Abstract
Shahre-Babak ophiolite is a part of the inner Zagros ophiolite belt in Iran. Major parts of intrusive masses of Share-Babak ophiolite are gabbro and plagiogranite. The SiO2 versus Na2O+K2O diagram shows that the palgiogranites are related to calk-alkaline series. Rare earth elements exhibit relatively similar pattern that indicates these rocks are syngenetic. Also, REE patterns display an enrichment of LREE compared to HREE, and are characterized by flat to slightly concaveup patterns from Gd to Yb. Such patterns contrast sharply with those of plagiogranites in more complete ophiolite sequences, such as the Semail ophiolite, Oman, or the Troodos ophiolite, Cyprus, and Neyriz, where patterns are much flatter and slightly LREE-depleted. The slightly LREE-enriched patterns of the Shahre-Babak plagiogranites support a partial melting origin for them. The low TiO2, Nb, Ta content and high LREE concentrations of the Shahre-Babak plagiogranites indicate that the rocks were likely derived from the anatexis of amphibolites, which were related to hydrothermal alteration of gabbros in intra-oceanic back-arc basin.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References Cited
Ahmadipour, H., Rostamizadeh, G. 2012. Geochemical Aspects of Na-Metasomatism in Sargaz Granitic Intrusion (South of Kerman Province, Iran). Journal of Sciences, Islamic Republic of Iran, 23: 45–58
Alavi, M., Vaziri, H., Seyed-Emami, K., et al., 1997. The Triassic and Associated Rocks of the Nakhlak and Aghdarband Areas in Central and Northeastern Iran as Remnants of the Southern Turanian Active Continental Margin. Geological Society of America Bulletin, 109(12): 1563–1575. doi:10.1130/0016-7606(1997)109〈1563:ttaaro〉2.3.co;2
Aldiss, D. T., 1981. Plagiogranites from the Ocean Crust and Ophiolites. Nature, 289(5798): 577–578.
Alizadeh, E., Arvin, M., Dargahi, S., 2012. Geochemistry and Petrogenesis of Plagiogranites in the Neyriz Ophiolitic Sequence, Iran: Constraints on Their Origin. Journal of Petrology, 12: 1–14 (in Persian)
Allègre, C. J., Minster, J. F., 1978. Quantitative Models of Trace Element Behavior in Magmatic Processes. Earth and Planetary Science Letters, 38(1): 1–25. doi:10.1016/0012-821x(78)90123-1
Arth, J. G., 1976. Behavior of Trace Elements during Magmatic Processes––A Summary of Theoretical Models and Their Applications. J. Res. US Geol. Surv., 4: 41–47
Babaie, H. A., Babaei, A., Ghazi, A. M., et al., 2006. Geochemical, 40Ar/39Ar Age, and Isotopic Data for Crustal Rocks of the Neyriz Ophiolite, Iran. Canadian Journal of Earth Sciences, 43(1): 57–70. doi:10.1139/e05-111
Bedard, J. H., 1999. Petrogenesis of Boninites from the Betts Cove Ophiolite, Newfoundland, Canada: Identification of Subducted Source Components. Journal of Petrology, 40(12): 1853–1889. doi:10.1093/petroj/40.12.1853
Berberian, M., King, G. C. P., 1981. Towards a Paleogeography and Tectonic Evolution of Iran. Canadian Journal of Earth Sciences, 18(2): 210–265
