摘要
本文研究了黑水锰矿红帘石的产出特征、矿物学特征和化学特征,并对红帘石的成因进行了探讨,从这些研究中得出以下结论: (1) 本区红帘石有两种类型:普通红帘石和高铁红帘石,这是红帘石化学成分变异的结果。 (2) 由于红帘石的内部晶体结构和阳离子(如Fe^(3+)、Mn^(3+)离子替换Al)的不同占位,便引起红帘石化学成分的变异。 (3) 本区红帘石主要是经过区域变质,在氧逸度高的环境中,粘土矿物与锰碳酸盐矿物之间发生化学反应形成的,少数是在水热变质作用中形成的。
Mineralogy, chemistry and occurrence of piementite have been studied. Its genesis has also been discussed.
1. As a result of chemical variation, the Heishui piementite has two varieties, i.e. common piementite and iron-rich piementite.
2. Chemical variation is caused by substitution of Fe^(3+) and Mn^(3+) for Al within the piementite crystal structure,
3. Piementite in this area was formed mainly through a regional metamorphism when clay minerals reacted with manganese carbonates in a high oxygen fugacity environment. In a few occasions piementite also formed in hydro-thermal processes.
出处
《矿物岩石》
CAS
CSCD
1989年第2期60-64,共5页
Mineralogy and Petrology
