Rare earth element (REE) resources of Turkey: An overview of their characteristics and origin
Yıl 2019,
Cilt: 159 Sayı: 159, 129 - 143, 15.08.2019
Hüseyin Öztürk
,
Nurullah Hanilçi
,
Sinan Altuncu
,
Cem Kasapçı
Öz
The Rare Earth Elements (REE)
deposits and mineralization of Turkey can be divided into four types based on
their geological setting and origin. First are deposits associated with
carbonatite- alkaline magmatic rocks, rich in Light Rare Earth Elements (LREE).
The best known examples are the Kızılcaören (Eskişehir) and Kuluncak (Malatya)
deposits with TREE grades of 2.9% and 0.7% respectively, and typical enrichment
of La-Ce. Lower grade REE mineralization at Keban (0.05% TREE) and Divriği
(0.13% TREE) is associated with abundant fluorite and all four occurrences show
similar ranges for homogenization temperatures and salinities for fluid
inclusions in fluorite and REE profiles. The second type are Triassic shales
and the bauxites formed from them in the Bolkardağı region. Enrichment of Heavy
REE (HREE) is typical and TREE grades are about 0.15% in bauxites and its
protolith. These occurrences are geochemically similar to “ion adsorption type”
deposits associated with lateritic clay on the weathered granitic rocks of
China. Third is the placer type, represented by the Çanaklı (Burdur) deposit
which is enriched in U, Th and HREE and heavy minerals such as; magnetite,
zircon and rutile and has an average grade of about 0.08% TREE. The fourth
potential source of REE is phosphorites. These rocks host the world’s largest
resources elsewhere, however the Cretaceous Mazidag deposits in Turkey are very
low grade (40ppm TREE) and clearly uneconomic. Consideration of the
environmental and health issues associated with exploitation and processing of
REE has identified the more favorable outcomes associated with exploitation of
the ion adsorption type of deposits and justification for further evaluation of
the resources and processing technologies that would enable exploitation of
REE-enriched bauxites in the Bolkardağı region.
Teşekkür
The authors are grateful to the General Directorate of Eti Maden for permitting fi eld study in the Kızılcaören Deposit and to the İstanbul University- Cerrahpaşa Scientifi c Research Projects Unit (Project no: 54348) for their fi nancial contributions.
Kaynakça
- Al-Shereideh, S.A., Khaled Tarawneh, K., Nawafleh, H., El- Radaideh, N., Moumani, K. 2010. Geology and Mineralogy of Jabal Kabid Phosphorite Deposits, Southeastern Jordan. Jordan Journal of Earth and Environmental Sciences 3, 99-110
- Altuncu, S. 2009. Türkiye FluoritYataklarının Karşılaştırmalı İncelenmesi. Doktora Tezi, İstanbul Üniversitesi, Fen Bilimleri Enstitüsü, 147 s. (unpublished).
- Apaydın, N., Erseçen, N.1981. Known ore and mineral resources of Turkey: Ankara, Mineral Research and Exploration Institute of Turkey, 67 p.
- Ayhan, A., Karadağ, M., M. 1985. Şarkikaraağaç (Isparta) güneyinde bulunan boksitli demir ve demirli boksit yataklarının jeolojisi ve oluşumu. Türkiye Jeoloji Kurumu Bülteni 28, 137-146.
- Berger, A., Janots, E., Gnos, E., Frei, R., Bernier, F. 2014. Rare earth element mineralogy and geochemistry in a laterite profile from Madagascar. Applied Geochemistry 41, 218–228.
- Boynton, W.V. 1984. Geochemistry of the rare earth elements: meteorite studies. In: Rare earth element geochemistry, P.Henderson (ed.), Elsevier, 63- 114.
- Boztuğ, D., Harlavan, Y., Arehart, G.B., Satır, M., Avcı, N. 2007. K-Ar age, whole-rock and isotope geochemistry of A-type granitoids in the Divriği- Sivas region, eastern-central Anatolia, Turkey. Lithos 97, 193-218.
- Chen, Z. 2011. Global Rare Earth Resources and Scenarios for Future Rare Earth Industry, Journal of Rare Earths 29, 1-6
- Chen, B.H., Wu, F.H., Liu, F. F. 2001. Experimental study on the effects of organic acids on the dissolution of REE in the weathering crust of granite. Chinese Journal of Geochemistry 20, 144–151.
- Chi, R., A. Tian, J. 2008. Weathered crust elution-deposited rare earth ores: New York, Nova Science Publishers, 288 p.
