Chapter E1 Integrated stratigraphy of the middle to upper miocene pelagic sequence of the cönero riviera (Marche region, Italy)

Montanari, A.; Beaudoin, Bernard; Chan, Lai K.; Coccioni, Rodolfo; Deino, A.; DePaolo, D.J.; Emmanuel, Laurent; Fornaciari, Eliana; Kruge, Michael A.; Lundblad, Steven P.; Mozzato, Cinzia; Portier, Éric; Renard, Maurice; Rio, Domenico; Sandroni, P; Stankiewicz, Artur

doi:10.1016/s0920-5446(06)80033-6

Cited by 31 publications

(77 citation statements)

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“…The only exception is Monte dei Corvi which contains two volcanic ash layers that have been dated using the 40 Ar= 39 Ar incremental-heating technique (Montanari et al, 1997). Our study resulted in a direct astronomical age control with an unprecedented accuracy and resolution for the interval straddling the Serravallian=Tortonian boundary, thereby extending the existing astronomical timescale in the Mediterranean back to 12.1 Ma.…”

Section: Comparison With Other Timescalesmentioning

confidence: 89%

“…Despite the tectonic deformation and lack of a magnetostratigraphy, section Gibliscemi remains a potential candidate for defining the Tortonian GSSP because it contains a continuous and astronomically dated succession over this interval with an outstanding calcareous plankton biostratigraphy and biochronology, and intercalated ash layers. The alternative section of Monte dei Corvi has as yet not been astronomically dated but is similarly unsuitable for establishing a reliable magnetostratigraphy (Montanari et al, 1997). A potentially serious shortcoming is that neither the D. kugleri acme nor the first influx of the neogloboquadrinids have been reported from Monte dei Corvi.…”

Section: Serravallian=tortonian Boundarymentioning

confidence: 99%

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Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Hilgen

Krijgsman²,

Raffi

et al. 2000

Marine Micropaleontology

118

148

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Results are presented of an integrated stratigraphic (calcareous plankton biostratigraphy, cyclostratigraphy and magnetostratigraphy) study of the Serravallian=Tortonian (S=T) boundary section of Monte Gibliscemi (Sicily, Italy). Astronomical calibration of the sedimentary cycles provides absolute ages for calcareous plankton bio-events in the interval between 9.8 and 12.1 Ma. The first occurrence (FO) of Neogloboquadrina acostaensis, usually taken to delimit the S=T boundary, is dated astronomically at 11.781 Ma, pre-dating the migratory arrival of the species at low latitudes in the Atlantic by almost 2 million years. In contrast to delayed low-latitude arrival of N. acostaensis, Paragloborotalia mayeri shows a delayed low-latitude extinction of slightly more than 0.7 million years with respect to the Mediterranean (last occurrence (LO) at 10.49 Ma at Ceara Rise; LO at 11.205 Ma in the Mediterranean). The Discoaster hamatus FO, dated at 10.150 Ma, is clearly delayed with respect to the open ocean. The ages of D. kugleri first and last common occurrence (FCO and LCO), Catinaster coalitus FO, Coccolithus miopelagicus last (regular) occurrence (L(R)O) and the D. hamatus=neohamatus cross-over, however, are in good to excellent agreement with astronomically tuned ages for the same events at Ceara Rise (tropical Atlantic), suggesting that both independently established timescales are consistent with one another. The lack of a reliable magnetostratigraphy hampers a direct comparison with the geomagnetic polarity timescale of Cande and Kent (1995; CK95), but ages of calcareous nannofossil events suggests that CK95 is significantly younger over the studied time interval. Approximate astronomical ages for the polarity reversals were obtained by exporting astronomical ages of selected nannofossil events from Ceara Rise (and the Mediterranean) to eastern equatorial Pacific ODP Leg 138 Site 845, which has a reliable magnetostratigraphy.Our data from the Rio Mazzapiedi-Castellania section reveal that the base of the Tortonian stratotype corresponds almost exactly with the first regular occurrence (FRO) of N. acostaensis s.s. as defined in the present study, dated at 10.554 Ma. An extrapolated age of 11.8 Ma calculated for the top of the Serravallian stratotype indicates that there is a gap between the top of the Serravallian and the base of the Tortonian stratotype, potentially rendering all bio-events in the interval between 11.8 and 10.554 Ma suitable for delimiting the S=T boundary. Despite the tectonic deformation and the lack of a magnetostratigraphy, Gibliscemi remains a candidate to define the S=T boundary by means of the Tortonian global boundary stratotype section and point (GSSP). © 2000 Elsevier Science B.V. All rights reserved.Ł Corresponding author. E-mail: fhilgen@geo.uu.nl 0377-8398/00/$ -see front matter © 2000 Elsevier Science B.V. All rights reserved. PII: S 0 3 7 7 -8 3 9 8 ( 0 0 ) 0 0 0 0 8 -6 182 F.J. Hilgen et al. / Marine Micropaleontology 38 (2000)

