Document Type: Final File


1 Department of Geology, Faculty of Sciences, University of Payam Noor,Tehran, Islamic Republic of Iran

2 Department of Research and Development (R and D), Pars Kani Co. Tehran, Islamic Republic of Iran


Robat-e Zengejeh rocks affected by a variety of events began from Precambrian. This research studied preserved effects of the events. Regional metamorphism is the oldest event in this rocks include schist, amphibolite and orthogneiss, that reached up to amphibolite facies. After this regional metamorphism, it seems that mesocratic (624±5Ma) and hololeucocratic granitoides intruded respectively. Mesocratic and hololeucocratic granitoides deformed to granite-gneiss and gneiss along the northern main fault. Moreover, amphibolites show strong lineation along the faults, which as well as petrographic evidences point to the effects of dynamometamorphism in the area. Meatmorphism followed by low-grade regional metamorphism (low-greenschist facies) affected by granitoids of Robat-e Zengejeh. low-grade regional metamorphism, acted as a retrograde metamorphism for the paragenesis of the previous regional metamorphism. Finally, a sodic metasomatism affected Robat-e Zengejeh  rocks which its mineralogical and geochemical evidences are significant. 


Main Subjects

1.            Jamshidi Badr M., Masoudi F., Collins A.S. and Cox C. Dating of Precambrian Metasedimentary Rocks and Timing of their Metamorphism in the Soursat Metamorphic Complex (NW IRAN): Using LA–ICPMS, U–Pb Dating of Zircon and Monazite. J. Sci. I. R. Iran.  21(4): 311-319 (2010).

2.            Jamshidi Badr M., Collins A.S.,  Masoudi F., Cox C. and Sorbi A. Mineralogical evidence for regional metamorphism overprinted by contact metamorphism. Acta Geol. Sin. Engl. 86(1): 48-84 (2012).

3.            Karagaranbafghi. F., Foeken J.P.T., Guest B. and Stuart F.M. Cooling history of the Chapedony metamorphic core complex, Central Iran: Implications for the Eurasia–Arabia collision, Tectonophysics. 524–525:100–107 (2012).

4.            Bagheri S. and Stampfli M. G.The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: New geological data, relationships and tectonic implications, Tectonophysics. 451 :123–155 (2008).

5.            Mitchell A., Chung S. L., Oo T., Lin T. H. and Hung C. H. Zircon U–Pb ages in Myanmar: Magmatic–metamorphic events and the closure of a neo-Tethys ocean? J. Asian. Earth Sci. 56: 1–23 (2012).

6.            Wang K., Burov E., Gumiaux C., Chen Y., Lu G., Mezri L. and Zhao L. Formation of metamorphic core complexes in non-over-thickened continental crust: A case study of Liaodong Peninsula (East Asia). Litho. 238: 86–100 (2015).

7.            Liu P., Liu F., Liu C., Liu J., Wang F., Xiao L., Cai J. and Shi J. Multiple mafic magmatic and high-grade metamorphic eventsrevealed by zircons from meta-mafic rocks in theDaqingshan–Wulashan Complex of the Khondalite Belt,North China Craton, Precambrian Research. 246: 334–357 (2014).

8.            Ruttner A., Nabavi M.H. and Hajian J. Geological map of Ferdous area. Geol. Surv. Iran (1997).

9.            Faramarzi N. S. Petrology and geochemistry of Robat- Zengejeh granitoides (southwestern Bardaskan). Master thesis, Kharazmi University. 253 p (2006) (In Persian with English abstract).

10.          Monazzami Bagherzadeh R, Karimpour MH, Lang Farmer G, Stern CR, Santos JF, Rahimi B, Heidarian Shahri MR. U–Pb zircon geochronology, petrochemical and Sr–Nd isotopic characteristic of Late Neoproterozoic granitoids of the Bornaward complex (Bardaskan-NE Iran).32nd national and the 1st International Geosciences Congress, Ministry of industry, Mine and Trade, Geol. Surv. Iran. (2014).

11.          Shand S. J. The Eruptive Rocks, 2nd edn. New York. John Wiley. 444 p (1943).

12.          Pearce J.A. Trace element characteristics of lavas from destructive plate boundaries, in: Thorpe, R.S. (Ed.), Andesites: Orogenic Andesites and Related Rocks. Chichester, England, John. Wiley and Sons. 525-548 (1982).

13.          Chappell B. W., White A. J. R. Two contrasting granite types: 25 years later. Aust J. Earth Sci. 48.4: 489-499 (2011).

14.          Pearce J.A., Harris N.B.W. and Tindle A.G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J. Petrol. 25: 956-983 (1984).

15.          Maniar P.D. and Piccoli P.M. Tectonic deterimination of Granitoids. Geo, Soc. of Am; Bull. 101: 635-643 (1989).

16.          Harris N.B.W., Xu R., Lewis C.L., Hawkeworth C.J. and Zhang Y. Isotope geochemistry of the Tibet Geotraverse, Lhasa to Golmud. Phil. Trans. R. Soc. L. 327: 263-285 (1988).