Berndt, J., Koepke, J., Holtz, F., 2005. An Experimental Investigation of the Influence of Water and Oxygen Fugacity on Differentiation of MORB at 200 MPa. Journal of Petrology, 46(1): 135–167. doi:10.1093/petrology/egh066
Bézos, A., Humler, E., 2005. The Fe3+/ƩFe Ratios of MORB Glasses and Their Implications for Mantle Melting. Geochimica et Cosmochimica Acta, 69(3): 711–725. doi:10.1016/j.gca.2004.07.026
Boomeri, M., Mizuta, T., Ishiyama, D., et al., 2006. Fluorine and Chlorine in Biotite from the Sarnwosar Granitic Rocks, Northeastern Iran. Iranian Journal of Science & Technology, Transaction A, 30(A1): 111–125
Boynton, W. V., 1984. Cosmochemistry of the Rare Earth Elements: Meteorite Studies. In: Henderson, P., ed., Rare Earth Element Geochemistry. Elsevier, Amsterdam. 63–114
Christie, D. M., Carmichael, I. S. E., Langmuir, C. H., 1986. Oxidation States of Mid-Ocean Ridge Basalt Glasses. Earth and Planetary Science Letters, 79(3/4): 397–411. doi:10.1016/0012-821x(86)90195-0
Coleman, R. G., Donato, M., 1979. Oceanic Plagiogranite Revisited. Trondhjemites, Dacites, and Related Rocks. Elsevier, Amsterdam. 149–167
Coleman, R. G., Peterman, Z. E., 1975. Oceanic Plagiogranite. Journal of Geophysical Research, 80(8): 1099–1108. doi:10.1029/jb080i008p01099
Dilek, Y., Furnes, H., 2011. Ophiolite Genesis and Global Tectonics: Geochemical and Tectonic Fingerprinting of Ancient Oceanic Lithosphere. Geological Society of America Bulletin, 123(3/4): 387–411. doi:10.1130/b30446.1
Dixon, S., Rutherford, M. J., 1979. Plagiogranites as Late-Stage Immiscible Liquids in Ophiolite and Mid-Ocean Ridge Suites: An Experimental Study. Earth and Planetary Science Letters, 45(1): 45–60. doi:10.1016/0012-821x(79)90106-7
Flagler, P. A., Spray, J. G., 1991. Generation of Plagiogranite by Amphibolite Anatexis in Oceanic Shear Zones. Geology, 19(1): 70–73. doi:10.1130/0091-7613(1991)019〈0070:gopbaa〉2.3.co;2
Floyd, P. A., Yaliniz, M. K., Goncuoglu, M. C., 1998. Geochemistry and Petrogenesis of Intrusive and Extrusive Ophiolitic Plagiogranites, Central Anatolian Crystalline Complex, Turkey. Lithos, 42(3/4): 225–241. doi:10.1016/s0024-4937(97)00044-3
Frost, B. R., Barnes, C. G., Collins, W. J., et al., 2001. A Geochemical Classification for Granitic Rocks. Journal of Petrology, 42(11): 2033–2048. doi:10.1093/petrology/42.11.2033
Gerlach, D. C., Leeman, W. P., Lallemant, H. G. A., 1981. Petrology and Geochemistry of Plagiogranite in the Canyon Mountain Ophiolite, Oregon. Contributions to Mineralogy and Petrology, 77(1): 82–92. doi:10.1007/bf01161505
Ghazi, A. M., Hassanipak, A. A., 2000. Petrology and Geochemistry of the Shahr-Babak Ophiolite, Central Iran. Geological Society of America Bulletin, Special Paper, 349: 485–497
Golestani, M., 2013. Petrology, Geochemistry and Tectonic Setting Intrusive Massives of Baft Ophiolitic––Melange, Southeast of Kerman, Iran. Journal of Tethys, 3: 164–176
Grimes, C. B., John, B. E., Cheadle, M. J., et al., 2008. Protracted Construction of Gabbroic Crust at a Slow Spreading Ridge: Constraints from 206Pb/238U Zircon Ages from Atlantis Massif and IODP Hole U1309D (30ºN, MAR). Geochemistry, Geophysics, Geosystems, 9(8): 1–24. doi:10.1029/2008gc002063
