Petrology and geochemistry of Eocene volcanic rocks from southeast of Khur (Isfahan province, Central Iran)

زمین شناسی اقتصادی

Article 14, Volume 14, Issue 1 - Serial Number 32, 2022, Pages 157-184   

Document Type: Research Article

DOI: 10.22067/econg.2021.68731.1007

Authors

Paniz Shadman¹; Ghodrat Torabi^{* 2}

¹Ph.D. Student, Department of Geology, University of Isfahan, Isfahan, Iran

²Professor, Department of Geology, University of Isfahan, Isfahan, Iran

Abstract

Introduction
Subduction-related magmas are characterized by enrichment of large ion lithophile elements (LILEs), light rare earth elements (LREEs) and depletion in high field strength elements (HFSEs) (Harangi et al., 2007). These geochemical signatures of magmatic rocks are commonly explained by the addition of hydrous fluids from subducting oceanic lithosphere combined with the flux of melts from subducted sediments to the mantle wedge, lowering the mantle solidus and leading to magma generation (Aydınçakır, 2016).
Asthenospheric mantle, subcontinental lithospheric mantle and/or lower crust may be the principal source of these rocks (Eyuboglu et al., 2018). In addition, magma differentiation processes, such as fractional crystallization, crustal contamination, and magma mixing may also play an important role in the genesis of these rocks.
This research study presents new petrological and geochemical data from the volcanic rocks with NW–SE trending, which are situated in the northwestern margin of the Central –East Iranian Microcontinent (CEIM) (south-east of Khur, Isfahan Province) which have been formed during the peak activity of Eocene. Study of this typical small volume subduction- related magmatism will be useful in understanding the origin and geological evolution of the Central Iran in Cenozoic.
 
Analytical Methods
The petrographic investigations on Eocene volcanic rocks from the SE of Khur area were carried out with an optical microscope (Olympus-BH2) in the petrology Laboratory of the University of Isfahan, Iran. 
Major and trace element concentrations of samples from whole- rocks were obtained by a combination of inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) at the Als Chemex Laboratory of Ireland. The chemical compositions of 4 samples (B865, B866, B867, and B868) were determined by Neutron Activation Analysis (NAA) in the Isfahan Activation Center.
The detection limit was 0.01% for all major element oxides and 0.01 ppm for rare earth elements.
Mineral abbreviations were adopted from Whitney and Evans (2010).
 
Results and Discussion
Eocene volcanic rocks with trachy-basalt and trachy-basaltic andesite composition are exposed in the northwestern part of the Central-East Iranian Microcontinent (CEIM) (SE of Khur, Isfahan Province, Central Iran). These rocks which have a dominant northwest-southeast trend crosscut the Cretaceous sedimentary rocks.
Petrography and mineral chemistry analyses indicate that the predominant rock-forming minerals of volcanic rocks are olivine, plagioclase, clinopyroxene and orthopyroxene. Phenocrysts set in a fine to medium grained matrix of the same minerals plus sanidine with minor amounts of opaque minerals. Secondary minerals are chlorite and calcite. The most common textures of these rocks are porphyritic, microlitic porphyritic, poikiolitic and glomeroporphyritic.
Geochemical analyses of whole rock samples show that these rocks have been enriched in alkalies and large ion lithophile elements (Cs, K, Rb, Sr, Ba,), and have been depleted in high field strength elements (HFSE) (Ta, Nb, Ti). All samples indicate moderate to high fractionation in LREE patterns. These geochemical signatures point out to the subduction-related calc-alkaline nature of these rocks and their similarity to volcanic rocks of continental arcs or convergent margins (Yu et al., 2017).
Pb enrichment and low values of Nb/La, Nb/U and Ce/Pb ratios reveal that crustal contamination has played an important role in magma evolution (Srivastava and Singh, 2004; Furman, 2007).
The large volume of hydrous fluids coming from the subducted slab rather than sediments have caused enrichment and metasomatism of the subcontinental lithospheric mantle source.
The geochemical characteristics of the studied rocks suggest that the parental magma have been derived from partial melting of a metasomatized spinel lherzolite of lithospheric mantle, which was previously modified by dehydration of a subducting slab. The tectonic environment, in which these rocks were formed has probably been a volcanic arc.
Subduction of oceanic crust around the Central-East Iranian Microcontinent (CEIM) is the most reasonable mechanism which can be used to explain enrichment in volatiles of the mantle, and the calc-alkaline magmatism of the study area in Eocene times.
 
