Document Type : Original Research Paper

Authors

1 Ph.D. Student, Department of Geology, Faculty of Science, Bu Ali Sina University, Hamadan, Iran

2 Professor, Department of Geology, Faculty of Science, Bu Ali Sina University, Hamadan, Iran

3 Ph.D. Student, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran

4 Professor, Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University, Yamagata, Japan

Abstract

Alvand plutonic body is one of the largest intrusive plutons in northern part of Sanandaj-Sirjan zone which is located in south of Hamadan city. It is composed of porphyroid and leucocratic granitoids, basic intrusive rocks, and abundant enclaves in various sizes and in a variety of forms. Biotites of porphyroid monzogranite, diorite, felsic microgranular enclave, mafic microgranular enclave and surmicaceous enclaves are located in magnesian biotites and biotites of norites in phlogopite field. Orthopyroxenes of norite are clinoenstatite and orthopyroxenes of mafic microgranular enclaves are clinofrosilite. Based on the Ti-in-biotite thermometer, temperature of monzogranite porphyroid is 662 to 734 oC, norite is 688 to 776 oC, diorite is 598 to 724 oC, surmicaceous enclaves temperature is 662 to 687 oC, felsic microgranular enclaves is 694 to 712 oC and mafic microgranolar enclaves is 635 to 737 oC. the enclaves of the Alvand plutonic body and their host rocks are located in the field of calc-alkaline suite. Orthopyroxenes in the norite and mafic microgranular enclaves indicate that rocks of the Alvand intrusive complex are located in the field of high oxygen fugacity rocks. It is in accordance with calc-alkaline property of rocks and is consistent with the subduction-related tectono-magmatic environment.

