A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

DOI: 10.4236/ns.2012.42014   PDF   HTML   XML   4,483 Downloads   8,974 Views   Citations


The Boroujerd pluton (ca 175 Ma) was emplaced in the Sanandaj-Sirjan zone (SSZ) active margin of Central Iran consists of monzogranite, granodiorite, and quartz-diorite. Microstructural studies show a continuum from magmatic to (sub) mylonitic deformations fabric. Intensity of deformation decreases from W-NW to E-SE. The over- all magnetic fabric of the pluton yields steep NW- SE striking foliations and sub-horizontal lineations plunging both to the northwest and south- east. These features imply that during intrusion of the pluton, a NW-SE trending stretching was dominant. This stretching is ascribed to the trans- pressive deformation of the overriding SSZ during northeastward subduction of the Neotethys under the Iranian plate. The NW-SE trending lineations of the Gousheh pluton (ca 35 Ma) suggest that the transpressive regime was ongoing from the Mesozoic to late Eocene.

Share and Cite:

Rasouli, J. , Ahadnejad, V. and Esmaeily, D. (2012) A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran. Natural Science, 4, 91-105. doi: 10.4236/ns.2012.42014.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Ahmadi-Khalaji, A., Esmaeily, D., Valizadeh, M.V. and Rahiumpour-Bonab, H. (2007) Petrology and geochemistry of the granitoid complex of Boroujerd, Sanandaj-Sir- jan Zone, Western Iran. Journal of Asian Earth Sciences, 29, 859-877. doi:10.1016/j.jseaes.2006.06.005
[2] Ghalamghash, J., Nédéléc, A., Bellon, H., Vosoughi Abedini, M. and Bouchez, J.L. (2009) The Urumieh plutonic complex (NW Iran): A record of the geodynamic evolution of the Sanandaj-Sirjan zone during Cretaceous times—Part I: Petrogenesis and K/Ar dating. Journal of Asian Earth Sciences, 35, 401-415. doi:10.1016/j.jseaes.2009.02.002
[3] Asnaashary, A., Hassanzadeh, J., Wernicke, B., Schmitt, A.K., Axen, G. and Horton, B. (2009) Middle Jurassic flare-up and Cretaceous magmatic lull in the central Sanandaj-Sirjan arc, Iran. An analogy with the southwestern United States. Proceedings of the Geological Survey of Amrica Annual Meeting, 4.
[4] Shahbazi, H., Siebel, W., Pourmoafee, M., Ghorbani, M., Sepahi, A.A., Shang, C.K. and Vousoughi Abedini, M. (2010) Geochemistry and U-Pb zircon geochronology of the Alvand plutonic complex in Sanandaj-Sirjan Zone (Iran): New evidence for Jurassic magmatism. Journal of Asian Earth Sciences, 39, 668-683. doi:10.1016/j.jseaes.2010.04.014
[5] Petford, N., Lister, J.R. and Kerr, R.C. (1994) The ascent of felsic magmas in dykes. Lithos, 32, 161-168. doi:10.1016/0024-4937(94)90028-0
[6] Borradaile, G.J. and Henry, B. (1997) Tectonic applications of magnetic susceptibility and its anisotropy. Earth Science Reviews, 42, 9-93. doi:10.1016/S0012-8252(96)00044-X
[7] Bouchez, J.L. (1997) Granite is never isotropic: An introduction to AMS studies in granitic rocks. In: Bouchez, J.L., Hutton, D.H.W. and Stephens, W.E. Eds., Granite: from Segregation of Melt to Emplacement Fabrics, Kluwer Academic, Dordrecht, 95-112.
[8] Bouchez, J.L. (2000) Anisotropie de susceptibilité magnétique et fabrique des granites. Comptes Rendus de l'Academie de Science de Paris, 330, 1-14.
[9] Borradaile, G.J. (1988) Magnetic susceptibility, petrofabrics and strain. Tectonophysics, 156, 1-20. doi:10.1016/0040-1951(88)90279-X
[10] Rochette, P., Jackson, M. and Aubourg, C. (1992) Rock magnetism and the interpretation of anisotropy of magnetic susceptibility. Reviews of Geophysics, 30, 209-222. doi:10.1029/92RG00733
[11] Berberian, F. and Berberian, M. (1981) Tectono-plutonic episodes in Iran. In: Gupta, H.K. and Delany, F.M., Eds., Zagros Hindukosh, Himalaya Geodynamic Evolution, American Geophysical Union, Washington DC, 5-32. doi:10.1029/GD003p0005
[12] Ghalamghash, J., Bouchez, J.L., Vosoughi Abedini, M. and Nédéléc, A. (2009) The Urumieh plutonic complex (NW Iran): A record of the geodynamic evolution of the Sanandaj-Sirjan zone during Cretaceous times—Part II: Magnetic fabrics and plate tectonic reconstruction. Journal of Asian Earth Sciences, 36, 303-317.
