Petrography

• Published in: Mineralogy and Petrology
• Main Authors: Doroshkevich, Anna G., Sergeev, Sergey A., Ernst, Richard E., Ponomarev, Jean D., Redina, Anna A., Chebotarev, Dmitry A., Nikolenko, Anna M., Dultsev, Vladislav F., Moroz, Tatyana N., Prokopyev, Ilya R., Minakov, Alexey V.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2019
• Subjects: петрография; минералогия; геохронология; карбонатиты; щелочные породы; Центрально-Алданская магнезиокарбонатитовая провинция; Южная Якутия; Aldan; Stanovoy; Yakutia; Якути*; Якутия
• Online Access: https://doi.org/10.1007/s00710-019-00661-3; http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000720748

The N-S trending Central-Aldan magnesiocarbonatite province is located in the Aldan-Stanovoy shield (South Yakutia Russia). Several apatite-dolomitic carbonatite occurrences were studied: Seligdar Muostalaah Ust-Chulman and Birikeen. Mineralogical and petrographic investigations indicate intense hydrothermal-metasomatic alteration and metamorphism which are reflected in the evolution of the mineral parageneses. The primary minerals are fluorapatite magnetite ilmenite dolomite K-feldspar phlogopite and accessory zircon titanite baddeleyite and thorite. The hydrothermal-metasomatic minerals are quartz calcite and siderite aggregates with haematite monazite-(Ce) xenotime-(Y) rutile-(Nb) barite-(Sr) anhydrite ancylite-(Ce) and rare sulphide mineral phases. Alkaline rocks associated with the Muostalaah complex were also studied. The following U-Pb ages have been obtained (Ma): 1930 ± 7 for Muostalaah alkaline basic rocks 1906 ± 6 for Muostalaah carbonatites and 1880 ± 13 and 1878 ± 17 for Seligdar and Ust-Chulman carbonatites respectively.