Acknowledgments
The authors thank the University of Isfahan for financial supports.
 
 

Keywords

Petrology; volcanic rocks; Eocene; Khur; Isfahan; Central Iran Microcontinent

References

Aistov, L., Melanikov, B., Krivyokin, B., Morozov, L. and Kiristaev, V., 1984. Geology of Khur Area (Central Iran). Geological Survey of Iran, Tehran, Report 20, 131 pp.

Ahmadian, J., Haschke, M., McDonald, I., Regelous, M., RezaGhorbani, M., Emami, M.H. and Murata, M., 2009. High magmatic flux during Alpine-Himalayan collision: Constraints from the Kal-e-Kafi complex, central Iran. Geological Society of America Bulletin, 121(5–6): 857–868. https://doi.org/10.1130/B26279.1

 Alavi, M., 1991. Sedimentary and structural characteristics of the Paleo-Tethys remnants in northeastern Iran. Geological Society of America Bulletin, 103(8): 983–992. https://doi.org/10.1130/0016-7606(1991)103<0983:SASCOT>2.3.CO;2

Alavi, M., 1994. Tectonics of the Zagros orogenic belt of Iran: new data and interpretations. Tectonophysics, 229(3–4): 211–238. https://doi.org/10.1016/0040-1951(94)90030-2

Aldanmaz, E.R.C.A.N., Pearce, J.A., Thirlwall, M.F. and Mitchell, J.G. 2000. Petrogenetic evolution of late Cenozoic, post-collision volcanism in western Anatolia, Turkey. Journal of Volcanology and Geothermal Research, 102(1–2): 67–95. https://doi.org/10.1016/S0377-0273(00)00182-7

Almasian, M., 1997. Tectonics of the Anarak area (central Iran). PhD.Thesis, Islamic Azad University, Science and Research Unit, Tehran, Iran, 164 pp.

Asiabanha, A., Bardintzeff, J.M., Kananian, A.and Rahimi, G., 2012. Post-Eocene volcanics of the Abazar district, Qazvin, Iran: Mineralogical and geochemical evidence for a complex magmatic evolution. Journal of Asian Earth Sciences, 45(2): 79–94. https://doi.org/10.1016/j.jseaes.2011.09.020

Aydınçakır, E., 2016. Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: Constraints on geodynamic implications. Geodinamica Acta, 28(4): 379–411. https://doi.org/10.1080/09853111.2016.1208526

Bagheri, S. and Stampfli, G.M., 2008. The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: new geological data, relationships and tectonic implications. Tectonophysics, 451(1–4): 123–155. https://doi.org/10.1016/j.tecto.2007.11.047

 

Bahadoran, N., Torabi, G., Ahmadian, J. and Murata, M., 2008. Mineral chemistry of volcanic rocks from the West of Arousan-e-Kaboudan (NE of Isfahan). Iranian Journal of Crystallography and Mineralogy, 16(1): 99–112. Retrieved October 15, 2007 from https://www.sid.ir/FileServer/JF/51713870109.pdf

Barker, D.S., 1983. Igneous Rocks. Pretence Hall. New Jersey, 417 pp.

Berberian, M. and King, G.C.P., 1981. Towards a paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences, 18(2): 210–265. https://doi.org/10.1139/e81-019

Berberian, F., Muir, I.D., Pankhurst, R.J. and Berberian, M., 1982. Late Cretaceous and early Miocene Andean-type plutonic activity in northern Makran and Central Iran. Journal of the Geological Society of London, 139(5): 605–614. https://doi.org/10.1144/gsjgs.139.5.0605

Castillo, P.R., 2006. An overview of adakite petrogenesis. Chinese Science Bulletin, 51(3): 257–268. https://doi.org/10.1007/s11434-006-0257-7