[13] St?cklin, J. (1968) Structural history and tectonics of Iran; a review. American Association of Petroleum Geologists Bulletin, 52, 1229-1258.
[14] Darvishzadeh, A. (1991) Geology of Iran. Neda Publication, Tehran, Iran, 1991.
[15] Alavi, M. (1994) Tectonic of the Zagros orogenic belt of Iran new data and interpretations. Tectonophysics, 229, 211-238. doi:10.1016/0040-1951(94)90030-2
[16] Davoudzadeh, M. (1997) Iran. In: Moores, E.M. and Fairbridge, R.W., Eds., Encyclopedia of European and Asian Regional Geology, Encyclopedia of Earth Sciences Series, Chapman and Hall, London.
[17] Dehghani, G. and Makris, J. (1983) The gravity field and crustal structure of Iran. Geological Survey of Iran, 51, 51-68.
[18] Masoudi, F. (1997) Contact metamorphism and pegmatite development in the region SW of Arak, Iran. PhD thesis, The University of Leeds, UK.
[19] Masoudi, F., Yardley, B.W.D. and Cliff, R.A. (2002) Rb-Sr geochronology of the pegmatites, plutonic rocks and hornfels in the region south-west of Arak, Iran. Journal of Science (Iran), 13, 249-254.
[20] Razavi, S.M.H., Masoudi, F. and Sarikhani, H. (2008) Petrology of Gosheh-Nelkhast Intrusions in the region NE of Borujerd, Iran. Journal of Science, Islamic Azad University, 18, 10-20.
[21] Nezafati, N. (2006) Au-Sn-W-Cu-Mineralization in the Astaneh-Sarband Area, West Central Iran, including a comparison of the ores with ancient bronze artifacts from Western Asia. PhD Thesis, Eberhard-Karls-Universit?t Tübingen, Germany.
[22] Bouchez, J.L., Guillet, P. and Chevalier, F. (1981) Structures d'écoulement liés à la mise en place du granite de Guérande (Loire Atlantique, France). Bulletin De La Societe Geologique De France, 7/Xxiii, 387-399.
[23] Paterson, S.R., Vernon, R.H. and Tobish, O.T. (1989) A review of criteria for the identification of magmatic and tectonic foliations in granitoids. Journal of Structural Geology, 11, 349-363. doi:10.1016/0191-8141(89)90074-6
[24] Leblanc, D., Gleizes, G., Roux, L. and Bouchez, J.L. (1996) Variscan dextral transpression in the French Pyrenees: New data from the Pic des Trois-Seigneurs granodiorite and its country rocks. Tectonophysics, 261, 331- 345. doi:10.1016/0040-1951(95)00174-3
[25] Bouchez, J.L., Delas, C., Gleizes, G. and Nédéléc, A. (1992) Submagmatic microfractures in granites. Geology, 20, 35-38. doi:10.1130/0091-7613(1992)020<0035:SMIG>2.3.CO;2
[26] Arzi, A.A. (1978) Critical phenomena in the rheology of partially melted rocks. Tectonophysics, 44, 173-184. doi:10.1016/0040-1951(78)90069-0
[27] Fernandez, A. and Gasquet, D.R. (1994) Relative rheological evolution of chemically contrasted coeval magmas: Example of the Tichka plutonic complex. Contribution to Mineralogy and Petrology, 116, 316-326. doi:10.1007/BF00306500
[28] Rochette, P. (1987) Magnetic susceptibility of the rock matrix related to magnetic fabric studies. Journal of Structural Geology, 9, 1015-1020. doi:10.1016/0191-8141(87)90009-5
[29] Jover, O., Rochette, P., Lorand, J.P., Maeder, M. and Bouchez, J.L. (1989) Magnetic mineralogy of some granites from the French Massif Central; origin of their low- field susceptibility. Physics of the Earth And Planetary Interiors, 55, 79-92. doi:10.1016/0031-9201(89)90235-5
[30] Launeau, P. (1990) Analyse numerique des images et orientations preferentielles de forme des agregats polyphasés; Application á l’analyse cinematique des granites. PhD Thesis, Univ. Paul Sabatier, Toulouse, France, 180 Pages.
[31] Gleizes, G., Leblanc, D., Olivier, Ph. and Bouchez, J.L. (2001) Strain partitioning in a pluton during emplacement in transpressional regime: The example of the Néouvielle granite (Pyrenees). International Journal of Earth Sciences (Geologische Rundschau), 90, 325-340.
[32] Gleizes, G., Crevon, G., Asrat, A. and Barbey, P. (2006) Structure, age and mode of emplacement of the Hercynian Borde` res-Louron pluton (Central Pyrenees, France). International Journal of Earth Sciences (Geologische Rundschau), 95, 1039-1052. doi:10.1007/s00531-006-0088-4
