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

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Chebotarev D, Doroshkevich AG, Klemd R, Karmanov N
Zeitschrift: Periodico Di Mineralogia
Jahr der Veröffentlichung: 2017
Band: 86
Heftnummer: 2
Seitenbereich: 99-118
ISSN: 0369-8963
Sprache: Englisch


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-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

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


Einrichtungen weiterer Autorinnen und Autoren

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


Zitierweisen

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.

BibTeX: 

Zuletzt aktualisiert 2019-22-05 um 00:10