 | Montes, Célia R., Melfi, Adolpho J., Carvalho, Adilson, Vieira-Coelho, Antonio C., Formoso, Milton L. L. (2002) Genesis, mineralogy and geochemistry of kaolin deposits of the Jari River, Amapá State, Brazil. Clays and Clay Minerals, 50 (4) 494-503 doi:10.1346/000986002320514217 | Journal (article/letter/editorial) | | GEOCHEMISTRY OF KAOLIN DEPOSITS OF THE JARI RIVER, AMAPÁ STATE, BRAZIL C ÉLI A R. M ONTES 1 , A DOL PH O...13418-900, Piracicaba, SP, Brazil 2 Departamento de Geologia Sedimentar e Ambiental do Instituto de Geociências/NUPEGEL...Geociências/NUPEGEL, USP, Rua do Lago, 562, 05508-900, São Paulo, SP, Brazil 3 Departamento de Qu‡´mica Industrial/...Lineu Prestes, 580, 05508-900, São Paulo, SP, Brazil 4 Centro de Estudo em Petrologia e Geoqu‡´mica...Federal do Rio Grande do Sul, Avenida Bento Gonc°alves, 9.500, 94501-970, Porto Alegre, RS, Brazil Abstract—Kaolin |  | | Journal (article/letter/editorial) | | Abstract The kaolin deposits of the Amazon region of Brazil are of lateritic origin, modi®ed by subsequent...rocks from the Cretaceous period (Itapecuru and Alter do ChaÄo), but also include metamorphic and felsic volcanic...kaolinite, quartz, sometimes illite-muscovite, anatase and hematite. In certain locations, crandallite-goyazite...Universidade Federal do Para Av. Augusto Correa 1, 66.075-110 BeleÂm-PA, Brazil Tel. +55(091) 2495028...(15%) and Brazil (11%). In 1992 the world production reached 23 million tons, with Brazil producing about |  | | Journal (article/letter/editorial) | | Mn-Al-P duricrusts located in southwestern Amazonia (Brazil). The samples were collected at different elevations...evolution of Proterozoic and Paleozoic terrains in Brazil. Three main phases of duricrust formation were...from western Africa, India, China, Australia and Brazil suggests well demarcated na lateritization pulses...(6-13°S and 59-62°W), about 500 km south of Manaus, Brazil (Fig. 1). na Major geological terrains comprise...kaolinite as the main minerals, and minor quartz and anatase and rutile (Fig. 3A and 4). Friable pisolites of |
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