Petrography and chemical composition of dolomites in the Khan Sormeh Pb-Zn deposit (western Isfahan) and relationship with sulfide mineralization

Author

Abstract

The Khan Sormeh deposit is located at western Isfahan, within the Lower Cretaceous carbonate rocks (K3 unit) which belongs to Malayer-Esfahan Metallogenic Province (MEMP). Galena, sphalerite and pyrite occurs as the main sulfide minerals in the study area and mostly were distinguished with dolomitization, sulfidation and silicic alterations. Based on petrographic evidence, at least four types of dolomite are recognized at carbonate host rocks, including: grey fine-grain dolomite (Rd1), brown-red medium-grain dolomite (Rd2), coarse-grain saddle dolomite (Sd) and vein and veinlet late dolomite (Vd). The CaCO3 and MgCO3 content of dolomites are varies between 58.5 to 61.3 wt% and 37.6 to 40.2 wt%, respectively. The highest and lowest molar ratio of Ca/Mg are distinguished in fine-grain dolomite (AV. 1.65) and vein-type dolomite (AV. 1.1), respectively. Also, total REE content (∑REE) of dolomite are varies between 5.8 to 13.9 ppm, which this variation have high content in fine-grain and saddle dolomites relative to medium-grain and vein-type dolomites. REE distribution in various dolomites is shown the fine-grain dolomite is very similar pattern to Lower Cretaceous host rock. Moreover, LREE enrichment (especially La) of the saddle and vein-type dolomites shows this dolomites occurs in high water rock ratio and its belong to sulfide mineralization in the Khan Sormeh deposit.

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افضلی، س (1384) مطالعه کانی­شناسی، ژئوشیمی، آلتراسیون و ژنز احتمالی کانسار خان­سرمه (نجف آباد اصفهان) از دیدگاه زمین­شناسی اقتصادی. پایان­نامه کارشناسی­ارشد، دانشگاه تبریز، 183 ص.
جلیلیان، ع. ح (1396) سنگ­نگاری، زمین­شیمی و تاریخچه دیاژنتیکی بخش دولومیتی سفیدار (تریاس بالایی) در منطقه فارس، جنوب ایران. مجله رسوب­شناسی کاربردی، شماره 10. ص 81-96.
حیاتی، س.، معانی­جو، م.، طالع فاضل، ا.، محسنی، ح (1394) بررسی ارتباط دولومیت‌زایی و کانه‌زایی در کانسار اپی‌ژنتیک آهنگران (جنوب­شرق ملایر): شواهد کانی‌شناسی، بافت و ساخت و شیمی کانی‌ها. مجله رسوب­شناسی کاربردی، شماره 7. ص 1-17.
ناکینی، ع (1392) تحلیل ساختاری مناطق ایرانکوه و تیران (جنوب و غرب اصفهان)، پایان­نامه کارشناسی­ارشد دانشگاه تربیت مدرس، 180 ص.
Akcay, M., Ozkan, H. M., Spiro, B., Wilson, R., and Hoskin, P. O (2003) Geochemistry of a high-T hydrothermal dolostone from the Emirli (Odemis, western Turkey) Sb–Au deposit. Miner Mag, 67: 671–688.
Banner, J. L, Hanson. G. N. and Meyers, K. J (1988) Fluid rock interaction history of regionally extensive dolomites of the Burlington-Keokuk Formation (Mississippian): isotope evidence. In: sedimentology und geochemistry of dolostones (Ed. V. Shukla & P.A. Baker), Spec. Publ. Soc. econ. Palront Miner, 43: 97-113.
Burnol, L (1968) Contribution al'etude des gisments de plomb et zinc de L'Iran. Essais de classification paragenetique. Geological Survey of Iran Report No. 11. 113 p.
Conliffe, J. Azmy, K. Gleeson, S. A. and Lavoie, D (2010) Fluids associated with hydrothermal dolomitization in St. George Group, western Newfoundland, Canada. Geofluids, 10: 422–437.
Davies, G. R. and Smith, L. B (2006) Structurally controlled hydrothermal dolomite reservoir: an overview. American Association of Petroleum Geologists Bulletin, 90: 1641-1690.
Dorobek, K. L. and Filby. R. H (1988) Origin of dolomites in a downslope biostrome, Jefferson Formation (Devonian), central Idaho: evidence from REE patterns, stable isotopes, and petrography. Bull. Can. Petrol. Geol, 36: 202-215.
Dravis, J. J. and Muir, I. D (1992) Case study of burial dissolution in dolomites. Devonian Elk Point Group, western Canada, in I. E. Hutcheon, J. Reimer, M. Teare, J. J. Dravis, and N. C. Wardlaw, eds., Subsurface dissolution porosity in carbonates. Recognition, causes and implications: Canadian Society of Petroleum Geologists Short Course Notes, 1992 Canadian Society of Petroleum Geologists–American Association of Petroleum Geologists Convention, Calgary, Section 5, 117 p. and figures.
