Geology, mineralogy, structure and texture, geochemistry and genesis of the Golestan Abad iron oxide- apatite deposit (East of Zanjan)

Document Type : Research Article

Authors

• Shiva Kordian ¹
• Mir Ali Asghar Mokhtari ¹
• Hossein Kouhestani ¹
• Somayeh Veiseh ²

¹ Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran

² Laboratories in Geological Recearch Center of Geologycal Survey of Iran, Karaj, Iran

10.22067/econg.v12i3.79628

Abstract

Introduction
Iron oxide-apatite deposits (IOA) are considered to be Kirune-type iron ores which have been formed during Proterozoic to Tertiary eras in different parts of the world. They usually have a connection with calc-alkaline volcanic rocks (Hitzman, 2000). Apatite occurs as a major constituent of these deposits which is accompanied with magnetite and some actinolite. One of the most important features of these deposits (Frietsch and Perdahl, 1995) is higher concentration of REEs.
There are some iron oxide-apatite deposits in the Tarom-Hashtjin magmatic-metallogenic belt, northwestern Iran. The Golestan Abad iron oxide-apatite deposit is one of the IOA deposits at the Tarom-Hashtjin belt which is located about 30 km east of Zanjan. The Golestan Abad deposit was studied during the exploration studies, but its geological characteristics, mineralogy, texture, geochemistry and genesis have not been studied yet.
 
Materials and methods
This research study can be divided into two parts that include field and laboratory studies. Field studies include recognition of different lithological units and mineralization zones along with sampling for laboratory studies. During field studies, 60 samples were selected for petrographical, mineralogical and analytical studies. Moreover, 12 thin sections and 15 thin-polished sections were used for petrographical and mineralogical studies. For geochemical studies, 6 samples from intrusive host rocks and 7 samples from mineralized zones were analyzed by XRF and ICP-MS methods at the Zarazma laboratory, Tehran.
 
Results
The Golestan Abad area is composed of Eocene volcano-sedimentary rocks of the Karaj Formation which have been intruded by quartz monzodiorite, pyroxene quartz monzodiorite and porphyritic quartz diorite intrusions. Based on petrographic studies, the pyroxene quartz monzodiorites have porphyritic and felsophyric textures and are composed of plagioclase, quartz, clinopyroxene, K-feldspar and hornblende phenocrysts set in a quartz-feldspatic groundmass. Quartz monzodiorites show porphyritic and felsophyric textures and composed of plagioclase, hornblende, quartz, K-feldspar and biotite. The quartz monzodiorite and pyroxene quartz monzodiorites have high-K calc-alkaline affinity and may be classified as metaluminous I-type granitoids. Primitive mantle-normalized (McDonough and Sun, 1995) trace elements diagrams for these granitoids indicate LILE enrichment along with negative HFSE and distinctive positive Pb anomalies. Chondrite-normalized (McDonough and Sun, 1995) REE patterns for these granitoids demonstrate LREE enrichment (high LREE/HREE ratio) and weak negative anomalies in Eu. These granitoids were formed in an active continental margin to post collisional tectonic setting.
Mineralization at the Golestan Abad occurs as lenses and vein-veinlets of iron oxide-apatite mainly within the quartz monzodiorite- pyroxene quartz monzodiorite intrusions. Stockwork ores occur in the footwall of the main veins. Mineralized lenses and veins have up to 300m length and 20m width. Hydrothermal alterations around the mineralized veins include silicification, calcic (actinolitization), argillic and propylitic. From a mineralogical point of view, this deposit is composed of magnetite, apatite, actinolite, pyrite and chalcopyrite as primary minerals, while hematite, covellite, goethite and gypsum were formed during supergene alteration. Mineralization textures in the Golestan Abad deposit include vein-veinlet, banded, massive, brecciated, disseminated, stockwork, replacement, relict and open space filling. Based on mineralogical and textural studies, 3 stages of apatite formation were distinguished which include: 1- coarse-grained idiomorphic apatite crystals within the magnetite matrix, 2- fine-grained apatite crystals as matrix of brecciated magnetites, and 3- coarse-grained idiomorphic apatite crystals within the actinolite-apatite veins which have been cut in the previous stages. Apatite crystals of the 3 mentioned stages have high concentrations of REE that include 0.98, 0.92 and 0.95%, respectively. Condrite-normalized (McDonough and Sun, 1995) REE patterns for 3 apatite generations demonstrate LREE enrichment with high LREE/HREE ratio and distinctive negative Eu anomalies.
 
