International Journal of Earth Sciences

, Volume 100, Issue 1, pp 45–62 | Cite as

Magmatic and metamorphic evolution of the Shotur Kuh metamorphic complex (Central Iran)

  • Mahmoud Rahmati-Ilkhchi
  • Shah Wali FaryadEmail author
  • František V. Holub
  • Jan Košler
  • Wolfgang Frank
Original Paper


Metamorphic basement rocks, that are exposed beneath the very low-grade to unmetamorphosed Upper Jurassic-Eocene formations north of the Torud fault zone within the Great Kavir Block, were investigated to elucidate the origin of their protoliths and the pressure and temperature conditions of metamorphism. The basement, previously assumed as a pre-Cambrian metamorphic complex, is mostly formed by amphibolite-facies orthogneisses (tonalite, granodiorite, and granite) with amphibolites and small amounts of metasediment-micaschists. Major- and trace-element geochemistry in combination with U–Pb age dating of zircon showed that the protoliths formed during Late Neoproterozoic continental arc magmatism that has also been identified in other tectonic blocks of Central Iran. In addition to quartz, feldspar(s), micas in orthogneisses, and amphibole + plagioclase in amphibolite, all rocks may contain garnet that shows prograde zoning. Kyanite was found only in some Al-rich amphibolite together with gedrite. The PT conditions of the rocks, based on conventional geothermobarometry and the pseudosection method, show a medium-pressure amphibolite-facies metamorphism. Ar–Ar age dating of muscovite reveals that this metamorphism occurred in the Middle Jurassic (166 Ma) and related to the closure of the Neotethyan basin.


Late Neoproterozoic arc magmatism Jurassic Barrovian type metamorphism Central Iran 



This work is a part of the PhD thesis of M. Rahmati-Ilkhchi at the Institute of Petrology and Structural Geology (Charles University in Prague) and was supported by the Geological Survey of Iran as well as by the Ministry of Education, Youth and Sports of the Czech Republic (Research Project MSM21620855). K. Schulmann (Strasbourg) is thanked for facility to obtain K–Ar age data of biotite and muscovite. Christoph Hauzenberger and Marlina A. Elburg are thanked for careful and thorough reviews of the manuscript. We also thank Ingo Braun for helpful comments and editorial responsibility.


