Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Mineral chemistry and petrogenesis of East Nabar skarn, Southwest of Kashan

Document Type : Original Research Paper

Authors
S. M. Tabatabaei Manesh 1
F. Javadi 2
F. S Zohouri2 2
1 Associate Professor, Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
2 M.Sc., Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran
10.22071/gsj.2018.63836
Abstract
The Nabar skarn is located about 35 km southwest of Kashan and within the Urumieh- Dokhtar magmatic belt  and is formed along the contact between limestone of Qom formation with a probably middle to upper Miocene intermediate and basic intrusion body. The main minerals forming this skarn are garnet, clinopyroxene, epidote and accessory minerals are vesuvianite, chlorite, tremolite- actinolite, sphene, quartz and calcite. Ore minerals are pyrrhotite, pyrite with smaller amounts of chalcopyrite, sphalerite and magnetite. According to the presence of magnesium minerals like diopside and calcium minerals such as garnet, vasuvianite and epidote the type of host rock is probably calcite-dolomite. Skarn formation and mineralization in this region was occurred during three development stages. Presence of high temperature anhydrous minerals such as grossular and diopside specifies the formation of the first Stage in these rocks. Stage 2 is associated with the formation of andradite and sphene.  Stage 3 is specified by replacement of anhydrous minerals at temperatures below 470 ° C by hydrous minerals such as tremolite-actinolite, epidote, chlorite and vesuvianite.
Keywords
Oligo-Miocene
Calcium-magnesium skarn
East of Nabar
Urumieh-Dokhtar
References
Bucher, K. and Fery, M., 1994- Petrogenesis of metamorphic rocks. Springer- Verlag.
Deer, W. A. Howie, R. A. and Zussman, J., 1992- An Introduction to the Rock Formation Minerals. Long man, London.
Einaudi, M. T. Meinert, L. D. and Newberry, R. J., 1981- Skarn deposits, Economic Geology 75TH Anniversary volume, p. 317-391.
Einuadi, M. T. and Burt, D. M., 1982- Introduction- terminology, classification and composition of skarn deposits.  Economic Geology 77: 745-754.
Gaspar, M., Knaack, C., Meinert, L. D. and Moretti, R., 2008- REE in skarn systems: A LA-ICP-MS study of garnets from the Crown Jewel gold deposit. Geochimica et cosmochimica acta, 72(1), 185-205.
Kananian, A., Sarjoughian, F., Nadimi, A., Ahmadian, J. and Ling, W., 2014- Geochemical characteristics of the Kuh-e Dom intrusion, Urumieh–Dokhtar Magmatic Arc (Iran): Implications for source regions and magmatic evolution, Journal of Asian Earth Sciences, v. 90. pp. 137-148.
Jacobs, C. K. and Kerrick, D. M., 1981- Devolailisaion equilibria in H2O- CO2- NaCl fluids: an experimental and thermodynamic evolution at evelated pressures and temperatures. American Mineralogist 66: 1135- 1153.
Jamtveit, B., Wogelius, R. A. and Fraser, D. G., 1993- Zonation patterns of skarn garnets: Records of hydrothermal system evolution. Geology, 21(2), 113-116.
Lentz, D. R., 1998- Mineralization intrusion related skarn system, Mineralogical Associated of Canada, Short Course 26: 664 p
Marakuchev, A. A.  and Babrov, A. V., 2005- Metamorphic Petrology, MSU, Moscow, 255 pp.
Meinert, L. D., 1987- Skarn zonation and fluid evolution in the Grounhog mine: central mining district, New Mexico, Economic Geology 82: 523-545.
Meinert, L. D., 1992- Skrans and skarn deposits. Geoscience Canada, 19: 145-162.
Morimoto, N. Fabrise, J. Ferguson, A. Ginzburg, I. V. Ross, M.. Seifert, F. A. Zussman, J. and Aoki, K., 1988- Gottardi, GNomenclature of pyroxene. Mineralogical Magazine 52: 535-555.
Newberry, R. J. Einaudi, M. T. and Eastman, A. H., 1991- Zoning and genesis of the Darwin Pb-Zn-Ag skarn deposit California, A reinterpretation based on new data, Economic Geology 86: 960-982.
Parsapour, A., Khalili, M. and Makizadeh, M., 2009- The behaivour of trace and rare earth elements (REE) during hydrothermal alteration in the Rangan area (Central Iran), Journal of Asian Earth Sciences, v. 34(2). pp. 123-134.
Taylor, B. E. and Liou, J. G., 1978- the low temperature stability of andradite in C-O-H fluids: American Mineralogist, 63, pp. 378- 393.
Tracy, R. J. and Frost, B. R., 1991- Phase equilibrium and hermobaromer of calcareous, ulramafic rocks and iron eformaion (Eds. Kerrick,D. M.) Contact Metamorphism, 26: 207- 289. Rrviews in Mineralogy, America.
Whiteny, D. L. and Evans, B., 2010- Abbreviations for names of rock- forming minerals. American Mineralogist 95: 185- 187
Scientific Quarterly Journal of Geosciences
Volume 27, Issue 107
Volume 26, Issue 107, spring 2018
Spring 2018
Pages 253-264