Discussion
Similar REE patterns of apatite crystals and mineralized samples with host quartz monzodiorite-pyroxene quartz monzodiorite samples demonstrate a genetic link between iron oxide-apatite mineralization and granitoids. Furthermore, REE patterns of the Golestan Abad deposit are similar to other iron oxide-apatite deposits of the Tarom-Hashtjin metallogenic belt (Nabatian and Ghaderi, 2014; Mokhtari et al., 2017), and those of Central Iranian iron ores (Mokhtari et al., 2013). Finally, the REE patterns of the Golestan Abad deposit are similar with the REE patterns of the Kiruna-type iron ores (Frietsch and Perdahle, 1995). Totally, based on mineralogical assemblages, hydrothermal alteration, mineralization textures and geochemical characteristics, the Golestan Abad iron oxide- apatite deposit can be classified as the Kiruna-type iron ores.
 
Acknowledgment
This research was made possible by a grant from the office of vice-chancellor for research and technology, University of Zanjan. We acknowledge their support. The respectable reviewers and editor of the Journal of Economic Geology are also thanked for their constructive comments.
 
References
Frietsch, R. and Perdahl, J.A., 1995. Rare earth elements in apatite and magnetite in Kiruna-type iron ores and some other iron ore types. Ore Geology Reviews, 9(6): 489–510.
Hitzman, M.W., 2000. Iron oxide-Cu-Au deposits: What, where, when and why? In: Porter, T.M., (Editor), Hydrothermal iron oxide copper-gold and related deposits: A global perspective. Vol. 1.  Australian Mineral Foundation, Adelaide, pp. 9–25
Mokhtari, M.A.A., Hossein Zadeh, Gh. and Emami, M.H., 2013. Genesis of iron-apatite ores in Posht-e-Badam Block (Central Iran) using REE geochemistry. Journal of Earth System Science, 122(3): 795–807.
Mokhtari, M.A.A., Sadeghi, M. and Nabatian, Gh., 2017. Geochemistry and potential resource of rare earth element in the IOA deposits of Tarom area, NW Iran. Ore Geology Reveiws, 92: 529–541.
Nabatian, Gh. and Ghaderi, M., 2014. Mineralogy and geochemistry of the rare earth elements in iron oxide-apatite deposits of the Zanjan region. Scientific Quarterly Journal, Geosciences. 24(93): 157–170. (in Persian with English abstract)

Keywords

• Magnetite-apatite mineralization
• Kirouna-type
• Rare earth elements
• Tarom zone
• Golestan Abad
• Zanjan

20.1001.1.20087306.1399.12.3.2.3

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References

Aldanmaz, E., Pearce, J.A., Thirlwall, M.F. and Mitchell, J.G., 2002. Petrogenetic evolution of late Cenozoic, post-collision volcanism in western Anatolia, Turkey. Journal of Volcanology and Geothermal Research, 102(1–2): 67–95.

Amini, B., 1997. Geological Map of Tarom, scale 1:100000. Geological Survey of Iran.

Belousova, E., Griffin, W.L., O'Reilly, S.Y. and Fisher, N.L., 2002. Igneous zircon: trace element composition as an indicator of source rock type. Contributions to Mineralogy and Petrology, 143(5): 602–622.

Besharati, S., Nabatian, Gh. and Sadeghi, A, 2010. Skarn mineralization in the Arjin region (Southwest Soltanieh). The 1^th Conference of the Iranian Economic Geological Society, Ferdowsi University of Mashhad, Mashhad, Iran. (in Persian with English abstract)

Boomeri, M., 2012. Rare earth minerals in Esfordi magnetite-apatite deposit, Bafq district. Scientific Quarterly Journal, Geosciences, 22(85): 71–82.

Chappell, B.W. and White, A.J.R., 1992. I-and S-type granites in the Lachlan Fold Belt. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 83(1–2): 1–26.

Collins, W.J., Beams, S.D., White, A.J.R. and Chappell, B.W., 1982. Nature and origin of A-type granites with particular reference to southeastern Australia. Contributions to Mineralogy and Petrology, 80(2): 189–200.

Dill, H.G., 2010. The chessboard classification schome of mineral deposits: Mineralogy and geology from aluminum to zirconium. Earth-Science Reviews, 100(1–4): 1–420.

Frietsch, R. and Perdahl, J.A., 1995. Rare earth elements in apatite and magnetite in Kiruna-type iron ores and some other iron ore types. Ore Geology Reviews, 9(6): 489–510.

