Trace elements geochemistry of galena in fluorite deposits from central Alborz, Mazandaran Province

Document Type : Research Article

Authors

• Mahtab Hamzeh
• Behnam Shafiei Bafti
• Hadi Omrani

Golestan University

10.22067/econg.v12i2.77113

Abstract

Introduction                                        
Trace elements including As, Sb, Bi, Ga, Ge, In, Hg, Cd, Tl, Se and REEs have special applications in various industries due to their physical and chemical properties. Ore deposits of these metals have not occurred in the Earth's crust, and these elements are mainly hosted in sulfide minerals of Cu, Pb and Zn (Hall and Heyl, 1968; Song and Tan, 1996; Ye et al., 2011; George et al., 2015). Elika Formation (middle Triassic) in central Alborz is host of several carbonate rock-hosted fluorite deposits such as Kamarposht, Pachi-Miana, Shashroodbar and Era (Alirezaee, 1989; Rastad and Shariatmadar, 2001; Rajabi et al., 2013; Vahabzadeh et al., 2014; Zabihitabar and Shafiei, 2014; Mehraban et al. 2016; Nabiloo et al. 2017). Despite previous valuable studies in these deposits, the value of the presence of trace elements in the galena of these deposits has not yet been documented.
 
Materials and methods
For the current research study, sampling from 3 flourite mines including Kamarposht, Pachi-Miana and Era was carried out to collect 26 pure galena grains separated from various fluorite ore-types. The samples were analyzed for trace elements at the ICP-MS at Act Labs Ltd., Canada.
 
Results
The highest concentrations of trace elements in galena samples were obtained for Sb (with mean 692 ppm and maximum concentration of 2531 ppm) and Ag (with a mean of 24.28 ppm and a maximum concentration of 2531 ppm). The lowest values ​​were obtained for Bi (mean 0.04 ppm), Se (average 1.89 ppm) and Ga (mean 0.9 ppm) and Tl (mean 0.3 ppm). Hg (0.06 – 10 ppm), Cd (1.14 – 23 ppm) and As (0.1 – 36 ppm) exhibited a wide range of concentrations.
The comparison of the trace elements concentration in the studied galena samples with those of the MVT, SEDEX, Irish-type deposits shows that the concentrations of Sb, Tl, Hg, Se and Cu in the studied galena are close to the values ​​for MVT deposits, whereas the studied galena samples are much poorer in Ag, Bi, Cd and As than those of the MVT deposits. There is meaningful relationship between concentrations of some trace elements such as Tl– Ag (r=0.82), Tl– Cu (r=0.71), Ag–Sb (r=0.66), Cu– Ag, Ag –  As, Cu– As, Sb–  Cu, Hg – Zn, As – Sb, Hg –  Cd, Zn – Cu (0.3 < r < 0.6).
 
Discussion
Our data revealed that galena samples are relatively rich in Sb (up to 2581 ppm with an average ~ 620 ppm) and Ag (up to 70 ppm with an average ~ 30 ppm), whereas they are poor in other trace elements. Inter-element relationships in galena show strong correlation between Sb – Ag (r≥0.65) and moderate correlation between Ag – As, Ag –Cu as well as Hg –Zn (0.4<r<0.6). Based on our data, high concentration of Sb and Ag in galena could be related to the presence of special minerals (e.g., tetrahedrite, stephanite, diaphorite, twinnite) as inclusion in the host galena, whereas the occurrence of not very high concentrations of Cd and Hg and meaningful relationship with Zn concentrations in galena could be due to the presence of inclusions of sphalerite (ZnS) and polhemusite (ZnHgS) in the galena. Due to the large presence of galena (several tens of thousands) in the studied fluorite mines, and the relatively high concentration of Sb and Ag in the galena samples of these deposits, an assessment of the economic recovery on a laboratory scale of these elements is suggested.
 
References
Alirezaee, S., 1989. Contribution to stratigraphy and mode of generation of F-Pb-Ba deposits in Triassic of eastern Alborz. M.Sc. Thesis, Tehran University, Tehran, Iran, 87 pp. (in Persian with English abstract)
George, L., Cook, N.J., Ciobanu, K.L. and Wade, B.P., 2015. Trace and minor elements in galena: A reconnaissance LA-ICP-MS study. American Mineralogist, 100(3): 548–569.
Hall, W.E. and Heyl, A., 1968. Distribution of minor elements in ore and host rock, Illinois-Kentucky fluorite district and upper Mississippi Valley Zinc-Lead district. Economic Geology, 63(4): 655–670.
Mehraban, Z., Shafiei, B. and Shamanian, G.H., 2016. REEs geochemistry in fluorite deposits of Elika Formation (East of Mazandaran Province). Journal of Economic Geology, 8(1): 201–221. (in Persian with English abstract)
Nabiloo, F., Shafiei, B. and Amini, A. 2017. Diagenetic and post-diagenetic fabrics in Kamarposht fluorite mine (east of Mazandaran province): Explaining and genetic interpretation. Journal of Economic Geology, 9(2): 483 – 507. (in Persian with English abstract)
Rajabi, A., Rastad, E. and Cannet, C., 2013. Metallogeny of Permian-Triassic carbonate hosted Zn-Pb and F deposits of Iran: A review for future mineral exploration. Australian Journal of Earth Sciences, 60(2): 197–216.
Rastad, E. and Shariatmadar, A., 2001. Sheshroodbar fluorite deposits, sedimentary and diagenetic fabrics and its depositional environment (Savad Kuh, Mazandaran province). Scientific Quarterly Journal, GEOSCIENCES, 10(41–42): 20–38. (in Persian with English abstract)
Song, X. and Tan, H., 1996. Geochemical characteristics of the Fankou Pb-Zn deposits, Northern Guangdong, South China. In: D.F. Sangster (Editor), Carbonate-hosted Lead-Zinc deposits. Special Publication No. 4, Society of Economic Geology, USA, pp. 350–355.
Vahabzadeh, G., Khakzad, A., Rasa, I.­ and Mosavi, M.R., 2014. Fluorite REEs geochemistry in fluorite deposits of central Alborz. New Findings in Applied Geology, 16(1): 58–70. (in Persian with English abstract)
Ye, L., Cook, N.J., Ciobanu, C.L., Liu, Y.P., Zhang, Q., Liu, T.G., Gao, W., Yang, Y.L. and Danyushevskiy, L., 2011. Trace and minor elements in sphalerite from base metal deposits in South China: a LA-ICP-MS study. Ore Geology Reviews, 39(2): 188–217.
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Keywords

• Trace elements
• Galena
• Fluorite
• Mazandaran

20.1001.1.20087306.1399.12.2.5.4

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