Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Ore facies, fluid inclusions, and genesis of Milakuh -Touyeh F(Zn-Pb-Ba) deposit, Lower Cambrian carbonate-hosted (Soltanieh Formation) in Central Alborz, Southwest Damghan, Iran

Document Type : Original Research Paper

Authors
Ebrahim Rastad 1
Ghodratollah Rostami Paydar 1
Sadat Feiznia 2
Majid Ghaderi 3
1 * Department of Economic Geology, Tarbiat Modarres University, Tehran, Iran
2 Natural Sciences Faulty, Tehran University, Iran
3 Department of Economic Geology, Tarbiat Modarres University, Tehran, Iran
Abstract
Milakuh-Touyeh the F-Zn-Pb-Ba deposit is located 45 km SW of Damghan. The country rocks of the deposit are dolostones of the upper part of Soltanieh Formation. The orebodies in the dolostones are located in certain ore-bearing facies as four ore horizons. The ore facies from bottom to top of the sequence are as follows: Dolosparite-sparstone is the facies of ore horizon I, in which Zn (Pb-F-Cu-Ba) mineral are the main paragenesis. Zinc is the major constituent of the horizon (economic ore horizon). Dolomicrosparite-dolosparite is the main facies in the ore horizons II and III, with F-Pb (Ba-Cu) paragenesis. Fluorite in horizon II is economic and mineable. Presence of altered tuff breccia facies with fluorite is the characteristic of the horizon III. Laminated dolosparite, dark gray chert and ferrigenous dolomicrite are the facies of horizon IV. The main paragenesis here is F-Pb. The increase in silica content is an important characteristic of this horizon. Depositional environment of ore-bearing and other facies in the upper part of Soltanieh Formation in the Milakuh-Touyeh area is tidal flat. The ore geometry, textures, structures and paragenetic sequence, indicate that the ore minerals are formed and concentrated in four stages:
1-Deposition; 2- Early diagenesis; 3- Late diagenesis; 4- Uplift and exposure. Final stage of ore formation comes from remobilization of sedimentary-diagenetic generations and their epigenetic deposition in the open spaces, faults and fractures together with weathering and supergene enrichment. The majority of mining activities in the area have been concentrated on the late diagenetic and epigenetic types. Fluid inclusion studies on diagenetic types of fluorites indicate relatively high Th (211 ± 5 °C) and salinities (23.45 ± 5 wt% NaCl equivalent). The Th values for the epigenetic fluorite (fault species) are lower than those of diagenetic ones (134 ± 5 °C). Geometry of ore bodies, occurrence of ore horizons in certain sedimentary facies, ore texture and structures, depositional environment (tidal flat), paragenetic sequence of minerals and fluid inclusion data, all suggest that Milakuh-Touyeh F-Zn-Pb-Ba deposit is an F-rich MVf deposit.
Keywords
Fluorite (zinc-lead) deposit
Milakuh-Touyeh
Damghan
Soltanieh Formation
ore facies
fluid inclusion
tidal flat
syngenetic to epigenetic
F-rich MVT

