Abstract
The Chah-Bazargan gabbroic intrusions are located in the south of Sanandaj–Sirjan zone. Precise U–Pb zircon SHRIMP ages of the intrusions show magmatic ages of 170.5 ± 1.9 Ma. These intrusions consist primarily of gabbros, interspersed with lenticular bodies of anorthosite, troctolite, clinopyroxenite, and wehrlite. The lenticular bodies show gradational or sharp boundaries with the gabbros. In the gradational boundaries, gabbros are mineralogically transformed into anorthosites, wehrlites, and/or clinopyroxenites. On the other hand, where the boundaries are sharp, the mineral assemblages change abruptly. There is no obvious deformation in the intrusions. Hence, the changes in mineral compositions are interpreted as the result of crystallization processes, such as fractionation in the magma chamber. Rock types with sharp boundaries show abrupt chemical changes, but the changes exhibit the same patterns of increasing and decreasing elements, especially of rare earth elements, as the gradational boundaries. Therefore, it is possible that all parts of the intrusions were formed from the same parental magma. Parts showing signs of nonequilibrium crystallization, such as cumulate features and sub-solidification, underwent fracturing and were interspersed throughout the magma chamber by late injection pulses or mechanical movements under mush conditions. The geological and age data show that the intrusions were formed from an Al-, Sr-, Fe-enriched and K-, Nb-depleted tholeiitic magma. The magma resulted from the partial melting of a metasomatized spinel demonstrated by negative Nb, P, Hf, and Ti, and positive Ba, Sr, and U anomalies typical of subduction-related magmas.
Similar content being viewed by others
References
Agard P, Omrani J, Jolivet L, Mouthereau F (2005) Convergence history across Zagros (Iran): constraints from collisional and earlier deformation. Geol Rundsch 94:401–419
Agard P, Omrani J, Jolivet L, Whitechurch H, Vrielynck B, Spakman W, Monié P, Meyer B, Wortel R (2011) Zagros orogeny: a subduction-dominated process. Cambridge University Press, Cambridge, pp 1–34. doi:10.1017/S001675681100046X
Alavi M (1994) Tectonic of the Zagros orogenic belt of Iran: new data and interpretations. Tectonophysics 229:211–238
Aldanmaz E, Pearce JA, Thirlwall MF, Mitchell JG (2000) Petrogenetic evolution of late Cenozoic, post-collision volcanism in western Anatolia, Turkey. J Volcanol Geotherm Res 102:67–95
Arvin M, Pan Y, Dargahi S, Malekizadeh A, Babaei A (2007) Petrochemistry of the Siah-Kuh granitoid stock southwest of Kerman, Iran: implications for initiation of Neotethys subduction. J Asian Earth Sci 30:474–489
Azizi H, Jahangiri A (2008) Cretaceous subduction-related volcanism in the northern Sanandaj–Sirjan Zone, Iran. J Geodyn 45:178–190
Azizi H, Tanaka T, Asahara Y, Lin Chung S, Zarrinkoub MH (2011) Discrimination of the age and tectonic setting for magmatic rocks along the Zagros thrust zone, northwest Iran, using the zircon U–Pb age and Sr–Nd isotopes. J Geodyn 52:304–320
Baharifar A, Moinevaziri H, Bellon H, Piqué A (2004) The crystalline complexes of Hamadan (Sanandaj–Sirjan zone, western Iran): metasedimentary meso-zoic sequences affected by Late Cretaceous tectono-metamorphic and plutonic events. Comptes Rendus Geosci 336:1443–1452
Berberian F, Berberian M (1981) Tectono-plutonic episodes in Iran. Am Geophys Union Geodyn Series 3:5–32
Berberian M, King GCP (1981) Towards a paleogeography and tectonic evolution of Iran. Can J Earth Sci 18:210–265
Bertrand P, Mercier J-CC (1985) The mutual solubility of coexisting ortho—and clinopyroxene: toward an absolute geothermometer for the natural system? Earth Planet Sci Lett 76:109–122
Best MG (2003) Igneous and metamorphic petrology. Blackwell, London 730 pp
Black LP, Kamo SL, Allen CM, Aleinikoff JN, Davis DW, Korsch RJ, Foudoulis C (2003) TEMORA 1: a new zircon standard for phanerozoic U–Pb geochronology. Chem Geol 200:155–170