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Section: Comparison With Other Timescalesmentioning

confidence: 89%

Section: Serravallian=tortonian Boundarymentioning

confidence: 99%

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Hilgen

Krijgsman²,

Raffi

et al. 2000

Marine Micropaleontology

118

148

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“…Deep water sediments of the North Apennine foredeep from the Umbria-Marche region in Italy were sampled to construct a composite sequence of Miocene marine sedimentation (Figure 2). The samples were taken from five previously described and well-dated sections that belong to three formations [Deino et al, 1997;Montanari et al, 1997aMontanari et al, , 1997b, referred to here as UMC (UmbriaMarche composite section).…”

Section: Mediterraneanmentioning

confidence: 99%

“…[15] Several volcaniclastic layers occur within these sections and many of them were dated [e.g., Mader et al, 2001]. Given estimates of the sedimentation rates [Deino et al, 1997;Montanari et al, 1997aMontanari et al, , 1997b, as well as the biostratigraphic position of the samples, and combining this with recent astronomical and magnetostratigraphic estimates of the ages of the sediments [e.g., Cleaveland et al, 2002;Hilgen et al, 2003Hilgen et al, , 2005, it was possible to assign absolute numerical ages to the sampled horizons (Table 1a).…”

Section: Mediterraneanmentioning

confidence: 99%

“…A source with appropriately low 87 Sr/ 86 Sr could have been the Mesozoic carbonates. According to Deino et al [1997] and Montanari et al [1997aMontanari et al [ , 1997b, such rocks have discharged sediments from the western Apennines. Indeed, warmer and more humid conditions during the middle Miocene could have also favored weathering of carbonate rocks.…”

Section: Strontium Isotope Composition Of the Fossilsmentioning

confidence: 99%

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Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

et al. 2008

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[1] Isotopic compositions of marine sediments and fossils have been investigated from northern basins of the Mediterranean to help constrain local oceanographic and climatic changes adjacent to the uplifting Alps. Stable C and O isotope compositions of benthic and planktonic foraminifera from the Umbria-Marche region (UMC) have an offset characteristic for their habitats and the changes in composition mimic global changes, suggesting that the regional conditions of climate and the carbon cycle were controlled by global changes. The radiogenic isotope composition of these fossil assemblages allows recognition of three distinct periods. In the first period, from 25 to 19 Ma, high e Nd values and low 87 Sr/ 86 Sr of sediments and fossils support intense tectonism and volcanism, related to the opening of the western Mediterranean. In the second period, from 19 to 13 Ma the 87 Sr/ 86 Sr ratio of Mediterranean (UMC) deviate from the global ocean, which is compatible with rapid uplift of the hinterland and intense influx of Sr from Mesozoic carbonates of the western Apennines. This local control on the seawater was driven by a humid and warm climate and indicates restricted exchange of water with the global ocean. Generally, the e Nd values of the fossils are very similar to those of Indian Ocean water, with brief periods of a decrease in the e Nd values coinciding with volcanic events and maybe sea level variation at 15.2 Ma. In the third period, from 13 to 10 Ma the fossils have 87 Sr/ 86 Sr similar to those of Miocene seawater while their e Nd values change considerably with time. This indicates fluctuating influence of the Atlantic versus the Paratethys and/or locally evolved seawater in the Mediterranean driven by global sea level changes. Other investigated localities near the Alps and from the ODP 900 site are compatible with this oceanographic interpretation. However, in the late early Miocene, enhanced local control, reflecting erosion of old crustal silicate rocks near the Alps, results in higher 87 Sr/ 86 Sr.Citation: Kocsis, L., T.

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Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

Schildgen

Cosentino

Frijia

et al. 2014

Geochem Geophys Geosyst

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Sr isotope records from marginal marine basins track the mixing between seawater and local continental runoff, potentially recording the effects of sea level, tectonic, and climate forcing in marine fossils and sediments. Sr/ 86 Sr analyses from the astronomically tuned Lower Evaporites in the central Apennines (Italy) allow us to explore the effect of glacio-eustatic sea level and precipitation changes on 87 Sr/ 86 Sr. Most variation in our data can be explained by changes in sea level, with greatest negative excursions from global seawater values occurring during relative sea level lowstands, which generally coincided with arid conditions in the Mediterranean realm. We suggest that this greater sensitivity to lowered sea level compared with higher runoff could relate to the inverse relationship between Sr concentration and river discharge. Variations in the residence time of groundwater within the karst terrain of the circum-Mediterranean region during arid and wet phases may help to explain the single (robust) occurrence of a negative excursion during a sea level highstand, but this explanation remains speculative without more detailed paleoclimatic data for the region.

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Chapter E1 Integrated stratigraphy of the middle to upper miocene pelagic sequence of the cönero riviera (Marche region, Italy)

Cited by 31 publications

References 0 publications

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Integrated stratigraphy and astronomical calibration of the Serravallian/Tortonian boundary section at Monte Gibliscemi (Sicily, Italy)

Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

Sea level and climate forcing of the Sr isotope composition of lateMioceneMediterranean marine basins

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