- Cox J.J. Fayram, T. 2013. NI 43-101 Technical Report on the Aksu Diamas Rare Earth Element Project, Isparta district, Turkey. AMK Mineral Inc. Toronto, Canada, 29 p.
- Deady, E., Goodenough K., Lacinska A., Hardy L., Shaw R. 2016a. Rare earth element placer deposits and alkaline volcanics: a case study from Aksu Diamas, Çanaklı, Turkey. Applied Earth Science 125, 79-80.
- Deady, E.A., Muchos, E., Goodenough, K., Williamson, B. J., Wall, F. 2016b. A review of the potential for rare earth element resources from European red muds: examples from Seydişehir, Turkey and Parnassus-Giona, Greece Mineralogical Magazine 80, 43-61.
- Emsbo, P., McLaughlin P.I., George N., Breit, G.N., Edward A. du Bray., Koenig, A.E. 2015. Rare earth elements in sedimentary phosphate deposits: Solution to the global REE crisis? Gondwana Research 27, 2, 776-785
- Hanilçi, N. 2013. Geological and geochemical evolution of the Bolkardaǧi bauxite deposits, Karaman, Turkey: Transformation from shale to bauxite. Journal of Geochemical Exploration 133, 118- 137.
- Haque, N., Hughes, A., Lim, S., Vernon, C. 2014. Rare earth elements: Overview of mining mineralogy uses sustainability and environmental impact. Resources 3, 614–635.
- Hewett, D.F. 1954. History of discovery at Mountain Pass, California. In Rare-earth mineral deposits of the Mountain Pass District, San Bernardino, County, California. USGS Prof. 261 p.
- İmamoğlu, M.Ş., Nathan, Y., Coban H., Soudry D., Glenn C. 2009. Geochemical, mineralogical and isotopic signatures of the Semikan, West Kasrık Turkish phosphorites from the Derik–Mazıdağı–Mardin area, SE Anatolia. International Journal of Earth Sciences (Geol Rundsch) 98,1679–1690
- Kaplan, H. 1977a. Eskişehir-Sivrihisar-Kızılcaören köyü yakın güneyi bastnaesit-barit -flourit kompleks cevher yatağı nihai etüd raporu, Maden Tetkik ve Arama Genel Müdürlüğü Rad. Min. Servisi, Rapor. No 482.
- Kaplan, H. 1977b. Eskişehir-Sivrihisar-Kızılcaören köyü yakın güneyi Nadir Toprak Elementleri ve toryum kompleks cevher yatağı: Jeoloji Mühendisliği Dergisi 2, 29-34.
- Karadağ, M. 1987. Seydişehir bölgesi boksitlerinin jeolojik petrografik ve jenetik incelenmesi: Doktora Tezi, Selçuk Üniv., Fen Bil. Ens., (yayımlanmamış), 265 s.
- Karadağ, M. M., Arık, F., Ayhan, A., Döyen., A., Küpeli, Ş., Zedef, V. 2006. Mortaş (Seydişehir-Konya) boksit yatağının Nadir Toprak element (NTE) potansiyeli. 59. Türkiye Jeoloji Kurultayı, Bildiri Özleri Kitabı, 154-156.
- Karadaǧ, M.M., Küpeli, Ş., Arık, F., Ayhan, A., Zedef, V., Döyen, A. 2009. Rare earth element (REE) geochemistry and genetic implications of the Mortaş-bauxite deposit (Seydişehir/Konya- Southern Turkey). Chem. Erde Geochem. 69, 143-159.
- Kato, Y., Fujinaga, K., Nakamura, K., Takaya, Y., Kitamura, K., Ohta, J., Toda, R., Nakashima, T., Iwamori, H. 2011. Deep-sea mud in the Pacific Ocean as a potential resource for rare-earth elements. Nature Geoscience 4, 535-539.
- Kuşcu, İ, Tosdal, RM., Gençalioğlu-Kuşcu, G., Friedman, R. 2013. Late Cretaceous to middle Eocene magmatism and metallogeny of a portion of the Southeastern Anatolian Orogenic Belt, east central Turkey, Economic Geology 108, 641-666
- Leo, G. W., Marvin, R. F., Mehnert, H. H. 1974. Geologic framework of the Kuluncak-Sofular area, east- central Turkey, and K-Ar ages of igneous rocks: Geological Society of America Bulletin 85, 1785- 1788.