Brey GP, Köhler T (1990) Geothermobarometry in four-phase lherzolites II. New thermobarometers, and practical assessment of existing thermobarometers. J Petrol 31:1353–1378
Campbell K, Ghazi AM, LaTour T, Hassanipak AA (1999) Geochemistry, petrology and tectonincs of the Shahr-Babak ophiolite, SE Iran. Geol Soc Am SE Sect Abstr Progr 31:9
Dorani M (2006) Investigating of petrology, geochemistry and petrogenesis of gabbroic intrusions in the Western of Shahr-Babak. Unpublished M.sc. thesis. Shahid Bahonar University of Kerman, Iran, 165 pp
Dorani M, Moradian A (2007) Geochemical and tectonomagmatic investigation of gabbros in southwest of Shahr-Babak, Kerman Province. Iran Soc Cryst Mineral 86:193–210
Elliott T, Plank T, Zindler A, White W, Bourdon B (1997) Element transport from slab to volcanic front at the Mariana arc. J Geophys Res 102:14991–15019
Fazlnia AN (2009) The partial melting of metapelitic xenoliths in the Chah-Bazargan batholith, Shahr-Babak and formation of per-aluminous granite patches. Sci Shahid Chamran Univ 23:61–87
Fazlnia AN, Moradian A, Rezaei K, Moazzen M, Alipour S (2007) Synchronous activity of anorthositic and S-type granitic magmas in the Chah-Dozdan batholith, Neyriz, Iran: evidence of zircon SHRIMP and monazite CHIME dating. J Sci I R Iran 18:221–237
Fazlnia AN, Schenk V, van der Straaten F, Mirmohammadi MS (2009) Petrology, geochemistry, and geochronology of trondhjemites from the Quri complex, Neyriz, Iran. Lithos 112:413–433
Frey FA (1980) The origin of pyroxenites and garnet pyroxenites from Salt Lake Crater, Oahu, Hawaii: trace element evidence. Am J Sci 280:427–449
Fujimaki H, Tatsumoto M, Aoki K (1984) Partition coefficients of Hf, Zr and REE between phenocrysts and groundmasses. Proceedings of the fourteenth lunar and planetary science conference, part 2. J Geophy Res Suppl 89:662–672
Ghazi AM, Hassanipak AA (2000) Petrology and geochemistry of the Shahr-Babak ophiolite, Central Iran. Geol Surv Am 349:485–497
Ghazi AM, Pessagno EA, Hassanipak AA, Kariminia SM, Duncan RA, Babaie HA (2003) Biostratigraphic zonation and 40Ar–39Ar ages for the Neotethyan Khoy ophiolite of NW Iran. Palaeogeogr Palaeoclimatol Palaeoecol 193:311–323
Ghazi AM, Hassanipak AA, Mahoney JJ, Duncand RA (2004) Geochemical characteristics, 40Ar–39Ar ages and original tectonic setting of the Band-e-Zeyarat/Dar Anar ophiolite, Makran accretionary prism, SE Iran. Tectonophysics 393:175–196
Gill R (2010) Igneous rocks and processes: a practical guide. Wiley-Blackwell, Malaysia
Golonka J (2004) Plate tectonic evolution of the southern margin of Eurasia in the Mesozoic and Cenozoic. Tectonophysics 381:235–273
Green NL (2006) Influence of slab thermal structure on basalt source regions and melting conditions: REE and HFSE constraints form the Garibaldi volcanic belt, northern Cascadia subduction system. Lithos 87:23–49
Grove TL, Parman SW, Bowring SA, Price RC, Baker MB (2002) The role of an H2O-rich fluid component in the generation of primitive basaltic andesites and andesites form the Mt. Shasta region, N. California. Contrib Mineral Petrol 142:375–396
Hammarstrom JM, Zen E (1986) Aluminum in hornblende: an empirical igneous geobarometer. Am Mineral 71:1297–1313
Hart SR, Dune T (1993) Experimental cpx/melt partitioning of 24 trace elements. Contrib Mineral Petrol 113:1–8
Herzberg CT, Chapman NA (1976) Clinopyroxene gsothermometry of spinel-lherzolite. Am Mineral 6:626–637
Hollister LS, Grisson GC, Peters EK, Stowell HH, Sisson VB (1987) Confirmation of the empirical correlation of Al in hornblende with pressure of solidification of calc-alkaline plutons. Am Mineral 72:231–239
Hunter RH (1996) Texture development in cumulate rocks. In: Cawthorn RG (ed) Layered intrusion, pp 77–102
Irving AJ, Frey FA (1978) Distribution of trace elements between garnet megacrysts and host volcanic liquidus of kimberkitic to rhyolitic composition. Geochim Cosmochim Acta 42:771–787