Gleason, J.‌D., Marikos, M.‌A., Barton, M.‌D. and Johnson, D.‌A., 2000. Neodymium isotope study of rare earth element sources and mobility in hydrothermal Fe oxide (Fe-P-REE) system. Geochemical et Cosmochemica Acta, 64(6): 1059–1068.

Hastie, A.R., Ker, A.C., Pearce, J.A. and Mitchell, S.F., 2007. Classification of altered volcanic island arc rocks using immobile trace elements: Development of the Th–Co discrimination diagram. Journal of Petrology, 48(12): 2341–2357.

Hildebrand, R.S., 1986. Kiruna- type deposit: their origin and relationship to inter mediate subvolcanic plutons in the Great Bear magmatic zone, Northwest Canada. Economic Geology, 81(3): 640–659.

Hitzman, M.W., 2000. Iron oxide-Cu-Au deposits: What, where, when and why? In: T.M. Porter (Editor), Hydrothermal iron oxide copper-gold and related deposits: A global perspective. Vol. 1.  Australian Mineral Foundation, Adelaide, pp. 9–25

Hitzman, M.W., Oreskes, N. and Einaudi, M.T., 1992. Geological characteristics and tectonic setting of Protrozoic iron oxide (Cu-U-Au-LREE) deposits. Precambrian Research, 58(1): 241–287.

Hofmann, A.W., 1988. Chemical differentiation of the earth: the relationship between mantle, continental crust, and oceanic crust. Earth and Planetary Science Letters, 90(13): 297–‌314.

Jami, M., Dunlop, A.C. and Cohen, D.R., 2007. Fluid inclusion and stable isotope study of the Esfordi apatite- magnetite deposit, Central Iran. Economy Geology, 102(6): 1111–1128.

Kamber, B.S., Ewart, A., Collerson, K.D., Bruce, M.C. and McDonald, G.D., 2002. Fluid-mobile trace element constraints on the role of slab melting and implications for Archaean crustal growth models. Contributions to Mineralogy and Petrology, 144(1): 38–‌56.

Kerr, I.D., 1998. Mineralogy, Chemistry and hydrothermal evolution of the Pea Ridge Fe-oxide-REE Deposit, Missouri, USA. Unpublished M.Sc. Thesis, University of Windsor, Ontario, Canada, 112 pp.

Kordian, Sh., 2018. Geochemistry of REE in Golestan Abad iron oxide- apatite deposit (east of Zanjan). Unpublished M.Sc. Thesis, University of Zanjan, Zanjan, Iran, 122 pp. (in Persian with English abstract)

Kuster, D. and Harms, U., 1998. Post-collisional potassic granitoids form the southern and northwestern parts of the Late Neoproterozoic East African Orogen: a review. Lithos, 45(1–4): 177–195.

Li, X.H., Li, Z.X., Li, W.X., Liu, Y., Yuan, C., Wei, G. and Qi, C., 2007. U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on age and origin of Jurassic I-and A-type granites from central Guangdong, SE China: a major igneous event in response to foundering of a subducted flat- slab? Lithos, 96(1–2): 186–204.

Loberg, B.E.H. and Horndal, A.K., 1983. Ferride geochemistry of Swidish Precambrian iron ores. Mineralium Deposita, 18(3): 487–504.

McDonough, W.F. and Sun, S.S., 1995. The composition of the Earth. Chemical Geology, 120(3–4): 223–253.

Middlemost, E.A.K., 1985. Magma and magmatic rocks. Longman, London and New York, 266 pp.

Moghaddasi, S.J., Ebrahimi, M. and Mohammadi, F., 2019. Mineralogy, geochemistry and genesis of Gozaldarreh iron deposit, southeast Zanjan. Journal of Economic Geology, 11(1): 33–55. (in Persian with English abstract)

Mokhtari, M.A.A., Hossein Zadeh, Gh. and Emami, M.H., 2013. Genesis of iron-apatite ores in Posht-e-Badam Block (Central Iran) using REE geochemistry. Journal of Earth System Science, 122(3): 795–807.

Mokhtari, M.A.A., Kouhestani, H. and Gholizadeh, K., 2019. Mineral chemistry and formation conditions of calc-silicate minerals of Qozlou Fe skarn deposit, Zanjan Province, NW Iran. Arabian Journal of Geosciences, 12(21): 1–28. (Article; 658)

Mokhtari, M.A.A., Sadeghi, M. and Nabatian, Gh., 2017. Geochemistry and potential resource of rare earth element in the IOA deposits of Tarom area, NW Iran. Ore Geology Reveiws, 92: 529–541.

