Paleomagnetic Evidence for Tertiary Counterclockwise Rotation of Adria With Respect to Africa

Márton, Emő

doi:10.1007/1-4020-4235-3_05

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…Thus, the youngest, counter‐clockwise rotation of the present study fits very well to this pattern (Fig. 9): it is yet one more evidence that a large area was involved in a rotation most likely induced by counter‐clockwise rotating Adria (Márton et al 2003; Márton 2006). As these observations show, the Pohorje Mountains rotated clockwise prior to their counter‐clockwise rotation.…”

Section: Discussionsupporting

confidence: 81%

Formation, uplift and tectonic integration of a Periadriatic intrusive complex (Pohorje, Slovenia) as reflected in magnetic parameters and palaeomagnetic directions

Márton¹,

Trajanova

Zupančič

et al. 2006

Geophysical Journal International

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S U M M A R YThe Periadriatic lineament is a 700-km-long, first-order tectonic boundary in the Alps, along which several Tertiary intrusions are located that were emplaced while tectonic processes were active. The Pohorje pluton is one of the Periadriatic magmatic suites and comprises a pluton and a dacite stock that were emplaced at depths of about 10 and 2 km, respectively. Oriented samples were collected from 33 sites in the magmatic, and three in the surrounding metamorphic rocks and subjected them to standard palaeomagnetic and magnetic susceptibility anisotropy processing. There is extreme variation in susceptibility (although the magnetic mineral are always magnetite) and in its anisotropy within the pluton. Lowest values are in the mafic members (in the gabbro, the oldest and in some lamprophyres, the youngest member of the plutonic suite), while the tonalite (granodiorite) exhibits extreme variation, far exceeding those observed for other Periadriatic plutons. The 'abnormality' of the Pohorje pluton is attributed to the complex history that involves assimilation, fractional crystallization, stratification in the magma chamber, incorporation of wall rocks, variable degree of K-metasomatism and hydrothermal alteration. Despite the above-described heterogenities and sometimes very high degree of susceptibility anisotropy (much higher that in the metamorphic samples) in the acid member, the palaeomagnetic directions observed for the pluton define three clear-cut groups. The directions show no dependence on the degree of magnetic susceptibility anisotropy. In the order of crystallization, they exhibit decreasing degree of clockwise declination deviation from north. The dacite stock is characterized by counter-clockwise rotated declinations. As the Pohorje pluton was uplifted very fast within the right-lateral Periadriatic shear zone system, it is interpreted that the palaeomagnetic directions observed for the pluton are evidence for a clockwise rotation during exhumation. The palaeomagnetic directions for the dacite, which formed after the climax of the external forces, fits the regional pattern of counter-clockwise rotation observed in the Neogene sediments around the Pohorje pluton. This shows that by the time of the dacite intrusion, the Pohorje pluton was already incorporated into the 'block' that was driven by counter-clockwise rotated Adriatic microplate.

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Section: Discussionsupporting

confidence: 81%

Formation, uplift and tectonic integration of a Periadriatic intrusive complex (Pohorje, Slovenia) as reflected in magnetic parameters and palaeomagnetic directions

Márton¹,

Trajanova

Zupančič

et al. 2006

Geophysical Journal International

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“…The NE‐trending Magnaghi‐Sebeto lineament includes numerous faults, which are the conjugated system of the NW‐SE structures active during the Apenninic orogenic phase. These fault zones were reactivated during the rifting process related to the kinematics of three blocks: (1) the rollback of the sinking Ionian lithosphere [ Gvirtzman and Nur , 2001 and references therein]; (2) the opening of the Tyrrhenian Sea [ Acocella et al , 1999; D'Argenio et al , 1973; Doglioni , 1991; Finetti and Del Ben , 1986; Hippolyte et al , 1994; Ippolito et al , 1975; Scandone , 1979; Spadini and Wezel , 1979; Sartori et al , 2001]; and (3) the counterclockwise rotation (divergence) of the Adriatic microplate and Southern Apennines [ van Dijk and Scheepers , 1995; Marton et al , 2003].…”

Section: Discussionmentioning

confidence: 99%

Relative roles of rifting tectonics and magma ascent processes: Inferences from geophysical, structural, volcanological, and geochemical data for the Neapolitan volcanic region (southern Italy)

Piochi

Bruno

Astis

2005

Geochem Geophys Geosyst

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[1] The Neapolitan volcanic region is located within the graben structure of the Campanian Plain (CP), which developed between the western sector of the Appenine Chain and the eastern margin of the Tyrrhenian Sea. Two volcanic areas, spaced less than 10 km apart, are situated within the CP: the SommaVesuvius Volcano (SVV) and the Phlegraean Volcanic District (PVD). SVV is a typical stratovolcano, whereas PVD, including Campi Flegrei, Procida, and Ischia, is composed mostly of monogenetic centers. This contrast is due to different magma supply systems: a widespread fissure-type system beneath the PVD and a central-type magma supply system for the SVV. Volcanological, geophysical, and geochemical data show that magma viscosity, magma supply rate, and depth of magma storage are comparable at PVD and SVV, whereas different structural arrangements characterize the two areas. On the basis of geophysical data and magma geochemistry, an oblique-extensional tectonic regime is proposed within the PVD, whereas in the SVV area a compressive stress regime dominates over extension. Geophysical data suggest that the area with the maximum deformation rate extends between the EW-running 41st parallel and the NE-running Magnaghi-Sebeto fault systems. The PVD extensional area is a consequence of the Tyrrhenian Sea opening and is decoupled from the surrounding areas (Roccamonfina and Somma-Vesuvius) which are still dominated by Adriatic slab dynamics. Spatially, we argue that the contribution of the asthenospheric wedge become much less important from W-NW to E-SE in the CP. The development of the two styles of volcanism in the CP reflects the different tectonic regimes acting in the area.Components: 15,031 words, 9 figures, 1 table.

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“…Battaglia et al (2004) andD'Agostino et al (2008) envisage two Adriatic microplates (with different geometries) both moving independently from Africa and Eurasia. Other hypotheses about the Tertiary kinematics of the Adriatic plate have been proposed on the basis of paleomagnetic data (e.g., Marton et al, 2003). In previous papers (Mantovani, 2005;Mantovani et al, 2006aMantovani et al, , 2009 we have argued that to plausibly account for the complex space distribution of major late Tertiary tectonic events in the Central Mediterranean region it is necessary to suppose that a large block (hereafter referred to as Adria plate), encompassing the Adriatic continental domain, the northern Ionian zone and the Hyblean-Adventure block ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Plate kinematics and geodynamics in the Central Mediterranean

Viti

Mantovani

Babbucci

et al. 2011

Journal of Geodynamics

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Paleomagnetic Evidence for Tertiary Counterclockwise Rotation of Adria With Respect to Africa

Cited by 12 publications

References 17 publications

Formation, uplift and tectonic integration of a Periadriatic intrusive complex (Pohorje, Slovenia) as reflected in magnetic parameters and palaeomagnetic directions

Formation, uplift and tectonic integration of a Periadriatic intrusive complex (Pohorje, Slovenia) as reflected in magnetic parameters and palaeomagnetic directions

Relative roles of rifting tectonics and magma ascent processes: Inferences from geophysical, structural, volcanological, and geochemical data for the Neapolitan volcanic region (southern Italy)

Plate kinematics and geodynamics in the Central Mediterranean

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