Инд. авторы:	Prokopyev I.R, Doroshkevich A.G., Zhumadilova D.V., Starikova A.E., Nugumanova Y.N., Vladykin N.V.
Заглавие:	Petrogenesis of Zr-Nb (REE) carbonatites from the Arbarastakh complex (Aldan Shield, Russia): Mineralogy and inclusion data
Библ. ссылка:	Prokopyev I.R, Doroshkevich A.G., Zhumadilova D.V., Starikova A.E., Nugumanova Y.N., Vladykin N.V. Petrogenesis of Zr-Nb (REE) carbonatites from the Arbarastakh complex (Aldan Shield, Russia): Mineralogy and inclusion data // Ore Geology Reviews. - 2021. - Vol.131. - Art.104042. - ISSN 0169-1368.
Внешние системы:	DOI: 10.1016/j.oregeorev.2021.104042; WoS: 000632182300001;
Реферат:	eng: The Arbarastakh Neoproterozoic ultramafic carbonatite complex is located in the southwestern part of the Siberian Craton (Aldan Shield) and contains ore-bearing Zr-Nb (REE) carbonatites and phoscorites. Carbonatites are mainly represented by calcite and silicocarbonatite varieties. The primary minerals composing the carbonatites are calcite and dolomite, as well as phlogopite, clinopyroxene, fluorapatite, amphibole, fluorite, K-feld-spar and feldspathoids. Olivine (forsterite), Ti-magnetite, apatite, phlogopite, calcite, dolomite and the minor spinel group minerals form the primary phoscorites. The ore-bearing Zr-Nb mineral assemblages of the phoscorites and carbonatites include accessory zircon, zirconolite, perovskite, pyrochlore and baddeleyite. The Ba-Sr-REE hydrothermal mineralisation consists of ancylite-(Ce), bastnaesite-(Ce) and burbankite, as well as barite-celestite, strontianite, barytocalcite, and rare Cu-Fe sulphides. The silicocarbonatites and carbonatites formed in multiple stages from a single alkaline Ca-Na-K-silicocarbonatite melt, while the phoscorites are products of differentiation of the carbonatitic melt and were crystallised from an Fe-rich phosphate-carbonate melt at temperatures of more than 720 degrees C. The silicate-phosphate-carbonate melts were responsible for the Zr-Nb mineralisation of the carbonatites at temperatures of more than 540-575 degrees C; the hydrothermal REE-bearing mineral assemblages crystallised from saline (60-70 wt%) carbonatitic fluids of Na-Ca-Mg-F-carbonate composition at a minimum temperature range of 350-300 degrees C. The Ca-Sr-carbonate as well as the Na-hydro-carbonate fluids were responsible for the Ba-Sr-REE mineralisation of the phoscorites at similar to 500-480 and 450-430 degrees C.
Ключевые слова:	Siberian craton; Aldan shield; Phoscorites; Carbonatites;
Издано:	2021
Физ. характеристика:	104042