Muller, D. and Groves, D.I., 1997. Ptassic igneous rocks and associated gold- copper mineralization. Springer Verlag, Switzerland, 242 pp.

Nabatian, Gh., 2012. Geology, Geochemistry and Evolution of Iron Oxide-apatite Deposits in the Tarom Volcano-plutonic Belt, Western Alborz. Unpublished Ph.D. Thesis, Tarbiat Modares University, Tehran, Iran, 375 pp. (in Persian with English abstract)

Nabatian, Gh. and Ghaderi, M., 2013. Oxygen isotope and fluid inclusion study of the Sorkheh-Dizaj iron oxide-apatite deposit, NW Iran. International Geology Review, 55(4): 397–410.

Nabatian, Gh. and Ghaderi, M., 2014. Mineralogy and geochemistry of the rare earth elements in iron oxide-apatite deposits of the Zanjan region. Scientific Quarterly Journal, Geosciences. 24(93): 157–170. (in Persian with English abstract)

Nabatian, Gh., Ghaderi, M., Corfu, F., Neubauer, F., Bernroider, M., Prokofiev, V. and Honarmand, M., 2014a. Geology, alteration, age and origin of iron oxide–apatite deposits in Upper Eocene quartz monzonite, Zanjan district, NW Iran. Mineralium Deposita, 49(2): 217–234.

Nabatian, G., Ghaderi, M., Daliran, F. and Rashidnejad Omran, N., 2012. Sorkhe- Dizaj iron oxide- apatite ore deposit in the Cenozoic Alborz- Azarbaijan magmatic belt, NW Iran. Resource Geology, 63(1): 42–56.

Nabatian, Gh., Ghaderi, M., Neubauer, F., Honarmand, M., Liu, X., Dong, Y., Jian, S.Y.,Quadt, A. and Bernroider, M., 2014b. Petrogenesis of Tarom high-potassic granitoids in the Alborz–Azarbaijan belt, Iran: Geochemical, U–Pb zircon and Sr–Nd–Pb isotopic constraints. Lithos, 184–187: 324–345.

Nabatian, G., Ghaderi, M., Rashidnejad Omran, N. and Daliran, F., 2009. Geochemistry and genesis of Sorkhe- Dizaj apatite- beraing iron oxide deposit, southeast Zanjan. Journal of Economic geology, 1(1): 19–46. (in Persian with English abstract)

Nezafati, N., 2006. Au-Sn-W-Cu-Mineralization in the Astaneh-Sarband Area, West Central Iran, including a comparison of the ores with ancient bronze artifacts from Western Asia. Unpublished Ph.D. Thesis, University of Tuebingen, Tuebingen, Germany, 114 pp.

Parak, T., 1975. Kiruna iron ores are not intrusive-magmatic ores of the Kiruna type. Economic Geology, 70(7): 1242–1258.

Schandle, E.S. and Gorton, M.P., 2002. Application of high field strength elements to discriminate tectonic settings in VMS environments. Economic Geology, 97(3): 629–642.

Shafaie Pour, N., Mokhtari, M.A.A., Kouhestani, H. and Honarmand, M., 2020. Petrology and geochemistry of the Qozlou granitoid and related Fe skarn (west Zanjan). Journal of Economic Geology, 12(1): 47–76. (in Persian with English abstract)

Shahbazi, S., Ghaderi, M. and Rashidnejhad Omran, N., 2015. Mineralization stages and iron source of Bashkand deposit based on mineralogy, structure, texture and geochemical evidence, Southwest of Soltanieh. Scientific Quarterly Journal, Geosciences, 24(95): 355–372. (in Persian with English abstract)

Shand, S.J., 1943. Eruptive Rocks: Their genesis, composition, classification, and their relation to ore-deposits with a chapter on meteorite. Johan Wiley and Sons, New York, 350 pp.

Whitney, D.L. and Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist, 95(1): 185–187.

Wilson, M., 1989. Igneous petrology. Unwin Hyman, London, 466 pp.

Wright, J.B. and McCurry, P., 1997. Geochemistry of calc-alkaline volcanic in northwestern Nigeria, and a possible PAN-AFRICAN suture zone. Earth and Planetary Science Letters, 37(1): 90–96.

Wu, F., Jahnb, B., Wildec, S.A., Lod, C.H., Yuie, T.F., Lina, Q., Gea, W. and Suna, D., 2003. Highly fractionated I-type granites in NE China II: isotopic geochemistry and implications for crustal growth in the Phanerozoic. Lithos, 67(3–4): 191–204.