{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T08:07:28Z","timestamp":1775981248198,"version":"3.50.1"},"reference-count":55,"publisher":"American Geophysical Union (AGU)","issue":"B6","license":[{"start":{"date-parts":[[2006,6,16]],"date-time":"2006-06-16T00:00:00Z","timestamp":1150416000000},"content-version":"vor","delay-in-days":15,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Geophys. Res."],"published-print":{"date-parts":[[2006,6]]},"abstract":"<jats:p>Neoproterozoic carbonates of the Araras Group exhibit two distinct magnetic components across the same carbonate succession in a cross\u2010section between the Amazon craton and the Paraguay fold belt. Pink dolostones of the Mirassol d'Oeste Formation carry a dual polarity, primary component, whereas black bituminous limestones of the Guia Formation yield a secondary postfolding component. Magnetic signatures of the Guia limestones, such as high anhysteretic remanence magnetization\/saturation isothermal remanence magnetization ratios, high\u2010frequency\u2010dependent magnetic susceptibility and contradictory Lowrie\u2010Fuller and Cisowski tests, are typical of remagnetized carbonates. Unblocking temperatures suggest that the stable high\u2010temperature remanence is carried by both pyrrhotite and magnetite for which an authigenic origin is suggested by scanning electron microscope observations. The different magnetic properties noted between dolostones with or without bitumen and between dolostones and limestones in the same metamorphic conditions lead to the hypothesis that the amount of hydrocarbon as well as the lithology influence nucleation of authigenic magnetic minerals in these rocks. Presence of magnetite pseudoframboids and euhedral iron sulphide crystals occurring in fracture and voids are in favor of a chemical remanence (CRM). The presence of pyrrhotite as one of the main carriers of CRM in these rocks, and its association with bitumen in fractures is probably related to an epigenetic enrichment of sulfur due to hydrocarbon seepage. However, hydrocarbon maturation solely could not explain the differences of the magnetic mineralogy observed in the craton and the fold belt. Enhanced magnetite formation in the thrust and fold belt is interpreted to be the result of higher temperatures leading to stronger diagenesis of clay minerals.<\/jats:p>","DOI":"10.1029\/2005jb004106","type":"journal-article","created":{"date-parts":[[2006,6,15]],"date-time":"2006-06-15T19:39:48Z","timestamp":1150400388000},"source":"Crossref","is-referenced-by-count":31,"title":["Remagnetization in bituminous limestones of the Neoproterozoic Araras Group (Amazon craton): Hydrocarbon maturation, burial diagenesis, or both?"],"prefix":"10.1029","volume":"111","author":[{"given":"E.","family":"Font","sequence":"first","affiliation":[{"name":"Departamento de Geof\u00edsica, Instituto de Astronomia, Geof\u00edsica e Ci\u00eancias Atmosf\u00e9ricas Universidade de S\u00e3o Paulo  S\u00e3o Paulo Brazil"},{"name":"Laboratoire des M\u00e9canismes et Transferts en G\u00e9ologie, UMR 5563, Observatoire Midi\u2010Pyrenees Universit\u00e9 Paul\u2010Sabatier  Toulouse France"}]},{"given":"R. I. F.","family":"Trindade","sequence":"additional","affiliation":[{"name":"Departamento de Geof\u00edsica, Instituto de Astronomia, Geof\u00edsica e Ci\u00eancias Atmosf\u00e9ricas Universidade de S\u00e3o Paulo  S\u00e3o Paulo Brazil"}]},{"given":"A.","family":"N\u00e9d\u00e9lec","sequence":"additional","affiliation":[{"name":"Laboratoire des M\u00e9canismes et Transferts en G\u00e9ologie, UMR 5563, Observatoire Midi\u2010Pyrenees Universit\u00e9 Paul\u2010Sabatier  Toulouse France"}]}],"member":"13","published-online":{"date-parts":[[2006,6,16]]},"reference":[{"key":"e_1_2_10_2_1","unstructured":"Alvarenga C. J. S.(1990) Ph\u00e9nom\u00e8nes s\u00e9dimentaires structuraux et circulation de fluides d\u00e9velopp\u00e9s \u00e0 la transition cha\u0131circ;ne\u2010craton. Exemple de la cha\u00eene Paraguay d'\u00e2ge prot\u00e9rozo\u00efque sup\u00e9rieur Mato Grosso Br\u00e9sil th\u00e8se doct 177 pp. Univ. 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