Dunsmore, H.  E (1973) Diagenetic processes of lead-zinc emplacement in carbonates: Institute Mining and Metallurgy Transactions, Section B, 82: B168–B173.
Garven, G (1985) The role of regional fluid flow in the genesis of the Pine Point deposits, Western Canada sedimentary basin. Econ. Geol, 80: 307-324.
Hagni, R. D (2018) Platy Galena from the Viburnum Trend, Southeast Missouri: Character, Mine Distribution, Paragenetic Position, Trace Element Content, Nature of Twinning, and Conditions of Formation. Minerals, 93: 137-156.
Huang, S. J., Qing, H., Pei, C. R., Hu, Z. W., Wu, S. J., and Sun, Z. L (2006) Strontium concentration isotope composition and dolomitization fluids in the Feixianguan Formation of Triassic, Eastern Sichuan of China. Acta Petrologica Sinica, 22: 2123–2132 (in Chinese with English abstract).
Hubner, H. and Malakpour, A (1970) Report on the Khaneh-Sormeh mine. Geological survey of Iran. Dept. of mineral resources. Internal Report, 5p.
Jia, L., Cai, C., Yang, H., Li, H., Wang, T., Zhang, B., Jiang, L., Tao, X (2015) Thermochemical and bacterial sulfate reduction in the Cambrian and Lower Ordovician carbonates in the Tazhong Area, Tarim Basin, NW China: evidence from fluid inclusions, C, S, and Sr isotopic data. Geofluids. 15: 421–437.
Lapponi, F. Bechstädt, T. Boni, M. Banks, D. A. Schneider, J (2013) Hydrothermal dolomitization in a complex geodynamic setting (lower Paleozoic), northern Spain. Sediment, 61: 441–443.
Leach, D. L, Sangster, D. F. Kelley, K. D. Large, R. R. Garven, G. Allen, C.R. Gutzmer, J. and Walters S (2005) Sediment-hosted lead-zinc deposits: A global perspective. Econ Geol, 100: 561−608.
Leavitt, W. D. Halevy, I. Bradley, A. S. Johnston, D. T (2013) Influence of sulfate reduction rates on the Phanerozoic sulfur isotope record. Proc Natl Acad Sci, 110: 11244–11249.
Li, M., Song, H., Algeo, T. J., Wignall, P. B., Xu Dai, X., Woods, A. D (2018) A dolomitization event at the oceanic chemocline during the Permian-Triassic transition: Geol, 46: 1043–1046.
Magnall, J. M. Gleeson, S. A. Stern, R. A. Newton, R. J. Poulton, S. W. and Paradis, S (2016) Open system sulphate reduction in a diagenetic environment-isotopic analysis of barite (δ34S and δ18O) and pyrite (δ34S) from the Tom and Jason Late Devonian Zn-Pb-Ba deposits, Selwyn Basin, Canada. Geochim Cosmochim Acta, 180: 146–163
Machel, H. G (2001) Bacterial and thermochemical sulfate reduction in diagenetic settings-old and new insights. Sediment Geol, 140: 143–175.
McLennan, S. M (1989) Rare earth elements in sedimentary rocks: influence of provenance and sedimentary processes. In: Geochemistry and Mineralogy of Rare Earth Elements, Ed. by B.R. Lipin & G.A. McKayj, Miner. SOC. Am. Short Course, 21: 169-200.
Momenzadeh, M (1976) Stratabound lead zinc ores in the lower Cretaceous and Jurassic sediments in the Malayer–Esfahan District (West Central Iran): Lithology, metal content, zonation and Genesis. PhD Thesis, University of Heidelberg, 300 pp.
Moore, P. F (1988) Devonian geohistory of the Western Interior of Canada. In: Devonian of the World, Proceedings of the Second International Symposium on the Devonian System, Vol. 1 (Ed. by N.J. McMillan, A.F. Embry & D.J. Glass), pp. 67-83. Canadian Soc. Petrol. Geol., Calgary, Alberta.
Ohmoto, H. Goldhaber, M. B (1997) Sulfur and carbon isotopes. In: Geochemistry of hydrothermal ore deposits, Ed. by Barnes HL, 3rd edn. Wiley, New York, pp 517–611.
Palmer, M. R (1985) Rare earth elements in foraminifera tests. Earth planet. Sci. Lett, 73: 285-298.
Parekh, P. P. Moller, P. Dulski, P. and Bauschw, M (1977) Distribution of trace elements between carbonate and noncarbonate phases of limestone. Earth planet. Sci. Lett, 34: 39-50.
