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Preliminary fault analysis and paleostress evolution in the Makran Fold-and-Thrust Belt in Iran

  • A. DolatiEmail author
  • J.-P Burg
Conference paper
Part of the Frontiers in Earth Sciences book series (FRONTIERS)

Abstract

We describe fault structures and the kinematic analysis of striated planes measured in the central part of the fold-and-thrust-belt of Makran, in Iran. Field observation documents the importance of E-W thrust faulting associated with E-W buckle folding, which is consistent with the main shortening direction expected in the study area, the convergence zone between the Arabian and Eurasian plates. Two main paleostress tensor directions are distinguished from the analysis of fault populations found in Cretaceous to Pliocene-Pleistocene rocks: the dominant NNE-SSW compression to transpression and localized extension. The compression-transpression regimes are obtained all over Makran, the Coastal area excepted, where exposures of young sedimentary rocks where faulted by normal faults. A comparison between the fault plane analysis and the active stress field obtained from focal mechanisms shows consistent compresssion directions since at least the Middle Miocene.

Keywords

Accretionary wedge Makran Paleostress 

Notes

Acknowledgements

The Swiss National Fond supported this work (project 2-77 634-05). Financial contribution and support from the MEBE program and the Geological Survey of Iran are also acknowledged. Sincere thanks are extended to the many people who hosted and helped us in the remote places of the Makran. We are indebted to B. Celerier for guidance on the inversion program and to D. Bernoulli and J. Smit for useful discussions in the field. Reviews by D. Frizon de Lamotte and O. Lacombe helped to significantly improve our presentation. We thank the editor, F. Roure, for his useful comments and for offering the opportunity to publish these results.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.ETH and University ZurichZurichSwitzerland
  2. 2.Geological Survey IranTehranIran

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