Geology, alteration, mineralization and geochemical study in copper mine, Golcheshmeh Area, South of Neyshbour
Subject Areas :
Fatemeh
Najmi
1
(Ferdosi University)
Mazaheri
2
Saeid
saadat
3
Azam
Entezari
4
Keywords: Golcheshmeh Andesite Mineralization Altration Cu-manto Michigan.,
Abstract :
The Golcheshmeh copper deposit is located in the NE of Iran (south of Neyshabour) at the margin of Sabzevar Structural Zone. Based on geological and labratory studies, the outcroped rocks consist of Eocene volcanic rocks such as andesite, basaltic- andesite and basalt that associated with the sedimentary and volcanosedimentry rocks including limestone, tuff and breccia. The alteration hosted andesitic layers include carbonatization, propylitization and less argilic and sericitic alterations. The carbonatization zone is the most important alteration in this area. Mineralization mainly occurs in Eocene or younger volcanic rocks as vein- veinlets, amygdaloidal fillings and some replacement and disseminated styles. According to the minerallographical studies, the main ores which contain copper are divided into oxide and sulfide types. Mineralization mainly consists of oxide phases and can be seen as contamination of fracture surfaces and filling pores or voids in the host rocks. The main oxide minerals are malachite, azurite and chrysocolla, and sulfide minerals are chalcocite, covellite, with some minor pyrite, chalcopyrite, bornite, digenit and also native copper. Chalcocite is the most abundant ore sulfide in this area. There are probably two generations of sulfides, the first generation is a primary ore that was formed directly in joints, cracks, and fractures from the ore-containing solution and currently is replaced by covellites; and, the second generation is chalcocite that was probably formed from the conversion of bornite and chalcopyrite through substitution under supergene conditions. In most cases, the observed intergrowth between copper ores suggests the multi-stage mineralization in this region. Geochemical studies of minor and trace elements indicate that the igneous rocks in this region are characterized by the calc-alkaline basalt characteristics and, in terms of tectonic setting, could be attributed to subduction zone-related continental arc magmatism. Moreover, based on the performed geochemical analyses, the copper grade in the region varies from 13668 to 164000 g/ton. On the basis of the results of this study and with respect to some evidences such as tectonic setting, host rock type, structure and texture of ore body, mineral paragenesis, shape of the ore body and associated elements, this area is compared to Manto type deposit located in Chile. Though there are some differences, it is suggested that golcheshmeh copper mine is classified in Cu- Manto type deposit.
- ابولی پور، م.، راستاد، ا. و رشید نژاد عمران، ن.، 1394. کانه‌زایی مس چینه¬کران نوع مانتو در آندزیت پورفیر پیروبیتومن¬دار کشکوئیه رفسنجان، زیرپهنه دهج – ساردوئیه. سی و چهارمین گردهمایی علوم زمین.
- اشرف¬پور، ا.، 1386. ویژگیهای ژئوشیمیایی، کانی¬شناسی و دگرسانی محدوده طلای ارغش، جنوب¬غرب نیشابور. پایان‌نامه دکتری، دانشگاه شهید بهشتی، 137.
- سامانی، ب.، 1381. متالوژنی کانسارهای مس نوع مانتو در ایران. ششمین همایش زمین‌شناسی ایران.
- سعادت، س.، 1391. گزارش نهایی عملیات اکتشاف مرحله دوم منطقه گل‌چشمه کدکن (مس). سازمان صنعت، معدن و تجارت استان خراسان رضوی.
- کيوانفر، م. و عسگري، ع.، 1378. طرح اکتشاف طلا، گزارش نقشه¬هاي زمين¬شناسي - معدني 1:5000 ناحيه ارغش - چشمه زرد، جنوب نيشابور. سازمان زمین‌شناسی و اکتشافات معدنی کشور.
- نادری میقان، ن. و ترشیزیان، ح.، 1377. نقشه زمین‌شناسی1:100000 کدکن. سازمان زمین‌شناسی و اکتشافات معدنی کشور.
