Escape models of the Alpine‐Carpathian‐Pannonian region in the light of palaeomagnetic observations

Mauritsch, Hermann Johann; Márton, Emő

doi:10.1111/j.1365-3121.1995.tb00666.x

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…10. Although unusual, the occurrence of reverse polarities seen here (J3 component) and in previous data [ Channell et al , 1990, 1992; Gallet et al , 1993, 1994, 1996, 1998; Mauritsch and Marton , 1995] may support the primary character of the high‐temperature component (J1). However, significant fold tests are hard to obtain in the area due to the small dip changes and therefore the primary character it is difficult to prove unambiguously.…”

Section: Resultssupporting

confidence: 83%

New evidence for block and thrust sheet rotations in the central northern Calcareous Alps deduced from two pervasive remagnetization events

Pueyo¹,

Mauritsch

Gawlick

et al. 2007

Tectonics

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[1] We present 81 paleomagnetic sites (Early Triassic to Early Cretaceous) from the central sector of the northern Calcareous Alps (NCA, Eastern Alps, Austria and Germany). Stepwise thermal demagnetization defines three magnetic directions mostly carried by low unblocking temperature and low-coercivity minerals: J3, 350°; J2, 500°; J1, 575°and 680°. J3 and J2 show positive inclinations, whereas J1 (very seldom) is of dual polarity. The fold tests show that a J3 can be interpreted as a postfolding and posttilting remagnetization and J2 as a postfolding and pre(syn)tilting. J1 can be considered as primary because of the occurrence of two polarities and evidence presented by other authors in the area. All three components show a systematic and significant clockwise rotation after comparing with the expected European references. J2 or J1 are marked by higher rotation values than J3. J2 shows different inclinations depending on the structural position (north or southward dips). Considering the structural evolution and the observed inclinations, the first postfolding and pretilting remagnetization event (J2) could have taken place between Late Cretaceous and Eocene times but certainly before the thrusting of the NCA over the Rhenodanubian Flysch and northward tilting caused by the stacking of the lower Austroalpine nappes. The second postfolding and posttilting remagnetization (J3) would have been acquired after the final thrusting of the NCA over Penninic units. From then, the NCA behaved as a set of rigid blocks recording the main stage of vertical axis clockwise rotation (65°in average) associated with the continental collision. The variable degree of rotation in the different positions (from 40°to 134°) can be explained by individual vertical axis rotation in a block system trying to adjust to space problems. The constant declination differences between J2 and J3 (25°in average) would reflect the rotation related with the lateral differences of shortening during the oblique thrust of the Austroalpine units over the Penninic units.

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Section: Resultssupporting

confidence: 83%

New evidence for block and thrust sheet rotations in the central northern Calcareous Alps deduced from two pervasive remagnetization events

Pueyo¹,

Mauritsch

Gawlick

et al. 2007

Tectonics

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“…In the regional context of the Alps–Pannonian–Carpathian system, the new palaeomagnetic results are also significant, since they undermine a strong argument for the juxtaposition of the Transdanubian Central Range and the Northern Calcareous Alps throughout the Mesozoic, as was suggested by Balla (1988). Late Jurassic–early Cretaceous palaeomagnetic results Mauritsch & Márton 1995), as well as the results of the present study, suggest that a direct tectonic connection between the Transdanubian Range and the Northern Calcareous Alps after the Triassic is unlikely.…”

Section: Discussionsupporting

confidence: 79%

The bending model of the Transdanubian Central Range (Hungary) in the light of Triassic palaeomagnetic data

Márton¹

1998

Geophysical Journal International

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In the Carpatho–Pannonian region, the Transdanubian Central Range is the second largest unit with changing strike along the SW–NE‐trending Mesozoic sequence. This structure was tested palaeomagnetically for oroclinal bending with the help of Triassic data, most of them derived from widespread platform carbonates. Based on nearly 700 samples, it was possible to obtain a statistically well‐defined overall mean palaeomagnetic direction for a Werfenian–early Carnian age group in the western part of the Range, and a different direction for a late Carnian–Rhaetian age group, extending over the whole length of the Range. These two mean directions are D=316°, I=38° (k=70, α95=8°, n=9) and D=292°, I=57° (k=31, α95=10°, n=10), respectively. The statistical parameters of these overall mean palaeomagnetic directions are comparable to those characterizing rigid areas. Nevertheless, an attempt was made to correlate the tectonic trend and palaeomagnetic declination, which lead to rejecting the model of oroclinal bending. However, it was possible to separate the late Carnian–Rhaetian sampling localities into a western (west of Lábatlan) and an eastern group, each of them with a statistically good overall mean direction: D=312°, I=56° (k=139, α95=6°, n=5) for the western, and D=273°, I=54° (k=51, α95=11°, n=5) for the eastern segment. The good agreement of the mean inclinations, together with an approximately 40° difference in mean declinations indicates that the Transdanubian Central Range east of Lábatlan has undergone a greater counterclockwise rotation than the western part; i.e. there is a ‘break’ in the Transdanubian Central Range between Lábatlan and Dorog (at the Tertiary Dorog Basin). Thus, the relative rotation between the western and eastern segments is in the opposite sense to that required by oroclinal bending.

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“…Paleomagnetic data also indicate a pre‐Miocene position of the North Pannonian block a few hundred kilometers south of the recent position [ Márton et al , 1999]. This Miocene northeastward translation of the North Pannonian block is accompanied by counterclockwise rotations of up to 90° since Eocene [e.g., Mauritsch and Márton , 1995; Márton et al , 1999]. Both movements together serve as first‐order constraints for possible tectonic models explaining the tectonic evolution of the North Pannonian block.…”

Section: Discussionmentioning

confidence: 99%

Interplay between subduction retreat and lateral extrusion: Tectonics of the Western Carpathians

2002

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Analysis of brittle microstructures reveals three Tertiary deformation events in the Western Carpathians: (1) Late Paleogene bedding‐parallel extension; (2) Oligocene (?) to middle Miocene NNE‐SSW compression and ESE‐WNW extension; (3) post‐mid‐Miocene NW‐SE extension. These regional deformations, applied to crustal blocks in the intra‐Carpathian region, resulted from forces which were induced by the coupled plate tectonic processes of subduction retreat beneath the Carpathian arc and lateral extrusion from the Eastern Alps toward the Carpathian region. Material flow from the Alps spread toward east and NE, guided by sinistral strike‐slip zones along the NE trending continental margin. Subduction retreat was terminated by mid‐Miocene “soft” collision of the Inner Western Carpathians with the European foreland. Ongoing subduction retreat beneath the Eastern Carpathians caused post‐mid‐Miocene back arc extension forming the Pannonian basin. Extension spread into the Western Carpathians by reactivating the extrusion‐related strike‐slip faults as normal faults.

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Escape models of the Alpine‐Carpathian‐Pannonian region in the light of palaeomagnetic observations

Cited by 19 publications

References 16 publications

New evidence for block and thrust sheet rotations in the central northern Calcareous Alps deduced from two pervasive remagnetization events

New evidence for block and thrust sheet rotations in the central northern Calcareous Alps deduced from two pervasive remagnetization events

The bending model of the Transdanubian Central Range (Hungary) in the light of Triassic palaeomagnetic data

Interplay between subduction retreat and lateral extrusion: Tectonics of the Western Carpathians

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