title: Rare earth elements upon assessment of reasons of the geophagy in Sikhote-Alin region (Russian Federation), Africa and other world regions.
abstract: Rocks eaten by wild animals on the Bolshoy Shanduyskiy kudur in the Sikhote-Alin region (Russian Federation) are zeolite-clay mineral complexes-products of weathering of zeolitized vitric tuffs of rhyolite composition, deposited in aqueous medium within the volcanic caldera of about 55 million years ago. By composition of rock-forming oxides, the tuffs refer to high-potassium calc-alkaline series. In trace elements of most favorite kudurites of the Bolshoy Shanduyskiy kudur, there are significantly increased contents of most of rare earth elements (2-5 times in comparison with surrounding rocks). The results of our analysis of geological and geochemical data on kudurs and kudurites in another part of the Sikhote-Alin, as well as on other regions of the world (particularly, in Africa and Indonesia), taking into account new data on the prevalence of rare earth elements in living matter and their medical and biological properties, enable us to consider the version of causal connection of the geophagy with rare earth elements.
authors.affiliation: Pacific Geographical Institute of Far Eastern Branch, Russian Academy of Sciences, 7 Radio St., Vladivostok, Russia, 690041.|Far Eastern Federal University, 8 Sukhanova St., Vladivostok, Russia, 690091.
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Panichev
authors.affiliation: Far Eastern Institute of Geology of Far Eastern Branch, Russian Academy of Sciences, 159 100-letiya Vladivostoku St., Vladivostok, Russia, 690022.
authors.forename: Vladimir K
authors.initials: VK
authors.lastname: Popov
authors.affiliation: Far Eastern Institute of Geology of Far Eastern Branch, Russian Academy of Sciences, 159 100-letiya Vladivostoku St., Vladivostok, Russia, 690022.
authors.forename: Igor Yu
authors.initials: IY
authors.lastname: Chekryzhov
authors.affiliation: Pacific Geographical Institute of Far Eastern Branch, Russian Academy of Sciences, 7 Radio St., Vladivostok, Russia, 690041. seryodkinivan@inbox.ru.|Far Eastern Federal University, 8 Sukhanova St., Vladivostok, Russia, 690091. seryodkinivan@inbox.ru.
authors.forename: Ivan V
authors.initials: IV
authors.lastname: Seryodkin
authors.affiliation: Lomonosov Moscow State University, 1 Leninskiye Gory, Moscow, Russia, 119991.
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Stolyarova
authors.affiliation: Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, 35 Staromonetny Pereulok, Moscow, Russia, 119017.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Zakusin
authors.affiliation: Far Eastern Federal University, 8 Sukhanova St., Vladivostok, Russia, 690091.
authors.forename: Alexandr A
authors.initials: AA
authors.lastname: Sergievich
authors.affiliation: Technical Institute (Branch) of North-Eastern Federal University Named After M. K. Ammosov, 16 Kravchenko St., Nerungri, Russia, 678960.
authors.forename: Pavel P
authors.initials: PP
authors.lastname: Khoroshikh
mesh_terms: D000349:Africa; D000818:Animals; D008674:Metals, Rare Earth; D008903:Minerals / Q000032:analysis*; D010842:Pica; D012426:Russia; D014131:Trace Elements / Q000032:analysis
chemical_list: D008674:Metals, Rare Earth; D008903:Minerals; D014131:Trace Elements
keywords: Geophagy; Kudur; Lanthanides; Mineral lick; Rare earth elements; Sikhote-Alin