Grimes, C. B., Ushikubo, T., Kozdon, R., et al., 2013. Perspectives on the Origin of Plagiogranite in Ophiolites from Oxygen Isotopes in Zircon. Lithos, 179: 48–66. doi:10.1016/j.lithos.2013.07.026
Hanson, G. N., 1978. The Application of Trace Elements to the Petrogenesis of Igneous Rocks of Granitic Composition. Earth and Planetary Science Letters, 38(1): 26–43. doi:10.1016/0012-821x(78)90124-3
Hawkesworth, C. J., Gallagher, K., Hergt, J. M., et al., 1993. Mantle and Slab Contributions in ARC Magmas. Annual Review of Earth and Planetary Sciences, 21(1): 175–204. doi:10.1146/annurev.ea.21.050193.001135
Humphris, S. E., 1984. The Mobility of the Rare Earth Elements in the Crust. In: Henderson, P., ed., Rare Earth Element Geochemistry. Elsevier, Amsterdam. 317–342
Jiang, Y. H., Liao, S. Y., Yang, W. Z., et al., 2008. An Island Arc Origin of Plagiogranites at Oytag, Western Kunlun Orogen, Northwest China: SHRIMP Zircon U-Pb Chronology, Elemental and Sr-Nd-Hf Isotopic Geochemistry and Paleozoic Tectonic Implications. Lithos, 106(3/4): 323–335. doi:10.1016/j.lithos.2008.08.004
Koepke, J., Berndt, J., Feig, S. T., et al., 2007. The Formation of SiO2-Rich Melts within the Deep Oceanic Crust by Hydrous Partial Melting of Gabbros. Contrib. Miner. Petrol., 153: 67–84
Koepke, J., Feig, S. T., Snow, J., et al., 2004. Petrogenesis of Oceanic Plagiogranites by Partial Melting of Gabbros: An Experimental Study. Contributions to Mineralogy and Petrology, 146(4): 414–432. doi:10.1007/s00410-003-0511-9
Li, X. H., Faure, M., Lin, W., et al., 2013. New Isotopic Constraints on Age and Magma Genesis of an Embryonic Oceanic Crust: The Chenaillet Ophiolite in the Western Alps. Lithos, 160/161: 283–291. doi:10.1016/j.lithos.2012.12.016
Lippard, S. J., Shelton, A. W., Gass, I. G., 1986. The Ophiolite of Northern Oman. Geological Society of London Memoir. Blackwell Scientific Publications, Oxford. 11: 178
Ludden, J. N., Thompson, G., 1979. An Evaluation of the Behavior of the Rare Earth Elements during the Weathering of Sea-Floor Basalt. Earth and Planetary Science Letters, 43(1): 85–92. doi:10.1016/0012-821x(79)90157-2
Malpas, J., 1979. Two Contrasting Trondhjemite Associations from Transported Ophiolites in Western Newfoundland: Initial Report. Developments in Petrology, 9: 465–487. doi:10.1016/b978-0-444-41765-7.50020-4
Martin, H., Smithies, R. H., Rapp, R., et al., 2005. An Overview of Adakite, Tonalite-Trondhjemite-Granodiorite (TTG), and Sanukitoid: Relationships and Some Implications for Crustal Evolution. Lithos, 79(1/2): 1–24. doi:10.1016/j.lithos.2004.04.048
Meffre, S., Aitchison, J. C., Crawford, A. J., 1996. Geochemical Evolution and Tectonic Significance of Boninites and Tholeiites from the Koh Ophiolite, New Caledonia. Tectonics, 15(1): 67–83. doi:10.1029/95tc02316
Mirnejad, H., Lalonde, A. E., Obbeid, M., et al., 2013. Geochemistry and Petrogenesis of Mashhad Granitoid: An Insight into the Geodynamic History of Paleo-Tethys in Northeast of Iran. Lithos, 170: 105–116.