- Liu, X.W., Byrne, R.H. 1998. Comprehensive investigation of yttrium and rare earth element complexation by carbonate ions using ICP-Mass Spectrometry: Journal of Solution Chemistry 27, 803-815.
- Migdisov, A. A., Williams-Jones A. E., Wagner, T. 2009. An experimental study of the solubility and speciation of the Rare Earth Elements (III) in fluoride-and chloride-bearing aqueous solutions at temperatures up to 300 C. Geochimica et Cosmochimica Acta, 7087-7109.
- Monod, O. 1967. Batı Toros Kalkerlerinin temelindeki Seydişelıir şistlerinde bulunan Ordovisyen bir fauna. Maden Tetkik ve Arama Dergisi 69, 76-86.
- Nikiforov A.V., Öztürk, H., Altuncu, S., Lebedev, V.A. 2014. Kızılcaören Ore-bearing Complex with Carbonatites (Northwestern Anatolia, Turkey): Formation Time and Mineralogy of Rocks. Geology of Ore Deposits 56, 35-60.
- Özgenç, İ. 1993. Kızılcaören (Sivrihisar-Eskişehir) karbotermal bastneazit-fluorit-barit yatağının jeolojisi ve NTE jeokimyası: Türkiye Jeoloji Bülteni 36, 75-80.
- Özgenç, İ. Kibici, Y. 1994. The geology and chemical- mineralogical properties of Britholite veins of Başören village (Kuluncak-Malatya), Turkey. Geological Bulletin of Turkey 37, 77-85.
- Öztürk, H., Hein, J., Hanilçi, N. 2002. Genesis of the Doğankuzu and Mortaş bauxite deposits, Taurides, Turkey: Separation of Al, Fe, and Mn and implications for passive margin metallogeny. Economic Geology 97, 1063-1077.
- Paleparthi, J., Chakrabarti, R., Banerjee, D., Guin, R., Ghosal, S., Agrahari, S., Sengupta, D. 2017. Economically viable rare earth element deposits along beach placers of Andhra Pradesh, eastern coast of India. Arabian Journal of Geosciences,2-8.
- Papangelakis, V.G., Moldoveanu, G.A. 2014. Recovery of rare earth elements from clay minerals. In: Proceedings of the 1st Rare Earth Resources Conference, Milos, 191-202.
- Rocha, A., Schissel, D., Sprecher, A., de Tarso, P., Goode, J. 2013. Process Development for the Serra Verde Weathered Crust Elution-deposited Rare Earth Deposit in Brazil, in Rare Earth Elements-Proceedings of the 52nd Conference of Metallurgists (COM 2013), London, I., Goode, J., Moldoveanu, G., and Rayat, M. eds., Metallurgical Society of the Canadian Institute of Mining, Metallurgy and Petroleum (MetSoc- CIM), Montreal, Canada, 277-288.
- Roskill, 2011. Rare Earths Yttrium: Market Outlook to 2015, 14th edition, 2011: Roskill Information Services, Ltd., London, 492 p.
- Sanematsu, K., Watanabe, Y. 2016. Characteristics and Genesis of Ion Adsorption-Type Rare Earth Element Deposits. Society of Economic Geologists, Inc. Reviews in Economic Geology 18, 55-79.
- Stumpel, E.F., Kırıkoğlu, M.S. 1985. Fluorite-Barite-Rare Earths Deposits at Kızılcaören, Turkey. Mitt. Österr. Geol. Ges. 78, 193-200.
- Voßenkaul, D., Stoltz, N.B., Meyer, F.M., Friedrich, B. 2015. Extraction of Rare Earth Elements from Ion Adsorption Clays, European Metallurgical Conference. Proceedings of EMC, Germany, 1-11.
- Wu, C.Y., Huang, D.H., Guo, Z.G. 1990. REE geochemistry in the weathered crust of granites, Longnan area, Jiangxi Province. Acta W Geologica Sinica 3, 193-210.
- Xu, C., Taylor, R.N., Li, W., Kynicky, J., Chakhmouradian, A.R., Song, W. 2012. Comparison of fluorite geochemistry from REE deposits in the Panxi region and Bayan Obo, China. Journal Asian Earth Sciences 57, 76-89.
- Yang, X.J., Lin, A.J., Li, X.L., Wu, Y.D., Zhou, W.B., Chen, Z.H. 2013. China’s ion-adsorption rare earth resources, mining consequences and preservation. Environmental Development, 8, 131-136.
