Introduction of stratiform-stratabound tungsten (copper-tin-zinc) mineral occurrences in Bovaki and Aghbolagh areas, northwest of Azna

Abstract

Bovaki and Aghbolagh tungsten (copper-tin-zinc) ore occurrences are located 12 and 14 km northwest of Azna respectively. The region is located in Sanandaj-Sirjan structural zone of Iran, at the complex deformation sub-zone. There are alternative comsisty Upper Triassic carbonate, quartzite and meta-volcanic rocks (such as meta-tuff). In this area, tungsten-copper mineralization occurs as stratiform-stratabound in metamorphosed cherty, sandy, dolomitic limestone country rocks. In this sequence, the volumetric ratio of sedimentary rocks is more than that of volcanic rocks. Mineral paragenesis in the both areas consists of pyrite, scheelite, maghemite, lepidocrocite, Fe-oxide and hydroxide and occasionally chalcopyrite, chalcocite and malachite. Mineralization types are primary, diagenetic and stratabound veinlet. Ore textures are disseminated, lenticular, replacement and open space filling. Mineralization contaben place by diaganetic processes and regional (low grade facies) metamorphism events. Comparison of Bovaki and Aghbolagh mineralization with both typical proximal and distal mineralizations has shown that they are more similar to the distal mineral deposits. 

Keywords


[1] عبدی، م.، "بررسی لیتوژئوشیمیایی و خاستگاه کانی‌سازی در کانسار تنگستن-مس (قلع) ده‌حسین و نظام‌آباد و مقایسه آن با کانسار بامسر"، جنوب‌غرب شازند اراک، پایان‌نامه کارشناسی‌ارشد، دانشگاه تربیت مدرس، (1386).

[2] عزیزپور مغوان، م.، "ژئوشیمی، کانی‌شناسی و ژنز اثرهای معدنی تنگستن اسکارنی بامسر و رگه‌ای روشت و مقایسه آنها با کانسار تنگستن نظام‌آباد (شازند اراک)"، پایان‌نامه کارشناسی‌ارشد، دانشگاه تربیت مدرس، (1378).

[3] Stocklin J., “Structural history and tectonic of Iran, a review”, American Association of Petroleum Geologists Bulletin (AAPG), Vol 52, No.7, p. 1229-1258, (1968).

[4] Mohajjel M., Fergusson C.L., Sahandi M.R., “Cretaceous-Tertiary convergence and continental collision, Sanandaj-Sirjan zone”, western Iran. J. Asian Earth Sci. 21(2003) 397-412.

[5] رادفر ج.، "بررسی‌های زمین‌شناسی و پترولوژی سنگ‌های گرانیتوئیدی ناحیه آستانه و گوشه (در محدوده ورقه 1:100000 شازند)"، پایان‌نامه کارشناسی ‌ارشد، دانشگاه تهران، (1366).

[6] سهندی م.، حسینی‌دوست س. ج.، رادفر ج.، محجل م.، "نقشه زمین‌شناسی 1:100000 شازند و گزارش آن"، سازمان زمین‌شناسی و اکتشافات معدنی کشور، (1385).

[7] Ferrill D.A., Morris A.P., Evans M.A., Burkhard M., Groshong R.H., Onassch C.M., “Calcite twin morphology: a low-temperature deformation geothermometre”. J. Stru. Geol., 26:1521-1529, (2004).

[8] Cheilletz A., “Stratiform tungsten deposits: a review. Geologie en Mijnbouw”, 67: 293-311, (1988).

[9] Petre J.M., Scot S.D., “Windy Craggy northwestern British Columbia. The world’s largest Besshi-type deposits”, In C.T. Barrie & M.D. Hannington (eds.), Volcanic-associated massive sulfide deposits: processes and examples in modern and ancient settings. Society of Economic Geologists, Rev. Econ. Geol., 8: 291-298, (1999).

[10] Slack J.F., Offieltd T.W., Woodruf L.G., Shanks W.C., “Geology and geochemistry of Besshi-type massive sulfide deposits”, Economic Geologists Guidebook Series, (2001).

[11] Raith J.G., “Stratabound tungsten mineralization in regional metamorphic Calc-Silicate rocks from the Austroalpine Crystalline Complex, Austria”, Min. Dep., 26: 72-80, (1991).

[12] Raith J.G., Prochaske W., “Tungsten deposits in the wolfram schist Namaqualand”, South Africa: startabound versus granite-related genetic concepts. Econ. Geol., 90: 1934-1954, (1995).

[13] Maucher A., “The strata-stibnite-bound cinnabar–scheelite deposits”, in Wolf, K.H., (ed), Handbook of strata-bound and stratiform ore deposits, Elsevier 7: 247-256, (1976).

[14] Holl R., “Die scheelit-lagerstatte Felbetal und der vergleich mit anderen scheelitvorkommen in den Ostalpen: Bayrischen Akademie der Wissenschaften Abhandlungen, Mathemathisch-Naturwissenschaftliche Klasse”, 157A: 1-114, (1975).

[15] Holl R., “The strata-bound ore deposits in the eastern Alps. in K.H. Wolf (ed.), Handbook of strata-bound and stratiform ore deposits. Elsevier”, Amsterdam, 5: 1-36, (1976).

[16] Plimer I.R., “Proximal and distal startabound ore deposits”, Min. Dep., 13: 345-353, (1978).

[17] Plimer I.R., “The association of tourmalinite with stratiform scheelite deposits”, Min. Dep., 22: 282-291, (1987).

[18] Plimer I.R., “Stratabound scheelite in meta-evaporites”, Broken Hill, Australia. Econ. Geol., 89: 423-437, (1994).

[19] Kwak T.A.P., “W-Sn Skarn deposits and related metamorphic skarns and granitoids”, Elsevier, 451 p, (1987).

[20] Barnes R. G., “Sratiform and stratabound tungsten mineralization in the Broken Hill Block”, N.S.W., J. Geol. Soc. Austr., 30: 225-239, (1983).

[21] Beran A., God R., Gotzinger M., Zemann J.A., “Scheelite mineralization in calc-silicate rocks of the Moldanubicum (Bohemian Massif) in Austria, Min.”, Dep. 20:16-22, (1985).

[22] Cheilletz A., Giuliani G., “Epigenesis versus syngenesis: a contribution to the debate based on the stratiform tungsten skarn mineralization of Djebel Aouam”, central Morocco. Seventh Quadrennial IAGOD Symposium, D-7000 Stuttgart, (1988).

[23] بهنیا پ.، باباخانی ع.ر.، "وضعیت اکتشافی ذخایر قلع و تنگستن در ایران و نگرشی به معادن آن در جهان"، سازمان زمین‌شناسی و اکتشافات معدنی کشور، (1380).