Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Genesis of the Miandasht copper deposit, East of Mayamey: Based on geological, mineralogical and geochemical evidences

Document Type : Original Research Paper

Authors
Fatemeh Esmaeili 1
Fardin mousivand 1
Mahmoud Sadeghian 1
Seyed Mehran Heidari 2
1 Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
10.22071/gsj.2022.293355.1919
Abstract
Miandasht copper deposit is located in 110 km east of Shahrood, 24km north west of Abbasabad, and in the Cenozoic volcanic belt of north of Central Iran zone. The major rock units of the study area have Eocene age and include submarine flows (andesite, basalt, and trachyandesit), pyroclastic (tuff breccia and agglomerate) and sedimentary complex (Nomullitic limestone, tuffacous limestone, shale, sandstone and conglomerate). Mineralization in the Miandasht copper deposit occurred as parallel to layering of the host rocks (tuff breccia and agglomerate), and also along with cross- cutting faults of the host rocks in form of stratabound and epigenetic ores. The main ore textures include vein- veinlets, open space filling, disseminated and replacement. The Ores contain primary pyrite, chalcopyrite, chalcocite, bornit, and secondary covellite, chalcocite, malachite, hematite and limonite. The most important wall rock alterations accompanied with mineralization are carbonatic- silicic, sericitic, argillic, and chloritic, and that the amound of carbonatization and silicification increases with closing to mineralization zones. According to geochemical studies, tectonic setting of the deposit was extensional environment formed in a continental margin volcanic arc. Based on essential characteristics of the copper mineralization such as tectonic setting, host rocks, mineralogy, and type of alterations, the Miandasht copper deposit shows many similarities with Manto- type deposits, dominantly formed during orogeny, folding and faulting of the host sequence. It should be mentiond that some charachteristic features of the Miandasht copper deposit including development of argillic alteration, and lack of extensive zeolitic alteration, distinguishes it from other copper deposits in the region including Abbasabad deposit.
Keywords
Copper
Vein
Stratabound
Volcanic
Eocene
Manto
Miandasht
Shahrood

