Akhtarchi deposit with carbonated host: geology, mineralography and electron microprobe (EPMA) studies
Subject Areas :Mohammadamin Naziri 1 * , Iraj Rassa 2 , Mohammad yazdi 3
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Keywords: Akhtarchi, Sanandaj-Sirjan zone, Carlin type, Carbonated host rock, Gold,
Abstract :
The Akhtarchi gold deposit with carbonate host is located in southeast Mahallat, Markazi province, and Sanandaj-Sirjan structural zone. Host rock includes impure carbonated rocks with Permian age which is affected by dissolution (decarbonatization) and brecciation in mineralized zones. Mineralization is controlled structurally and there is spatial relation between faults and mineralization. The most important alterations include silicification, hematization, dolomitization, decarbonatization and argillic. Gold occurrence is seen as three forms, associated with iron oxides, siliceous (jasperoid) and placer. There are five types of mineralized veins in the area including gold bearing iron oxide, gold bearing siliceous -iron oxide, copper bearing siliceous-iron oxide, siliceous-pyritic and milky quartz veins. Microscopic studies and microprobe analyses show that gold exists in this deposit as microscopic grains inside iron oxides and as submicroscopic in iron oxides, iron-manganese oxides, carbonates, copper bearing secondary minerals and sulfides. Based on geological, structural, alteration, mineralography and microprobe studies, properties of Akhtarchi deposit have the most similarity with Carlin type gold deposit.
آقانباتی، ع.، 1383. زمینشناسی ایران، سازمان زمینشناسی ایران، تهران. 586.
ثابتور نامخواستی، ح.، میرنژاد، ح.، احمدی، ا. و سجادی آلهاشم، س.ف.، 1392. چگونگی شکل‌گیری کانسار منگنز بزنین، اردستان (اصفهان) براساس بررسی‌های میکروسکوپی و داده‌های ریزکاوش الکترونی. مجله بلورشناسی و کانیشناسی ایران، 21، 537-548.
جزیی، م.ا.، کریمپور، م.ح. و ملکزاده شفارودی، ا.، 1395. بلورشناسی، کانیشناسی و ژئوشیمی گالن، کانسار سرب نخلک (اصفهان). مجله بلورشناسی و کانیشناسی ایران، 24، 4-18.
رحمانی جوانمرد، س.، طهماسبی، ز.، دینگ، ز. و احمدی خلجی، ا.، 1399. بررسی رفتار زمینشیمیایی عناصر اصلی و کمیاب خاکی در گارنتهای موجود در سنگهای دگرگونی منطقه بروجرد (پهنه سنندج-سیرجان). فصلنامه زمینشناسی ایران، 53، 87-107.
سخدری، م.، یزدی، م. و بهزادی، م.، 1390. ژئوشيمي، دگرساني و کانيزايي طلا در منطقه شانق، دليجان (اصفهان). مجله علوم زمین، 81، 75-80.
شرکت مشاور پارسی کان کاو، 1393. گزارش پایان اکتشاف منطقه اخترچی، 393.
طورچی، م. و نصراصفهانی، ع.، 1376. بررسی زمینشناسی کانسارهای انجیره اصفهان. مجله بلورشناسی و کانیشناسی ایران، 5، 83-96.
مهرابی، ب. و طالعفاضل، ا.، 1395. کانیشناسی و پاراژنز کانسنگ Cu-Au-Bi منطقه‌ی پی‌جویی کوه‌دم (شمالشرق اردستان)، مجموعه‌ی فلززایی انارک. مجله بلورشناسی و کانیشناسی ایران، 24، 635-646.
مهوری، ر.، نقرهییان، م.، مکیزاده، م.ا. و پورنقشبند، غ.ر.، 1390. بررسی کانیشناسی و ژئوشیمیایی کانسار بنتونیت مهرآباد (شرق اصفهان). مجله بلورشناسی و کانیشناسی ایران، 19، 3-14.
