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Coexistence of halloysite and kaolinite: a study on the genesis of kaolin clays of Campo Alegre Basin, Santa Catarina State, Brazil

De Oliveira, Marisa T G; Furtado, Sandra M A; Formoso, Milton L L; Eggleton, Richard A; Norberto, Dani

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Kaolin at Campo Alegre Basin, Santa Catarina State, Brazilwas formed from alteration of volcanic acid rocks. Halloysite clays dominate the clay fraction of the matrix of the kaolin body, whereas a poorly crystalline kaolinite is abundant in veins. Some primary blocky structures have high amounts of illite, in one mine, but in general, only low contents of illite-smectite, illite, chlorite-vermiculite, vermiculite and quartz were identified in the clay fraction of the samples. Toward the top...[Show more]

dc.contributor.authorDe Oliveira, Marisa T G
dc.contributor.authorFurtado, Sandra M A
dc.contributor.authorFormoso, Milton L L
dc.contributor.authorEggleton, Richard A
dc.contributor.authorNorberto, Dani
dc.date.accessioned2009-04-16T03:14:16Z
dc.date.accessioned2010-12-20T06:04:44Z
dc.date.available2009-04-16T03:14:16Z
dc.date.available2010-12-20T06:04:44Z
dc.identifier.citationAnais da Academia Brasileira de Ciencias 79.4 (2007): 665-681
dc.identifier.issn0001-3765
dc.identifier.urihttp://hdl.handle.net/10440/38
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/10440/38
dc.description.abstractKaolin at Campo Alegre Basin, Santa Catarina State, Brazilwas formed from alteration of volcanic acid rocks. Halloysite clays dominate the clay fraction of the matrix of the kaolin body, whereas a poorly crystalline kaolinite is abundant in veins. Some primary blocky structures have high amounts of illite, in one mine, but in general, only low contents of illite-smectite, illite, chlorite-vermiculite, vermiculite and quartz were identified in the clay fraction of the samples. Toward the top of the mines, hematite and lepidocrocite appear in horizontal red and ochre colored levels and the amount of kaolinite increases compared to halloysite. The vertical zoning of alteration levels, the changes in mineralogy, the positive correlation between depth and Cation Exchange Capacity of the clays, the preservation of different types of rock textures in the kaolin bodies, the dominant tube morphology of the halloysite clays indicate a supergene genesis for the deposits. Criteria to distinguish between supergene and hypogene kaolin are discussed. Transmission Electron Microscopy of the cross sections of halloysite tubes showed polygonal forms that are ascribed to be transitional between kaolinite and halloysite. It is proposed that some of the kaolinite of these deposits be inherited from the dehydration of halloysite tubes.
dc.format17 pages
dc.publisherAcademia Brasileira de Ciencias
dc.rightshttp://www.scielo.br/scielo.php?pid=0001-3765&script=sci_serial "All the content of the journal, except where otherwise noted, is licensed under a Creative Commons License" - from journal web site (as at 17/02/10)
dc.sourceAnais da Academia Brasileira de Ciencias
dc.source.urihttp://www.scielo.br/pdf/aabc/v79n4/a08v79n4.pdf
dc.source.urihttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400008&lng=en&nrm=iso&tlng=en
dc.subjectkaolinite
dc.subjecthalloysite
dc.subjecthalloysite morphology
dc.subjectkaolin
dc.subjectweathering
dc.subjectclay genesis
dc.titleCoexistence of halloysite and kaolinite: a study on the genesis of kaolin clays of Campo Alegre Basin, Santa Catarina State, Brazil
dc.typeJournal article
local.description.notesSEO code: 970104
local.identifier.citationvolume79
dcterms.dateAccepted2006-09-10
dc.date.issued2007
local.identifier.absfor040201
local.identifier.ariespublicationu3379551xPUB166
local.type.statusPublished Version
local.contributor.affiliationDe Oliveira, Marisa T G, Universidade Federal do Rio Grande do Sul
local.contributor.affiliationFurtado, Sandra M A, Universidade Federal de Santa Catarina
local.contributor.affiliationFormoso, Milton L L, Universidade Federal do Rio Grande do Sul
local.contributor.affiliationEggleton, Richard A, Research School of Earth Sciences, Department of Earth and Marine Sciences
local.contributor.affiliationNorberto, Dani, Universidade Federal do Rio Grande do Sul
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage665
local.bibliographicCitation.lastpage681
local.identifier.doi10.1590/S0001-37652007000400008
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2015-12-09T07:22:53Z
local.identifier.scopusID2-s2.0-37048998756
CollectionsANU Research Publications

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