- Yang, X.M., Yang, X.Y., Zheng, Y.F., Le Bas, M.J. 2003. A rare earth element-rich carbonatite dyke at Bayan Obo, Inner Mongolia, North China Mineralogy and Petrology, 78 , pp. 93-110.
- Yang, Y.Q., Hu, Z.S., Luo, Z.M. 1981. Geological characteristics of mineralization of rare earth deposits of the ion-adsorption type and their prospecting direction. Bulletin of Institute of Mineral Deposit, Chinese Academy of Geological Sciences 2, 102-118 (in Chinese with English abstract).
- Yusoff, Z.M., Ngwenya, B.T., Parsons, I. 2013. Mobility and fractionation of REEs during deep weathering of geochemically contrasting granites in a tropical setting, Malaysia. Chemical Geology 349, 71-86.
- Zhang, Z.H. 1990. A study on weathering crust ion adsorption type REE deposit, South China: Contributions to Geology and Mineral Resources Research 5, 57-, 71 (in Chinese with English abstract).
Yıl 2019,
Cilt: 159 Sayı: 159, 129 - 143, 15.08.2019
Hüseyin Öztürk
,
Nurullah Hanilçi
,
Sinan Altuncu
,
Cem Kasapçı
Kaynakça
- Al-Shereideh, S.A., Khaled Tarawneh, K., Nawafleh, H., El- Radaideh, N., Moumani, K. 2010. Geology and Mineralogy of Jabal Kabid Phosphorite Deposits, Southeastern Jordan. Jordan Journal of Earth and Environmental Sciences 3, 99-110
- Altuncu, S. 2009. Türkiye FluoritYataklarının Karşılaştırmalı İncelenmesi. Doktora Tezi, İstanbul Üniversitesi, Fen Bilimleri Enstitüsü, 147 s. (unpublished).
- Apaydın, N., Erseçen, N.1981. Known ore and mineral resources of Turkey: Ankara, Mineral Research and Exploration Institute of Turkey, 67 p.
- Ayhan, A., Karadağ, M., M. 1985. Şarkikaraağaç (Isparta) güneyinde bulunan boksitli demir ve demirli boksit yataklarının jeolojisi ve oluşumu. Türkiye Jeoloji Kurumu Bülteni 28, 137-146.
- Berger, A., Janots, E., Gnos, E., Frei, R., Bernier, F. 2014. Rare earth element mineralogy and geochemistry in a laterite profile from Madagascar. Applied Geochemistry 41, 218–228.
- Boynton, W.V. 1984. Geochemistry of the rare earth elements: meteorite studies. In: Rare earth element geochemistry, P.Henderson (ed.), Elsevier, 63- 114.
- Boztuğ, D., Harlavan, Y., Arehart, G.B., Satır, M., Avcı, N. 2007. K-Ar age, whole-rock and isotope geochemistry of A-type granitoids in the Divriği- Sivas region, eastern-central Anatolia, Turkey. Lithos 97, 193-218.
- Chen, Z. 2011. Global Rare Earth Resources and Scenarios for Future Rare Earth Industry, Journal of Rare Earths 29, 1-6
- Chen, B.H., Wu, F.H., Liu, F. F. 2001. Experimental study on the effects of organic acids on the dissolution of REE in the weathering crust of granite. Chinese Journal of Geochemistry 20, 144–151.
- Chi, R., A. Tian, J. 2008. Weathered crust elution-deposited rare earth ores: New York, Nova Science Publishers, 288 p.
- Cox J.J. Fayram, T. 2013. NI 43-101 Technical Report on the Aksu Diamas Rare Earth Element Project, Isparta district, Turkey. AMK Mineral Inc. Toronto, Canada, 29 p.
- Deady, E., Goodenough K., Lacinska A., Hardy L., Shaw R. 2016a. Rare earth element placer deposits and alkaline volcanics: a case study from Aksu Diamas, Çanaklı, Turkey. Applied Earth Science 125, 79-80.
- Deady, E.A., Muchos, E., Goodenough, K., Williamson, B. J., Wall, F. 2016b. A review of the potential for rare earth element resources from European red muds: examples from Seydişehir, Turkey and Parnassus-Giona, Greece Mineralogical Magazine 80, 43-61.
