Aluminum substitution in goethite in lake ore

Bulletin of the Geological Society of Finland

关键词: goethite;    iron;    aluminum;    substitution;    unit cell;    lake ores;    Finland;   

DOI  :  10.17741/bgsf/67.1.002

来源: DOAJ

【 摘 要 】

The extent of substitution of Fe by Al in goethite in 32 lake ore samples collected from 11 lakes in Finland varied between 0 and 23 mol-%. The data indicated a negative relationship between Al-substitution and the particle size of lake ore. Differences in the Al-substitution were apparent between sampling sites, suggesting that kinetic and environmental variation in lake ore formation influences the substitution. Non-substituted goethite is formed in coarse-grained sediments with locally high concentrations of Fe due to iron-rich springs. Unit cell edge lengths and volumes of goethite varied as function of Al-subsitution but deviated from the Vegard relationship towards higher values.

【 授权许可】

Unknown