钠离子对于海洋成因10-水锰矿结构稳定性的影响  

Role of Sodium Ion on Stability of the Crystal Structure of Marine 10-Manganates

作　　者：姜学钧[1,2] 姚德[3,4] 林学辉[1,2] 

机构地区：[1]国土资源部海洋油气资源与海洋环境重点实验室,山东青岛266071 [2]中国地质调查局青岛海洋地质研究所,山东青岛266071 [3]山东理工大学资源与环境学院,山东淄博255049 [4]中国科学院海洋研究所,山东青岛266071

出　　处：《地球科学（中国地质大学学报）》2009年第3期392-398,共7页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目(No.40076015);中国大洋协会项目(No.DY105-01-03-03)

摘　　要：10-水锰矿是海洋成岩型铁锰结核和很多陆生锰矿的主要矿物,铜、镍等过渡金属元素对于10-水锰矿结构的稳定起着重要的作用,而对于碱金属元素钠离子在其中的地球化学行为则少有涉及.利用取自东太平洋海底的成岩型铁锰结核,借助化学方法,利用矿物学和晶体化学的理论对碱金属元素钠离子在成岩型铁锰结核中的存在状态以及对结核组成矿物10-水锰矿结构的影响进行了研究.结果显示,10-水锰矿中钠离子可以被弱酸析出并且会导致其结构的破坏,使得10-水锰矿转换成7-水锰矿;析出钠离子并且结晶状态变差的10-水锰矿吸附钠离子后,其结晶状态可明显好转并且部分非10相转化为10-水锰矿,但是这种结构的破坏在自然条件下不能完全恢复.因此,钠离子对于10-水锰矿结构的稳定性起着非常重要的作用.The 10A-manganate is main mineral component of the marine diagenetic nodule and terraneous manganese. The previous study has poved that the transition metals--copper, nickel paly an improtant role in the stability of 10A-manganates. However, the geochemical behavior of sodiurn ions is seldom invovled in the previous researches. The role of sodium ions on the stability of 10A- manganates was investigated in terms of the selective dissolution experiments and adsorption experiments as well as crystal chemistry and mineralogy by using the marine diagenetic nodule recovered near the equatorial East Pacific. Sodium ions in 10A-manganates can be extracted by weak acidic and 10A-manganates transform into 7A-manganates. On the other hand, crystallinity of the samples whose sodium ions were extracted turned better and some non-10A-rnanganates phases turned into 10A-manganates through the uptake of sodium. The destructive structure of 10A-manganates can＇t recover thoroughly from the uptake of sodium ions under natural conditions. Sodium ions play an important role in the stability of 10A-manganates of marine diagenetic nodule.

关 键 词：海洋成岩型结核 10A-水锰矿 钠离子 晶体结构 稳定性 

分 类 号：P591[天文地球—地球化学] P618[天文地球—地质学]