliths or holococcoliths such as Discoaster, Fasciculithus, Rhomboaster/Tribrachiatus, Sphenolithus and Zygrhablithus, which underwent distinct variations in abundance as well as permanent evolutionary changes in terms of appearances and disappearances. By contrast, placoliths such as Coccolithus and Toweius, which represent the main component of the assemblages, were characterized by a gradual decline in abundance over time. Comparisons of detailed nannofossil assemblage records at the Cicogna section and at ODP Site 1262 support the idea that variations in the relative and absolute abundances, even some minor changes, were globally synchronous. An obvious link is through climate forcing and carbon cycling, although the linkages between variations in calcareous nannoplankton, changes in δ 13 C records and oceanography will need additional work.

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Section: The Cicogna Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section)

Agnini

Spofforth²,

Dickens

et al. 2016

Clim. Past

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“…In addition this work takes into account more recent papers studying Paleogene calcareous nannofossil paleoecology in areas of the Southern Ocean (e.g. Wei et al 1992;Bralower 2002;Persico & Villa 2004;Villa & Persico 2006;Villa et al 2008) and mid-latitude oceans (Agnini et al 2006;Gibbs et al 2006 Wei & Wise 1990;Villa et al 2008) which are present, but never abundant. The warmwater species constitute less than 9 % of the association ( Fig.…”

Section: Paleoecologymentioning

confidence: 99%

Paleoecology of the Upper Eocene-Lower Oligocene Malcov Basin based on the calcareous nannofossils: a case study of the Leluchów section (Krynica Zone, Magura Nappe, Polish Outer Carpathians)

Oszczypko-Clowes¹,

Żydek²

2012

Geologica Carpathica

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During the period of ca. 20 Ma (Middle Eocene-Chattian) the Leluchów Succession of the Magura Basin passed through drastic changes of sedimentary condition and paleobathymetry from well oxygened red shales with Reticulofragmium amplectens, deposited beneath CCD, red Globigerina oozes, to oxygen depleted organic-rich menilitetype shales and finally to flysch deposition of open marine conditions. The biostratigraphic and lithostratigraphic scheme is well established with the Leluchów Marl Member -Zones NP19-20 to NP22 (Late Eocene-Early Oligocene), Smereczek Shale Member, Zone NP23 (Early Oligocene) and the Malcov Formation s.s., Zone NP24 (Early-Late Oligocene). The aim of the paper is to present the quantitative analyses as the basis for paleoecological changes in the Magura Basin during the Late Eocene-Late Oligocene period. The changes manifest themselves through a decrease in the water temperature and progressing eutrophication. Species typical of brackish water conditions and restricted to the Paratethys region were identified from the NP23 Zone.

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The dynamics of global change at the Paleocene-Eocene thermal maximum: A data-model comparison

Bralower

Meißner

Alexander

et al. 2014

Geochem. Geophys. Geosyst.

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We integrate published stable isotopic, chemical, mineralogical, and biotic data from the onset of the Paleocene-Eocene thermal maximum (PETM) at Site 690, Maud Rise in the Southern Ocean. The integrated data set documents a sequence of environmental steps including warming of the ocean from the surface downward, and modification of its thermal and nutrient structure, acidification of the deep ocean, and the onset of continental weathering. The age of the events with respect to the onset of the PETM is calibrated with three different age models. The relative and absolute timing of the steps are compared with simulated temperature, salinity, calcite saturation, and dissolved PO 4 and O 2 , at different depths in the ocean, generated with the UVic Earth System Climate Model of intermediate complexity. The simulation supports the top to bottom transfer of heat and carbon, and generally agrees with age models in terms of the durations of leads and lags in temperature, C-isotope, and biotic responses. Moreover, the simulation shows that stratification increased and the nutricline strengthened at the onset of the PETM. These environmental changes explain the abundance of deep-dwelling nannoplankton and foraminifera during the early part of the event. The modeled calcite saturation is consistent with a harsh deep-sea habitat at the time of the benthic foraminiferal extinction.

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Responses of calcareous nannofossil assemblages, mineralogy and geochemistry to the environmental perturbations across the Paleocene/Eocene boundary in the Venetian Pre-Alps

Cited by 111 publications

References 66 publications

Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section)

Stable isotope and calcareous nannofossil assemblage record of the late Paleocene and early Eocene (Cicogna section)

Paleoecology of the Upper Eocene-Lower Oligocene Malcov Basin based on the calcareous nannofossils: a case study of the Leluchów section (Krynica Zone, Magura Nappe, Polish Outer Carpathians)

The dynamics of global change at the Paleocene-Eocene thermal maximum: A data-model comparison

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