Johnson KTM (1994) Experimental cpx/and garnet/melt partitioning of REE and other trace elements at high pressures; petrogenetic implications. Mineral Mag 58:454–455
Johnson KTM (1998) Experimental determination of partition coefficients for rare earth and high-field-strength elements between clinopyroxene, garnet, and basaltic melt at high pressure. Contrib Mineral Petrol 133:60–68
Johnson MC, Rutherford MJ (1988) Experimental calibration of an aluminum-in-hornblende geobarometer applicable to calc-alkaline rocks. Geology 17:837–841
Keskin M (2005) Domal uplift and volcanism in a collision zone without a mantle plume: evidence from Eastern Anatolia. www.MantlePlumes.org
Khadivi S, Mouthereau F, Barbarand J, Adatte T, Lacombe O (2012) Constraints on paleodrainage evolution induced by uplift and exhumation on the southern flank of the Zagros–Iranian Plateau. J Geol Soc Lond 169:83–97
Kretz R (1983) Symbols for rock-forming minerals. Am Mineral 68:277–279
Ludwig KR (2001) SQUID 1.02: a user’s manual, vol 2. Berkeley Geochronology Centre, California, Special Publication
Ludwig KR (2003) User’s manual for Isoplot 3.00: a geochronological toolkit for Microsoft Excel, vol 4. Berkeley Geochronology Centre, California, Special Publication
Marsh BD (1988) Crystal capture, sorting, and retention in convecting magma. Geol Soc Am Bull 100:1720–1737
McKenzie DP, O’Nions RK (1991) Partial melt distribution from inversion of rare earth element concentrations. J Petrol 32:1021–1091
Middlemost EAK (1985) Magmas and magmatic rocks: an introduction to igneous petrology. Longman Group, UK
Moghadem HS, Stern RJ (2011) Geodynamic evolution of late Cretaceous Zagros ophiolites: formation of oceanic lithosphere above a nascent subduction zone. Geol Mag 148:762–801
Molinaro M, Zeyen H, Laurencin X (2005) Lithospheric structure underneath the SE Zagros Mountains, Iran: recent slab break-off? Terra Nova 25:1–6
Mouthereau F (2011) Timing of uplift in the Zagros belt/Iranian plateau and accommodation of late Cenozoic Arabia/Eurasia convergence. In: Lacombe O, Grasemann B, Simpson G (eds) Geodynamic evolution of the Zagros, pp 726–738
Mouthereau F, Lacombe O, Vergés J (2012) Building the Zagros collisional orogen: timing, strain distribution and the dynamics of Arabia/Eurasia plate convergence. Tectonophysics 532–535:27–60
Omrani J, Agard P, Whitechurch H, Benoit M, Prouteau G, Jolivet L (2008) Arc-magmatism and subduction history beneath the Zagros Mountains, Iran: a new report of adakites and geodynamic consequences. Lithos 106:380–398
Pearce JW, Peate DW (1995) Tectonic implications of the composition of volcanic arc magmas. Annu Rev Earth Planet Sci 23:251–285
Pearce JA, Bender JF, De Long SE, Kidd WSF, Low PJ, Guner Y, Saroglu F, Yilmaz Y, Moorbath S, Mitchell JG (1990) Genesis of collision volcanism in Eastern Anatolia, Turkey. J Volcan Geotherm Res 44:189–229
Pearce JA, Baker PE, Harvey PK, Luff IW (1995) Geochemical evidence for subduction fluxes, mantle melting and fractional crystallization beneath the South Sandwich-Island Arc. J Petrol 36:1073–1109
Plank T, White WM (1995) Nb and Ta in arc and mid-ocean basalts. AGU Fall Meet Abstr EOS 76:655
Rahmati-Ilkhchi M, Jeřábek P, Faryad SW, Koyi HA (2010) Mid-Cimmerian, Early Alpine and Late Cenozoic orogenic events in the Shotur Kuh metamorphic complex, Great Kavir block, NE Iran. Tectonophysics 494:101–117
Rickwood PC (1989) Boundary lines within petrologic diagrams which use oxides of major and minor elements. Lithos 22:247–263
Rollinson HR (1993) Using geochemical data: evaluation, presentation, interpretation. Wiley, New York 344 pp
Sabzehei M, Navazi M, Ghavidel M, Hamdi SB (1992) Geological map of Neyriz (1/250,000). Geol Surv Iran
Sarkarinejad K, Godin L, Faghih A (2009) Kinematic vorticity flow analysis and 40Ar/39Ar geochronology related to inclined extrusion of the HP–LT metamorphic rocks along the Zagros accretionary prism, Iran. J Struct Geol 1:691–706