  1. Assereto R (1966) The Jurassic Shemshak Formation in central Elburz (Iran). Riv Ital Paleont Stratigr 72:1133–1182Google Scholar
  2. Bagheri S, Stampfli GM (2008) The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: new geological data, relationships and tectonic implications. Tectonophysics 451:123–155CrossRefGoogle Scholar
  3. Berberian F, Berberian M (1981) Tectono-plutonic episodes in Iran. In: Gupta HK, Delany FM (eds) Zagros-Hindu Kush-Himalaya geodynamic evolution. American Geophysical Union Geodynamics Series, vol 3, pp 5–32Google Scholar
  4. Berberian M, King GCP (1981) Towards a paleogeography and tectonic evolution of Iran. Can J Earth Sci 8:210–265CrossRefGoogle Scholar
  5. Connolly JAD (2005) Computation of phase equilibria by linear programming: a tool for geodynamic modeling and its application to subduction zone decarbonation. Earth Planet Sci Lett 236:524–541CrossRefGoogle Scholar
  6. Cooper AF (1980) Retrograde alteration of chromian kyanite in metachert and amphibolite whiteschists from the southern Alps, New Zealand, with implications for uplift on the Alpine fault. Contrib Mineral Petrol 75:153–164CrossRefGoogle Scholar
  7. Crawford AR (1977) A summary of isotopic age data for Iran, Pakistan and India: Mémoire Societé Géologique de France, vol, 8, pp 251–260Google Scholar
  8. Dale J, Holland T, Powell R (2000) Hornblende-garnet-plagioclase thermobarometry; a natural assemblage calibration of the thermodynamics of hornblende. Contrib Mineral Petrol 140:353–362CrossRefGoogle Scholar
  9. De Wit M, Jeffery M, Bergh H, Nicolaysen L (1988) Geological map of sectors of Gondwana reconstructed to their disposition 150 Ma, scale 1:10,000,000. American Association of Petroleum Geologists, Tulsa, OklahomaGoogle Scholar
  10. Fotoohi Rad GR, Droop GTR, Amini S, Moazzen M (2005) Eclogites and blueschists of the Sistan Suture Zone, eastern Iran: a comparison of P–T histories from a subduction mélange. Lithos 84:1–24CrossRefGoogle Scholar
  11. Frost BR, Frost CD (2008) A geochemical classification for feldspathic igneous rocks. J Petrol 49:1955–1969CrossRefGoogle Scholar
  12. Frost BR, Arculus RJ, Barnes CG, Collins WJ, Ellis DJ, Frost CD (2001) A geochemical classification of granitic rocks. J Petrol 42:2033–2048CrossRefGoogle Scholar
  13. Ganguly J, Cheng W, Tirone M (1996) Thermodynamics of aluminosilicate garnet solid solution: new experimental data, an optimized model, and thermodynamic application. Contrib Mineral Petrol 126:137–151CrossRefGoogle Scholar
  14. Ghasemi M, Talbot CJ (2006) A new tectonic scenario for the Sanandaj-Sirjan zone (Iran). J Asian Earth Sci 26:683–693CrossRefGoogle Scholar
  15. Glennie KW (2000) Cretaceous tectonic evolution of Arabia eastern plate margin: a tale of two oceans, in Middle East models of Jurassic/Cretaceous carbonate systems. SEPM Spec Publ 69:9–20Google Scholar
  16. Graham CM, Powell R (1984) A garnet-hornblende geothermometer: calibration, testing and application to the Pelona Schist, Southern California. J Metam Geol 2:13–31CrossRefGoogle Scholar
  17. Hassanzadeh J, Stockli DF, Horton BK, Axen GJ, Stockli LD, Grove M, Schmitt AK, Walker JD (2008) U–Pb zircon geochronology of late Neoproterozoic–Early Cambrian granitoids in Iran: implications for paleogeography, magmatism, and exhumation history of Iranian basement. Tectonophysics 451:71–96CrossRefGoogle Scholar
  18. Holdaway MJ (2000) Application of new experimental and garnet Margules data to the garnet–biotite geothermometer. Am Mineral 85:881–892Google Scholar
  19. Holland TJB, Powell R (1998) An internally consistent thermodynamic data set for phases of petrological interest. J Metam Geol 16:309–343CrossRefGoogle Scholar
  20. Holland TJB, Powell R (2003) Activity-composition relations for phases in petrological calculations: an asymmetric multicomponent formulation. Contrib Mineral Petrol 145:492–501CrossRefGoogle Scholar
  21. Hushmandzadeh A, Alavi-Naini M, Haghipour A (1978) Geological evolution of Torud area (Precambrian to Recent). Geological Survey of Iran H5, pp 138 (in Farsi)Google Scholar
  22. Hynes A, Forest RC (1988) Empirical garnet-muscovite geothermometry in low-grade metapelites, Selwyn Range (Canadian Rockies). J Metam Geol 6(3):297–309CrossRefGoogle Scholar
  23. Janoušek V, Erban V, Farrow C (2006) Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). J Petrol 47:1255–1259CrossRefGoogle Scholar
  24. Kohn MJ, Spear FS (1990) Two new geobarometers for garnet amphibolites, with applications to southeastern Vermont. Am Mineral 75:89–96Google Scholar
  25. Košler J, Fonneland H, Sylvester P, Tubrett M, Pedersen RB (2002) U-Pb dating of detrital zircons for sediment provenance studies - a comparison of laser ablation ICPMS and SIMS techniques. Chem Geol 182:605–618CrossRefGoogle Scholar
  26. Lawver LA, Scotese CR (1987) A revised reconstruction of Gondwanaland. In McKenzie GD (ed) Gondwana six; structure, tectonics, and geophysics. American Geophysical Union Washington DC, Geophysical Monograph 40, pp 17–23Google Scholar
  27. Meschede M (1986) A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb–Zr–Y diagram. Chem Geol 56:207–218CrossRefGoogle Scholar
  28. Nadimi A (2007) Evolution of the Central Iranian basement. Gondwana Res 12:324–333CrossRefGoogle Scholar
