Petrography and Geochemistry of the Mafic and Intermediate Rocks of South of Alvand Plutonic Complex, Artyman Area (North of Tuyserkan)

Authors

Department of Geology, Bu Ali Sina University

Abstract

The study area is located near the Artyman village at the southern part of the Alvand plutonic complex. This complex is part of the Sanandaj – Sirjan zone. It is composed of granitoids, mafic and intermediate rocks. Intermediate and mafic rocks are located in the southern part of the region, as separate bodies intruded by granitoids outcrops, as well. These rocks involve olivine gabbro, olivine norite, gabbro, norite, and diorite. Geochemical studies show that mafic rocks are tholeiitic to transitional. In primitive mantle and chondrite normalized diagrams, the studied rocks show enrichment in LREE and depletion in HREE.  Enrichment in LREE and LILE, high ratio of LIL/HFS and negative anomalies of Nb and Ti are characteristic of subduction zone magmatism. The evidence of Nb and Ta negative anomalies and positive Th anomaly for magma with a mantle source was contaminated by crust during ascent. The presence of positive Sr anomaly is consistent with mantle source for studied rocks. The Nb / Ta>1 ratio is indicator of contaminated mantle-derived magmas.
 
 

Keywords


 اشراقى، ص.، 1382،نقشه زمین شناسى تویسرکان با مقیاس  1:100000، سازمان زمین شناسى و اکتشافات کشور.
سپاهی گرو، ع. ا.، 1378،پترولوژی مجموعه پلوتونیک الوند با نگرشی ویژه بر گرانیتوئیدها. پایان نامه دکتری، دانشکده علوم، گروه زمین شناسی، دانشگاه تربیت معلم.
شهبازی، ح.، 1389،پترولوژی مجموعه سنگ­های آذرین و میگماتیت­های کمپلکس الوند و توده نفوذی آلموقلاغ همدان و ارتباط ژنتیکی بین آن­ها، رساله دکتری، دانشگاه شهید بهشتی.
کریم پور، م.، 1388،ژئوشیمی پترولوژی سنگ­های آذرین و کانسارهای ماگمایی، مشهد، دانشگاه فردوسی مشهد، 546ص.
ولى زاده،م.و.، و صادقیان، م.، 1375، پتروژنز چند توده آذرین نفوذى بازیک واقع در نوار دگرگونى سنندج-سیرجان". مجله علوم زمین دانشگاه تهران جلد 22، شماره 1، ص 79-98.
Amidi, S.M., Majidi, B., 1977, Hamadan Quadrangle Map(1/250.000) Geol. Surv. Iran.
Alvaro J.J., Ezzouhairi H., Vennin E., Ribeiro M.L., Clausen S., Charif A., Ait Ayad N., Moreira M.E., 2006, The early-Cambrian Boho volcano of the ElGraraa massif, Moroco; Petrology, Geodynamic setting and coeval sedimentation", Journal of African Earth Science. 44, p:396-410.
Boyenton W.V., 1984,Geochemistry of rare earth element:  meteorite studies. In: Henderson P. (ed), Rare earth element Geochemistry, Elsevier, p: 63-114.
Cox K.G., Bell J.D., Pankhurst R.J., 1979,The interpretation of igneous rocks, London, Allen and Unwin, 450 p.
De La Roche, H., Leterrier, J., Grandclaude, P. & Marchal, M. 1980,A classification of volcanic and plutonic rocks using R1R2-diagram and major element analyses – its relationships with current nomenclature". Chemical Geology 29 p:183–210.
Gill, J. B., 1981, Orogenic andesites and plate tectonics.Springer, Berlin p:43-489.
Green D.H., Ringwood A.E., 1968, Genesis of the calc-alkaline igneous rock suite", Contributions to Mineralogy and Petrology 18, p:105–162.
Green D.H., 1973, Experimental mantle studies on a model upper mantle composition under water saturated and water-unsaturated conditions",Earth and Planetary Science Letters 19, p:37–53.
Hirschmann M.M., Ghiorso M.S., Wasylenki L.E., Asimow P.D., Stolper E.M., 1998, Calculation of peridotite partial melting from thermodynamic models of minerals and melts. I. Method and composition to experiments. Journal of Petrology39, p:1091–1115.
Irvine, T. N. & Baragar, W. R. A., 1971,A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences 8,p: 523–548.
Jahangiri A ., 2007, Post collisional Miocen adakitic volcanism in NW Iran: Geochemical & Geodynamic implications",Journal of Asian Earth Sciences, 30 ,p: 433-447.
