摘要
本文研究了沉积碳酸盐型锰矿中菱锰矿的组成,阐明了Mn、Ca、Mg、Fe四种主要组分的频率分布特点。根据Q型聚类分析结果,将菱锰矿分成四个亚类。对比产于不同建造中菱锰矿的成分后,认为MgCO_3/CaCO_3具有成因标志意义:碎屑岩-泥质岩组合中的菱锰矿MgCO_3/CaCO_3=0.7—1.8,碳酸盐建造和火山沉积建造中的菱锰矿,这一比值分别为0—0.625和1.2—4.8。
Studied in this paper is the composition of rhodochrosites occurring in main sedimentary-carbonate-type manganese ores in China.Frequency distribution curves of the basic components (Mn, Ca, Mg, Fe) are described as well. Qmode point group hierarchical analyses permit us to divide the rhodochrosites into four groups. Comparing the compositions of rhodochrosites in various formations, we can see that the ratios of MgCO_3/CaCO_3 in rhodochrosites from the detrital rock-argillite formation are in the range 0.7—1.8, and those from carbonate and volcano-sedimentary formations vary between 0 and 0.625 and between 1.2 and 4.8, respectively.
出处
《矿物学报》
CAS
CSCD
北大核心
1991年第1期13-20,共8页
Acta Mineralogica Sinica
