Chapter C3 Integrated stratigraphy of the Chattian to mid-Bsurdigalian pelagic sequence of the contessa valley (Gubbio, Italy)

Montanari, A.; Bice, David M.; Capo, Rosemary C.; Coccioni, Rodolfo; Deino, A.; DePaolo, D.J.; Emmanuel, Laurent; Monechi, Simonetta; Renard, Maurice; Zevenboom, D.

doi:10.1016/s0920-5446(06)80021-x

Cited by 10 publications

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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%

“…[14] The Chattian/Aquitanian boundary (i.e., the Oligocene-Miocene boundary) in the Contessa Valley section (CT), near Gubbio, is in the uppermost part of the Scaglia Cinerea Formation, and bears a hiatus [Montanari et al, 1997a]. The base of the overlying Bisciaro Formation is in the middle Aquitanian (Chron 6AA), and it is marked by a regional bentonite layer (Raffaello Level), which has an Ar/ Ar age of 21.9 ± 0.3 Ma [Montanari et al, 1997a].…”

Section: Mediterraneanmentioning

confidence: 99%

“…The base of the overlying Bisciaro Formation is in the middle Aquitanian (Chron 6AA), and it is marked by a regional bentonite layer (Raffaello Level), which has an Ar/ Ar age of 21.9 ± 0.3 Ma [Montanari et al, 1997a]. Samples spanning the Chattian to Burdigalian interval were collected through this CT section, and also in the Moria section (MOR), which is located about 30 km north of Gubbio.…”

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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Section: Mediterraneanmentioning

confidence: 99%

Section: Mediterraneanmentioning

confidence: 99%

Section: Mediterraneanmentioning

confidence: 99%

Section: Mediterraneanmentioning

confidence: 99%

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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Miocene Oceanographic Evolution Based on the Sr and Nd Isotope Record of the Central Mediterranean

Cornacchia

Agostini

Brandano

2018

Paleoceanog and Paleoclimatol

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The Miocene is a key interval in the geodynamic and oceanographic evolution of the Mediterranean marking the transition from a wide open basin to the modern closed basin. We used the Sr and Nd isotope records of two Miocene carbonate successions in the Adriatic to document that the evolution of the Mediterranean Basin controlled its seawater chemistry. During the late Aquitanian (~21 Ma), a time of glaciation and sea level lowstand, increased runoff affected the Sr isotope ratios of Mediterranean waters, whereas during the Burdigalian (20.44–15.97 Ma) volcanism in the circum‐Mediterranean area mainly influenced the Sr isotopic signature. During the Langhian (15.97–13.82 Ma), a time of sea level highstand associated with the Middle Miocene Climatic Optimum, the Nd isotope values indicate that waters exchanged between the Paratethys and the Central Mediterranean. The Central Mediterranean was well connected with the Atlantic Ocean between the Langhian and the early Tortonian (15.97–11.5 Ma), but exchange of water with the Paratethys declined. In the Messinian (6.3 Ma), connections between some marginal Mediterranean basins, for example, the proto‐Adriatic basin, and the Central Mediterranean, became restricted. In this basin, the Sr isotope values fell below the global reference line, while Nd isotope ratios show a strong affinity with the Atlantic Ocean and also indicate freshwater input. We conclude that the Mediterranean Nd isotope signature differs from that in the open oceans and reflects the basin physiography, reflecting a mix of signals derived from the adjacent oceans and local signals.

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Perturbation at the sea floor during the Paleocene–Eocene Thermal Maximum: Evidence from benthic foraminifera at Contessa Road, Italy

Giusberti

Coccioni

Sprovieri

et al. 2009

Marine Micropaleontology

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Chapter C3 Integrated stratigraphy of the Chattian to mid-Bsurdigalian pelagic sequence of the contessa valley (Gubbio, Italy)

Cited by 10 publications

References 0 publications

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

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

Miocene Oceanographic Evolution Based on the Sr and Nd Isotope Record of the Central Mediterranean

Perturbation at the sea floor during the Paleocene–Eocene Thermal Maximum: Evidence from benthic foraminifera at Contessa Road, Italy

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