Evolution of Nb-mineralization in the Chuktukon carbonatite massif, Chadobets upland (Krasnoyarsk Territory, Russia)

Journal article


Publication Details

Author(s): Chebotarev D, Doroshkevich AG, Klemd R, Karmanov N
Journal: Periodico Di Mineralogia
Publication year: 2017
Volume: 86
Journal issue: 2
Pages range: 99-118
ISSN: 0369-8963
Language: English


Abstract

This paper reports on new study of the niobium mineralization of the Chuktukoncarbonatites and weathering crust. The Chuktukon massif is located within the Chadobets upland in the southwestern part of the Siberian Platform. Primary Nb-minerals of carbonatites are pyrochlore group minerals (mainly fluorcalciopyrochlore),newly discovered mineral - rippite [K2(Nb,Ti)2(Si4O12)O(O,F)], and Nb-rutile.Fluorcalciopyrochlore has oscillatory zonation with variations in content of Nb2O5 (59- 67 wt%), TiO2 (2.8-5 wt%), SiO2 (up to 3.3 wt%), CaO (15.9-17.7 wt%), Na2O (7-8.2 wt%) and F (4.5-5.13 wt%). Rippite is Nb-rich silicate (~44 wt% of Nb2O5) andcontains inclusions of primary fluorcalciopyrochlore. Nb-rutile form oscillatory and sectorial hourglass-like zoned crystals with variable content of Nb2O5 (9-14.7 wt%). The carbonatites underwent strong hydrothermal alteration and subsequent weathering, and, as a result, in the hydrothermally altered carbonatites and weathering crust the primary Nb-minerals become unstable, dissolve and decompose, and Nb-bearing goethite (up to 4.3 wt% of Nb2O5) formed. Primary fluorcalciopyrochlore is replaced by the secondary Sr-, Pb-, LREE- and Ba-rich pyrochlore group minerals.


FAU Authors / FAU Editors

Klemd, Reiner Prof. Dr.
Professur für Geochemie und Lagerstättenkunde


External institutions with authors

Novosibirsk State University (NSU)
Siberian Branch of the Russian Academy of Sciences


How to cite

APA:
Chebotarev, D., Doroshkevich, A.G., Klemd, R., & Karmanov, N. (2017). Evolution of Nb-mineralization in the Chuktukon carbonatite massif, Chadobets upland (Krasnoyarsk Territory, Russia). Periodico Di Mineralogia, 86(2), 99-118. https://dx.doi.org/10.2451/2017PM733

MLA:
Chebotarev, Dmitry, et al. "Evolution of Nb-mineralization in the Chuktukon carbonatite massif, Chadobets upland (Krasnoyarsk Territory, Russia)." Periodico Di Mineralogia 86.2 (2017): 99-118.

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Last updated on 2019-22-05 at 00:10