Subjects

Bazargani-Guilani, K., 1982- Die mittelpermischen schichtgebundenen Blei-Zink-Schwerspart-Lagerstatten des Kalwanga distriktes, Zentral Alborz, Iran (mit besonderer Berucksichtigun des Duna-Grubenfeldes), Ruprecht-karl-Universitat, Heidelberg Univ.
Fontbote, L., 1981- Strata-bound Zn-Pb-F-Ba deposits in carbonate rocks: new aspects of paleogeographic location, facies factors and diagenetic evolution, PhD thesis, Heidelberg Univ.
Fontbote, L., 1990- Genesis of the Mississippi Valley Type Zn-Pb deposits of San Vicente, Central Peru, Econ. Geol., v. 85, p. 1402-1437.
Ghazban, F., Mc Nutt, RH., and Schwatrz, H.p., 1994- Genesis of sediment-hosted Zn-Pb-Ba deposits in the Irankuh district, Esfahan area, West-Central Iran, Econ. Geol., v. 89, p. 1262-1278.
Goldstein, RH., 2001- Fluid inclusions in sedimentary and diagenetic systems, Lithos, v. 55, p. 159-192.
Hanor, J.S., 1984 - Variation in the chemical composition of oil-field brines with depth of Northern Louisiana and Southern Arkansas; Implication for mechanisms and rates of mass transport and diagenetic reactions. Trans., Gulf Coast Assoc. Geol. Soc., v. 34, p. 55-61.
Jackson, S.A., and Beals, F.W., 1967- An aspect of sedimentary basin evolution, the concentration of MVT ores during late stage diagenesis, Bull. of Can. Petrol. Geol., v. 15, p. 383-433.
Langdan, S.G., 1992-Regional porosity evaluation of the Catoch dolomite, St. George Group, p. 2-20.
Leach, D.L., 1999- Mississippi Valley-Type Lead-Zinc deposits through geologic time: Implications for the exploration of undiscovered deposits, U.S.G.S. Mineral Resource Program, p. 211-237.
Leach, D.L., and Sangster, D.F., 1993- Mississippi Valley-Type lead-zinc deposits, in Kirkham et al., Mineral Deposit Modelling, Geological Association of Canada special paper 40, p. 289-314.
Liu, W., Boni, M., and Bechstadt, T., 1997- A first approach to the MVT ore deposits in the Cambrian of Hunan (southern China), SGA Meeting, TURKU 1997.
Momenzadeh, M., 1976- Strata bound lead-zinc ores in the Lower Cretaceous and Jurassic sediments in the Malayer-Esfahan district (west Central Iran). Lithology, Metal content, Zonation and Genesis: Ruprecht-Karl University, Heidelberg.
Quing, H., and Mount Joy, E.W., 1994- Origin of dissolution vugs, caverns and breccias in the Middle Devonian Presquile Barrier, host of Pine Point Mississippi Valley type deposits, Econ. Geol., v. 89, p. 858-876.
Rastad, E., Fontbote, L., and Amstutz, G.C., 1980- Relation between tidal flat facies and diagenetic ore fabrics in the stratabound Pb-Zn-(Ba-Cu) deposits of Iran-kuh, Esfahan, west central Iran.
Roedder, E., 1976- Fluid inclusion evidence on the genesis of ores in sedimentary and volcanic rocks. In: Wolf, K.H.  Handbook of strata-bound and stratiform ore deposits (Ed), vol. 2, Geochemical studies: Amsterdam, Elsevier, New York, Ch. 4, p. 67-110.
Roedder, E., 1984 - Fluid inclusions, Reviews in Mineralogy, vol. 12, Mineralogical Society of America, 644 p.
Roedder, E., and Bodnar, R.J., 1997- Fluid inclusion studies of hydrothermal ore deposits. In: Barnes, H.L., (Ed.).  Geochemistry of hydrothermal ore deposits, Wiley, New York, p. 657-697.
Sangster, D.F., 1990- Mississippi Valley-type and SEDEX lead-zinc deposits: A comparative examination, Institution of Mining and Metallurgy, section B: Applied earth science, v. 99, p. 21-42.
Shepherd, T.J., Ranbin, A.H., and Alderton, D.H.M., 1985- A practical guide to fluid inclusion studies, Blackie, Glasgow, 223p.
Spirakis, G.S., and Hyle, V., 1995- Evaluation of precipitation mechanism for Mississippi Valley type deposit, Ore Geol. Rev. V. 10, p. 1-17.
Symons, D.T.A., Lewchuk, M.T., and Sangster, D.F., 1998- Laramid orogenic fluid flow into the Western Canada sedimentary basin: Evidence from paleomagnetic dating of Kicking Horse Mississippi valley-type ore deposit: Econ. Geol., V. 93, p. 68-83.
Van den Kerkhof, AM., and Hein, U.F., 2001- Fluid inclusion petrography, Lithos, v. 55, p. 27-4 7.
Viets, J.G., Hofstra, A.F., and Emsbo, P., 1996- Solute compositions of fluid inclusions in sphalerite from North American and European Mississippi Valley-Type ore deposits: ore fluid derived from evaporated seawater, in Sangster, D.F., (ed.), Carbonate-hosted lead-zinc deposits: Society of Economic Geologists, Special Publication, no. 4, p. 465-482.
Wilkinson, J.J., 2001- Fluid inclusions in hydrothermal ore deposits, Lithos, v. 55, p. 229-272.
Wilkinson, J.J., Everett, C.E., Eyre, S.L., and Boyce, A.J., 1998- Fluid flow and mineralization in the Irish ore field. Programme with Abstracts, Mineral Deposits Studies Group AGM, Univ. of St. Andrews, Scotland.
Zee, S., 1995- Complex replacement of saddle dolomite by fluorite within zebra dolomites, an example from Radning, Carinthia, Austria.
Scientific Quarterly Journal of Geosciences
Volume 12, 45-46
Autumn & Winter 2003, Vol. 12, No. 45-46
Winter 2002
Pages 2-21