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The giant bayan obo ree-nb-fe deposit,China:Controversy and ore genesis

Geoscience Frontiers 2016年第3期7卷 335-344页

作者： Hong-Rui Fan Kui-feng Yang Fang-Fang Hu Shang Liu Kai-Yi Wang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

bayan obo ore deposit is the largest rare-earth element（ree） resource,and the second largest niobium（nb） resource in the *** to the complicated element/mineral compositions and involving several geological events,the ree enrichment mechanism and genesis of this giant deposit still remains intense *** deposit is hosted in the massive dolomite,and nearly one hundred carbonatite dykes occur in the vicinity of the *** carbonatite dykes can be divided into three types from early to late：dolomite,co-existing dolomite-calcite and calcite type,corresponding to different evolutionary stages of carbonatite magmatism based on the ree and trace element *** latter always has higher ree *** origin of the ore-hosting dolomite at bayan obo has been addressed in various models,ranging from a normal sedimentary carbonate rocks to volcano-sedimentary sequence,and a large carbonatitic *** geochemical evidences show that the coarse-grained dolomite represents a Mesoproterozoic carbonatite pluton and the fine-grained dolomite resulted from the extensive ree mineralization and modification of the coarse-grained *** ore bodies,distributed along an E-W striking belt,occur as large lenses and underwent more intense fluoritization and *** first episode mineralization is characterized by disseminated mineralization in the *** second or main-episode is banded and/or massive mineralization,cut by the third episode consisting of aegirinerich *** dating methods gave different mineralization ages at bayan obo,resulting in long and hot *** of available data suggests that the mineralization is rather variable with two peaks at～1400 and 440 *** early mineralization peak closes in time to the intrusion of the carbonatite dykes.A significant thermal event at ca.440 Ma resulted in the formation of late-stage veins with coarse crystals of ree *** involving in the ree-nb-fe mineralization at

关键词： Geochemistry Geochronology Carbonatite Dolomite bayan obo ree-nb-fe deposit

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