Genesis and crystallization of ultramafic alkaline carbonatite magmas of Siberia: ore potential, mantle sources, and relationship with plume activity

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• 作者：N.V. Vladykin ^{vlad@igc.irk.ru" class="auth_mail" title="E-mail the corresponding author}
• 关键词：petrology of alkaline rocks ; ore potential ; trace element and isotope geochemistry ; mantle sources ; magma genesis model
• 刊名：Russian Geology and Geophysics
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：57
• 期：5
• 页码：698-712
• 全文大小：2220 K

文摘

This paper discusses the genesis of large Siberian alkaline massifs hosting major ore deposits. These reference massifs are grouped based on the predominance of alkalies (K or Na) and their agpaitic index (miaskitic and agpaitic). We proposed new emplacement schemes for the Tomtor, Murun, Burpala, Synnyr, and Bilibino massifs supported by petrochemical and geochemical data, as well as new age estimates. Types of their ore potential and genesis of rare-metal mineralization are discussed. The formational types of carbonatites as the main ore-bearing rocks are given. The depth of magma generation and types of mantle sources are determined using isotopic data from previous studies. A model of plume-related generation of ultramafic alkaline magmas is proposed.