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Rio, D.
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Rio, D.
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- PublicationRestrictedChronology of the Lower-Middle Pleistocene succession of the south-western part of the Crotone Basin (Calabria, Southern Italy)(2011-05)
; ; ; ; ; ; ; ; ; ;Capraro, L.; Department of Geosciences, Via Gradenigo 6, I-35100 Padova, Italy ;Massari, F.; Department of Geosciences, Via Gradenigo 6, I-35100 Padova, Italy ;Rio, D.; Department of Geosciences, Via Gradenigo 6, I-35100 Padova, Italy ;Fornaciari, E.; Department of Geosciences, Via Gradenigo 6, I-35100 Padova, Italy ;Backman, J.; Department of Geology and Geochemistry, S-10691 Stockholm, Sweden ;Channell, J. E. T.; Department of Geological Sciences, POB 112120, Gainesville, FL-32611, USA ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Prosser, G.; Department of Geological Sciences, Campus Macchiaromana I-85100 Potenza, Italy ;Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; Biostratigraphy based on calcareous nannofossils, integrated by magnetostratigraphic, geochronological and isotopic data, allowed establishing a precise chronological framework for the Pleistocene succession within the south-western sector of the Crotone Basin (Calabria, Southern Italy), where the Pliocenee Pleistocene global stratotype section and point is defined, thus demonstrating that sedimentation was quasi-continuous during most of the Lower and Middle Pleistocene. At a large scale, the Pleistocene succession in this sector of the Crotone Basin is characterized by an evident shallowing-upwards trend, showing facies changes from bathyal to shelfal to littoral/continental. However, comparison between adjacent sectors within the investigated area demonstrates that stratigraphic architectures change vastly on very short distances. Our chronological constraints indicate that such changes in sedimentation styles probably occurred in response to differential subsidence rates, which originated tectonically-controlled synsedimentary structures where accommodation space and sediment yield were allotted unevenly. This articulated physiography led to striking differences in the overall thicknesses and organization of Pleistocene stratigraphies and, eventually, to a distinct diachroneity in the first appearance of shallow-marine deposits. In addition, superimposed are complex interplays between regional and local tectonics, eustasy and orbitally-forced climate changes. These interactions have been highlighted by the oxygen isotope stratigraphy established for a part of the studied succession, which is likely to document almost continuously the interval from Marine Isotope Stage (MIS) 26 to MIS 17. In its younger part (post-MIS 17), chronological ties are poor, as the succession is dominated by shallow-water to continental deposits showing a prominent organization into cyclothems. Nevertheless, based on the chronology of the underlying units, it is feasible that basin infill ended during MIS 15-MIS 14 times.265 30 - PublicationRestrictedPaleomagnetic evidence for a post–1.2 Ma disruption of the Calabria terrane: Consequences of slab breakoff on orogenic wedge tectonics(2011-05)
; ; ; ; ; ;Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Rio, D.; Dipartimento di Geologia, Paleontologia e Geofisica, Università di Padova, Via Giotto 1, 35137 Padua, Italy ;Fornaciari, E.; Dipartimento di Geologia, Paleontologia e Geofisica, Università di Padova, Via Giotto 1, 35137 Padua, Italy ;Consolaro, C.; Dipartimento di Geologia, Paleontologia e Geofisica, Università di Padova, Via Giotto 1, 35137 Padua, Italy; ; ; ; In the past few years, a wealth of paleomagnetic data gathered from Neogene sediments consistently showed that since ca. 10 Ma the Calabria terrane coherently drifted ~500 km ESE-ward from the Sardinian margin, and rotated 15 –20 clockwise (CW) as a rigid microplate between 2 and 1 Ma. Here we report on a high-resolution paleomagnetic investigation of the Crotone forearc basin of northern Calabria. The integrated calcareous plankton biostratigraphy indicates early Pliocene (Zanclean) to late early Pleistocene (Calabrian) ages for 29 successful paleomagnetic sites and/or sections. Unexpectedly, four domains undergoing distinct rotations are documented. Two blocks have undergone a CW rotation statistically undistinguishable, for both timing and magnitude, from the rigid Calabria rotation documented in the past. Two additional ~10-km-wide blocks yielded a 30.8 ± 22.5 and 32.0 ± 9.2 post–1.2 Ma counterclockwise rotation, likely due to left-lateral shear along two NW-SE fault zones. We infer that since advanced early Pleistocene times, after the end of the uniform CW rotation, left-lateral strike-slip tectonics disrupted the Calabria terrane, overwhelming a widespread extensional regime accompanying the Calabria drift since late Miocene times. Seismological evidence reveals that only the southern part of the Ionian slab subducting below Calabria is continuous, while beneath northern Calabria a slab window between 100 and 200 km depth is apparent. We suggest that the partial breakoff of the Ionian slab after 1 Ma induced the fragmentation of the Calabria wedge, and that strike-slip faults from the Crotone basin decoupled “inactive” northern Calabria from southern Calabria, still drifting towards the trench.220 33 - PublicationRestrictedAn early Eocene carbon cycle perturbation at ~52.5 Ma in the Southern Alps: Chronology and biotic response(2009-05-14)
