本文選題：錳礦床　切入點：Ga異常　出處：《地球科學(xué)》2017年09期

【摘要】：在廣西東平碳酸錳礦含錳巖系中發(fā)現(xiàn)Ga含量高異常,Ga含量為5.16×10~(-6)~82.80×10~(-6),平均含量為33.76×10~(-6),達(dá)到了Ga礦資源工業(yè)品位標(biāo)準(zhǔn)要求,但目前還未見有產(chǎn)Ga錳礦床的報道.為了提升對此富Ga現(xiàn)象的認(rèn)識,對其進行了碳、氧同位素特征研究.結(jié)果顯示:礦石和圍巖δ~(13)C_(PDB)值分別為-6.40‰~-2.20‰、-8.90‰~0.90‰,δ18 OPDB值分別為-9.00‰~-7.90‰、-9.90‰~-3.90‰.研究表明:(1)有機質(zhì)參與了碳酸錳礦形成;(2)含錳巖系為熱水沉積成因,Ga來源與海底熱液活動密切有關(guān);(3)海底熱液活動一方面為形成錳碳酸鹽直接或間接提供了大量有機質(zhì),另一方面為形成富Ga含錳巖系帶來了大量Ga,被錳的氧化物或氫氧化物、海洋生物(多為熱液微生物)所吸附、富集,經(jīng)復(fù)雜的成巖、成礦作用而最終賦存于含錳巖系之中形成富Ga含錳巖系.
[Abstract]:In the manganese bearing rock series of Dongping Manganese Carbonate Mine, Guangxi, it is found that the high Ga content and the average content of Ga are 5.16 脳 10 ~ (-10) ~ (-6) ~ 82.80 脳 10 ~ (10) ~ (-6) and 33.76 脳 10 ~ (10) ~ (-6) ~ (6), respectively, which meet the requirements of the industrial grade standard for Ga ore resources. However, there have been no reports of the Ga-producing manganese ore deposits. In order to enhance the understanding of the Ga rich phenomenon, carbon has been carried out. The results show that the values of 未 ~ (13) C _ (DBB) of ore and surrounding rock are -6.40 鈥，

本文編號：1660387