Kamber, B. S., Ewart A., Collerson, K. D., Bruce, M. C., McDonald, G. D., 2002, Fluid-mobile trace element constraints on the role of slab melting and implications for Archaean crustal growth models.Contrib Mineral Petrol, 144 p:38–56.
Kretz, R., 1983, Symbols for rock-forming minerals, American Mineralogist, Volume 68, p: 277-279.
 Kuepouo G., Tchouankoue J.P., Nagao T., Sato H., 2006, Transitional tholeiitic basalts in theTertiary Bana volcano–plutonic complex,Cameroon Line", Journal of African Earth Sciences 45, p:318–332.
Lentz, D. R. 1998, Petrogenetic evolution of felsic volcanic sequences associated with Phanerozoic volcanic hosted massive sulfide systems: The role of extensional geodynamics., Ore Geol. Rev. 12, p: 289–327.
Mohajjel, M., Fergusson, C. L., Sahandi, M. R., 2003, Cretaceous-Tertiary convergence and continental collision, Sanandaj-Sirjan Zone, western Iran, J. Asian Earth Sci, 21,p: 397-412.
 Mitchell C.H., Widdowson M., 1991, A geological map of the southern Deccan Traps, India and its structural implications", Journal of Geological Society of London 148, p: 495–505.
Pearce J.A., 1983,Role of the sub-continental lithosphere in magma genesis at active continental margine. In:Hawkseworth C.J. and NorryM.J. (eds.), Continental basalts and mantle xenoliths, Shiva, Nantwich, p: 230-249.
 Rao D.R., Rai H., 2006, Signatures of rift environment in the production of garnet amphibolites and eclogites from Tso-Morari region, Ladakh, India: A geochemical study",Gondwana Research 9, p:512–523.
Rogers J.J.W., Suayah I.B., Edwards J.M., 1984,Trace elements in continental margine magmatism, Part IV. Geol. Sec. Am. Bull 95 ,p:1437-1445.
Rollinson, H.R., 1993. "Using Geochemical Data: Evaluation, Presentation, Inter- pretation".John Wiley & Sons Inc.,New York, pp. 352.
Sepahi, A. A., 2008, Typology and petrogenesis of granitic rocks in the Sanandaj-Sirjan metamorphic belt, Iran: with emphasis on the Alvand plutonic complex, Neues Jahrbuch fuer Geologie und Paleontologie 247(3): 295-312(18). 
 Soesoo, A., 2000, Fraction crystallization of mantle derived melt as a mechanism for some I-Type granite petrogenesis: An example from Iachlan fold belts, Australia Journal of the geological Society,  London, p: 157.
Stolz, A.J., Jochum, K.P., Spettel, B., Hofmann, A.W., 1996, Fluid and melt related enrichment in the subarc mantle: evidence from Nb/Ta variations in island arc basalts". Geology 24, p: 587–590.
Sun, S. S., Mc Donough, W. F., 1989, Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders, A.D., Norry, M.J. (Eds.), Magmatism in the Ocean Basins. Geological Society Special Publication, vol. 42, p: 313–345.
Valizadeh, M.V., Cantagrel, J.M., 1975,Premieres donmees radiometriques (K-Ar et Rb-Sr) sur les Micas du complexe magmatique du mont Alvand, presd Hamadan (Iran occidental) Comptes Rendus de l, Academie des Sciences de paris, Serie D 281 p:1083-1086.
Weaver B.L., Tarney J., 1981, The Scourie dyke suite: petrogenesis and geochemical nature of the Proterozoic subcontinental mantle", ContributionMineralogy Petrology 78, p:175–188.
Wilson, M., 1989, Igneous petrogenesis a global tectonic approach. Unwin Hyman Ltd, London , 466 p.
Winter. John D., 2001,An introduction to igneous and metamorphic petrology". Department of Geology Whitman College , 697 p.
Widdowson M., Pringle M.S., Fernandez O.A., 2000, A post K–T Boundary (Early Palaeocene)age for Deccan-type feeder dykes, Goa, India", Journal of Petrology 41, p:1177–1194.
Wood, D. A.,1980,The application of a Th-Hf-Ta diagram to problems of tectonomagmatic classification and to the nature of crustal contamination of basaltic lavas of the British Tertiary volcanic province". – Earth Planet. Sci. Lett. 50,p:11–30.