; ; ; ; ; ; ; ; ; ; ;Agnini, C.; Dipartimento di Geoscienze, Università di Padova, Padua, Italy ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Backman, J.; Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden ;Brinkhuis, H.; Palaeoecology, Laboratory of Palaeobotany and Palynology, Institute of Environmental Biology, Utrecht University, Utrecht, Netherlands ;Fornaciari, E.; Dipartimento di Geoscienze, Università di Padova, Padua, Italy ;Giusberti, L.; Dipartimento di Geoscienze, Università di Padova, Padua, Italy ;Luciani, V.; Dipartimento di Scienze della Terra, Polo Scientifico Tecnologico, Università di Ferrara, Ferrara, Italy ;Rio, D.; Dipartimento di Geoscienze, Università di Padova, Padua, Italy ;Sluijs, A.; Palaeoecology, Laboratory of Palaeobotany and Palynology, Institute of Environmental Biology, Utrecht University, Utrecht, Netherlands ;Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; At least two transient events of extreme global warming occurred superimposed on the long-term latest Paleocene and early Eocene warming trend in the Paleocene-Eocene thermal maximum (PETM) (or ETM1 ~55.5 Ma) and the Elmo (or ETM2 ~53.6 Ma). Other than warmth, the best known PETM is characterized by (1) significant injection of 13C-depleted carbon into the ocean-atmosphere system, (2) deep-sea carbonate dissolution, (3) strong biotic responses, and (4) perturbations of the hydrological cycle. Documentation of the other documented and suspected "hyperthermals" is, as yet, insufficient to assess whether they are similar in nature to the PETM. Here we present and discuss biomagnetostratigraphic data and geochemical records across two lower Eocene successions deposited on a continental margin of the western Tethys: the Farra and Possagno sections in the Venetian pre-Alps. We recognize four negative carbon isotope excursions within chron C24. Three of these shifts correlate to known or suspected hyperthermals: the PETM, the Eocene thermal maximum 2 (~53.6 Ma), and the informally named "X event" (~52.5 Ma). The fourth excursion lies within a reverse subchron and occurred between the latter two. In the Farra section, the X event is marked by a ~0.6% negative carbon isotope excursion and carbonate dissolution. Furthermore, the event exhibits responses among calcareous nannofossils, planktic foraminifera, and dinoflagellates that are similar to, though less intense than, those observed across the PETM. Sedimentological and quantitative micropaleontological data from the Farra section also suggest increased weathering and runoff as well as sea surface eutrophication during this event.365 36 - PublicationRestrictedThe lower to Middle Pleistocene Valle di Manche section (Calabria, Southern Italy): State of the art and current advances(2015-01-02)
; ; ; ; ;Capraro, L.; Dipartimento di Geoscienze, Università di Padova ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Scarponi, D.; Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Bologna ;Rio, D.; Dipartimento di Geoscienze, Università di Padova; ; ; The Valle di Manche (VdM) section represents one of the best-documented on-land marine records of the Early to Middle (E/M) Pleistocene transition available to date. Accordingly, the VdM succession is among the few appropriate candidates to host the GSSP of the Middle Pleistocene (“Ionian”) Stage. In particular, the VdM section uniquely documents the Matuyama-Brunhes magnetic reversal (mid-MIS 19), which is agreed to be the main criterion for defining the chronostratigraphic position of the base of the Middle Pleistocene. The section also yields a wide range of chronological, paleoclimatic and stratigraphic data sets that allow long-distance correlation with both marine and terrestrial reference records. Notably, the stratigraphy across the MIS 19 interglacial is greatly expanded, permitting a precise and detailed investigation of this critical interval. The section is also easy to reach, and fortunately the exposure is destined to persist. Therefore, the section fulfills the essential requirements to host the GSSP for the “Ionian” Stage and Middle Pleistocene Subseries. We suggest that the GSSP be placed at the base of the “Pitagora ash”, a prominent bed that occurs in mid-MIS 19, close to the MatuyamaeBrunhes magnetic reversal. Here, we present and discuss scientific information gathered in the past two decades, and give a preliminary account of the work to which we are presently committed, that aims at improving our knowledge on the VdM section.359 81