Document Type : Original Research Paper


1 Faculty of Basic Sciences, Department of Geology, Tarbiat Modares University,Tehran, Iran

2 College of Science Faculty of Geology, University of Tehran, Tehran, Iran‍2

3 Payame Noor University, Tehran. Iran


Granitic rocks of Malayer plutonic complex contain varieties of enclaves with different shapes, sizes, mineralogy andchemical composition. The interpretation of bivariant geochemical diagrams of major oxides and trace elements  with respect to higher values of some of oxides such as MnO, TiO2, MgO, CaO& FeOt than host rocks in one groups of enclaves and moreover linear trend of these oxides and some of trace elements such as Ni, Cr, V indicate to different nature and mafic source of these enclaves (Mafic type) than host rocks and other enclaves (Felsic type).The study of chemical composition of this enclaves by using of univariant and bivariant statistical methods (bivariant regression analysis, correlation coefficients, cluster analysis and principle component analysis) indicate clear chemical contrast between mafic enclaves with felsic enclaves and granitic host rocks and in other side chemical affinity of felsic enclaves and their host rocks. Distinctive distribution of the majority of oxides and trace elements of mafic enclaves and host rocks and low values for R2 in regression analysis, low value of correlation coefficient of major element oxides and trace elements between enclaves and their host rocks, separate position of samples in cluster pattern and special direction of variants and samples of vectors in bivariant diagram of principle component analysis (PCA) are outputs of different geochemical characteristics of enclaves and host rocks. Moreover this correlates with different trends of each major oxides and trace elements in bivariant geochemical diagram (Harker diagram).


Arvin, M., Dargahi, S., Babaei, A. A., 2004- Petrogenesis and origin of the chenar granitoid stock , NW of Kerman, IRAN: Evidence of neotectonic subduction related arc magmatism.journal of Asian Earth Sciences 24: 105-113.
Barbarin, B., 2005- Mafic magmatic enclaves and mafic rocks associated with some granitoids of the central Sierra Nevada batholith, California: nature, origin, and relations with the hosts‌., Lithos 80 :155– 177.
Blake, S., Fink, J. H., 2000- On the deformation and freezing of enclaves during magma mixing. Journal of Volcanology and Geothermal Research 95:1–8.
Buccianti, A., Peccerillo, A., 1999- The complex nature of potassic and ultrapotassic magmatism in Central-Southern Italy: a multivariate analysis of major element data. In: Lippard S J, Naess A, Sinding-Larsen R (eds) Proceedings of the 5th Annual Conference of the International Association for Mathematical Geology. Tapir, Trondheim, p. 145-150
Coulon, C., Clocchiatti, R., Maury, R. C., Westercamp, D., 1984- Petrology of basaltic xenoliths in andesite to dasite host lava from Martinique, evidence for magma mixing.Bull. Volcano, 47, 705-734.
Debon, F., 1991- Comparative major element chemistry in various ‘‘microgranular enclave–plutonic host’’ pairs. In: Didier, J., Barbarin B. (Eds.), Enclaves and Granite Petrology, Developments in Petrology, vol. 13. Elsevier, Amsterdam, pp. 293–312.
Donaire, T ., Pascual. E ., Pin, C ., Duthou,  J. L., 2005- Microgranular enclaves as evidence of rapid cooling in granitoid rocks: the case of  the Los Pedroches granodiorite, Iberian Massif, Spain,. Contrib Mineral Petrol.149: 247–265.
Gabriel, K. R., 1971- The biplot graphical display of matrices with application to principal component analysis. Biometrika 58: 453-467.
Ghalamghash, J., Mirnejad, H., Rashid, H.,2009- Magma mixing and mingling pattern along Neo-Tethys continental margin, Sanandaj-Sirjan zone, NW Iran: a case study from Alvand pluton, Neues Jahrbuch Fur Minealogie. Accepted paper for 2009.
Kumar, S., Rino, V., 2006- Mineralogy and geochemistry of microgranular enclaves in Palaeoproterozoic Malanjkhand granitoids, central India: evidence of magma mixing, mingling, and chemical equilibration. Contrib.Mineral.Petrol (2006) 152:591–609.
Pearce, J. A., 1983- Role of sub-continental lithosphere in magma genesis at active continental margins. Continental Basalts and Mantle Xenoliths. Shiva, Nantwich, p. 230-249
Sepahi, A. A.,2007- Syn-plutonic dykes and magma mingling: An example from the Alvand plutonic complex, Sanandaj-Sirjan metamorphic belt, Iran. – Geochim. Cosmochim. Acta. (Goldschmidt Conference) 71: A916.
Sepahi, A. A., 2008- Typology and petrogenesis of granitic rocks in the Sanandaj-Sirjan metamorphic belt, Iran: with emphasis on the Alvand plutonic complex. – N. Jb. Geol. Paläont. Abh. 247:295–312.
Silva, M. M.V.G., Neiva, A. M. R., Whitehouse M. J., 2000- Geochemistry of enclaves and host granites from the Nelas area, Central Portugal. Lithos 50, 153–170.
Sun, S. S., McDonough, W. F., 1989- Chemical and isotopic systematic of ocean basalts: Implication for mantle composition and processes, In: Saunders, A. D. and Norry, M. J., Ed., Magmatism in Ocean Basins”, Geological Society of London Special Publication, 42, p. 313-345.
Vernon, R. H., 1983- Restite, xenoliths and microgranitoid enclaves in granites (Clarke Memorial Lecture).  Journal and Proceedings of the Royal Society of New South Wales, 116, 77-103.
Yilmaz, S. S., 2005- Geochemistry of mafic microgranular enclaves in the Tamdere Quartz Monzonite, south of Dereli/Giresun, Eastern Pontides, Turkey. Chemie der Erde.2005 in press.
Zorpi, M. J., Coulon, C., Orsini,J. B., 1991- Hybridization between mafic and felsic magma in calc – alkalin granitoids – a case study northern Sardina, Italy. In: A,Peccerillo (Guest – Editor) Geochemistry of granitoid rockes , chem.Geol. 92,42-86.