AMS and grain shape fabric of the Late Palaeozoic diamictites of the Southeastern Paran Basin, Brazil

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dc.contributor.authorArchanjo, C. J.
dc.contributor.authorSilva, M. G.
dc.contributor.authorCastro, J. C.
dc.contributor.authorLauneau, P.
dc.contributor.authorTrindade, RIF
dc.contributor.authorMacedo, JWP
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Nantes
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)
dc.date.accessioned2014-05-20T15:30:14Z
dc.date.available2014-05-20T15:30:14Z
dc.date.issued2006-01-01
dc.description.abstractDiamictites interbedded with marine shales and turbidites onlap the eastern border of the Parana Basin (Southern Brazil). These poorly sorted sediments were deposited during the Permo-Carboniferous glaciation, and their matrix-supported clasts show no preferred orientation. These massive rocks have been studied using anisotropy of magnetic susceptibility (AMS) and grain shape fabric. Hysteresis loops and thermomagnetic measurements show that AMS depends mostly on the paramagnetic clays, but fine ferromagnetic particles also contribute to the anisotropy. The coarse silt to sand grain preferred orientation study supports the use of AMS in describing the diamictite fabric, at least regarding the orientation of the foliation. AMS and grain shape data reveal subhorizontal to weakly inclined magnetic and grain shape foliation parallel to the regional bedding. The magnetic lineations are normally scattered within the foliation plane in agreement with the oblate AMS ellipsoids found in these rocks. Both fabric patterns are consistent with deposition by subaqueous mudflows that were resedimented downslope, with elastic supply from continental sources. The off-vertical grain shape foliation poles suggest that the deposition of diamictites was controlled by the depocentre topography of the Rio do Sul sub-basin.en
dc.description.affiliationUSP, Inst Geociencias, BR-05508080 São Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Geociencias, BR-13506900 Rio Claro, Brazil
dc.description.affiliationUniv Nantes, Lab Planetol & Geodynam, F-44322 Nantes, France
dc.description.affiliationUniv São Paulo, Inst Astron Geofis & Ciências Amosfericas, BR-05508900 São Paulo, Brazil
dc.description.affiliationUniv Fed Rio Grande Norte, DFTE, BR-59078970 Natal, RN, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Geociencias, BR-13506900 Rio Claro, Brazil
dc.format.extent95-106
dc.identifierhttp://dx.doi.org/10.1144/0016-764904-155
dc.identifier.citationJournal of the Geological Society. Bath: Geological Soc Publ House, v. 163, p. 95-106, 2006.
dc.identifier.doi10.1144/0016-764904-155
dc.identifier.issn0016-7649
dc.identifier.urihttp://hdl.handle.net/11449/39659
dc.identifier.wosWOS:000234308300009
dc.language.isoeng
dc.publisherGeological Soc Publ House
dc.relation.ispartofJournal of the Geological Society
dc.relation.ispartofjcr2.683
dc.relation.ispartofsjr1,567
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleAMS and grain shape fabric of the Late Palaeozoic diamictites of the Southeastern Paran Basin, Brazilen
dc.typeArtigo
dcterms.licensehttp://www.geolsoc.org.uk/lcterms
dcterms.rightsHolderGeological Soc Publ House
unesp.author.orcid0000-0003-4618-7790[1]
unesp.author.orcid0000-0001-9848-9550[5]

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