Criptomelana cuprífera formada durante o intemperismo das rochas da jazida de cobre do Salobo 3α, Serra dos Carajás

Autor:	M.C. Toledo-Groke, Jean-Claude Parisot, Adolpho José Melfi
Rok vydání:	1990
Předmět:	chemistry Hollandite engineering Geochemistry Mineralogy Cryptomelane chemistry.chemical_element Geology Weathering engineering.material GEOFÍSICA Copper
Zdroj:	Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP
ISSN:	0100-929X
DOI:	10.5935/0100-929x.19900004
Popis:	Geochemical and mineralogical studies of the weathering mantle over the copper mineralized rocks of Salobo 3α, Serra dos Carajas, Brazil, show that copper, released from sulfides by dissolution, accumulates in situ, and is mainly located in three mineralogical phases: silicatic, ferruginous and manganesiferous. Only the manganesiferous phase is treated here. It is a cryptomelane phase (hollandite group) with variable potassium contento Diverse methods (X-ray diffraction, infra-red spectrometry, chemical microprobe) show clearly that cryptomelane contains up to 20 % Cu0.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f86ccfff0adb28a80960b3c2570176d8 https://doi.org/10.5935/0100-929x.19900004 Zobrazit plný text záznamu