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Тезисы международной конференции

Рудный потенциал щелочного, кимберлитового

 и карбонатитового магматизма

Abstracts of International conference

Ore potential of alkaline, kimberlite

and carbonatite magmatism

Microtraces in columbites according to LA-ICP-MS data

Vasilyev N.V.*, Udoratina O.V. **, Sitnikova M.A. ***

*FSUC IMGRE, Moscow, Russia,

**IG Komi SC UB RAS, Syktyvkar, Russia

***BGR Geozentrum, Hannover, Germany



In recent years mineralogical investigations actively have been using local methods to study isotope and microtrace mineral composition (LA-ICP-MS, SIMS). These methods allowed studying microcomposition of zircons, sheelites, columbites and other minerals from various genetic environments. Federal Agency for geosciences and resources (BGR, Hannover, Germany) supports program «Fingerprinting of conflict minerals: columbitetantalite (‘‘coltan’’) ores» for the study of microtrace composition of columbites and database is being developed. Within the framework of this program the certification of columbite-tantalum mineral ore Coltan is carried out to observe trading chains. This program plans to characterize the behavior of microtraces in columbites and tantalites from various pegmatites of Africa, and the results have been presented in a number of articles (for example Graupner et al., 2010).

We studied the behavior of columbites from deposits Ulug-Tanzek and Taikeu with -MS Element XR and laser ablation system New Wave UP193-FX with locality 10-80 mcm.

The greatest homogeneity was determined for 1k columbite, and it was chosen as reference sample for the second stage of investigations. At the second stage the microtraces in columbites from deposits Ulug-Tanzek, Zashikhinskoe, Novobobrovskoe ore field were studied in IMGRE with the use of ICP-MS Elan 6100 DRC and laser ablation system LSX-200 with locality 50 mcm.

The columbites from various genetic environments are characterized by considerable changes in Y, REE, Ta, Ti, Sn, W, Th, U contents. The behavior of rare earths is the most indicative regarding geochemical information about the microtrace composition.

The contents of rare earths were normalized by khondrites, and indicative Eu/Eu*, Ce/Ce*, La/Lu ratios were calculated.

The columbites from deposits in alkaline granites and metasomatites Ulug-Tanzek (eatern Tuva), Zashikhinskoe (Novoudin district of Irkutsk region), Taikey (Polar Urals) were studied. All the studied fractions of columbites from these objects are characterized by a pronounced negative europium anomaly, which is common for granite parageneses. The depth of the anomaly from early generations to the latest is not consistent. Columbite REE distribution is generally characterized by a sharp enrichment of heavy lantanoids La/Lu <<1. The columbites of the latest, possibly metasomatic generation, differ sharply from the early columbites by greater activity of light and medium lantanoids, and accordingly, equal-arm spectrum La/Lu ≈1, which is usual for minerals of late hydrothermal stage.

The columbites from Novobobrovsky ore field (Middle Timan) are also characterized by the enrichment of heavy REE, and the europium anomaly is not distinct. Fraction 460 was studied from melanocratic phenites, and also 10-A-1 from quartz-goethite vein. Both fractions are similar by microtrace composition.

The studies of microtrace composition in columbites give a certain genetic information about the genesis and evolution of rare metal mineralization. We characterized a number of fetures of the columbite mineralization connected with alkaline granites and phenites.


The studies are supported by the Program of RAS Presidium 12-П-5-1015 (block 4).



Graupner T., Melcher F., Gabler H.E., Sitnikova M., Bratz H. Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data // Mineralogical Magazine, 2010, Vol. 74(4), pp. 691–713.