Document Type : Original Research Paper


1 Associate Professor, Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran

2 M.Sc. Student, Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran

3 Ph.D., Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran


The Chah Sorbi area is located in the Sistan suture zone. The geology in the Chah Sorbi, from old to young, are flysch type rocks, Zahedan granitoid, subvolcanic granodiorite porphyry, dioritic to granodioritic dikes and recent deposits. The Pb mineralization in the study area occurs as thin and short galena-bearing veins associated with pyrite, quartz, calcite, goethite and limonite. The host rocks are flysch and the subvolcanics that are undergone phyllic and argillic alteration. Propylitic alteration occurs in most dikes in the area and is characterized by chlorite, calcite and epidote. In northeast part of the area, the subvolcanic rocks were intruded by quartz stockworks and was strongly altered. The most intensive and extensive alteration with these rocks is phyllic alteration that is characterized by pyrite, quartz and sericite. Cu mineralization in the stock is characterized by presence of Cu-carbonate and –sulfides. Galena-bearing veins are probably epithermal type in the Chah Sorbi area that is situated in margin of a porphyry Cu system. Major and minor elements were measured in 7 least altered samples from intrusive rocks. The igneous rocks in the study area are metaluminous that are formed from a calc-alkaline magma in a continental margin volcanic arc setting.


Main Subjects

Berberian, M., 1983- Geological map of Zahedan (1:100000). Geological Survey of Tehran, Iran.
Chappell, B. W. and White, A. J. R., 1992- I- and S-type granites in the Lachlan Fold Belt. Transactions of the Royal Society of Edinburgh. Earth sciences 83: 1-26.
Davidson, J. P., 1996- Deciphering mantle and crustal signatures in subduction zone magmatism in Subduction, Top to bottom (Eds. Bebout, G. E., Scholl, D. W., Kirby, S. H., and Platt, J. P.) Geophysical Monograph 96: 251-262, American Geophysical Union.
Harris, N. B. W., Duyverman, H. J. and Almand, D. C., 1983- The trace element and isotope geochemistry of the Sabaloka Igneous Complex, Sudan. Geological Survey of London 140: 245-256.
Harris, N. B. W., Pearce, J. A. and Tindle, A. G., 1986- Geochemical characteristics of collision zone magmatism. In: Collision Tectonics (Eds. Coward, M. P. and Ries, A. C.) Special Publication 19: 67–8, Geological Society, London.
Irvin, T. N. and Bargar, W. R. A., 1971- A guide to chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences 8: 523-548.
Kay, R. W., 1978- Aleutian andesites: melts from subducted Pacific oceanic crust. Journal of Volcanology and Geothermal Research 4: 117-132.
Magna, T., Janousek, V., Kohot, M., Oberli, F. and Wiechert, U., 2010- Fingerprinting sources of orogenic plutonic rocks from Variscan belt with lithium isotopes and possible link to subduction- related origin of some A-type granites. Chemical Geology 274 (1-2): 94-107.
Martin, H., 1993 -The mechanisms of petrogenesis of the Achaean comparison with modern processes. Lithos 30: 373-388.
Middlemost, E. A. K., 1985- Naming materials in the magma/igneous rock system. Earth-Science Reviews 37: 215-224.
Nakamura, N., 1974 - Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites. Geochimca et Cosmochim Acta 38: 757- 775.
Nicholson, K. N., Black, P. M., Hoskin, P. W. O. and Smith, I. E. M., 2004- Silicic volcanism and back-arc extension related to migration of the late Cenozoic Australian- pacific plate boundary. Journal of Volcanology and Geothermal Research 131: 295–306.
Noll, P. D., Newsom, H. E., Leeman, W. P. and Ryan, J. G., 1996- The role of hydrothermal fluids in the production of subduction zone magmas: Evidence from siderophile and chalcophile trace elements and boron: Geochimica et Cosmochimica Acta 60: 587-611.
Pang, K. N., Chung. S. L., Zarrinkoub, M. H., Khatib, M. M., Mohammadi, S. S., Chiu, H. Y., Chu, C. H., Lee, H. Y. and Lo, C. H., 2013- Eocene-Oligocene post-collisional magmatism in the Lut-Sistan region, eastern Iran: magma genesis and tectonic implications. Lithos 180-181: 234-251.
Pearce, J. A. and Norry, M. J., 1983- Role of the sub-continental lithosphere in magma genesis at active continental margins, In: Hawkesworth, Continental Basalts and Mantle Xenoliths, Shiva, Nantwich, 230-249.
Pearce, J. A. and Norry, M. J., 2008- Petrogenetic implication of Ti, Zr, Y and Nb variations in volcanic rocks. Contribution to Mineralogy and Petrology 69: 230-240.
Peccerillo, A. and Taylor, S. R., 1976- Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to Mineralogy and Petrology 58: 63-81.
Sadeghian, M., Bouchez, J. L., Nedelec, A., Siqueira, R. and Valizadeh, M. V., 2005 - The granite pluton of Zahedan (SE Iran): a petrological and magnetic fabric study of a syntectonic sill emplaced in a transtension Setting. Journal of Asian Earth Sciences 25: 301- 327.
Shand, S. J., 1943- Eruptive rocks; their genesis, composition, classification and their relation to ore deposits, with a chapter on meteorites, Revised 2nd edition, Hafner Publishing Co., New York.
Whattam, S. A., Montes, C., McFadden, R. R., Cardona, A., Ramirez, D. and Valencia, V., 2012- Age and origin of earliest adakitic-like magmatism in Panama: implication for the tectonic evolution of the Panamanian magmatic arc system. Lithos 142: 226-244.
Whitney, D. and Evans, B. D., 2010- Abbreviations for names of rock-forming minerals. American Mineralogist 95 (1): 185-187.