Petrogenesis and Geochemical Properties of Dome-shaped Subvolcanic Complexes in Southwest of Shahrab (Northeast of Isfahan)

Mohammad Ali Arian, Alikhan Nasr Isfahani, Afsaneh Ranjbar


The studied area is located in southwest of Shahrab village near Ardestan city. This zone is part of Uremia- Dokhtar magmatic belt. Outcrops composed of rhyolite and rhyodacite dome-shaped volcanic complexes are scattered in the studied area; some of which are exploited as ornamental stone. The main rhyolite minerals include quartz, plagioclase and alkali feldspar. Minor minerals include Apatite, Sphene and opaque minerals and of the secondary minerals in these rocks Christie, Chlorite, Epidote and calcite could be mentioned. Calcite exists in rocks in form of filler of micro-fissures. The ignimbrite presence in this group of rocks in form of xenolith is one of the features of this rock group. The main primary texture in rhyolite and rhyodacite is porphyritic and the secondary texture includes pull-apart, snow flake and spherulitic textures. Geochemical evidences indicate that these rocks are sub-alkaline, Calc-alkaline compositions with high potassium and meta-alumina. These rocks have negative EU anomaly that is the feature of acidic igneous rocks. The studied rocks show high enrichment of LREE and LILE elements. The primary magmas constituting these rocks have mantel origin raised under extreme compressional conditions on continental crust in a tectonic environment of volcanic arc. It seems that these rocks are formed in connection with continuance of volcanic activities associated with subduction of Neolithic oceanic plate beneath continental plate of Iran. 


Ardestan; sub-volcanic rocks; Calc-alkaline; Volcanic arc

Full Text:



Abdalla, H. M., Matsued, H., Obeid, M. A. and Takahashi, R. (2008) Chemistry of cassiterite in rare metal granitoids and the associated rocks in the Eastern Desert, Egypt. Journal of Mineralogical and Petrological Sciences,103, 318-326.

Antipin, V. S., Andreeva, I. A., Kovalenko, V. I. and Kuznetsov, V. A: (2009) Geochemical specifics of ongonites in the Ary-Bulak Massif, Eastern Transbaikalia. Petrology,17, 558-569.

Brown, G. C., Thorpe, R. S. and W~bb, P. C. (1984) The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources. Journal of Geological Society London,141, 413- 426.

Condie, K. C. (I 989) Geochemical changes in basalts and andesites across the Archean-Proterozoic boundary: Identification and significance. Lithos, 23, 1- 18.

Cox, K. G., Bell, J. D. and Pankhurst, R, J., I 979. The interpretation of igneous rocks. George Allen and Unwin 45.

Darvishzadeh, A. (1984). Principles of Volcanology. Tehran University Press, Tehran. Radfar, J. (1997) Geological map of Ardestan 1: 1000000. Publications of Geological Survey and Mineral Exploration of Iran.

Emami, M. H. Khalatbari, M. Vosoughi Abedini, M. (1992). Organization of Geological Survey and Mineral Exploration of Iran) Tertiary Plutonium of Ardestan and Central Iran. Quarterly 4, 23-28.

Green, N. L. (2006) Influence of slab thermal structure on basalt source regions and melting conditions. Lithos, 87, 23- 49.

Harris, N. B. W., Pearce, J. A. and Tindle, A. G. (1986)

Geochemical characteristics of collision-zone magmatism. In: Coward, M. P. and Ries, A. C. (Eds.). Collision Tectonics. Geological Society. London, Special publication, 19, 67-81.

Irvine, T. N. and Baragar, W.R. A. (1971) A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences, 8, 523-548.

Kumral, M., Caban, H., Gedikoglu, A. and Kilinc, A. (2006) Petrology and geochemistry of augite trachytes and porphyritic trachytes from the Golcuk volcanic region. Journal of Asian Earth Sciences, 27, 707-716.

Le Maitre, R. W., Bateman, P., Dudek, A. Geller, J. (1989). A classification of igneous rocks and glossary of terms. Blackwell, Oxford.

Maniar, P. D. and Piccoli P. M. (1989) Tectonic discrimination of granitoids, Geological Society of America Bulletin, 101, 635-643.