Schmidt MW (1992) Amphibole composition in tonalite as a function pressure: an experimental calibration of the Al-in-hornblende barometer. Contrib Mineral Petrol 110:304–310
Schmidt MW, Dardon A, Chazot G, Vannucci R (2004) The dependence of Nb and Ta rutile-melt partitioning on melt composition and Nb/Ta fractionation during subduction processes. Earth Planet Sci Lett 226:415–432
Shahabpour J (2005) Tectonic evolution of the orogenic belt in the region located between Kerman and Neyriz. J Asian Earth Sci 24:405–417
Shahbazi H, Siebe W, Pourmoafee M, Ghorbani M, Sepahi AA, Shang CK, 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. J Asian Earth Sci 39:668–683
Shaw DM (1970) Trace element fractionation during anatexis. Geochim Cosmochim Acta 34:237–243
Sheikholeslami R, Bellon H, Emami H, Sabzehei M, Pique I (2003) Nouvellés donneés structurales et datatious 40K–40Ar sur roches metamorphiques de lá region de Neyriz (Zone de Sanandaj-Sirjan, Iran meridional), Leur tethysien du Moyen-Orient. J C R Geosci 335:981–991
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 31:504–521
Steiger RH, Jäger E (1977) Subcommission on geochronology: convention on the use of decay constants in geo- and cosmo-chronology. Earth Planet Sci Lett 36:359–362
Stöcklin J (1968) Structural history and tectonics of Iran; a review. Am Assoc Petrol Geol Bull 52:1229–1258
Stöcklin J (1977) Structural correlation of the Alpine ranges between Iran and Central Asia. Mémoire Hors-Serie Soc Géolo France 8:333–353
Stoneley R (1981) The geology of the Kuh-e Dalneshin area of southern Iran, and its bearing on the evolution of southern Tethys. J Geol Soc Lond 138:509–526
Sun SS, McDonough WF (1989) Chemical and isotopic systematic of oceanic basalts: implications for mantle composition and processes. In: Saunders AS, Norry MJ (eds) Magmatism in Ocean. Geological Society of London, Special Publication, pp 313–345
Wager LR, Brown GM (1968) Layered igneous rocks. W. H. Freeman, San Francisco 588 pp
Wiedenbeck M, Allé P, Corfu F, Griffin WL, Meier M, Oberli F, von Quadt A, Roddick JC, Spiegel W (1995) Three natural zircon standards for U–Th–Pb, Lu–Hf, trace element and REE analyses. Geostand Newslett 19:1–23
Wilson M (1989) Igneous petrogenesis: a global tectonic approach. Unwin Hymen, London 466 pp
Wilson AH (1996) The Great Dyke of Zimbabwe. In: Cawthorn RG (ed) Layered intrusion, pp 365–402
Woodhead JD, Eggins S, Gamble J (1993) High field strength and transition element systematics in island arc and back-arc basin basalts: evidence for a multiphase melts extraction and a depleted mantle wedge. Earth Planet Sci Lett 144:491–504
Xionga XL, Adamb TJ, Green TH (2005) Rutile stability and rutile/melt HFSE partitioning during partial melting of hydrous basalt: implications for TTG genesis. Chem Geol 218:339–359
Zhao J-H, Zhou M-F (2007) Geochemistry of Neoproterozoic mafic intrusions in the Panzhihua district (Sichuan Province, SW China): implications for subduction-related metasomatism in the upper mantle. Precam Res 152:27–47
Acknowledgments
The authors would like to thank Mrs. Barbara Mader for her support during EMP analyses in Kiel University. Financial support from the Iranian Ministry of Science, Research and Technology, and from the Universities of Kerman and Urmia (Iran) and Institute für Geowissenschaften, Christian-Albechts-Universität zu Kiel (Germany) are gratefully acknowledged. The authors like to thank Editors of International Journal of Earth Sciences and reviewers of the paper for their efforts. Last, but not least, we would like to thank anonymous academic from USA for editing the article.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fazlnia, A., Schenk, V., Appel, P. et al. Petrology, geochemistry, and geochronology of the Chah-Bazargan gabbroic intrusions in the south Sanandaj–Sirjan zone, Neyriz, Iran. Int J Earth Sci (Geol Rundsch) 102, 1403–1426 (2013). https://doi.org/10.1007/s00531-013-0884-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00531-013-0884-6