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
相关论文
共 34 条
  • [21] Chemical composition of bovine milk from Minas Gerais State, Brazil
    Luís Gustavo Cofani dos Santos
    Elisabete A. De Nadai Fernandes
    Márcio Arruda Bacchi
    Gabriel Adrián Sarriés
    Lucimara Blumer
    Fernando Barbosa Júnior
    Journal of Radioanalytical and Nuclear Chemistry, 2009, 282 : 493 - 496
  • [22] Mercury-bearing manganiferous veinlets in compact haematite ore: the preliminary data from Fabrica deposit, Quadrilatero Ferrifero, Minas Gerais, Brazil
    Cabral, A.
    Correa Neto, A.
    TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION B-APPLIED EARTH SCIENCE, 2006, 115 (01): : 1 - 7
  • [23] Spessartine-tourtnaline-bearing manganiferous itabirite at Miguel Congo: petrographic evidence for a Mn-rich metaexhalite in the Quadrilatero Ferrifero of Minas Gerais, Brazil
    Cabral, AR
    TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION B-APPLIED EARTH SCIENCE, 2003, 112 (03): : B313 - B318
  • [24] Palladian gold and palladium arsenide-antimonide minerals from Gongo Soco iron ore mine, Quadrilatero Ferrifero, Minas Gerais, Brazil
    Cabral, AR
    Lehmann, B
    Kwitko, R
    Jones, RD
    TRANSACTIONS OF THE INSTITUTION OF MINING AND METALLURGY SECTION B-APPLIED EARTH SCIENCE, 2002, 111 : B74 - B80
  • [25] Gold-tourmaline assemblage in a Witwatersrand-like gold deposit, Ouro Fino, Quadrilatero Ferrifero of Minas Gerais, Brazil: the composition of gold and metallogenic implications
    Koglin, Nikola
    Cabral, Alexandre Raphael
    Brunetto, Wilson Jose
    Vymazalova, Anna
    NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN, 2012, 189 (03): : 263 - 273
  • [26] Hg-Tl-bearing manganese oxide from Conta História manganese deposit, Quadrilátero Ferrifero, Minas Gerais, Brazil
    Cabral, A.R.
    Lehmann, B.
    Sattler, C.D.
    Pires, F.R.M.
    Kaneko, K.
    Transactions of the Institutions of Mining and Metallurgy, Section B: Applied Earth Science, 2002, 111 (MAY/AUGUST):
  • [27] Dating the Itabira iron formation, Quadrilatero Ferrifero of Minas Gerais, Brazil, at 2.65 Ga: Depositional U-Pb age of zircon from a metavolcanic layer
    Cabral, Alexandre Raphael
    Zeh, Armin
    Koglin, Nikola
    Seabra Gomes, Antonio Augusto, Jr.
    Viana, Deiwys Jose
    Lehmann, Bernd
    PRECAMBRIAN RESEARCH, 2012, 204 : 40 - 45
  • [28] Earthquake-induced clastic dyke and fluid inflow at the Miguel Burnier manganese-ore deposit, Quadrilatero Ferrifero of Minas Gerais, Brazil (vol 3, 342, 2021)
    DeFerreira, Tiago Henrique
    Cabral, Alexandre Raphael
    Rios, Francisco Javier
    SN APPLIED SCIENCES, 2021, 3 (05):
  • [29] Palladseite and its oxidation: evidence from Au-Pd vein-type mineralization (jacutinga), Caue iron-ore mine, Quadrilatero Ferrifero, Minas Gerais, Brazil
    Cabral, AR
    Lehmann, B
    Kwitko, R
    Galbiatti, HF
    Pereira, MC
    MINERALOGICAL MAGAZINE, 2002, 66 (02) : 327 - 336
  • [30] Denudation rates of the Quadrilatero Ferrifero (Minas Gerais, Brazil):: Preliminary results from measurements of solute fluxes in rivers and in situ-produced cosmogenic 10Be
    Salgado, AAR
    Braucher, R
    Colin, F
    Nalini, HA
    Varajao, AFDC
    Varajao, CAC
    JOURNAL OF GEOCHEMICAL EXPLORATION, 2006, 88 (1-3) : 313 - 317
1234