Martin, H. (1993) The Archaean grey gneisses and the genesis of the continental crust. In: Condie, K. C.(Eds.): The Achaean Crustal.Evolution. Elsevier, Amsterdam.

Middlemost, E.A.K. (1985). Magmas and Magmatic Rocks. Longman, London.

Miskovic, A. and Francis, D. (2006) Interaction between mantle - derived and crustal calc alkaline magmas in the Petrogenesis alkaline of the Sifton Range. Lithos, 87, 204-134.

Moin Vaziri, H. (1996) A Preface on Magmatism in Iran. Tarbiat Moallem University Press.

Moin Vaziri, H. (2004) Several Milestones in the History of Tectonomagmatic of Iran. Geological Survey and Mineral Exploration of Iran, Quarterly, 50-49, 32-39.

Nakamura, N. (1974) Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrite. Geochimca et Cosmochimica Acta, 38, 757-775.

Nasr Isfahani, A. Ahmadi, M. (2008) Lithology of Shoshonitic lavas in the south of Eshin (east of Isfahan). Journal of Basic Sciences of Islamic Azad University, Science and Research Branch of Tehran, 69, 89-98.

Nasr Isfahani, A. Hajian, M (2007) Geology of Manganese Bagan Ore (Southern Ardestan) with an emphasis on petrological properties of felsic volcanic rocks. First International Congress on Applied Geology, Mashhad.

Parada, M. A., Nystrom, J. 0. and Levi, B. (1999) Multiple source for the Coastal Batholith of Central Chile: geochemical a Sr-Nd isotopic evidence and tectonic implication. Lithos, 46, 505-521.

Qorbani, M. (2003). The Principles of Volcanology with an Attitude toward Volcanoes in Iran. Aryan Zamin publication.

Raymond, L. A. (2002) The Study of igneous Sedimentary and Metamorphic Rocks. McGraw Hill.

Rollinson, H. R. (1993) Using Geochemical Data: Evaluation, Presentation, Interpretation. John Wiley and Sons.

Sajona, F. G., Maury, R. C., Bellon, H., Cotton, J. and Defant, M. (1996) High field strength elements of Pliocene-Pleistocene island-arc basalts Zamboanga Peninsula, Western Mindanao (Philippines). Journal of Petrology, 37, 693-726.

Scharidl, E. S. and Gorton, M. P. (2002) Application of high field strength elements to discriminate tectonic setting in VMS environments. Economic Geology, 97, 629-642.

Shahabpour, J. (2005) Tectonic evolution of the orogenic belt in the region located between Kerman and Neyriz. Journal of Asian Earth Sciences, 24, 405-417.

Shelly, D. (1993) Microscopic Study oflgneous and Metamorphic rocks, Chapman and Hall, London.

Sun, S. S. and McDonough, W. F. (1989) Chemical and isotopic systematic of qceanic basalts: implications for mantle composition and processes. In: Saunders, A. D. and Norry M. J. (Eds.): Magmatism in ocean basins. Geological Society of London. Special Publication,42, 313-345.

Tetsuichi, T., Yuji, 0., Kazuki, N.,Yasushi, W. (1999) Petrology of a mantle derived rhyolite, Hokkaido, Japan. Chemical Geology,160, 425-445.

Thompson, A. B.(1982) Magmatic of the British Tertiary volcanic

province. Scottish Journal of Geology,18, 50-107.

Watter, S. W.A and Etminan, H. (1973) Manganese in Iran from contribution to the Geology of mineral Resources in Iran Geological Survey of Iran.

Wilson, M. (1989) ligneous Petrogenesis: A Global Tectonic Approach. Chapman and Hall, London.

Zhu, X., Mo, X., White N.C. Zhang, B, Sun, M., Wang, S., Zhao, S. and Yang, Y. (2009) Geology and metallogenetic setting of the habo porohyry Cu (Mo-Au) deposit Yunnan. Acta Geologica Sinica, 83, 1915-1928.


Article Metrics

Metrics Loading ...

Metrics powered by PLOS ALM


  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

© 2017 Ukrainian Journal of Ecology. ISSN 2520-2138