- واعظی پور، م. ج. و علوی تهرانی ن.، 1370. نقشه زمین‌شناسی1:250000 تربت‌حیدریه. سازمان زمین‌شناسی و اکتشافات معدنی کشور.
- Berberian, F. and Berberian, M., 1981. Tectono-plutonic episodes in Iran. Zagros–Hindu Kush–Himalaya Geodynamic Evolution. American Geophysical Union and Geological Society of America, Washington, 5–32.
- Cisternas, M.G. and Hermosilla, J., 2006. The role of bitumen in strata-bound copper deposit formation in the Copiapó area, Northern Chile. Mineralium Deposita, 41, 339 – 355.
- Gerlach, D., Cliff, R., Davies, G., Norry, M. and Hodgson N., 1988. Magma sources of the Cape Verde archipelago: isotopic and trace element constraints. Geochim Cosmochim Acta, 52, 2979–2992.
- Irvine T. N. and Baragar W.R.A., 1971. A guide tothe chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences, 8, 523–548.
- Kojima, S., Trista, D., Guilera, A. and Ken-ichiro ayashi, H., 2009. Genetic aspects of the Manto-type copper deposits based on geochemical studies of north Chilean deposits. Resource Geology, 59, (1), 87¬–¬98.
- Maksaev, V. and Zentilli, M., 2002. Chilean strata-bound Cu–(Ag) deposits: an overview. In: Porter, T.M. (Ed.), Hydrothermal Iron oxide copper–gold and related deposits: a global perspective, 2. PGC Publishing, Adelaide, 163–184.
- Morata, D. and Aguirre, L., 2003. Extensional lower Cretaceous volcanism in the coastal range (29°20 - -30°S), Chile: Geochemistry and Petrogenesis. J. South Am. Earth Science., 16, 459 – 476.
- Pearce J. A., Harris N. B. W. and Tindle A. G., 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25, 956-983.
- Pecerillo A. and Taylor S.R., 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to Mineralogy and Petrology, 58, 63–81.
- Richards, J. P., Boyce, A. J. and Pringle, M. S., 2001. Geologic evolution of the Escondida Area, northern Chile, a model for spatial and temporal localization of porphyry Cu mineralization. Economic Geology, 96, 271 – 305.
- Richards, J. P.,and Spoonell, E.T.C., 1989. Evidence of or Cu-(Ag) Mineralization by Magmatic - Meteoric Fluid Mixing in Keweenawan Fissure Veins, Mamainse Point,Ontario. Economic Geology, 84(2), 360– 385.
- Rieger, A., Schwark, L., Cisternas, M. E. and Miller, H., 2008. Genesis and evolution of bitumen in lower Cretaceous Lavas and implications for strata-bound Copper deposits, North Chile. Economic Geology, 103, 387–404.
- Rollinson H., 1983. The geochemistry of mafic and ultramafic ricks from the Archaean greenstone belts of Sierra Leone. Mineral Magazine, 47, 267-280.
- Rollinson H., 1993. Using Geochemical Data, Evaluation, Presentation, Interpretation. Addison-Wesley /Longman, Harlow. England. 352.
- Shand S. J., 1943. Eruptive Rocks; their Genesis, Composition, Classification and their Relation to Ore-deposits". Hafner Publishing Company, New York, 488.
- Stocklin J. and Nabavi M., 1972. Tectonic Map of Iran, Geological Survey of Iran.
- Tristá-Aguilera, D., Barra, F., Ruiz, J., Morata, D., Talavera-Mendoza, O., Kojima, S. and Ferraris, F., 2006. Re–Os isotope systematics for the Lince–Estefanía deposit: constraints on the timing and source of copper mineralization in a stratabound copper deposit, Coastal Cordillera of Northern Chile. Miner Deposita, 41, 99–105.
- Winchester, J.A. and Floyd, P.A., 1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology, 20, 325–343.