Chashchin, A.A., Sorokin, A.A., Lebedev, V.A. and Blokhin, M.G., 2016. Age, main geochemical characteristics, and sources of late Cenozoic volcanic rocks in the Udurchukan volcanic area (Amur Region). Russian Journal of Pacific Geology, 10(4): 239–248. https://doi.org/10.1134/S1819714016040035

Chen, C.H., 1988. Estimation of the degree of partial melting by Na₂O+K₂O and Al₂O₃/SiO₂ of basic magmas. Chemical Geology, 71(4): 355–364. https://doi.org/10.1016/0009-2541(88)90059-9

Dercourt, J., Zonenshain, L.P., Ricou, L.E., Kazmin, V.G., Le Pichon, X., Knipper, A.L. and Pechersky, D.H., 1986. Geological evolution of the Tethys belt from the Atlantic to the Pamirs since the Lias. Tectonophysics, 123(1–4): 241–315. https://doi.org/10.1016/0040-1951(86)90199-X

Dilek, Y., Imamverdiyev, N. and Altunkaynak, Ş., 2010. Geochemistry and tectonics of Cenozoic volcanism in the Lesser Caucasus (Azerbaijan) and the peri-Arabian region: collision-induced mantle dynamics and its magmatic fingerprint. International Geology Review, 52(4–6): 536–578. https://doi.org/10.1080/00206810903360422

Eyuboglu, Y., Dudas, F.O., Santosh, M., Eroğlu-Gümrük, T., Akbulut, K., Yi, K. and Chatterjee, N., 2018. The final pulse of the Early Cenozoic adakitic activity in the Eastern Pontides Orogenic Belt (NE Turkey): An integrated study on the nature of transition from adakitic to non-adakitic magmatism in a slab window setting. Journal of Asian Earth Sciences, 157(3): 141–165. https://doi.org/10.1016/j.jseaes.2017.07.004

Fan, W.M., Guo, F., Wang, Y.J. and Lin, G., 2003. Late Mesozoic calc-alkaline volcanism of post-orogenic extension in the northern Da Hinggan Mountains, northeastern China. Journal of Volcanology and Geothermal Research, 121(1–2): 115–135. https://doi.org/10.1016/S0377-0273(02)00415-8

Fu, D., Huang, B., Peng, S., Kusky, T.M., Zhou, W.and Ge, M., 2016. Geochronology and geochemistry of late Carboniferous volcanic rocks from northern Inner Mongolia, North China: Petrogenesis and tectonic implications. Gondwana Research, 36(2): 545–560. https://doi.org/10.1016/j.gr.2015.08.007

Furman, T., 2007. Geochemistry of East African Rift basalts: An overview. Journal of African Earth Sciences, 48(2–3): 147–160. https://doi.org/10.1016/j.jafrearsci.2006.06.009

Ghalamghash, J., Schmitt, A.K. and Chaharlang, R., 2019. Age and compositional evolution of Sahand volcano in the context of post-collisional magmatism in northwestern Iran: Evidence for time-transgressive magmatism away from the collisional suture. Lithos, 344(3): 265–279. https://doi.org/10.1016/j.lithos.2019.06.031

Ghasemi, A. and Talbot, C.J., 2006. A new tectonic scenario for the Sanandaj–Sirjan Zone (Iran). Journal of Asian Earth Sciences, 26(6): 683–693. https://doi.org/10.1016/j.jseaes.2005.01.003

Gill, J.B., 1981. Orogenic andesites and plate tectonics. Springer, Berlin, 390 pp.

Gorton, M.P. and Schandl, E. S., 2000. From continents to island arcs: a geochemical index of tectonic setting for arc-related and within-plate felsic to intermediate volcanic rocks. The Canadian Mineralogist, 38(5): 1065–1073. https://doi.org/10.2113/gscanmin.38.5.1065

Goss, A.R. and Kay, S.M., 2009. Extreme high field strength element (HFSE) depletion and near-chondritic Nb/Ta ratios in Central Andean adakite-like lavas (28°S, 68° W). Earth and Planetary Science Letters, 279(1–https://doi.org/10.1016/j.epsl.2008.12.0352): 97–109. https://doi.org/10.1016/j.epsl.2008.12.035