[33] Bouchez, J.L., Gleizes, G., Djouadi, T. and Rochette, P. (1990) Microstructure and magnetic susceptibility applied to emplacement kinematics of granites: The example of the Foix pluton (French Pyrenees). Tectonophysics, 184, 157-171. doi:10.1016/0040-1951(90)90051-9
[34] Hrouda, F., Taborska, S., Schulmann, K., Jezeck, J. and Dolejs, D. (1999) Magnetic fabric and rheology of co-mingled magmas in Nasavrky Plutonic Complex (E Bohemia): implications for intrusive strain regime and emplacement mechanisms. Tectonophysics, 307, 93-111. doi:10.1016/S0040-1951(99)00121-3
[35] McNulty, B.A., Tobisch, O.T., Cruden, A.R. and Gilder, S. (2000) Multistage emplacement of the Mount Givens pluton Central Sierra Nevada batholith. GSA Bulletin, 112, 119-135. doi:10.1130/0016-7606(2000)112<119:MEOTMG>2.0.CO;2
[36] Ahadnejad, V. (2010) Petrology, geochemistry and emplacement mechanism of Malayer plutonic complex, west Iran, using Anisotropy of magnetic Susceptibility (AMS). PhD thesis, University of Tehran, 294 Pages.
[37] Hrouda, F. (1982) Magnetic anisotropy of rocks and its application in geology and geophysics. Geophysical Surveys, 5, 37-82. doi:10.1007/BF01450244
[38] Benn, K. (1994) Overprinting of magnetic fabrics in granites by small strains: Numerical modelling. Tectono-physics, 233, 153-162. doi:10.1016/0040-1951(94)90238-0
[39] Olivier, Ph., de Saint-Blanquat, M., Gleizes, G. and Leblanc, D. (1997) Homogeneity of granite fabrics at the metre and dekametre scales. In: Bouchez, J.L., Hutton, D.H.W. and Stephens, W.E., Eds., Granite: from Segregation of Melt to Emplacement Fabrics, Kluwer Academic, Dordrecht, 113-127.
[40] Aranguren, A., Larrea, F.J., Carracedo, M., Cuveas, J. and Tubia, J.M. (1997) The Los Pedroches batholith (southern Spain). Polyphase interplay between shear zones in transtension and setting of granites. In: Bouchez, J.L., Hutton, D.H.W. and Stephens, W.E., Eds., Granites: From Segregation of Melt to Emplacement Fabrics, Kluwer Academic, Dordrecht, 215-229.
[41] de Saint-Blanquat, M. and Tikoff, B. (1997) Development of magmatic to solid-state fabrics during syntectonic emplacement of the Mono Creek granite, Sierra Nevada batholith. In: Bouchez, J.L., Hutton, D.H.W. and Stephens, W.E., Eds., Granites: From Segregation of Melt to Emplacement Fabrics, Kluwer Academic Publishers, Dordrecht, 231-252.
[42] Guillet, P., Bouchez, J.L. and Wagner, J.J. (1983) Anisotropy of magnetic susceptibility and magmatic structures in the Guérande granite massif (France). Tectonics, 2, 419-429. doi:10.1029/TC002i005p00419
[43] Benn, K., Paterson, S.R., Lund, S., Pignotta, G.S. and Kruse, S. (2001) Magmatic fabrics in batholiths as markers of regional strains and plate kinematics: Example of the Cretaceous Mt. Stuart batholith. Physics and Chemistry of the Earth (A), 26, 343-354. doi:10.1016/S1464-1895(01)00064-3
[44] Bouillin, J.P., Bouchez, J.L., Lespinasse, P. and Pêcher, A. (1993) Granite emplacement in an extensional setting: an AMS study of the magmatic structures of Monte Capanne (Elba, Italy). Earth and Planetary Science Letters, 118, 263-279. doi:10.1016/0012-821X(93)90172-6
[45] Ahadnejad, V., Valizadeh, M.V. and Esmaeily, D. (2008) The role of shear zone on the emplacement of Malayer Granitoid Complex, NW Iran. Journal of Applied Sciences, 8, 4238-4250. doi:10.3923/jas.2008.4238.4250
[46] Mazhari, S.A., Bea, F., Amini, S., Ghalamghash, J., Molina, J.F., Montero, P., Scarrow, J.H. and Williams, I.S. (2009) The Eocene bimodal Piranshahr massif of the Sanandaj_Sirjan Zone, NW Iran: A marker of the end of the collision in the Zagros orogen. Journal of the Geological Society, 166, 53-69. doi:10.1144/0016-76492008-022
[47] Gleizes, G., Nédélec, A., Bouchez, J.L., Autran, A. and Rochette, P. (1993) Magnetic susceptibility of the Mont-Louis Andorra ilmenite-type granite (Pyrenees): A newtool for the petrographic characterization and regional mapping of zoned granite pluton. Journal of Geophysical Research, 98, 4317-4331. doi:10.1029/92JB01590
[48] Tikoff, B. and Teyssier, C. (1994) Strain modeling of displacement-field partitioning in transpressional orogens. Journal of Structural Geology, 16, 1575-1588. doi:10.1016/0191-8141(94)90034-5

comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.