نظیری، م.ا.، 1390. اکتشافات لیتوشیمیایی طلا در آنومالی شماره 3 کانسار کوه دم، اردستان، اصفهان. پایان-نامه کارشناسی ارشد، دانشگاه پیام نور، تهران، 186
نوریان رامشه، ز.، یزدی، م.، رسا، ا. و مسعودی، ف.، 1395. توزيع طلا و عناصر فرعي در پيريت کانسار سنجده، منطقه معدني موته، بر اساس نتايج آناليز الکترون مايکروپروب. مجله زمینشناسی ایران، 10، 59-70.
Arehart, G.B., 1996. Characteristic and origin of sediment-hosted disseminated gold deposits: a review. Ore Geology Reviews, 11, 383-403.
Arehart, G.B., Chryssoulis, S.L. and Kesler, S.E., 1993. Gold and arsenic in iron sulfides from sediment-hosted disseminated gold deposits: Implications for depositional processes. Economic Geology, 88, 171-185.
Cabri, L.J., Chryssoulis, S.L., DE Villiers, J. P.R., Laflamme, J.H.G. and Buseck, R., 1989. The nature of “invisible” gold in arsenopyrite. The Canadian Mineralogist, 27, 353-362.
Christensen, O.D., 1996. Carlin Trend Geologic Overview, in Field Trip Guide Book Compendium, Geology and Ore Deposits of the American Cordillera, S.M. Green and E. Struhsacker, Editors, Geological Society of Nevada, 147-156.
Christensen, O.D., 1993. Carlin Trend Geologic Overview; in Gold Deposits of the Carlin Trend, Nevada, O.D. Christensen, Editor, Society of Economic Geologists. Guide book Series, 18, 12-26.
Clark Maroun, L.R., Cline, J., Simon, A., Anderson, P. and Muntean, J.L., 2017. High-Grade Gold Deposition and Collapse Breccia Formation, Cortez Hills Carlin-Type Gold Deposit, Nevada, USA. Economic Geology, 4, 112, 707-740.
Essman, J., 2010. Rain revisited: New structural and stratigraphic insights and their implications for Carlin-type deposits, In Steininger, R., Pennell, B. (Eds.), Great Basin Evolution and Metallogeny. Geological Society of Nevada. Symposium Proceeding, 511-535.
Evans, J.G., 1980. Geology of the rodeo Creek NE and Welches Canyon quadrangles, Eureka County, Nevada, US geology survey bulletin, 1473, 81.Gondwana Research, 40, 43-57.
Fergusson, C.L., Nutman, A. P., Mohajjel, M. and Bennett, V., 2016. The Sanandaj–Sirjan zone in the Neo-Tethyan suture, western Iran: Zircon U–Pb evidence of late Palaeozoic rifting of northern Gondwana and mid-Jurassic orogenesis. Gondwana Research, 40, 3-57.
Hausen, D.M., Ahlrichs, J.W., Mueller, W. and Park, W.C., 1986. Particulate gold occurrences in three Carlin carbonaceous ores, In Process Mineralogy VI , ed. D. Hagni, TMS, Warrendale, PA, 193-214.
Hausen, D.M., 1981. Process mineralogy of auriferous pyritic ores at Carlin, Nevada, In Hausen, D.M. and Park, W.C., eds. Process Mineralogy, TMS, Warrendale, PA, 271-289.
Heitt, D.G., Dunbar, W.W., Thompson, T.B. and Jackson, R.G., 2003. Geology and geochemistry of the Deep Star gold deposit, Carlin Trend, Nevada. Economic Geology, 95, 1107-1135.
Hickey, K.A., Ahmed, A.D., Barker, S. and Leonardson, R., 2014. Fault-Controlled Lateral Fluid Flow Underneath and Into a Carlin-Type Gold Deposit: Isotopic and Geochemical Footprints. Economic Geology, 109, 1431-1460.
Hofstra, A.H. and Cline, J.S., 2000. Characteristic and models for Carlin-type gold deposits. Economic Geology Reviews, 13, 163-220.
