Deformation of sediments in the post-orogenic Intra-Carpathian Paleogene Basin as indicated by magnetic anisotropy

Hrouda, František; Potfaj, Michal

doi:10.1016/0040-1951(93)90042-i

Cited by 13 publications

(11 citation statements)

References 18 publications

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“…It is interpreted to result from the combination of an initial sedimentary-compactional fabric and a later secondary tectonic fabric induced by a mild deformation process. Such a fabric is similar to that found in apparently undeformed or weakly deformed Tertiary sediments of the orogenic belts in the northwestern Greece, Taiwan, the west Carpathians, the western Taurus of Turkey and the northern Apennines of Italy with compressive tectonic setting (Kissel et al, 1986;Lee et al, 1990;Hrouda and Potfaj, 1993;Aubourg et al, 1997;Sagnotti et al, 1998).…”

Section: Principal Ams Directionssupporting

confidence: 76%

Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

et al. 2014

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Sandstones and siltstones collected from the Siwalik molasse sequence (∼16 to 5 Ma) of the Karnali river section have been studied for their magnetic properties. Behavior of the specimens during demagnetization (of the NRM and IRM) and magnetic susceptibility vs. temperature data suggest that goethite, maghemite/magnetite, and hematite are the main magnetic minerals in the section. Goethite, carrying a recent component, is the dominant magnetic mineral in the fine-grained lithologies from the lower part. Maghemite and magnetite, which also carry a secondary remanence, occur in the sandstones from the upper part. Hematite, mainly of detrital origin, is present in the whole sequence. The magnetic fabric is defined by mainly oblate AMS ellipsoids and a low degree of anisotropy (P < 1.20). The magnetic lineations (declinations: 75• -130• or 245• -310• ; peak orientation: 290• /2.8 • ) are subparallel to the fold axes/bedding strikes/thrust fronts (WNW-ESE). The initial sedimentary-compactional fabric has been overprinted by a secondary tectonic fabric, which was probably induced by mild deformation active in the compressive tectonic setting.

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Section: Principal Ams Directionssupporting

confidence: 76%

Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

et al. 2014

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“…In contrast, deposition from medium-concentrated suspension generates very oblate (nearly rotational) susceptibility ellipsoids with magnetic foliation dipping <15 towards the origin of flow. In this case, the magnetic lineation tends to be perpendicular to the direction of flow (Hrouda and Potfaj, 1993;Rees, 1983).…”

Section: Development Of Fabric During Deposition Diagenesis and Mildmentioning

confidence: 99%

“…Such fabric has been reported from apparently undeformed or weakly deformed Paleogene and Neogene sediments in orogenic belts in Northwest Greece, Taiwan, West Carpathians, western Taurus in Turkey and northern Apennines of Italy (Kissel et al, 1986;Lee et al, 1990;Hrouda and Potfaj, 1993;Aubourg et al, 1997;and Sagnotti et al, 1998). AMS may be used to define the "true" shortening direction arising from the layer-parallel shortening resulting from pure shear that affects the whole sedimentary pile in external fold-thrust belts before folding, when the folds are oblique to the main tectonic transport direction (Aubourg et al, 1997).…”

Section: Contrasting Ams Fabrics In Compressive and Extensional Settingsmentioning

confidence: 99%

Depositional chronology and fabric of Siwalik group sediments in Central Nepal from magnetostratigraphy and magnetic anisotropy

Gautam

Rösler

1999

Journal of Asian Earth Sciences

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Magnetostratigraphic research, undertaken within the past 15 years in the Siwaliks distributed along 400 km of the Sub-Himalaya in central Nepal, has proved that the sediments possess highly reliable hematite-based primary detrital remanent magnetization suitable to determine depositional chronology. In order to bring out the polarity sequences in a common chronological frame, all available data are newly correlated to the latest global magnetic polarity time scale of Cande and Kent (1995). Chronological data presented are referred in relation to the diverse lithological nomenclature to the formations whose ages are not constrained by isotopic or paleontologic ages. The age of the sections dated by magnetostratigraphy ranges between 14 and <2 Ma. Sediment accumulation rates average to 32-50 cm kyr -1 . Rock-magnetic parameters, e.g. initial susceptibility and isothermal remanent magnetization ratios, allow correlation with an accuracy of up to a few hundred meters among several kilometers thick adjacent sections.Anisotropy of magnetic susceptibility (AMS) data reveal a well-defined fabric contributed by paramagnetic (k = 10 -5 to 3x10 -4 SI) as well as ferromagnetic minerals (k = 3x10 -4 to 10 -2 SI). AMS ellipsoids are mainly oblate along with prolate ones and the degree of anisotropy is mostly low (P"<1.2). The magnetic fabric is of pre-folding origin with tiltcorrected sub-vertical magnetic foliation poles. The magnetic lineations do not show parallelism to the expected paleocurrent directions. Rather, sub-parallelism between the clusters of magnetic lineation and the fold axes/bedding strikes/thrust fronts is observed. A superimposed fabric consisting of a sedimentary-compactional and an overprint induced by mild deformation process is suggested. The latter process was active during and subsequent to the deposition in the compressive tectonic setting of the foreland basin. The magnetic lineations for Tinau Khola and Surai Khola sections cluster around N80W and N88W respectively, whereas N27W trend characterizes the Amiliya-Tui area south of Dang. The peak clusters in lineations are probably orthogonal to the true shortening axes. Their variation along the Sub-Himalaya, together with the fold axes or thrust front trends, may be used for accurate tectonic reconstruction. It is especially important when orthogonality of the latter to the shortening axes may not hold true in the sectors with imbricate fold-and-thrust structures.

