The radiolarian assemblages of the Bonarelli Horizon in the Umbria-Marche Apennines and Southern Alps, Italy

Salvini, Giovanni; Passerini, M.Marcucci

doi:10.1006/cres.1998.0130

Cited by 36 publications

(34 citation statements)

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“…The radiolarian turnover that occurs in the middle part of the BL allows the distinction of a "lower fauna" from an "upper" one, in agreement with Marcucci Salvini and Marcucci Passerini (1998). Fifty-four radiolarian species last occur during the lower-middle part of the BL (lower fauna) and underlying limestones.…”

Section: Radiolarian Bioevents and Patterns Of Faunal Changessupporting

confidence: 78%

“…Because UMB is currently the palaeogeographic realm with the best documented radiolarian record across the BL, Fig. 6 combines the data issued from the present high-resolution study with all those provided in previous studies from UMB (Marcucci Passerini et al, 1991;Erbacher and Thurow, 1997;Gallicchio et al, 1996;Salvini and Marcucci Passerini, 1998).…”

Section: Radiolarian Bioevents and Patterns Of Faunal Changesmentioning

confidence: 87%

“…They represent 40.6% of extinctions amongst the Upper Cenomanian radiolarian fauna. Extinction events were initiated since the Middle Cenomanian only to (1994), (c) O'Dogherty (1994) and (d) Salvini and Marcucci Passerini (1998). *, species identified under a different specific name by the cited authors.…”

Section: Radiolarian Bioevents and Patterns Of Faunal Changesmentioning

confidence: 99%

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The Radiolarian biotic response during OAE2. A high-resolution study across the Bonarelli level at Bottaccione (Gubbio, Italy)

Musavu-Moussavou

Danelian

Baudin

et al. 2007

Revue de Micropaléontologie

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Section: Radiolarian Bioevents and Patterns Of Faunal Changessupporting

confidence: 78%

Section: Radiolarian Bioevents and Patterns Of Faunal Changesmentioning

confidence: 87%

Section: Radiolarian Bioevents and Patterns Of Faunal Changesmentioning

confidence: 99%

See 1 more Smart Citation

The Radiolarian biotic response during OAE2. A high-resolution study across the Bonarelli level at Bottaccione (Gubbio, Italy)

Musavu-Moussavou

Danelian

Baudin

et al. 2007

Revue de Micropaléontologie

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“…Gallicchio et alii, 2008) and north Italy (cf. Salvini & Marcucci, 1998). These black sediments stratigraphically correspond to those linked to the late Cretaceous marine anoxic event pointed out by many authors at a global scale (SchlanGEr & JEnKynS, 1976;SchlanGEr & cita, 1982;arthur & PrEMoli Silva, 1982;PiErGiovanni, 1989;SchollE & arthur, 1980;arthur et alii, 1987).…”

Section: Stratigraphic Relationships Between Members and Implicationssupporting

confidence: 65%

The Scaglia Toscana Formation of the Monti del Chianti: new lithostratigraphic and biostratigraphic data

Pandeli

Fazzuoli

Sandrelli

et al. 2018

IJG

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The Scaglia Toscana Formation (Scisti Policromi Auctt.) is one of the most investigated formations of the Tuscan Nappe. The formation is widely exposed in the Chianti Mounts and despite the number of studies in this area, some aspects remain poorly known and debated.In this paper new litho-and bio-stratigraphic data from eight key-sections distributed over the entire area are provided and discussed in order to clarify the stratigraphic relationships among different lithostratigraphic members, as well as the depositional ages of each member. The formation was deposited in the Cretaceous-Oligocene time interval and it can be subdivided into five lithostratigraphic members: i) the "Argilliti di Brolio" (wine-red shales with sporadic siliceous calcilutites and rare interbedded cherts); ii) the "Marne del Sugame" (red and pink marls, calcareous marls and marly limestones with interbedded calcarenitic beds and ruditic lens-shaped bodies including calcareous-siliceous clasts); iii) the "Argilliti di Cintoia" (greygreen to black shales, locally with manganese-rich siliceous calcilutites and cherts); iv) the "Calcareniti di Montegrossi" (thin beds of calcilutites and calcarenites with varicoloured shaly-marly interbeds); and v) the "Argilliti e Calcareniti di Dudda" (alternating thin beds of calcilutites and calcarenites with varicoloured shaly-marly interbeds). These members were deposited in a marine environment and have been interpreted as deposited in a turbiditic system, in which shaly and calcareous turbiditic members have been attributed to a basin plain below the CCD, whereas the marls and marly limestones of the Marne del Sugame Member were deposited in a slope/ramp environment above or close to the CCD. Furthermore, the combination of these new data with structural informations coming from the literature allowed a better paleogeographic reconstruction of the paleobasin.In order to better explain these data, the paper is accompanied by two geological maps realized in the past but never distributed. The two geological maps, at the scale of 1:25,000, cover the whole area from the Cintoia (south of Florence) to the San Gusmè (north of Siena) villages.

