Zobrazeno 1 - 10 of 23 pro vyhledávání: '"Ida Valeton"'
1
Element concentration and formation of ore deposits by weathering
Autor: Ida Valeton
Publikováno v: CATENA. 21:99-129
Most important supergene ore or mineral deposits are those of Al, Fe, Mn, Cu, Ni, Co, and residual minerals: Au, PGE, REE, Nb, W, Sn, Cr, Ti-minerals, phosphates, diamond. During earth history, directed trends of weathering are observed which depend
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4d430844969ec9fad9393473d0b9e525
https://doi.org/10.1016/0341-8162(94)90006-x
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2
Bauxites and associated terrestrial sediments in Nigeria and their position in the Bauxite belts of Africa
Autor: Ida Valeton
Publikováno v: Journal of African Earth Sciences (and the Middle East). 12:297-310
The African surface, Lower Tertiary in age, its special ferralitic weathering mantle and reworking products (LDF) are discussed. Dominant facts are: 1. 1. Not only bauxitisation but also supergene ore formation of manganese, iron, nickel, gold, gossa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::75c18f7fc8c9419e9501aa8ee0a36935
https://doi.org/10.1016/0899-5362(91)90078-d
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3
Polygenetic lateritic iron ores on BIF's in Minas Gerais/Brazil
Autor: Ida Valeton, J. Weggen
Publikováno v: Geologische Rundschau. 79:301-318
The aim of this paper was a mineralogical-geochemical investigation of the weathering processes in the BIF's (banded iron formation) of the Ferteco area, M.G. Brazil. A several hundred meter deep Proterozoic supergene alteration is overprinted by you
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::73952ca49481f34743fe687940c52d63
https://doi.org/10.1007/bf01830627
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7
Geochemistry and mineralogy of the Lower Tertiary in situ laterites on the Jos Plateau, Nigeria
Autor: Hubert Beißner, Ida Valeton
Publikováno v: Journal of African Earth Sciences (1983). 5:535-550
A geochemical investigation was initated on 24 samples from four different weathering profiles—inselbergs—of the Jos Plateau, Nigeria. Results are presented on field-occurrence, macro- and micro-textures, normative mineralogical composition, kaol
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a7b2a0ed7a2aed24491fa8ed0b74dc68
https://doi.org/10.1016/0899-5362(86)90063-1
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9
Distribution pattern of bauxites in Cataguases area (SE-Brazil), in relation to Lower Tertiary paleogeography and younger tectonics. Schéma de répartition des bauxites dans la région de Cataguases, SE du Brésil, en relation avec la paléogéographie et la tectonique récente au Tertiaire inférieur
Autor: Ida Valeton, Adolpho José Melfio
Publikováno v: Sciences Géologiques. Bulletin. 41:85-98
The results of detailed field and laboratory work of our research group, based on contributions of H. Beissner, U. Kehlenbeck, P. Lemke and R. Reche, are the following. In the area of Cataguases, M.G./Brazil, a NNE-SSW running bauxite belt was formed
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f733df81c6938b8d8c905d26edb9b85
https://doi.org/10.3406/sgeol.1988.1783
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