  29. Newton RC, Charlu TV, Kleppa OJ (1980) Thermochemistry of the high structural state plagioclases. Geochim Cosmochim Acta 44:933–941CrossRefGoogle Scholar
  30. Paul A, Kaviani A, Hatzfeld D, Mokhtari M (2003) Lithospheric structure of central Zagros from seismological tomography. In: Four international conferences of earthquake engineering and seismology, 12–14 May, Tehran, IranGoogle Scholar
  31. Pearce JA (1983) Role of sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth CJ, Norry MJ (eds) Continental basalts and mantle xenoliths. Shiva, Nantwich, pp 230–249Google Scholar
  32. Pearce JA, Harris NBW, Tindle AG (1984) Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J Petrol 25:956–983Google Scholar
  33. Perchuk LL, Lavrentjeva IV (1983) Experimental investigation of exchange equilibria in the system cordierite–garnet–biotite. In: Saxena SK (ed) Kinetics and equilibrium mineral reactions. Adv Phys Geochem vol 3, pp 199–239Google Scholar
  34. Powell CMA, Johnson BD, Veevers JJ (1980) A revised fit of East and West Gondwanaland. Tectonophysics 63:13–29CrossRefGoogle Scholar
  35. Rahmati-Ilkhchi M (2002) Geological map of Razveh (scale 1:100,000). Geological Survey of Iran, Tehran, IranGoogle Scholar
  36. Rahmati-Ilkhchi M, Jeřábek P, Faryad SW, Košler J (2008) Tectono-metamorphic evolution of the Shotur Kuh metamorphic core complex in the Central Iranian block. In: 6th Meeting of the Central European Tectonic Group, Upohlav Slovakia SlovTec 08, pp 48–49Google Scholar
  37. Ramezani J, Tucker RD (2003) The Saghand Region, Central Iran: U–Pb geochronology, petrogenesis and implications for Gondwana tectonics. Am J Sci 303:622–665CrossRefGoogle Scholar
  38. Robinson P, Ross M, Jaffe HW (1971) Composition of the anthophyllite-gedrite series, comparisons of gedrite and hornblende, and the anthophyllite-gedrite solvus. Am Mineral 56:1005–1041Google Scholar
  39. Schreyer W (1973) Whiteschist: a high-pressure rock and its geologic significance. J Geol 81:735–739CrossRefGoogle Scholar
  40. Schreyer W, Seifert F (1969) High-pressure phases in the system MgO–Al2O3–SiO2–H2O. Am J Sci 267-A:407–413Google Scholar
  41. Selverstone J, Spear FS, Franz G, Morteani G (1984) High pressure metamorphism in the SW Tauern window, Austria: P-T paths from hornblende-kyanite-staurolite schists. J Petrol 25:501–531Google Scholar
  42. Sengör AMC (1991) Late Paleozoic and Mesozoic tectonic evolution of the Middle Eastern Tethysides: implication for the Paleozoic Geodynamics of the Tethyan realm. IGCP Project 276 Newsletter No 2, pp 111–149Google Scholar
  43. Sheikholeslami MR, Pique A, Mobayen P, Sabzehei M, Bellon H, Hashem Emami M (2008) Tectono-metamorphic evolution of the Neyriz metamorphic complex, Quri-Kor-e-Sefid area (Sanandaj-Sirjan Zone, SW Iran). J Asian Earth Sci 31:504–521CrossRefGoogle Scholar
  44. Spear FS (1980) The gedrite–anthophyllite solvus and the composition limits of orthoamphiboles from the Post Pond volcanics, Vermont. Am Mineral 65:1103–1118Google Scholar
  45. Spear FS (1982) Phase equilibria of amphibolites from the Post Pond Volcanics, Mt Cube Quadrangle, Vermont. J Petrol 23:383–426Google Scholar
  46. Stampfli GM (1978) Etude géologique générale de l’Elburz oriental au S de Gonbad-e-Qabus, Iran N-E. Fac Sci Univ Genève, Thesis No 1868, pp 329Google Scholar
  47. Stöcklin J (1968) Structural history and tectonics of Iran: a review. Am Assoc Pet Geol Bull 52(7):1229–1258Google Scholar
  48. Stöcklin J (1977) Structural correlation of the Alpine ranges between Iran and Central Asia. Mém Soc Géol France, hors Sér 8:333–353Google Scholar
  49. Takin M (1972) Iranian geology and continental drift in the Middle East. Nature 235:147–150CrossRefGoogle Scholar
  50. Unrug R (1997) Rodinia to Gondwana: the geodynamic map of Gondwana supercontinent assembly. GSA Today 7(1):1–6Google Scholar
  51. Ustaömer PA, Ustaömer T, Collins AS, Robertson AHF (2009) Cadomian (Ediacaran–Cambrian) arc magmatism in the Bitlis Massif, SE Turkey: magmatism along the developing northern margin of Gondwana. Tectonophysics 473:99–112CrossRefGoogle Scholar
  52. Ward CM (1984) Magnesium staurolite and green chromian staurolite from Fiordland, New Zealand. Am Mineral 69:531–540Google Scholar
  53. Wood DA (1980) The application of a Th–Hf–Ta diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary Volcanic Province. Earth Planet Sci Lett 50:11–30CrossRefGoogle Scholar
  54. Wu CM, Cheng BH (2006) Valid garnet-biotite (GB) geothermometry and garnet–aluminum silicate–plagioclase–quartz (GASP) geobarometry in metapelitic rocks. Lithos 89:1–23CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Mahmoud Rahmati-Ilkhchi
    • 1
    • 2
  • Shah Wali Faryad
    • 1
    Email author
  • František V. Holub
    • 1
  • Jan Košler
    • 3
  • Wolfgang Frank
    • 4
  1. 1.Institute of Petrology and Structural GeologyCharles University in PraguePragueCzech Republic
  2. 2.Geological Survey of IranTehranIran
  3. 3.Department of Earth Science and Centre for GeobiologyUniversity of BergenBergenNorway
  4. 4.Central European Argon LaboratorySlovak Academy of SciencesValasška, BratislavaSlovakia

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