OJG  Vol.4 No.8 , August 2014
Petrography, Temperature Measurement, and Economic Evaluation of Granitoid Pluton of Qohrud-Kashan Using EPMA, XRD, and XRF Analysis
Abstract: The area which is being studied is located in northwest of Isfahan, 30 kilometers south of Kashan, and southern section of Qmasar. The longitude of the area of study is 51°19'13"E to 51°26'26"E and its latitude is 33°34'24"N to 33°44'24"N. Based on microscopic observations, modal analysis, and also based on their location in the Streckeisen [QAPF], both the stones of the Qohrud batholitic mass themselves and its enclaves are more in quartz monzonite ranges. Granitoid also have quartz monzonite enclaves. These enclaves are from both microgranular mafic and Autolith types which indicate the mixing of two magmas. At the center of the pluton, there are indications of existence of main magma reservoir and magma mixing. In terms of mineralogy, the granitoid rocks of the area very much resemble I-type. The zoning of the plagioclases is both the normal kind and variation invert and has andesine general composition. The probed biotite sample contains iron and belongs to a granitic sample from the center of the mass. Also, the ranking graph indicates biotite as the source of recrystallization for the analyzed points. The probed biotite sample of the Qohrud area showed formation temperature of 730 degrees centigrade. According to the Rb and Sr contents, the source of the rocks is at depths of 20 to 30 kilometers from the earth’s surface that are depending on the subduction zone. The formation temperature of the specimens of the Qohrud batholithic mass is mostly between 900 to 1000 degrees centigrade. [At] the center of the mass (around Qahrud), the amount of molybdenum is higher than the economic limit.
Cite this paper: Ardalan, A. , Khodadady, M. , Emami, M. , Zakariaie, J. , Razavi, M. and Yazdi, A. (2014) Petrography, Temperature Measurement, and Economic Evaluation of Granitoid Pluton of Qohrud-Kashan Using EPMA, XRD, and XRF Analysis. Open Journal of Geology, 4, 406-424. doi: 10.4236/ojg.2014.48032.

[1]   Zahedi, M., Radfar, J., Alaei Mahabadi, S., Hashem Emami, M., Hadadian, M., Afsharianzadeh, E.M. and Farshchi, Z. (1992) Iranian Geology Organization, Kashan 1:100000 Geological Map, No. 6257.

[2]   Streckeisen, A.L. (1973) Plutonic Rocks: Classification and Nomenclature Recommended by the I.U.G.S. Sub-Commission on the Systematic of Igneous. Rocks, Geo, Times, 18, 26-30.

[3]   Allahyaru, K., Vosoughi, M. and Moayad, M. (2002) Bi-Generational Biotites and Zircons, a Witness for the Source of the Misho Granitoid Anatectic Mass. Collection of Article of the Sixth Seminar of the Iranian Geological Society, Shahid Bahonar University of Kerman.

[4]   Rutherford, M.J. and Devin, J. (1988) The May 18, (1980) Eruption of Mount St. Helen, 3. Stability and Chemistry of Amphibole in the Magma Chamber. Journal of Geological Research, 93, 11949-11956.

[5]   Vernon, R.H. (2007) Problems in Identifying Restite in S-Type Granites of Southeastern Australia, with Speculations on Sources of Magma and Enclaves. Canadian Mineralogist, 45, 147-178.

[6]   Didier, J. (1987) Contribution of Enclaves Studies to the Understanding of Origin and Evolution of Granitic Magmas. Geologische Rundschau, 76, 41-50.

[7]   Sheykhzakariaei, J. and Ghafari Fakherm, M. (2008) Variety of Enclaves and Field Evidences, Microscopy of Magma Integration in Batholithic Granitoid Masses of South Qarveh. Islamic Azad University Scientific Gazette, 18.

[8]   Torkian, A. (2001) Translation Clark D.B., 1992, Granitoid Rocjs. Noor Elm Hamedan Publications, 242 p.

[9]   Clarke, D.B. (1992) Granitoid Rocks. Chapman and Hall, London, 283.

[10]   Hibbard, M.J. (1995) Petrography to Petrogenesis. Prentice Hall, New Jersey, 587 p.

[11]   Nelson, S.T. and Montana, A. (1992) Sieve-Textured Plagioclase in Volcanic Rocks Produced by Rapid Decompression. American Mineralogist, 77, 1242-1249.

[12]   Gill, R. (2010) Igneous Rocks and Processes, Apractical Guide. Wiley & Sons Publication, Hoboken, 428 p.

[13]   Jafari, S. (2000) Review of Petrography, Petrology, and Geochemistry of the Kashan Qohrud Batholithic Mass. MA. Thesis, 200 p.

[14]   Farokhpei, H., Shamsipour, R. and Nassresfahani, E. (2010) Varendan Qaza’aan Batholithic Mass. The 4th National Geology Seminar of Payam-e-Noor University.

[15]   Debon, F. and Le Fort, P. (1983) A Chemical-Mineralogical Classification of Common Plutonic Rocks and Associations. Transactions of the Royal Society of Edinburgh: Earth Sciences, 73, 135-149.

[16]   Vazirim, M. and Ahmadi, E. (2004) Petrography and Petrology of Volcanic Rocks. Tarbiat Moalem University, Tehran, 10-120.

[17]   Nachit, H., Razafimahefa, N., Stussi, J.M. and Caron, J.P. (1985) Composition chimique des Biotites et typologie magmatique des granitoids. C.R. Acadomic Sciences Paris, Series 2, 301, 813-818.

[18]   Foster, M.D. (1960) Interpretation of the Composition of Trioc Tahedral Micas. US Geological Survey, Professional Paper 354 B, 11-49.

[19]   Henry, D.J., Guidittic, C.V. and Thomson, J.A. (2005) The Ti-Saturation Surface for Low-to-Medium Pressure Metapelitic Biotite: Implications for Geothermometry and Ti-Substitution Mechanisms. Journal of American Mineralogist, 90, 316-328.

[20]   Condie, K.C. (1976) Plate Tectonics and Crustal Evolution. Pergamon Press Inc., Oxford, 145-174.

[21]   Chappell, B.W. and Stephens, W.E. (1988) Origin of Infracrustal (I-Type) Granite Magmas. Transactions of the Royal Society of Edinburgh: Earth Sciences, 79, 71-86.

[22]   Shelly, D. (1993) Igneous and Metamorphic Rocks under the Microscop. Chapman and Hall, London, 445.

[23]   Asiabanha, E. (1995) Microscopic Study of the Volcanic Rocks and Alteration. Imam Khomeini International University, Qazvin, 630 p.

[24]   Harris, N.B.W., Pearce J.A. and Tindle, A.G. (1986) Geochemical Characteristics of Collision—Zone Magmatism. In: Coward, M.P. and Reis, A.C., Eds., Collision Tectonics, Geological Society London Special Publications, London, 67-81.

[25]   Shahbpour, J. (2010) Economic Geology. Publications of Shahid Bahonar University of Kerman, Kerman, 3rd Edition, 543 p.

[26]   Internet Database of the Isfahan Province Roads (2012)

[27]   Iranian Organization for Geology and Quarry Expedition (2012) Department of Geology of Tehran.

[28]   Harrison, T.M. and Watson, E.B. (1984) The Behavior of Apatite during Crustal Anatexis: Equilibrium and Kinetic Considerations. Geochimica et Cosmochimica Acta, 48, 1467-1477.

[29]   Deer, W.A., Howie, R.A. and Zussman, J. (1992) An Introduction to the Rock Forming Minerals. 2nd Editions, Longman Scientific & Technical, London, 696.