- Emsbo, P., McLaughlin P.I., George N., Breit, G.N., Edward A. du Bray., Koenig, A.E. 2015. Rare earth elements in sedimentary phosphate deposits: Solution to the global REE crisis? Gondwana Research 27, 2, 776-785
- Hanilçi, N. 2013. Geological and geochemical evolution of the Bolkardaǧi bauxite deposits, Karaman, Turkey: Transformation from shale to bauxite. Journal of Geochemical Exploration 133, 118- 137.
- Haque, N., Hughes, A., Lim, S., Vernon, C. 2014. Rare earth elements: Overview of mining mineralogy uses sustainability and environmental impact. Resources 3, 614–635.
- Hewett, D.F. 1954. History of discovery at Mountain Pass, California. In Rare-earth mineral deposits of the Mountain Pass District, San Bernardino, County, California. USGS Prof. 261 p.
- İmamoğlu, M.Ş., Nathan, Y., Coban H., Soudry D., Glenn C. 2009. Geochemical, mineralogical and isotopic signatures of the Semikan, West Kasrık Turkish phosphorites from the Derik–Mazıdağı–Mardin area, SE Anatolia. International Journal of Earth Sciences (Geol Rundsch) 98,1679–1690
- Kaplan, H. 1977a. Eskişehir-Sivrihisar-Kızılcaören köyü yakın güneyi bastnaesit-barit -flourit kompleks cevher yatağı nihai etüd raporu, Maden Tetkik ve Arama Genel Müdürlüğü Rad. Min. Servisi, Rapor. No 482.
- Kaplan, H. 1977b. Eskişehir-Sivrihisar-Kızılcaören köyü yakın güneyi Nadir Toprak Elementleri ve toryum kompleks cevher yatağı: Jeoloji Mühendisliği Dergisi 2, 29-34.
- Karadağ, M. 1987. Seydişehir bölgesi boksitlerinin jeolojik petrografik ve jenetik incelenmesi: Doktora Tezi, Selçuk Üniv., Fen Bil. Ens., (yayımlanmamış), 265 s.
- Karadağ, M. M., Arık, F., Ayhan, A., Döyen., A., Küpeli, Ş., Zedef, V. 2006. Mortaş (Seydişehir-Konya) boksit yatağının Nadir Toprak element (NTE) potansiyeli. 59. Türkiye Jeoloji Kurultayı, Bildiri Özleri Kitabı, 154-156.
- Karadaǧ, M.M., Küpeli, Ş., Arık, F., Ayhan, A., Zedef, V., Döyen, A. 2009. Rare earth element (REE) geochemistry and genetic implications of the Mortaş-bauxite deposit (Seydişehir/Konya- Southern Turkey). Chem. Erde Geochem. 69, 143-159.
- Kato, Y., Fujinaga, K., Nakamura, K., Takaya, Y., Kitamura, K., Ohta, J., Toda, R., Nakashima, T., Iwamori, H. 2011. Deep-sea mud in the Pacific Ocean as a potential resource for rare-earth elements. Nature Geoscience 4, 535-539.
- Kuşcu, İ, Tosdal, RM., Gençalioğlu-Kuşcu, G., Friedman, R. 2013. Late Cretaceous to middle Eocene magmatism and metallogeny of a portion of the Southeastern Anatolian Orogenic Belt, east central Turkey, Economic Geology 108, 641-666
- Leo, G. W., Marvin, R. F., Mehnert, H. H. 1974. Geologic framework of the Kuluncak-Sofular area, east- central Turkey, and K-Ar ages of igneous rocks: Geological Society of America Bulletin 85, 1785- 1788.
- Liu, X.W., Byrne, R.H. 1998. Comprehensive investigation of yttrium and rare earth element complexation by carbonate ions using ICP-Mass Spectrometry: Journal of Solution Chemistry 27, 803-815.
- Migdisov, A. A., Williams-Jones A. E., Wagner, T. 2009. An experimental study of the solubility and speciation of the Rare Earth Elements (III) in fluoride-and chloride-bearing aqueous solutions at temperatures up to 300 C. Geochimica et Cosmochimica Acta, 7087-7109.
- Monod, O. 1967. Batı Toros Kalkerlerinin temelindeki Seydişelıir şistlerinde bulunan Ordovisyen bir fauna. Maden Tetkik ve Arama Dergisi 69, 76-86.
- Nikiforov A.V., Öztürk, H., Altuncu, S., Lebedev, V.A. 2014. Kızılcaören Ore-bearing Complex with Carbonatites (Northwestern Anatolia, Turkey): Formation Time and Mineralogy of Rocks. Geology of Ore Deposits 56, 35-60.
