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在广西东平碳酸锰矿含锰岩系中发现Ga含量高异常,Ga含量为5.16×10~(-6)~82.80×10~(-6),平均含量为33.76×10~(-6),达到了Ga矿资源工业品位标准要求,但目前还未见有产Ga锰矿床的报道.为了提升对此富Ga现象的认识,对其进行了碳、氧同位素特征研究.结果显示:矿石和围岩δ~(13)C_(PDB)值分别为-6.40‰~-2.20‰、-8.90‰~0.90‰,δ18 OPDB值分别为-9.00‰~-7.90‰、-9.90‰~-3.90‰.研究表明:(1)有机质参与了碳酸锰矿形成;(2)含锰岩系为热水沉积成因,Ga来源与海底热液活动密切有关;(3)海底热液活动一方面为形成锰碳酸盐直接或间接提供了大量有机质,另一方面为形成富Ga含锰岩系带来了大量Ga,被锰的氧化物或氢氧化物、海洋生物(多为热液微生物)所吸附、富集,经复杂的成岩、成矿作用而最终赋存于含锰岩系之中形成富Ga含锰岩系.
Ga content was found to be high in 5.16 × 10 ~ (-6) ~ 82.80 × 10 ~ (-6) Ga and 33.76 × 10 ~ (-6) Ga in Manganese series of Dongping carbonate manganese ore deposit in Guangxi Province, However, up to now, no Ga-bearing manganese ore deposit has been reported.In order to improve understanding of this Ga-rich phenomenon, carbon and oxygen isotopic characteristics were studied.The results show that ore and surrounding rock The δ ~ (13) C_ (PDB) values were -6.40 ‰ ~ -2.20 ‰ and-8.90 ‰ ~ 0.90 ‰ respectively, and the δ18 OPDB values were -9.00 ‰ -7.90 ‰ and -9.90 ‰ -3.90 ‰, respectively (1) the organic matter participates in the formation of manganese carbonate ore; (2) the manganese-bearing rock is the cause of hydrothermal sedimentation, and the source of Ga is closely related to the hydrothermal activity of the seafloor; (3) the seabed hydrothermal activity, on the one hand, Or indirectly provide a large number of organic matter, on the other hand to form Ga-rich manganese-bearing rock series brought a lot of Ga, manganese oxides or hydroxides, marine organisms (mostly hydrothermal microorganisms) adsorption, enrichment, Complicated diagenesis and metallogenesis, and ultimately occur in the manganese-bearing rock series to form Ga-rich manganese-bearing rock series.