Chemical compositions of carbonate minerals from Bayan Obo, Inner Mongolia, North China, and their petrogenetic implications

作     者：M. J. Le Bas 

作者机构：School of Ocean and Earth Science University of Southampton Southampton SO143ZH UK 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：1999年第44卷第S2期

页      面：7-8页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

主　　题：carbonate minerals dolomite carbonatite Bayan Obo. 

摘      要：THE origin of the giant Bayan Obo REE-Nb-Fe ore deposit has been under much debate since its discoveryas an iron deposit by Prof. Ding Daoheng in 1927. The main dispute is concentrated on the genesis of theore-hosted dolomite marbles of the deposit, Some authors considered them to be sedimentary in origin,while others pointed out that they could be carbonatite. However, there are very few researches concerning the compositions of carbonate minerals which may provide a direct clue to their petrogenesis. Herewe show the variations of compositions in carbonate minerals from Bayan Obo. Carbonate rocks from Bayan Obo, Inner Mongolia, could be divided into sedimentary limestone anddolostone (H8_s), coarse-grained dolomite marble (H8_c), fine-grained dolomite marble (H8_f) and carbonatite dykes (D) based on their texture, structure, mineral progenesis and occurrences. H8_s thatshows weak metamorphism and deformation is distributed to the north of the Kuangou fault, occurring