Subjects

Boric, R., Holmgren, C., Wilson, N. S. F., and Zentilli, M., 2002. The geology of the El Soldado manto type Cu (Ag) deposit, central Chile. Hydrothermal Iron Oxide Copper-Gold and related deposits: a global perspective (Porter, TM, pp. 163-184. https://www.geokniga.org/books/4896.
Bornhorst, T.J. and Mathur, R., 2017. Copper Isotope Constraints on the Genesis of the Keweenaw Peninsula Native Copper District, Michigan, USA". Minerals, 7: 185. https://doi.org/10.3390/min7100185.
Boveiri Konari, M., Rastad, E., Kojima, S., and Omran, N.R., 2013. Volcanic red bed-type copper mineralization in the Lower Cretaceous volcano-sedimentary sequence of the Keshtmahaki deposit, southern Sanandaj-Sirjan Zone, Iran”, Neues Jahrbuch für Mineralogie-Abhandlungen, Journal of Mineralogy and Geochemistry, Vol. 190, p. 107-121. DOI: 10.1127/0077-7757/2013/0236.
Brown, A.C., 2006. Genesis of native copper lodes in the Keweenaw district, northern Michigan: A hybrid evolved meteoric and metamorphogenic model. Economic Geology 101: 1437–1444. https://doi.org/10.2113/gsecongeo.101.7.1437.
Cabral, A. R., and Beaudoin, G., 2007. Volcanic red-bed copper mineralisation related to submarine basalt alteration, Mont Alexandre, Quebec Appalachians, Canada." Mineralium Deposita 42(8): 901-912. https://doi.org/10.1007/s00126-007-0141-7.
Carrillo-Rosúa, J., Boyce, A.D., Morales-Ruano, S., Morata, D., Roberts, S., Munizaga, F., and Moreno-Rodríguez, V., 2014. Extremely negative and inhomogeneous sulfur isotope signatures in Cretaceous Chilean manto-type Cu–(Ag) deposits, Coastal Range of central Chile". Ore Geology Reviews 56: 13–24. https://doi.org/10.1016/j.oregeorev.2013.06.013.
Espinoza, S., Véliz, H., Esquivel, J., Arias, J. and Moraga, A., 1996. The cupriferous province of the Coastal Range, northern Chile. Soc. Econ. Geol. Spec. Publ., 5, 19– 32. DOI: https://doi.org/10.5382/SP.05.02.
Ghasemi, H., and Rezaei-Kahkhaei M., 2015. Petrochemistry and tectonic setting of the Davarzan-Abbasabad Eocene volcanic (DAEV) rocks, NE Iran. Mineralogy and Petrology 109: 235–252. https://doi.org/10.1007/s00710-014-0353-3.
Hastie, A. R., Craig, Kerr, A., Pearce, J., and Mitchell, S. F., 2007. Classification of Altered Volcanic Island Arc Rocks Using Immobile Trace Elements: Development of the Th–Co Discrimination Diagram. Journal of Petrology 48 (12). 2341–2357. https://doi.org/10.1093/petrology/egm062.
Kirkham, R.V., 1996. Volcanic red bed copper, Geol. Sur. Of Canada, Canadian mineral deposit types, 8: 241- 252. DOI:https://doi.org/10.1130/DNAG-GNA-P1.241.
Kojima, S., Trista‐Aguilera, D., and Hayashi, K.I., 2009. Genetic Aspects of the Manto-type Copper Deposits Based on Geochemical Studies of North Chilean Deposits”. Resource geology, 59(1), pp. 87-98. https://doi.org/10.1111/j.1751-3928.2008.00081.x.
Lefebure, D.V., and Church, B.N., 1996. Volcanic Redbed Cu, in Selected British Columbia Mineral Deposit Profiles, Volume 1 - Metallic Deposits, Lefebure, D.V., Hõy, T, Editors, British Columbia Ministry of Employment and Investment, Open File 1996-13, pages 5-7. https://www.medellin.unal.edu.co/~rrodriguez/MODELOS/columbia /Volcanic%20Redbed%20Copper.htm.
Lindenberg, H. G., and Jacobshagen, V., 1983. Post-Paleozoic Geology of the Taknar Zone and Adjacent Area, NE Iran, Khorasan.” GSI. Rep 51, 145–163.
Maghfouri, S., Hosseinzadeh, M., Moayyed, M., Movahednia, M., and Flavien, C., 2017. Geology, mineralization and sulfur isotopes geochemistry of the Mari Cu (Ag) Manto-type deposit, northern Zanjan, Iran. Ore Geology Reviews 81: 10- 22. https://doi.org/10.1016/j.oregeorev.2016.10.025.
Pearce, J.A., 1983. Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth, C.J. and Norry, M.J. eds. Continental basalts and mantle xenoliths, Nantwich, Cheshire: Shiva Publications, pp. 230-249. http://orca.cardiff.ac.uk/id/eprint/8626.
Ramírez, L., Palacios, C., Townley, B., Parada, M., Sial, A. N., Fernandez-Turiel, J. L., Gimeno, D., Garcia-Valles, M., and Lehmann, B., 2006. The Mantos Blancos Copper Deposit: An Upper Jurassic Breccia-Style Hydrothermal System in the Coastal Range of Northern Chile.” Mineralium Deposita 41 (3). 246–258. https://doi.org/10.1007/s00126-006-0055-9.
Rossetti, F., Nasrabady, M., Vignaroli, G., Theye, T., Gerdes, A., Razavi, M., and Moin Vaziri, H., 2010. Early Cretaceous migmatitic mafic granulites from the Sabzevar range (NE Iran): implications for the closure of the Mesozoic peri-Tethyan oceans in central Iran. Terra Nova, v 22, pp 26-34.  https://doi.org/10.1111/j.1365-3121.2009.00912.x.
Winchester, J., and Floyd, P., 1977. Geochemical discrimination of different magma series and their diffrantition products using immobile elements. Chemical geology 20: 325- 343. https://doi.org/10.1016/0009-2541(77)90057-2.
Scientific Quarterly Journal of Geosciences
Volume 32, Issue 4 - Serial Number 126
Vol. 32,, Issue.4, Serial No. 126, Winter 2022
Autumn 2022
Pages 305-318