- Özgenç, İ. 1993. Kızılcaören (Sivrihisar-Eskişehir) karbotermal bastneazit-fluorit-barit yatağının jeolojisi ve NTE jeokimyası: Türkiye Jeoloji Bülteni 36, 75-80.
- Özgenç, İ. Kibici, Y. 1994. The geology and chemical- mineralogical properties of Britholite veins of Başören village (Kuluncak-Malatya), Turkey. Geological Bulletin of Turkey 37, 77-85.
- Öztürk, H., Hein, J., Hanilçi, N. 2002. Genesis of the Doğankuzu and Mortaş bauxite deposits, Taurides, Turkey: Separation of Al, Fe, and Mn and implications for passive margin metallogeny. Economic Geology 97, 1063-1077.
- Paleparthi, J., Chakrabarti, R., Banerjee, D., Guin, R., Ghosal, S., Agrahari, S., Sengupta, D. 2017. Economically viable rare earth element deposits along beach placers of Andhra Pradesh, eastern coast of India. Arabian Journal of Geosciences,2-8.
- Papangelakis, V.G., Moldoveanu, G.A. 2014. Recovery of rare earth elements from clay minerals. In: Proceedings of the 1st Rare Earth Resources Conference, Milos, 191-202.
- Rocha, A., Schissel, D., Sprecher, A., de Tarso, P., Goode, J. 2013. Process Development for the Serra Verde Weathered Crust Elution-deposited Rare Earth Deposit in Brazil, in Rare Earth Elements-Proceedings of the 52nd Conference of Metallurgists (COM 2013), London, I., Goode, J., Moldoveanu, G., and Rayat, M. eds., Metallurgical Society of the Canadian Institute of Mining, Metallurgy and Petroleum (MetSoc- CIM), Montreal, Canada, 277-288.
- Roskill, 2011. Rare Earths Yttrium: Market Outlook to 2015, 14th edition, 2011: Roskill Information Services, Ltd., London, 492 p.
- Sanematsu, K., Watanabe, Y. 2016. Characteristics and Genesis of Ion Adsorption-Type Rare Earth Element Deposits. Society of Economic Geologists, Inc. Reviews in Economic Geology 18, 55-79.
- Stumpel, E.F., Kırıkoğlu, M.S. 1985. Fluorite-Barite-Rare Earths Deposits at Kızılcaören, Turkey. Mitt. Österr. Geol. Ges. 78, 193-200.
- Voßenkaul, D., Stoltz, N.B., Meyer, F.M., Friedrich, B. 2015. Extraction of Rare Earth Elements from Ion Adsorption Clays, European Metallurgical Conference. Proceedings of EMC, Germany, 1-11.
- Wu, C.Y., Huang, D.H., Guo, Z.G. 1990. REE geochemistry in the weathered crust of granites, Longnan area, Jiangxi Province. Acta W Geologica Sinica 3, 193-210.
- Xu, C., Taylor, R.N., Li, W., Kynicky, J., Chakhmouradian, A.R., Song, W. 2012. Comparison of fluorite geochemistry from REE deposits in the Panxi region and Bayan Obo, China. Journal Asian Earth Sciences 57, 76-89.
- Yang, X.J., Lin, A.J., Li, X.L., Wu, Y.D., Zhou, W.B., Chen, Z.H. 2013. China’s ion-adsorption rare earth resources, mining consequences and preservation. Environmental Development, 8, 131-136.
- Yang, X.M., Yang, X.Y., Zheng, Y.F., Le Bas, M.J. 2003. A rare earth element-rich carbonatite dyke at Bayan Obo, Inner Mongolia, North China Mineralogy and Petrology, 78 , pp. 93-110.
- Yang, Y.Q., Hu, Z.S., Luo, Z.M. 1981. Geological characteristics of mineralization of rare earth deposits of the ion-adsorption type and their prospecting direction. Bulletin of Institute of Mineral Deposit, Chinese Academy of Geological Sciences 2, 102-118 (in Chinese with English abstract).
- Yusoff, Z.M., Ngwenya, B.T., Parsons, I. 2013. Mobility and fractionation of REEs during deep weathering of geochemically contrasting granites in a tropical setting, Malaysia. Chemical Geology 349, 71-86.
- Zhang, Z.H. 1990. A study on weathering crust ion adsorption type REE deposit, South China: Contributions to Geology and Mineral Resources Research 5, 57-, 71 (in Chinese with English abstract).