Green, N.L., 2006. Influence of slab thermal structure on basalt source regions and melting conditions: REE and HFSE constraints from the Garibaldi volcanic belt, northern Cascadia subduction system. Lithos, 87(1–2): 23–49. https://doi.org/10.1016/j.lithos.2005.05.003

Guo, F., Li, H., Fan, W., Li, J., Zhao, L., Huang, M. and Xu, W., 2015. Early Jurassic subduction of the Paleo-Pacific Ocean in NE China: Petrologic and geochemical evidence from the Tumen mafic intrusive complex. Lithos, 224(2): 46–60. https://doi.org/10.1016/j.lithos.2015.02.014

Harangi, S., Downes, H., Thirlwall, M. and Gméling, K., 2007. Geochemistry, petrogenesis and geodynamic relationships of Miocene calc-alkaline volcanic rocks in the Western Carpathian arc, eastern central Europe. Journal of Petrology, 48(12): 2261–2287. https://doi.org/10.1093/petrology/egm059

Hastie, A. R., Kerr, A.C., Pearce, J.A. and Mitchell, S.F., 2007. Classification of altered volcanic island arc rocks using immobile trace elements: development of the Th–Co discrimination diagram. Journal of Petrology, 48(12): 2341–2357. https://doi.org/10.1093/petrology/egm062

Helvacı, C., Ersoy, E.Y., Sözbilir, H., Erkül, F., Sümer, Ö. and Uzel, B., 2009. Geochemistry and 40Ar/39Ar geochronology of Miocene volcanic rocks from the Karaburun Peninsula: implications for amphibole-bearing lithospheric mantle source. Western Anatolia. Journal of Volcanology and Geothermal Research, 185(3): 181–202. https://doi.org/10.1016/j.jvolgeores.2009.05.016

Hole, M.J., Saunders, A.D., Marriner, G.F.and Tarney, J., 1984. Subduction of pelagic sediments: implications for the origin of Ce-anomalous basalts from the Mariana Islands. Journal of the Geological Society, 141(3): 453–472. https://doi.org/10.1144/gsjgs.141.3.0453

Hollocher, K., Robinson, P., Walsh, E. and Roberts, D., 2012. Geochemistry of amphibolite-facies volcanics and gabbros of the Støren Nappe in extensions west and southwest of Trondheim, Western Gneiss Region, Norway: a key to correlations and paleotectonic settings. American Journal of Science, 312(4): 357–416. https://doi.org/10.2475/04.2012.01

Humphreys, M.C., Blundy, J.D. and Sparks, R.S.J., 2006. Magma evolution and open-system processes at Shiveluch Volcano: Insights from phenocryst zoning. Journal of Petrology, 47(12): 2303–2334. https://doi.org/10.1093/petrology/egl045

Jamshidzaei, A., Torabi, G., Morishita, T., Tamura, A., 2021. Eocene dike swarm and felsic stock in Central Iran: roles of metasomatized mantle wedge and Neo-Tethyan slab. Journal of Geodynamics, 145: 101844. https://doi.org/10.1016/j.jog.2021.101844

Jaques, A.L., Creaser, R.A., Ferguson, J. and Smith, C.B., 1985. A review of the alkaline rocks of Australia. Verhandelinge van die Geologiese Vereniging van Suid-Afrika, 88(2): 311–334. Retrieved August 1, 1985 from https://pubs.geoscienceworld.org/gssa/sajg/article-abstract/88/2/311/122026

Kamber, B.S., Ewart, A., Collerson, K.D., Bruce, M.C. and McDonald, G.D., 2002. Fluid-mobile trace element constraints on the role of slab melting and implications for Archaean crustal growth models. Contributions to Mineralogy and Petrology, 144(1): 38–56. https://doi.org/10.1007/s00410-002-0374-5

Kürkcüoglu, B., 2010. Geochemistry and petrogenesis of basaltic rocks from the Develidağ volcanic complex, Central Anatolia, Turkey. Journal of Asian Earth Sciences, 37(1): 42–51. https://doi.org/10.1016/j.jseaes.2009.07.004

Kuscu, G.G. and Geneli, F., 2010. Review of post-collisional volcanism in the Central Anatolian Volcanic Province (Turkey), with special reference to the Tepekoy Volcanic Complex. International Journal of Earth Sciences, 99(3): 593–621. https://doi.org/10.1007/s00531-008-0402-4

Le Maitre, R.W., 2002. A classification of igneous rocks and glossary of terms, Recommendations of the international union of geological sciences subcommission on the systematics of igneous rocks. Blackwell, Oxford, 193 pp.