Nakamura, N., 1974. Determination of REE, Ba, Fe, Mg, Na and K in Carbonaceous and Ordinary Chondrites. Geochimica et Cosmochimica Acta, 38(5): 757–775. doi:10.1016/0016-7037(74)90149-5
O’Connor, J. T., 1965. A Classification for Quartz-Rich Igneous Rock Based upon Feldspar Ratios. U.S.G.S. Professional Paper, 525B: B79–B84
Pearce, J. A., 1983. Role of the Sub-Continental Lithospher in Magma Genesis at Active Continental Margin. In: Hawkesworth, C. J., Norry, M. J., eds., Continental Basalts and and Mantle Xenolitehs. Shiva, Nantwich. 230–249
Pearce, J. A., Norry, M. J., 1979. Petrogenetic Implications of Ti, Zr, Y, and Nb Variations in Volcanic Rocks. Contributions to Mineralogy and Petrology, 69(1): 33–47. doi:10.1007/bf00375192
Pedersen, R. B., Malpas, J., 1984. The Origin of Oceanic Plagiogranites from the Karmoy Ophiolite, Western Norway. Contributions to Mineralogy and Petrology, 88(1/2): 36–52. doi:10.1007/bf00371410
Rajabzadeh, M. A., Dehkordi, T. N., Caran, S., 2013. Mineralogy, Geochemistry and Geotectonic Significance of Mantle Peridotites with High-Cr Chromitites in the Neyriz Ophiolite from the Outer Zagros Ophiolite Belts, Iran. Journal of African Earth Sciences, 78: 1–15. doi:10.1016/j.jafrearsci.2012.09.013
Shafaii Moghadam, H., Stern, R. J., Chiaradia, M., et al., 2013. Geochemistry and Tectonic Evolution of the Late Cretaceous Gogher-Baft Ophiolite, Central Iran. Lithos, 168–169: 33–47. doi:10.1016/j.lithos.2013.01.013
Shafaii Moghadam, H., Whitechurch, H., Rahgoshay, M., et al., 2009. Significance of Nain-Baft Ophiolitic Belt (Iran): Short-Lived, Transtensional Cretaceous Back-Arc Oceanic Basins over the Tethyan Subduction Zone. Comptes Rendus Geoscience, 341(12): 1016–1028. doi:10.1016/j.crte.2009.06.011
Snyder, D., Carmichael, I. S. E., Wiebe, R. A., 1993. Experimental Study of Liquid Evolution in an Fe-Rich, Layered Mafic Intrusion: Constraints of Fe-Ti Oxide Precipitation on the T-f O2 and T-Q Paths of Tholeiitic Magmas. Contributions to Mineralogy and Petrology, 113(1): 73–86. doi:10.1007/bf00320832
Tilton, G. R., Hopson, C. A., Wright, J. E., 1981. Uranium-Lead Isotopic Ages of the Samail Ophiolite, Oman, with Applications to Tethyan Ocean Ridge Tectonics. Journal of Geophysical Research: Solid Earth, 86(B4): 2763–2775. doi:10.1029/jb086ib04p02763
Toplis, M. J., Carroll, M. R., 1995. An Experimental Study of the Influence of Oxygen Fugacity on Fe-Ti Oxide Stability, Phase Relations, and Mineral––Melt Equilibria in Ferro-Basaltic Systems. Journal of Petrology, 36(5): 1137–1170. doi:10.1093/petrology/36.5.1137
Walker, R., Jackson, J., 2002. Offset and Evolution of the Gowk Fault, S.E. Iran: A Major Intra-Continental Strike-Slip System. Journal of Structural Geology, 24(11): 1677–1698. doi:10.1016/s0191-8141(01)00170-5
Walker, R., Jackson, J., 2002. Offset and Evolution of the Gowk Fault, S.E. Iran: A Major Intra-Continental Strike-Slip System. Journal of Structural Geology, 24(11): 1677–1698. doi:10.1016/s0191-8141(01)00170-5
Xu, J. F., Castillo, P. R., Chen, F. R., et al., 2003. Geochemistry of Late Paleozoic Mafic Igneous Rocks from the Kuerti Area, Xinjiang, Northwest China: Implications for Backarc Mantle Evolution. Chemical Geology, 193(1/2): 137–154. doi:10.1016/s0009-2541(02)00265-6
Zeng, L. J., Niu, H. C., Bao, Z. W., et al., 2015. Petrogenesis and Tectonic Significance of the Plagiogranites in the Zhaheba Ophiolite, Eastern Junggar Orogen, Xinjiang, China. Journal of Asian Earth Sciences, 113: 137–150. doi:10.1016/j.jseaes.2014.09.031
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sepidbar, F., Mirnejad, H. Mineralogy, geochemistry and geotectonic of plagiogranites from Shahre-Babak ophiolite, Zagros zone, Iran. J. Earth Sci. 27, 507–518 (2016). https://doi.org/10.1007/s12583-016-0668-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12583-016-0668-6