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Magnetic fabrics of Tertiary sandstones from the Arc of Fars (Eastern Zagros, Iran)

Bakhtari, Hamid Reza and de Lamotte, Dominique Frizon and Aubourg, Charles and Hassanzadeh, Jamshid (1998) Magnetic fabrics of Tertiary sandstones from the Arc of Fars (Eastern Zagros, Iran). Tectonophysics, 284 (3-4). pp. 299-316. ISSN 0040-1951.

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An analysis of magnetic fabric (45 sites, 514 samples) has been performed in folded but apparently not penetratively deformed Mio-Pliocene sedimentary rocks (mainly sandstones) from the Arc of Fars (Eastern Zagros, Iran). Different types of magnetic fabrics and shapes of susceptibility ellipsoids were observed from an oblate form reflecting a sedimentary fabric to a prolate form signifying a magnetic lineation of tectonic origin. Classically in such weakly deformed sedimentary rocks the magnetic lineation is perpendicular to the shortening direction and is interpreted as recording a pre-folding layer-parallel shortening. In the studied area, the trends of the magnetic lineation show two clusters oriented ENE-WSW and WNW-ESE. To a first approximation, the magnetic lineation follows the bending of the fold trend. However, a quite systematic obliquity is observed. According to regional geology and to other considerations arising from the magnetic analysis, we consider that the tectonic transport direction is NNW-SSE. The arc pattern observed in the fold and magnetic lineation trends may result either from an inherited structural framework or from post-folding clockwise rotations or both. In any case, our data rule out any interpretation of the whole Arc of Fars as resulting from the superimposition of two non-coaxial folding events.

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Additional Information:© 1998 Elsevier Science B.V. Received 30 January 1997; accepted 14 July 1997. The authors wish to thank the Research Council of Tehran University for logistic and financial support during the field work, Dr. Javaherian Director of the Institute of Geophysics of Tehran University for his permanent help, and S. Zakariayi for his invaluable assistance in the field. H.R, Bakhtari acknowledges a grant from the Iranian government. Comments by two anonymous referees are gratefully acknowledged.
Funding AgencyGrant Number
University of Tehran Research CouncilUNSPECIFIED
Subject Keywords:fold-thrust belt; magnetic fabric; sandstone; weak deformation; Arc of Fars; Zagros (Iran)
Issue or Number:3-4
Record Number:CaltechAUTHORS:20130827-095258249
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Official Citation:Hamid Reza Bakhtari, Dominique Frizon de Lamotte, Charles Aubourg, Jamshid Hassanzadeh, Magnetic fabrics of Tertiary sandstones from the Arc of Fars (Eastern Zagros, Iran), Tectonophysics, Volume 284, Issues 3–4, 30 January 1998, Pages 299-316, ISSN 0040-1951,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40951
Deposited By: Tony Diaz
Deposited On:20 Sep 2013 19:53
Last Modified:03 Oct 2019 05:44

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