Lechmann, A., Burg, J.P., Ulmer, P., Guillong, M. and Faridi, M., 2018. Metasomatized mantle as the source of Mid-Miocene-Quaternary volcanism in NW-Iranian Azerbaijan: Geochronological and geochemical evidence. Lithos, 304(5): 311–328. https://doi.org/10.1016/j.lithos.2018.01.030

Macdonald, R., Hawkesworth, C.J. and Heath, E., 2000. The Lesser Antilles volcanic chain: a study in arc magmatism. Earth-Science Reviews, 49(1–4): 1–76. https://doi.org/10.1016/S0012-8252(99)00069-0

Mahmoudabadi, L., Tabatabaei Manesh, M. and Torabi, Gh., 2012. Petrology and mineral chemistry of Eocene volcanic in the southwest of Jandaq (Northeast of Isfahan). Iranian Journal of Petrology Perology, 3(10): 95–107. (in Persian with English abstract) Retrieved December 23, 2017 from https://ijp.ui.ac.ir/article_16103.html

Malek Mahmoodi, F., Khalili, M. and Mirlohi, A., 2013. The origin of the Bentonite deposits of Tashtab Mountains (Central Iran): Geological, Geochemical, and Stable Isotope evidences. Geopersia, 3(2): 73–86. https://doi.org/10.22059/JGEOPE.2013.36016

Malek Mahmoudi, F. and Khalili, M., 2014. Origin and formation qualification of Khur o Biabanak agates, Isfahan province. Journal of Economic Geology, 6(2): 277–289. (in Persian with English abstract) https://doi.org/10.22067/ECONG.V6I2.44778  

Martin, H. 1999. Adakitic magmas: modern analogues of Archaean granitoids. Lithos, 46(3): 411–429. https://doi.org/10.1016/S0024-4937(98)00076-0

Martin, H., Smithies, R.H., Rapp, R., Moyen, J.F. and Champion, D., 2005. An overview of adakite, tonalite–trondhjemite–granodiorite (TTG), and sanukitoid: relationships and some implications for crustal evolution. Lithos, 79(1–2): 1–24. https://doi.org/10.1016/j.lithos.2004.04.048

Mohajjel, M., Fergusson, C.L. and Sahandi, M.R., 2003. Cretaceous–Tertiary convergence and continental collision, Sanandaj–Sirjan zone, western Iran. Journal of Asian Earth Sciences, 21(4): 397–412. https://doi.org/10.1016/S1367-9120(02)00035-4

Muller, D. and Groves, D.I., 1997. Potassic igneous rocks and associated gold-copper mineralization. Springer, Berlin, 398 pp.

Nosouhian, N., Torabi, G.and Arai, S., 2016. Late Cretaceous dacitic dykes swarm from Central Iran, a trace for amphibolite melting in a subduction zone. Geotectonics, 50(3): 295–312. https://doi.org/10.1134/S0016852116030080

Nikitina, L.P. and Babushkina, M.S., 2021. Nb–Zr–Y Systematics and Thermal Regimes of Subcontinental Lithospheric Mantle in the Archaean: Data from Mantle Xenoliths. Izvestiya, Physics of the Solid Earth, 57(2): 217–231.  https://doi.org/10.1134/S1069351321020075

Pearce, J.A., 1983. Role of the sub-continental lithosphere in magma genesis at active continental margins. In: C.J. Hawkesworth and M.J. Norry (Editors), Continental Basalts and Mantle Xenoliths. Shiva, Nantwich, Cheshire, pp. 230–249. Retrieved June 4, 2017 from http://orca.cardiff.ac.uk/id/eprint/8626

Peccerillo, A., Dallai, L., Frezzotti, M.L. and Kempton, P.D., 2004. Sr–Nd–Pb–O isotopic evidence for decreasing crustal contamination with ongoing magma evolution at Alicudi volcano (Aeolian arc, Italy): implications for style of magma-crust interaction and for mantle source compositions. Lithos, 78(1-2), pp. 217–233. https://doi.org/10.1016/j.lithos.2004.04.040

Pichler, H. and Schmitt-Riegraf, C., 1997. Rock-forming minerals in thin section. Chapman and Hall, London, 217 pp.