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“…The Bonarelli Level, which has been recognized in different settings throughout Italy from the Southern Alps to Sicily (e.g., Bosellini and others, 1978;Arthur and Premoli Silva, 1982;Coccioni and others, 1991;Marcucci and others, 1991;Gallicchio and others, 1996;Bellanca and others, 1998;Salvini and Marcucci Passerini, 1998;Luciani and Cobianchi, 1999;Premoli Silva and others, 1999;Avanzini and Luciani, 2001;Poletti and others, 2000;Coccioni and others, 2001;Dellisanti and others, 2001;Scopelliti and others, 2001), is marked by a major positive shift in ␦ 13 C of both bulk carbonate and organic carbon (Scholle and Arthur, 1980;Arthur and others, 1990;Jenkyns and others, 1994;Erbacher and others, 1996;Stoll and Schrag, 2000).…”

Section: Geological Contextmentioning

confidence: 98%

Planktonic Foraminifera and Environmental Changes Across the Bonarelli Event (Oae2, Latest Cenomanian) in Its Type Area: A High-Resolution Study From the Tethyan Reference Bottaccione Section (Gubbio, Central Italy)

Coccioni¹

2004

The Journal of Foraminiferal Research

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The worldwide latest Cenomanian Oceanic Anoxic Event 2 (OAE2) was investigated for the planktonic foraminiferal assemblages in the type area of its sedimentary expression, the C org -rich Bonarelli Level (Gubbio, central Italy). The 313 kyr preceding the onset of OAE2 and the 153 kyr following the end of this event were analyzed in the deep-water setting of the Bottaccione section (Umbria-Marche Basin). For the first time, a highresolution approach and quantitative methods were applied.Several events and biotic changes, including the acme and crisis of different genera, were recognized. They provide evidence of a progressive and rapid deterioration of paleoenvironmental conditions, reaching a climax coincident with the Bonarelli Event, and of the subsequent, gradual (although not complete) recovery. Although no major mass extinction in planktonic foraminifera occurred across the Bonarelli Event, the extinction of the most specialized forms, i.e., the rotaliporids, and Globigerinelloides bentonensis, is recorded just before its onset.The observed pattern of marked changes in planktonic foraminiferal assemblages indicates five discrete phases of different degrees of environmental perturbation within the marine ecosystem. Phase I (313-55 kyr prior to the onset of OAE2) is characterized by a high planktonic foraminiferal abundance and diversity that imply a relatively stable environment, with different ecological niches occupied and stratified water column. On the other hand, relatively high percentages of hedbergellids and heterohelicids indicate a general meso-eutrophic environment and a well-developed oxygen minimum zone. Episodes of increased eutrophic conditions are indicated by pulses in abundance of radiolarians. A well-developed oxygen minimum zone may be related to a long-term change that precedes the onset of OAE2 (mid-Cenomanian Event). The most dramatic changes took place during Phase II and encompassed the last 55 kyr preceding deposition of the Bonarelli Level. The onset of a highstress environment is clearly shown by the shift to a distinctly unstable planktonic foraminiferal structure, characterized by low species diversity and marked foraminiferal changes and events. Some of these took place at the same time (the rotaliporid crisis, the heterohelicid decline, the Hedbergella-Schackoina shift, the onset of the 'large form eclipse' when Ͼ 150 m forms temporarily disappeared) followed by other sequential events (onset of dwarfism, schackoinid acme, and hedbergellid acme). The above-mentioned changes and events indicate for Phase II an increased surface productivity, enhanced oxygen minimum zone, and marked rapid changes of ecological parameters (e.g., temperature, salinity, trace metals). These marked foraminiferal changes culminate at the base of the Bonarelli Level with the temporary disappearance of all planktonic foraminifera. Phase III (100-900 kyr) coincides with the Bonarelli Level deposition and is characterized by highly eutrophic conditions, as indicated by radiolarian proliferation. Phase IV ...

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The radiolarian assemblages of the Bonarelli Horizon in the Umbria-Marche Apennines and Southern Alps, Italy

Cited by 36 publications

References 0 publications

The Radiolarian biotic response during OAE2. A high-resolution study across the Bonarelli level at Bottaccione (Gubbio, Italy)

The Radiolarian biotic response during OAE2. A high-resolution study across the Bonarelli level at Bottaccione (Gubbio, Italy)

The Scaglia Toscana Formation of the Monti del Chianti: new lithostratigraphic and biostratigraphic data

Planktonic Foraminifera and Environmental Changes Across the Bonarelli Event (Oae2, Latest Cenomanian) in Its Type Area: A High-Resolution Study From the Tethyan Reference Bottaccione Section (Gubbio, Central Italy)

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