Paleomagnetic evidence for counter-clockwise rotations in the Southern Apennines fold-and-thrust belt during the late pliocene and middle Pleistocene

Scheepers, P.J.J.; Langereis, C.G.

doi:10.1016/0040-1951(94)90106-6

Cited by 35 publications

(22 citation statements)

References 21 publications

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“…These data imply that at least part of the CCW rotation is younger than 0.78 Ma. Similar fast and young tectonic rotations are being increasingly reported from di¡erent regions of the Mediterranean area [4,27,28].…”

Section: Discussionmentioning

confidence: 65%

“…core were selected for a pilot study: one was subjected to stepwise thermal demagnetization (steps 20, 120, 180, 220, 260, 300, 340, 380, 420³C), the other to stepwise AF demagnetization (steps 0, 5,10,15,20,25,30,40,50,60,80, 100 mT). AF demagnetization was achieved on the 2G system, with three orthogonal demagnetization coils in line with the cryogenic magnetometer.…”

Section: Sampling and Measurementsmentioning

confidence: 99%

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Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)

Sagnotti

Winkler

Alfonsi

et al. 2000

Earth and Planetary Science Letters

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We report on new paleomagnetic results obtained from 27 sites sampled in the Plio^Pleistocene sequences at the external front of the central^northern Apennines. Previous analyses of Miocene (Messinian) sediments indicated that the present shape of the northern Apenninic arc is due to the oroclinal bending of an originally straight belt oriented around N320³ and that vertical axis rotations accompanied the migration of the thrust fronts toward the Adriatic foreland [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153^3166]. We tried to provide new paleomagnetic constraints for the timing and rates of the oroclinal bending process during the Pliocene and the Pleistocene. The results suggest that CCW rotations observed in the northern part of the studied area are possibly younger than 3 Ma. No regional rotation is recorded in the Pliocene and Pleistocene sediments from the southern part of the study area, analogously to the Messinian sediments of the`Acquasanta' domain of Speranza et al. [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153^3166]. A local significant CCW rotation (23³ þ 10³) is identified in the Early Pleistocene sediments that crop out along the Adriatic coast between Ascoli and Pescara, indicating differential motion of the thrust sheets. This rotation must be younger than 1.43 Ma. ß

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Section: Discussionmentioning

confidence: 65%

Section: Sampling and Measurementsmentioning

confidence: 99%

Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)

Sagnotti

Winkler

Alfonsi

et al. 2000

Earth and Planetary Science Letters

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“…Rotations attributable to landslides have, at least locally, significantly complicated the story (Catalano et al 1984;Grasso et al 1983;Incoronato & Nardi 1989). Significant rotation of Pleistocene rocks (Scheepers & Langereis 1994) indicates that bend formation is ongoing. Contrary to the palaeomagnetic data, geodetic data imply fairly uniform northward movement, at rates of .5 mm a 21 , of the Apennine -Sicilian thrust belt (also referred to as Apulia) relative to a fixed Eurasian block around the length of the Calabrian orocline ( Fig.…”

Section: The Apennine-sicilian Fold-and-thrust Beltmentioning

confidence: 99%

The Calabrian Orocline: buckling of a previously more linear orogen

Johnston

Mazzoli

2009

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Recent structural studies of the Apennines and the Calabrian orocline and a compilation of structural, stratigraphic, GPS and palaeomagnetic data from the central and western Mediterranean region show that beginning in the Late Miocene a N-S trending ribbon continent that had been previously deformed, and which we now recognize as the Apennine-Sicilian thrust belt, buckled eastward in response to northward movement of Africa relative to stable Europe. A simple geometric model is consistent with available data and shows how eastward buckling of an originally north-south continental beam explains: (1) opening of the Tyrrhenian Sea basin from 7 -2 Ma, at which point sea-floor spreading ceases and the basin begins to shrink by southward subduction beneath Sicily; (2) the coeval development of an east-verging fold-andthrust belt along the length of the Apennine-Sicilian belt in response to overthrusting of the autochthon to the east, followed by extension beginning at 1 Ma as the Apennine portion of the beam begins to retreat to the SW; and (3) subduction of continental and oceanic lithosphere east of the buckling beam into a trench that migrates eastward through time due to 'push back' by the buckling upper plate.