Rajabi, S. and Torabi, G., 2012. Petrology of mantle peridotites and volcanic rocks of the narrowest Mesozoic ophiolitic zone from Central Iran (Surk area, Yazd province). Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 265(1): 49–78. https://doi.org/10.1127/0077-7749/2012/0245

Reichert, J., 2007. A metallogenetic model for carbonate-hosted non-sulphide zinc deposits based on observations of Mehdi Abad and Irankuh, Central and Southwestern Iran. PhD.Thesis, Martin-Luther-Universität Halle-Wittenberg, Germany, 304 pp.

Renjith, M.L., 2014. Micro-textures in plagioclase from 1994–1995 eruption, Barren Island Volcano: evidence of dynamic magma plumbing system in the Andaman subduction zone. Geoscience Frontiers, 5(1): 113–126. https://doi.org/10.1016/j.gsf.2013.03.006

Rudnick, R.L. and Gao, S., 2003. Composition of the Continental Crust. In: H.D. Holland and K.K. Turekian (Editors), Treatise on Geochemistry, Elsevier-Pergamon, Oxford, pp. 1–64.

http://dx.doi.org/10.1016/b0-08-043751-6/03016-4

Saccani, E., Delavari, M., Dolati, A., Marroni, M., Pandolfi, L., Chiari, M. and Barbero, E., 2018. New insights into the geodynamics of Neo-Tethys in the Makran area: Evidence from age and petrology of ophiolites from the Coloured Mélange Complex (SE Iran). Gondwana Research, 62: 306–327. https://doi.org/10.1016/j.gr.2017.07.013

Salari, G., Lustrino, M., Ghorbani, M.R., Agostini, S. and Fedele, L., 2021. Petrological characterization of the Cenozoic igneous rocks of the Tafresh area, central Urumieh-Dokhtar Magmatic Arc (Iran). Periodico di Mineralogia, 90(1): 59–83. https://iris.uniroma1.it/retrieve/handle/11573/1535787/1897374/Salari_Petrological_2021.pdf

Sargazi, M., Torabi, G. and Morishita, T., 2019. Petrological characteristics of the Middle Eocene Toveireh pluton (southwest of Jandaq, central Iran): implications for the eastern branch of the Neo-Tethys subduction. Turkish Journal of Earth Sciences, 28(4): 558–588. https://doi.org/10.3906/yer-1807-45

Shahabpour, J., 2007. Island-arc affinity of the Central Iranian volcanic belt. Journal of Asian Earth Sciences, 30(5–6): 652–665. https://doi.org/10.1016/j.jseaes.2007.02.004

Shelley, D., 1993. Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations. Chapman and Hall, University Press, Cambridge, UK. 446 pp.

Shirdashtzadeh, N., Torabi, G. and Arai, S., 2010. Metamorphism and metasomatism in the Jurassic Nain ophiolitic mélange, Central Iran. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 255(3): 255–275. https://doi.org/10.1127/0077-7749/2009/0017

Srivastava, R.K. and Singh, R.K., 2004. Trace element geochemistry and genesis of Precambrian sub-alkaline mafic dikes from the central Indian craton: evidence for mantle metasomatism. Journal of Asian Earth Sciences, 23(3): 373–389. https://doi.org/10.1016/S1367-9120(03)00150-0

Sun, S. S.and McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geological Society of London, Special Publications, 42(1): 313–345. https://doi.org/10.1144/GSL.SP.1989.042.01.19

Takin, M., 1972. Iranian geology and continental drift in the Middle East. Nature, 235(5334): 147–150. https://doi.org/10.1038/235147a0