Leonardson, R.W., 2010. Barrick Cortez Gold Acres structure: in Steininger, R.C. and Pennell, B., eds., Geological Society of Nevada Symposium 2010: Great Basin Evolution and Metallogeny, Reno, Nevada, 2010, 17-29.
Moritz, R., Ghazban, F. and Singe, B.S., 2006. Eocene Gold Ore Formation at Muteh, Sanandaj-Sirjan Tectonic Zone, Western Iran: A Result of Late-Stage Extension and Exhumation of Metamorphic Basement Rocks within the Zagros Orogen. Economic Geology, 10, 8, 1497-1524.
Muntean, J.L., 2018. The Carlin gold system: Applications to exploration in Nevada and elsewhere: in Muntean, J.L. (ed.), Diversity of Carlin-Style Gold Deposits, Society of Economic Geologists Reviews in Economic Geology, 19, 39-88.
Muntean, J.L. and Cline, J., 2018. Introduction: Diversity of Carlin-Style Gold Deposits: in Muntean, J.L. (ed.), Diversity of Carlin-Style Gold Deposits, Society of Economic Geologists Reviews in Economic Geology, 19, 1-5.
Palmer, J.C. and Kuiper, Y.D., 2017. Structural geology of the eastern Nadaleen trend, Yukon Territory, Canada: Implications for recently discovered sedimentary rock-hosted gold. Ore Geology Reviews, 80, 48-60.
Pinet, N., Sack, P.J., Mercier-Langevin, P., Lavoie, D., Dubé, B., Lane, J. and Brake, V., 2018. Breccia styles and controls on carbonate replacement-type (‘Carlin-type’) gold zones, Rackla belt, east-central Yukon: in Targeted Geosciences Initiative – 2017 Report of Activities: Volume 1, (ed.) N. Rogers; Geological Survey of Canada, 136-168.
Radtke, A.S., 1985. Geology of the Carlin gold deposit, Nevada. U.S. Geological Survey Professional Paper, 124.
Rhys, D., Valli, F., Burgess, R., Heit, T.D., Griesel, G. and Hart, K., 2015. Controls of fault and fold geometry on the distribution of gold mineralization on the Carlin Trend: in Pennell, W.M. and Garside, L.J., eds., New concepts and discoveries. Geological Society of Nevada 2015 Symposium, 333-389.
Teal, L. and Jackson, M., 2002. Geologic overview of the Carlin Trend gold deposits; in Gold deposits of the Carlin Trend, Nevada. Bureau of Mines and Geology, Bulletin, 111, 9-19.
Vaughan, J., Hickey, K.A. and Barker S., 2016. Isotopic, Chemical, and Textural Evidence for Pervasive Calcite Dissolution and Precipitation Accompanying Hydrothermal Fluid Flow in Low-Temperature, Carbonate-Hosted, Gold Systems. Economic Geology, 5, 111, 1127-1157.
Wang, K.R., Zhou, Y.Q., Sun, L.G. and Ren, C.G., 1994. Study on the gold occurrence from several typical Carlin-type gold deposits in China. Publishing House of University of Science and Technology of China, Hefei, 112
Wang, K.R., Zhou, Y.Q., Li, F., Sun, L., Wang, J., Ren, C.G., Zhou, S.J., Tang, J.Y. and Yang, F.J., 1992. SPM and SEM study on the occurrence of micrograined gold in the Jinya gold deposit, Guangxi. Chinese Science Bulletin, 37, 1906-1910.
Wells, J.D. and Mullens, T.E., 1973. Gold-bearing arsenian pyrite determined by microprobe analysis, Cortez and Carlin gold mines, Nevada. Economic Geology, 68, 187-201.
Whitney D.L. and Evans B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185-187.
Yigit, O., Nelson, E.P., Hitzman, M. and Hofstra, A.H., 2003. Structural Controls on Carlin-Type Gold Mineralization in the Gold Bar District, Eureka County, Nevada. Economic Geology, 6, 98, 1173-1188.