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“…Its southern part has shown a considerable tectonic contribution to the magnetic fabric, partly due to weak compaction and cementation of sediments. In turn, the rocks of the Skorušina foothills adjacent to the Orava Basin have revealed sedimentary or weakly deformed AMS fabric resulting from NW-SE shortening (Hrouda & Potfaj 1993). Such a trend corresponds well with NE-trending magnetic lineations within the neighbouring area of the Magura Unit representing relatively weakly deformed rocks and interpreted as a tectonically passive element during folding and thrusting (Hrouda et al 2009;Márton et al 2009).…”

Section: The Evolution Of the Orava Basinmentioning

confidence: 83%

“…The application of the AMS method in orogeny-related basins and accretionary prisms predominantly concerns a structural interpretation of strain directions (e.g., Hrouda & Potfaj 1993;Parés et al 1999;Kanamatsu & Herrero-Bervera 2006;Hrouda et al 2009;Mazzoli et al 2012) and turbidity current directions (e.g., Tamaki et al 2015), while hemipelagic and pelagic sediments are examined for the occurrence and directions of bottom currents (e.g., Ellwood & Ledbetter 1977;Shor et al 1984;Joseph et al 1998;Park et al 2000;Baas et al 2007;Parés et al 2007). The sedimentological analysis supported by AMS measurements has also been done in a variety of sedimentary settings, namely: deep sea fans and turbidity deposits (von Rad 1970), deep-sea mass transport deposits (Novak et al 2014), alluvial fine-grained sediments (Garcés et al 1996;Park et al 2013), pyroclastic density currents and lahar deposits (Biró et al 2015;Ort et al 2015), as well as glacial sediments (Eyles et al 1987;Gravenor & Wong 1987).…”

Section: Introductionmentioning

confidence: 99%

Tectono-sedimentary analysis using the anisotropy of magnetic susceptibility: a study of the terrestrial and freshwater Neogene of the Orava Basin

Łoziński¹,

Ziółkowski²,

Wysocka³

2017

Geologica Carpathica

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Abstract:The Orava Basin is an intramontane depression filled with presumably fine-grained sediments deposited in river, floodplain, swamp and lake settings. The basin infilling constitutes a crucial record of the neoalpine evolution of the Inner/Outer Carpathian boundary area since the Neogene, when the Jurassic-Paleogene basement became consolidated, uplifted and eroded. The combination of sedimentological and structural studies with anisotropy of magnetic susceptibility (AMS) measurements provided an effective tool for recognition of terrestrial environments and deformations of the basin infilling. The lithofacies-oriented sampling and statistical approach to the large dataset of AMS specimens were utilized to define 12 AMS facies based on anisotropy degree (P) and shape (T). The AMS facies allowed a distinction of sedimentary facies ambiguous for classical methods, especially floodplain and lacustrine sediments, as well as revealing their various vulnerabilities to tectonic modification of AMS. A spatial analysis of facies showed that tuffites along with lacustrine and swamp deposits were generally restricted to marginal and southern parts of the basin. Significant deformations were noticed at basin margins and within two intrabasinal tectonic zones, which indicated the tectonic activity of the Pieniny Klippen Belt after the Middle Miocene. The large southern area of the basin recorded consistent N-NE trending compression during basin inversion. This regional tectonic rearrangement resulted in a partial removal of the southernmost basin deposits and shaped the basin's present-day extent.

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Deformation of sediments in the post-orogenic Intra-Carpathian Paleogene Basin as indicated by magnetic anisotropy

Cited by 13 publications

References 18 publications

Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal

Depositional chronology and fabric of Siwalik group sediments in Central Nepal from magnetostratigraphy and magnetic anisotropy

Tectono-sedimentary analysis using the anisotropy of magnetic susceptibility: a study of the terrestrial and freshwater Neogene of the Orava Basin

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