Document Type : Original Research Paper


1 Geological Survey of Iran. Tehran, Iran

2 Teacher Training University, Tehran,Iran.


Miveh – Rud area is located 50 km north of Tabriz and 65 km west of Ahar at 36ْْ 33′ 02″to 38ْ, 34′ 52″ N and 46 ْْ 12′ 20″ to 46 ْْ 14′ 35″ E. The oldest rock unit in the area includes a thick sequence of Paleocene sedimentary rocks comprising of sandstone, shale, siltstone, marl and marly limestone that have been intruded by a porphyritic intrusive body and dykes of granodioritic to diabasic composition (probably Oligocene in age). The intrusive rocks resulted in the formation of hornfels, skarn and alteration in Paleocene rocks. All of the mentioned rock units are unconformably covered by Pliocene  age trachyte, trachyandesite. Alteration of potassic, sericitic, argillic, propylithic and silicification types occurred in the subvolcanic and sedimentary rocks, while there is no observed alteration in the volcanic cover. Anomalies of Au, Ag, Sb, Cu, Bi, W and Mo detected by geochemical investigations are confirmed by field evidences.
The anomalies of Sb, Ag, Au and As are located in the northern part, while the Cu, Co, W and Mo anomalies are in the southern part of the area. The degree of the contact metamorphism decreases toward the north and the potassic alteration can be shown mostly in the southern part of the area. This may suggest uplift and erosion of the southern part compared to northern part of the studied area. Composite halos of As, Pb, Ag / Cu, W and Co confirm the results.The mineralization includes formation of skarn, epithermal and sheeted veins. The epithermal veins cut the skarn and other contact metamorphic rocks.                                                                                                                                                                                                           


Bazine, D. and  Hubner, H., 1969- Copper deposits in Iran ,G.S.I. Report, No:13
Beus A. A. and Grigorian S.V., 1977- Geochemical exploration methods for mineral deposits. Trans. by Schneider, Applied publishing
Carig J.R. H., 2005- Classifying,distinguishing and exploring for Intrusion-Related Gold System, The Gangue,p:1-18, In internet.
Cooke, D. R., Mcpall, D. C. and Blom, M. S., 1996- Epithermal gold mineralization , Acupan, Baguio District, Philipines, geology, mineralization, alteration and the thermochemical environment of ore deposition, Econ. Geo. Vol:91, PP:243– 272
Foster, D. and Seccombe, Ph., 2004 -Controls on skarn mineralization and alteration at the Cadia deposits, New South Wales, Australia, Econ. Geo. vol:99, pp:761-788.
Foster,1991- Gold metallogeny and exploration,Pub:Blackie,433p.
Guilbert, J. M. and Park, Ch. F., 1986- The geology of ore deposits, W. H. Freeman and company
Hedenquist, Izard, Arribas & White, 1996- Epithermal gold deposits: style, characteristitics, and exploration, Pub: by: the society of Resource Geology, printed in Japans Tokyo
Hedenquist, J. W. and Henley R.W., 1987- Hydrotherml eruptions of the waiotapu geothermal system,Newlond:Their origion,associated breccias and relation to precious metal mineralization.Eco.Geo. vol:30,pp:1640- 1668.
Karimzadeh, S.A.,2004 - Geological effects of endoskarn formation in the Mazraeh Cu – Fe skarn deposit in northwestern Iran, Geochemistry, Exploration, Environment and Analysis, vol:4, pp:307- 315
Kazmin, Sportshikof, Ricou, Zonenshain and Boulin, 1986- Structure and evolution of the passive margin of the Estern Tethys, Tectonophysics, Vol: 123, PP: 153 – 179
Martin, Izard, A. and Cepedal, M. A., 1997- The Elval deposit an example of late events, Cantabrian Mountains, Spain, In “Mineral Deposits ” , Papunen ( ed ) .
Muller, D. and Groves, D ., 1997- Potassic igneous rocks and associated gold – copper mineralization, Springer – Verlag.
Ramdohr, P.,1980-The ore minerals and their inter growths, 2 nd  ed . pergomon press
Sawkins, F. J., 1990- Metal deposits in relation to plate tectonics, 2 nd ed. springer – verlag 
Shelley, D., 1993- Igneous and metamorphic rocks under the microscope, Chapman and Hall .
Sillito, R. H., 1990- Epithermal models: genetic types, geochemical controls and shallow features, In: IUGS – UNESCO deposits program conferense Ottawa, Canada , Geo. Assoc. Canada, special paper, 40 .
Thompson, M. and Howarth, R. J., 1976- Duplicate analysis in geochemical practice ( 2 parts ). Analyst. 101, 690 – 709
Winkler, H. G. F. , 1976- Petrogenesis of metamorphic rocks, 4 nd. ed. By: springer – verlay. Newyorc Inc .
 Yusta, I. and Velasco, F. and Herrero, J. M., 1998- Anomaly threshold estimation and data normalization using E.D.A statistics: application to lithogeochemical exploration in lower Cretaceous Zn – Pb carbonate – hosted deposits. Northen spain, Applied Geochemistry, Vol : 13, PP:421 – 439 .