Alteration of pyrophanite: transition in chemical composition to a manganese analogue of pseudorutile - evidence from the Quadrilatero Ferrifero of Minas Gerais, Brazil

被引：1
|
作者：
Cabral, AR [1 ]
Sattler, CD [1 ]
机构：
[1] Tech Univ Clausthal, Inst Geol & Palaontol, D-38678 Clausthal Zellerfeld, Germany
来源：
NEUES JAHRBUCH FUR MINERALOGIE-MONATSHEFTE | 2004年 / 03期
关键词：
pyrophanite alteration; Mn-rich pseudorutile-like mineral; Conta Historia deposit; Quadrilatero Ferrifero; Minas Gerais; Brazil;
D O I：
10.1127/0028-3649/2004/2004-0097
中图分类号：
P57 [矿物学];
学科分类号：
070901 ;
摘要：
Alteration of Fe-bearing pyrophanite from a manganese oxide deposit (Conta Historia) in the Quadrilatero Ferrifero of Minas Gerais, Brazil, was investigated by electron-microprobe analysis. The microanalyses suggest that the alteration products range in composition from Mn-deficient pyrophanite to a hypothetical Mn-rich pseudorutile-like mineral. In the sample material analysed, crystals of Fe-bearing pyrophanite cut by gibbsite-filled veinlets and vugs are altered, whereas Mn-rich ilmenite from gibbsite pseudomorphs after garnet remains unaltered.
引用
收藏
页码：97 / 103
页数：7
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