Peace, W. M. and Wallace, M. W (2000) Timing of mineralization at the Navan Zn-Pb deposit: a post-Arundian age for Irish mineralization. Geol, 28: 711–714.
Pearce, M. A., Timms, N. E., Hough, R. M., Cleverley, J. S (2013) Reaction mechanism for the replacement of calcite by dolomite and siderite: implications for geochemistry, microstructure and porosity evolution during hydrothermal mineralization. Contr. Miner. Petrol, 166: 995–1009.
Qing, H. and Mountjoy, E. W (1994) Formation of coarsely crystalline, hydrothermal dolomite reservoirs in the Presqu’ile barrier, Western Canada Sedimentary Basin. Bull. Am. Ass. Petrol. Geol, 78: 55-77.
Qing, H. and Mountjoy, E. W (1988) Multistage dolomitization in rainbow buildups, Middle Devonian Keg River Formation, Alberta, Canada. J Sed Res, 59: 114–126.
Rao, C. P (1996) Elemental composition of marine calcite from modern temperate shelf brachiopods, bryozoans and bulk carbonates, eastern Tasmania, Australia. Carbonates and Evaporates, 11: 1–18.
Rizzi, G. and Braithwaite, C. J. R (1997) Sedimentary cycles and selective dolomitization in limestones hosting the giant Navan zinc-lead ore deposit, Ireland. Explor Min Geol, 6: 63–77.
Robinson, M., Godwin, C. I (1995) Genesis of the Blende Carbonate-Hosted Zn-Pb-Ag Deposit, North-Central Yukon Territory: Geologic, Fluid Inclusion and Isotopic Constraints. Econ Geol, 90: 369-384.
Schwinn, G. and Markl G (2005) REE systematics in hydrothermal fluorite. Chemical Geology, 216: 225–248.
Sibley, D. F. and Gregg, J. M (1987) Classification of dolomite rock texture. J Sed Res, 57: 967–975.
Song, Y., Yang, T., Zhang, H., Liu, Y., Hao, H., Li, Z (2015) The Chaqupacha Mississippi Valley-type Pb–Zn deposit, central Tibet: Ore formation in a fold and thrust belt of the India–Asia continental collision zone. Ore. Geol. Rev, 70: 533–545.
Veizer, J (1983) Chemical diagenesis of carbonates: theory and application of trace element technique". In: Stable Isotopes in Sedimentary Geology, Ed. by Arthur, M.A., Anderson, T.F., Kaplan, I.R., Veizer, J., Land, L.S. Soc. Econ. Paleont. Mineral. Short Course, 10: 3–100.
Warren J (2000) Dolomite: occurrence, evolution and economically important associations. Earth-Sci. Rev, 52: 1–81.
Wilkinson, J. J (2003) On diagenesis, dolomitisation and mineralization in the Irish Zn-Pb orefield. Miner Deposita, 38: 968–983.
Wilkinson, J. J, Boyce, A. J, Everett, C. E, and Lee, M. J (2003) Timing and depth of mineralization in the Irish Zn-Pb orefield. In: Europe’s Major Base Metal Deposits, Ed. by Kelly JG, Andrew CJ, and Ashton JH, et al., pp. 483–497. Dublin: Irish Association for Economic Geology.
Wilkinson, J. J. and Lee, M. J (2003) Cementation, hydrothermal alteration, and Zn-Pb mineralization of carbonate breccias in the Irish Midlands: textural evidence from the Cooleen zone, near Silvermines, County Tipperary—a reply. Econ Geol, 98: 194–198.
Wright, W. R. Johnson, A. W. Shelton, K. L. Somerville, I. D. and Gregg, J. M (2000) Fluid migration and rock interactions during dolomitisation of the Dinantian Irish Midlands and Dublin Basin. J Geochem Explor, 69: 159–164.
Zahedi, M (1978) Geological Map of Esfahan, scale 1:250,000. Geological Survey of Iran.
Zahedi, M (1975) Geological Map of Esfahan, scale 1:100,000. Geological Survey of Iran.
Zhang, J., Hu, W., Qian, Y., Wang, X., Cao, J., Zhu, J., Li., Q., Xie, X (2009) Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow. Marine and Petrol Geol, 26: 1428–1440.
Zhu, D. Y. Jin, Z. J. WX, H (2010) Hydrothermal recrystallization of the lower Ordovician dolomite and its significance to reservoir in northern Tarim Basin. Sci China Earth Sci, 40:156–170.
Zou, H., Fang, Y., Zhang, S. H., Zhang, Q (2016) The source of Fengjia and Langxi barite–fluorite deposits in southeastern Sichuan, China: evidence from rare earth elements and S, Sr, and Sm–Nd isotopic data. Geol, 52: 470-488.