17.          Carley T.L., Miller C.F., Wooden J.L., Padilla A.J., Schmitt A.K., Economos R.C., Bindeman I.N., Jordan B.T. Iceland is not a magmatic analog for the Hadean: Evidence from the zircon record. Earth Planet. Sci. Lett. 405: 85-97 (2014(.

18.          Hassanzadeh J., Stockli D. F., Horton, B.K., Gary J. and Schmitt, A.K. U-Pb zircon geochronology of late Neoproterozoic– Early Cambrian granitoids in Iran: Implications for paleogeography, magmatism, and exhumation history of Iranian basement. Tectonophysics .451:71–96 (2008).

19.          Balaghi Einalou M., Sadeghian M., Zhai M., Ghasemi H., Mohajjel M. Zircon U-Pb ages, Hf isotopes and geochemistry of the schists, gneisses and granites in Delbar Metamorphic-Igneous Complex, SE of Shahrood (Iran): Implications for Neoproterozoic geodynamic evolutions of Central Iran. J. Asian. Earth Sci. 92: 92-124 (2014).

20.          Shafaii Moghadam H., Khademi M., Hu Z., Stern R.J., Santos J.F. and Wu Y. Cadomian (Ediacaran-Cambrian) arc magmatism in the ChahJam-Biarjmand metamorphic complex (Iran): Magmatism along the northern active margin of Gondwana. Gondwana. Res.27: 439-452 (2013).

21.          Faramarzi N. S., Amini S., Schmitt A. K., Hassanzadeh J., Borg G., McKeegan K., Razavi S. M. H. and Mortazavi S. M. Geochronology and geochemistry of rhyolites from Hormuz Island, southern Iran: A new record of Cadomian arc magmatism in the Hormuz Formation. Litho. 237: 203-211 (2015).

22.          Karimpour M. H., Farmer G. L., Stern C. R. and Salati E. U-Pb zircon geochronology and Sr-Nd isotopic characteristic of Late Neoproterozoic Bornaward granitoids (Taknar zone exotic block), Iran. Iran. J. crystal. and mineral. 19: 11-20 (2011).

23.          Brander L., Henrik S., Sandra P. Brittle-plastic deformation in initially dry rocks at fluid-present conditions: transient behaviour of feldspar at mid-crustal levels. Contrib. Mineral. Petrol.  163.3: 403-425 (2012).

24.          Trepmann C. A., Stöckhert B. Short-wavelength undulatory extinction in quartz recording coseismic deformation in the middle crust-an experimental study. Solid Earth. 4: 263-264 (2013).

25.          Davoudzadeh M. and Schmidt K. Contribution to the paleogeography, stratigraphy and tectonics of the Middle and Upper Jurassic of Iran. Neu. Jb. Mineral. Abh. 166 (3): 327-346 (1983).

26.          Collins L. G., Collins B. J. Origin of myrmekite as it relates to K-, Na-, and Ca-metasomatism and the metasomatic origin of some granite masses where myrmekite occurs. Contrib. Mineral. Petrol. 213: 123-156  (2013). 

27.          Dostal J., Konta, D. J., Karl S. M. The Early Jurassic Bokan Mountain peralkaline granitic complex (southeastern Alaska): Geochemistry, petrogenesis and rare-metal mineralization. Lithos. 202: 395-412 (2014).

28.          Rong J., Wang F. Metasomatic Textures in Granites.Springer. Mineral. 22: 143-144  (2016).

29.          Touret J.L.R. and Nijland T.G. Chapter 11. Prograde, Peak and Retrograde Metamorphic Fluids and Associated Metasomatism in Upper Amphibolite to Granulite Facies Transition Zones; in Harlov D.E., and Austrheim H., (eds.), Metasomatism and the Chemical Transformation of Rock, The Role of Fluids in Terrestrial and Extraterrestrial Processes. Springer, New York. 415-469 (2012).

30.          Putnis A. and Austrheim H. Mechanisms of metamorphism and metasomatism on the local scale: The role of dissolution-reprecipitation during mineral re-equilibration. In: Metasomatism and the Chemical transformation of rock. Harlov D.E. and Austrheim H. (eds.). Springer-Verlag. 139-167 (2012)

31.          Morad S., El-Ghahi M.A.K., Caja M.A., Sirat M., Al-Ramadan K. and Mansurbeg H. Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden. Geological Journal. 45: 105-116 (2010).

32.          Putnis C.V. and Ruiz-Agudo E. The Mineral-Water Interface: Where Minerals React with the Environment. Elements. 9: 177-182 (2013).

33.          Johnson B.R. and Glazner A.F. Formation of K-feldspar megacrysts in granodioritic plutons by thermal cycling and late-stage textural coarsening. Contrib. Mineral. Petrol. 159: 599-619 (2010).

34.          Wilson B. M. Igneous petrogenesis a global tectonic approach. S Sci. Business Media.  47: 777-780 (2007).