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“…The latter led to a pile of thrust sheets of the Apenninic carbonate platform and encasing basinal sediments (Casero et al, 1988;Mazzoli et al, 2001). Following the opening of the Tyrrhenian backarc basin during the Miocene, the pile of thrust sheets rotated counterclockwise (Scheepers and Langereis, 1994;Gattacceca and Speranza, 2002), and was ultimately thrust onto the Apulian Carbonate Platform, the undeformed part of which represents the foreland of the Southern Apennines Fold-andthrust Belt (Doglioni, 1994;Argnani, 2005). Smith et al, 1994; palinspastic map of the Tethyan realm redrawn and modified from Danelian et al, 2004, andMasse et al, 2004, redrawn andsimplified) and location of the studied sections (from Bonardi et al, 1992 Wortmann et al, 1999).…”

Section: Geological Settingmentioning

confidence: 99%

Shallow water carbonate platforms (Late Aptian–Early Albian, Southern Apennines) in the context of supraregional to global changes: re-appraisal of palaeoecological events as reflectors of carbonate factory response

Raspini

2012

Solid Earth

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Abstract. This paper discusses the palaeoenvironmental significance of the "Orbitolina Level", the microbial carbonates and the Salpingoporella dinarica-rich deposits encased in the Aptian/Albian shallow water carbonate platform strata of Monte Tobenna and Monte Faito (Southern Italy). These facies show a peculiar field appearance due to their color and/or fossil content. In the shallow water carbonate strata, the Late Aptian "Orbitolina Level" was formed during a period of decreasing accommodation space. Microbial carbonates occur in different levels in the composite section. They reach their maximum thickness around the sequence boundaries just above the "Orbitolina Level" and close to the AptianAlbian transition, and were not deposited during maximum flooding. S. dinarica-rich deposits occur in the lower part of the Monte Tobenna-Monte Faito composite section, in both restricted and more open lagoonal sediments. S. dinarica has its maximum abundance below the "Orbitolina Level" and disappears 11 m above this layer.On the basis of δ 13 C and δ 18 O values recorded at TobennaFaito, the succession has been correlated to global sea-level changes and to the main volcanic and climatic events during the Aptian. Deterioration of the inner lagoon environmental conditions was related to high trophic levels triggered by volcano-tectonic activity. Microbial carbonates were deposited especially in periods of third-order sea level lowering. In such a scenario, periods of increased precipitation during the Gargasian induced the mobilization of clay during flooding of the exposed platform due to high-frequency sea-level changes, with consequent terrigenous input to the lagoon. This and the high nutrient levels made the conditions unsuitable for the principle carbonate producers, and an opportunistic biota rich in orbitolinids (Mesorbitolina texana and M. parva) populated the platform. In the more open marine domain, the increased nutrient input enhanced the production of organic matter and locally led to the formation of black shales (e.g. the Niveau Fallot in the Vocontian Basin).It is argued that the concomitant low Mg/Ca molar ratio and high concentration of calcium in seawater could have favoured the development of the low-Mg calcite skeleton of the S. dinarica green algae.During third-order sea-level rise, no or minor microbial carbonates formed in the shallowlagoonal settings and S. dinarica disappeared. Carbonate neritic ecosystems were not influenced by the environmental changes inferred to have been induced by the mid-Cretaceous volcanism.The "Orbitolina Level", the microbial carbonates and the Salpingoporella dinarica-rich deposits in the studied Aptian/Albian shallow water carbonate strata are interpreted to be the response to environmental and oceanographic changes in shallow-water and deeper-marine ecosystems.

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Paleomagnetic evidence for counter-clockwise rotations in the Southern Apennines fold-and-thrust belt during the late pliocene and middle Pleistocene

Cited by 35 publications

References 21 publications

Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)

Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)

The Calabrian Orocline: buckling of a previously more linear orogen

Shallow water carbonate platforms (Late Aptian–Early Albian, Southern Apennines) in the context of supraregional to global changes: re-appraisal of palaeoecological events as reflectors of carbonate factory response

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