摘要
Objective Baddeleyite （ZrO~） occurs primarily as an accessory mineral in igneous rocks with low silica activity and has been widely used to determine crystallization ages of mafic- ultramafic rocks and alkaline rocks including carbonatites and kimberlites. The Bayan Obo deposit on the northern margin of the North China Craton （NCC） is the world＇s largest REE deposit. Many previous studies show that the main component of ore-hosting dolomite marble is magmatic in origin and the REE-Nb mineralization is closely related to the carbonatites in the Bayan Obo deposit. This study attempted to separate baddeleyite from the REE- Nb-rich carbonatites in the Bayan Obo deposit to determine their crystallization ages in order to better understand the timing, genesis and tectonic setting of this deposit.
Objective Baddeleyite （ZrO~） occurs primarily as an accessory mineral in igneous rocks with low silica activity and has been widely used to determine crystallization ages of mafic- ultramafic rocks and alkaline rocks including carbonatites and kimberlites. The Bayan Obo deposit on the northern margin of the North China Craton （NCC） is the world＇s largest REE deposit. Many previous studies show that the main component of ore-hosting dolomite marble is magmatic in origin and the REE-Nb mineralization is closely related to the carbonatites in the Bayan Obo deposit. This study attempted to separate baddeleyite from the REE- Nb-rich carbonatites in the Bayan Obo deposit to determine their crystallization ages in order to better understand the timing, genesis and tectonic setting of this deposit.
基金
financially supported by the National Natural Science Foundation of China(41372230,41572204)
the International Science&Technology Cooperation Program of China(grant No.2014DFR21270)
the China Geological Survey(grant No.1212011121070)
