Study of mineralization and origin of Pliocene conglomerate hosted strata bound sedimentary Cu mineralization in the Ghareh-Aghaj, Maku
Subject Areas :
Mehadi
Moradi
1
Maghfouri
2
Moaid
3
Ashrati
4
Keywords: Native Copper Conglomerate Stratabound Open Space Filling Maku.,
Abstract :
The study area is located in the Northwest of Iran and North of Khoy Ophiolite Belt. Rocks of the Ghareh-Aghaj region include Qum formation, Upper Red Formation and Pliocene conglomerate. Pliocene rock units consist of siltstone, sandstone (arkose and lithic arenite) and microconglomerate- conglomerate. Pliocene cicroconglomerate- conglomerate hosted strata bound copper mineralization in the Ghareh Aghaj region, but the mineralization is partially seen in the sandstone unit. Much of the mineralization in the study area is open space filling and disseminated. Ore mineralogy of Ghareh-Aghaj is very simple and contains of native copper, cuprite and tenorite. Lack of copper sulfides, the absence of plant fossils as reducing agent, and the non-occurrence of copper replacement instead of plant tissues, occurance of mineralization as the open space filling and cement grain and formation of native copper as the main ore, all represent the dissimilarity of Ghareh-Aghaj Cu mineralization with Redbed type sedimentary copper deposits. Formation of Ghareh-Aghaj copper deposit can be explained as follows: Pore water formation of diagenetic processes within the Upper Red Formation caused the leaching of copper from this sequence and the formation of copper chloride complexes. Increasing of water table caused the development of reducing conditions in the Pliocene conglomerate. Therefore entrance of Copper-bearing fluids caused native copper deposition below the water table. Decreasing of groundwater table and exposure of native copper to the oxidizing conditions caused the replacement of cuprite, malachite and azurite with native copper.
- امینی¬آذر- عباسی ، س. و قدیرزداه ، ا.، 1382. نقشه زمین¬شناسی ماکو، مقیاس 1:100000، سازمان زمین¬شناسی کشور، 4968.
- عشرتی، م.، 1392. مطالعه کانی¬سازی مس رسوبی قره¬آغاج (جنوب¬شرق ماکو- استان آذربایجان¬غربی)، پایان¬نامه کارشناسی¬ارشد، دانشگاه تبریز، 120.
- مهدوی، ا.، راستاد، ا. و حسینی برزی، م.، 1390. کانی¬شناسی، ساخت و بافت و نحوه تشکیل رخداد مس رسوبی- دیاژنتیک مارکشه، تیپ Redbed، در سازند سرخ گردو به سن ژوراسیک، جنوب ایزان مرکزی، فصلنامه علوم زمین، شماره 81، سال بیست و یکم.
Brown, AC (2005). Refinements for footwall red-bed diagenesis in the sedimenthosted stratiform copper deposits model. Economic Geolology 100, 765–771.
Chaves, W.X., 2000. Supergene oxidation of copper deposits: zoning and distribution of copper oxide minerals. Society of Economic Geologists Newsletter, 41.
Durieux, C.G. and Brown, A.C., 2007. Geological context, mineralization, and timing of the Juramento sediment-hosted stratiform copper–silver deposit, Salta district, northwestern Argentina. Mineral Deposita 42: 879–899.
El-Desouky, H.A. Muchez, Ph., Dewaele, S., Boutwood, A. and Tyler, R., 2007. The stratiform copper mineralization of the lufukwe anticline, lufilian foreland, democratic republic congo. geologica belgica ,10,3-4, 148-151.
Hitzman, M. W., 2000. Source basins for sediment-hosted stratiform copper deposits - implications for the structure of the Zambian Copperbelt: Journal of African Earth Sciences, 30, 855-863.
Hitzman, M., Kirkham, R, Broughton, D., Thorson, J., Selly, D., 2005. The sedimenthosted stratiform copper ore system. In: Thompson JFH, Goldfarb RJ, Richards JP (eds). Society of Economic Geologists, 100th Anniversary volume, 609–642.
Macintyre, T.J., 2005. Fault-controlled hydrocarbon-related bleaching and sediment-hosted copper mineralization of the Jurassic Wingate sandstone at the Cashin Mine, Montrose county, Colorado. M.S thesis, Department of Geology and Geological Engineering.
Robb, L., 2005. Introduction to ore-forming processes, first published by Blackwell Publishing.420.
Tucker, M.E, 2001, Sedimentary Petrology, An Introduction to the Origin of Sedimentary Rocks. Second edition.
Van-Wagoner., 1990. Siliciclastic sequence stratigraphy in well logs, cores and outcrops. Am. Ass.Petrol.Geol. Methods in exploration Series No.7, 55.
Walker, TR., 1989. Application of diagenetic alterations in redbeds to the origin of copper in stratiform copper deposits. In: Boyle RW, Brown AC, Jefferson CW, Jowett EC, Kirkham RV (eds) Sediment-hosted stratiform copper deposits. Geol Assoc Can Special Paper, 36,85–96.