Tegner, C., Lesher, C.E., Larsen, L.M. and Watt, W.S., 1998. Evidence from the rare-earth element record of mantle melting for cooling of the Tertiary Iceland mantle plume. Nature, 395(3): 591–594. https://doi.org/10.1038/26956

Temizel, İ.and Arslan, M., 2008. Petrology and geochemistry of Tertiary volcanic rocks from the İkizce (Ordu) area, NE Turkey: Implications for the evolution of the eastern Pontide paleo-magmatic arc. Journal of Asian Earth Sciences, 31(4–6): 439–463. https://doi.org/10.1016/j.jseaes.2007.05.004

Torabi, G., 2011. Middle Eocene volcanic shoshonites from western margin of Central-East Iranian Microcontinent (CEIM), a mark of previously subducted CEIM-confining oceanic crust. Petrology, 19(7): 675–689. https://doi.org/10.1134/S0869591111030039

Torabi, G., Arai, S. and Abbasi, H., 2014. Eocene continental dyke swarm from Central Iran (Khur area). Petrology, 22(6): 617–632. https://doi.org/10.1134/S086959111406006X

Torabi, G. and Shirdashtzadeh, N., 2009. Petrology of Eocene volcanic rocks in NE of Ordib (NE of Isfahan Province). Iranian Journal of Crystallography and Mineralogy, 17(4): 519–534 (In Persian with English abstract). Retrieved June 9, 2009 from https://www.sid.ir/FileServer/JF/51713880401

Wang, Q., Xu, J.F., Zhao, Z.H., Bao, Z.W., Xu, W. and Xiong, X.L., 2004. Cretaceous high-potassium intrusive rocks in the Yueshan-Hongzhen area of east China: Adakites in an extensional tectonic regime within a continent. Geochemical Journal, 38(5): 417–434. https://doi.org/10.2343/geochemj.38.417

Whitney, D.L.and Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist, 95(1): 185–187. https://doi.org/10.2138/am.2010.3371

Wilson, B.M., 1989. Igneous petrogenesis a global tectonic approach. Department of Earth sciences, Unwin Hyman Ltd, University of Leeds, London, 466 pp.

Winchester, J.A. and Floyd, P.A., 1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology, 20: 325–343. https://doi.org/10.1016/0009-2541(77)90057-2

Winter J.D., 2001. An introduction to igneous and metamorphic petrology. Prentice Hall publication, New Jersy, 699pp.

Wood, D.A., 1980. The application of a ThHfTa diagram to problems of tectonomagmatic classification and to establishing the nature of crustal contamination of basaltic lavas of the British Tertiary Volcanic Province. Earth and Planetary Science Letters, 50(1): 11–30. https://doi.org/10.1016/0012-821X(80)90116-8

Yousefi, F., Sadeghian, M., Lentz, D.R., Wanhainen, C. and Mills, R.D., 2021. Petrology, petrogenesis, and geochronology review of the Cenozoic adakitic rocks of northeast Iran: Implications for evolution of the northern branch of Neo‐Tethys. Geological Journal, 56(1): 298–315. https://doi.org/10.1002/gj.3943

Yu, Q., Ge, W.C., Zhang, J., Zhao, G.C., Zhang, Y.L. and Yang, H., 2017. Geochronology, petrogenesis and tectonic implication of Late Paleozoic volcanic rocks from the Dashizhai Formation in Inner Mongolia, NE China. Gondwana Research, 43(2): 164–177. https://doi.org/10.1016/j.gr.2016.01.010

Zheira, G., Masoudi, F. and Rahimzadeh, B., 2020. Geochemical constraints on Eocene–Miocene geodynamic and magmatic evolution of the Varan-Naragh area, Urumieh-Dokhtar Magmatic Arc, Iran. Canadian Journal of Earth Sciences, 57(9): 1048–1065.  https://doi.org/10.1139/cjes-2019-0129

Zulkarnain, I., 2009. Geochemical signature of Mesozoic volcanic and granitic rocks in Madina Regency area, North Sumatra, Indonesia, and its tectonic implication. Indonesian Journal of Geoscience, 4(2): 117–131. http://dx.doi.org/10.17014/ijog.vol4no2.20094