Keywords

Main Subjects

References
Abdel-Rahman, A.M., 1994 - Nature of biotites from alkaline, calc-alkaline and peraluminous Magmas-  Journal of Petrology 35 (2) 525-541.https://doi.org/10.1093/petrology/35.2.525.
Aliani, F., Sabouri, Z. and Maanijou, M., 2011- Petrography and Geochmistry of Porphyroid Granitoid Rocks in the Alvand Intrusive Complex- Hamadan (Iran), Australian Journal of Basic and Applied Sciences, Vol. 5, No. 12, pp. 2192-2199.
Botcharnikov, R. E., Koepke, J., Holtz, F., McCammon, C. and Wilke, M., 2005 -The effect of water activity on the oxidation and structural state of Fe in a ferro-basaltic melt- Geochimica et Cosmochimica Acta 69-5071-5085. DOI: 10.1016/j.gca.2005.04.023.
Cameron, M. and Papike, J., 1981- Structural and chemical variations in Pyroxenes- American Mineralogist 66: 1-50.
Deer, W.A., Howie, R. A. and Zussman, J., 1991 - An introduction to the Rock Forming Minerals- 17th edition, Longman, London. DOI: 10.3749/canmin.51.4.663.
Dymek, R.F., 1983- Titanium and interlayer cation substitutions in biotite from high gread Gneisses, west Greenland-  American mineralogist 68 (9-10) 880-889.https://pubs.geoscienceworld.org › msa › ammin › article › titanium-aluminu.
Eshraghi, S. A. and Mohammadi Gharai, M., 2003 - Geological Map of Tuyserkan 1/100000, Geological Survey and Mineral exploration of Iran, Tehran.
France, L., Koepke, J., IIdefonse, B., Cichy, S. B. and Deschamps, F., 2010- Hydrous partial melting in the sheeted dike complex at fast spreading ridges: Experimental and natural observations.(DOI:10.1007/s00410-010-0502-6).
Henry, D. J. and Guidotti, C. V. and Thomson, J. A., 2005- The Ti-saturation surface for low-to-medium pressure metapelitic biotites: implications for geothermometry and Ti-substi-tution mechanisms- American Mineralogist, 90 316-328.DOI:10.2138/am.2005.1498.
Karimpour, M. H., Farmer L., Ashouri C. and Saadat S., 2006 - Major, Trace and REE geochemistry of Paleo-Tethys Collision-Related Granitoids from Mashhad, Iran. Journal of Sciences, Islamic Republic of Iran 17(2): 127-145.
Kilinc, A., Carmichael, I. S. E., Rivers, M. L. and Sark, R. O., 1983 -The ferric-ferrous ration of natural silicate liquiids equilibrated in air- Contributions to Mineralogy and Petrology 83: 136-140.DOI. https://doi.org/10.1007/BF00373086.
Kress, V. C. and Carmichael, I. S. E., 1991 - The compressibility of silicate Liquids containing Fe2O3 and the effect of composition, temperature, oxygen fugacity and pressure on their redox states.Contributions to Mineralogy and Petrology, Volume 108, Issue 1-2, pp. 82-92  DOI:10.1007/BF00307328.
Le Bas, N. J., 1962 -The role of aluminium in igneous clinopyroxenes with relation to their parentage. American Journal of Science 260: 267-288.
Moretti, R., 2009- Polymerization, basicity, oxidation state and their role in ionic modeling of silicate melts- Geophysics 48: 583-608. DOI: 10.4401/ag-3221.
Morimoto, N., Fabrices, J., Ferguson, A. K., Ginzburg, I. V., Ross, M., Seifer, F. A., Zussman, J., Akoi, K., Gottard, G., 1988- Nomenclature of pyroxenes- Mineralogical Magazine. 52:535-550. DOI:10.1180/minmag.1988.052.367.15.
Nachit, H., 1986- Contribution d l'etudeanalytique et experimentale des biotites des granitoides. These de doctorat, Universite de Bretagne Oceidentale, Brest (France).
Nachit, H., Ibhi, A., Abia, E.H. and Ohoud, M.B., 2005- Discrimination between Primary magmatic biotites, reequilibrated biotites and neoformed biotites, ComptesRendus Geoscience 337: 1415-1420. DOI: 10.1016/j.crte.2005.09.002.
Nachit, H., Rezfimahefa, N., Stussi, J.M., Carron, J.P., 1985 - Composition chemique des biotites et typologie magmatique des granitoides- Comptes Rendus Hebdomadaires de 1 Academic des Sciensces 301(11) 813-818.
Ottonello, G. Moretti, R. Marini, L. and Zuccolini, M. V., 2001 - Oxidation state of iron in silicate glasses and melts: a thermochemical model- Chemical Geology 174: 157-179.DOI:10.1016/S0009-2541(00)00314-4.
Schweitzer, E.L., Papike, J.J. and Bence, A.E., 1978 - Clinopyroxenes from deep sea basalts: A statistical analysis. Geophysical Research Letters, Volume 5, Issue 7, p. 573-57 . DOI:10.1029/GL005i007p00573.
Sepahi, A.A., 2008 - Typology and Petrogenesis of Granitic Rocks in the Sanandaj-Sirjan Metamorphic Belt, Iran, with Emphasis on the Alvandplutonic Complex- N, Jb, Geol. Palaont, Abh, Stuttgart, Vol. 247, No.3,pp: 295-312. DOI: 10.1127/0077-7749/2008/0247-0295.
Shahbazi, H., Siebel, W., Pourmoafee, M., Ghorbani, M, Sepahi, A.A., Vousoughi-Abedini, M., Shang, C.K., 2010-Geochemisttry and U-Pb Zircon Geochronology of the Alvand Plutonic Complex in Sanandaj-Sirjan Zone (Iran)-  New Evidence For Jurassic Magmatism, Journal of Asian Erth Sciences, Vol. 39, No. 6, pp: 668-683. DOI: 10.1016/j.jseaes.2010.04.014.
Shabani, A.A.T., Masoudi, F. and Tecce, F., 2010 - An investigation on biotite composition from Mashhad granitoid rocks, NW Iran , Journal of Science of Islamic Republic of Iran, 21(4)  321-331.
Stӧcklin, J., 1968 - Structural history and tectonics of Iran: a review- American Association of Petroleum Geologists Bulletin 52: 1229-1258. https://doi.org/10.1306/5D25C4A5-16C1-11D7-8645000102C1865D.
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 1, Academie des Sciences de paris, Serie D 281 p: 1083-1086.