Magnetic anisotropy of clayey and silty members of tertiary flysch from the Silesian and Skole nappes (Outer Carpathians)

E. Márton, Balázs Bradák, Marta Rauch-Włodarska, Antek K. Tokarski

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

AMS studies earlier carried out on the flysch sediments from the Outer Western Carpathians focused on the sandstone members deposited from turbidity currents. The main conclusion of these studies was that the dominant features of the AMS fabric developed during sedimentation and the tectonic overprint was weak. In recent years a large number of claystone (deposited also from turbidity currents, but in calm water) localities were sampled from the Krosno beds of the Silesian nappe, primarily for paleomagnetic study. Nevertheless, the AMS of the samples was also measured. The magnetic fabrics of the claystones were dominated by foliation, but lineations were also expressed and attributed to deformation. The question arose how different are the reactions of the claystone and the siltstone beds to deformation. Comparison was made between the upper, finest grained part of sandstone beds and claystones from the same outcrops of the Silesian nappe. It was found that the AMS ellipsoids for different lithologies were coaxial. The main difference was the higher degree of foliation in the claystones than in the siltstones which was attributed to stronger compaction in the former. Surprisingly, there was practically no difference in the degrees of lineation between the different lithologies from the same outcrop, suggesting that the siltstones and the intercalated claystones similarly react to tectonic deformation. Siltstone and claystone samples from a single outcrop from the Skole nappe behaved differently, since the siltstone had inverse fabric due to impregnation by siderite. It seems that the claystones of the flysch sequences, although technically more difficult to work with them, have advantages over the sandstones/siltstones when the goal of the AMS measurements is the study of deformation. One of the good aspects of the claystones is that their primary fabric is probably not or weakly oriented by paleocurrents. Therefore, the AMS lineation and the stress field orientation have a straightforward relation, while the sandstones often have a composite fabric, since it is the well developed flow oriented sedimentary fabric which is overprinted by deformation. The second is that the permeability of claystones is lower, thus secondary infiltration and impregnation by iron minerals dramatically influencing the orientation of the AMS fabric, as it was observed for the siltstones from a single locality from the Skole nappe, is practically impossible.

Original languageEnglish
Pages (from-to)121-134
Number of pages14
JournalStudia Geophysica et Geodaetica
Volume54
Issue number1
DOIs
Publication statusPublished - Mar 2010

Fingerprint

folds (geology)
Alpha Magnetic Spectrometer
magnetic anisotropy
Silesian
claystone
Magnetic anisotropy
flysch
nappe
accelerator mass spectrometry
siltstone
anisotropy
sandstones
Sandstone
outcrops
beds
Lithology
turbidity
lithology
lineation
Turbidity

Keywords

  • AMS
  • Clayey and sandy members
  • Inverse fabric
  • Siderite
  • Tertiary flysch

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Magnetic anisotropy of clayey and silty members of tertiary flysch from the Silesian and Skole nappes (Outer Carpathians). / Márton, E.; Bradák, Balázs; Rauch-Włodarska, Marta; Tokarski, Antek K.

In: Studia Geophysica et Geodaetica, Vol. 54, No. 1, 03.2010, p. 121-134.

Research output: Contribution to journalArticle

Márton, E. ; Bradák, Balázs ; Rauch-Włodarska, Marta ; Tokarski, Antek K. / Magnetic anisotropy of clayey and silty members of tertiary flysch from the Silesian and Skole nappes (Outer Carpathians). In: Studia Geophysica et Geodaetica. 2010 ; Vol. 54, No. 1. pp. 121-134.
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