<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-3322</journal-id>
<journal-title><![CDATA[Boletín de la Sociedad Geológica Mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Soc. Geol. Mex]]></abbrev-journal-title>
<issn>1405-3322</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Geológica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-33222024000300003</article-id>
<article-id pub-id-type="doi">10.18268/bsgm2024v76n3a160124</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Post-magmatic sedimentation in the Paraná Basin, Brazil: paleomagnetic constraints on the age of the Cretaceous Caiuá Group]]></article-title>
<article-title xml:lang="es"><![CDATA[Sedimentación post-magmática en la cuenca del Paraná, Brasil: Aproximaciones paleomagnéticas de la edad del Grupo Caiuá, del Cretácico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ernesto]]></surname>
<given-names><![CDATA[Marcia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batezelli]]></surname>
<given-names><![CDATA[Alessandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saad]]></surname>
<given-names><![CDATA[Antonio Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caminha-Maciel]]></surname>
<given-names><![CDATA[George]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Paloma G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de São Paulo Instituto de Astronomia, Geofísica e Ciências Atmosféricas ]]></institution>
<addr-line><![CDATA[Butantã São Paulo]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Estadual de Campinas Instituto de Geociências ]]></institution>
<addr-line><![CDATA[Campinas São Paulo]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade de São Paulo Instituto de Geociências ]]></institution>
<addr-line><![CDATA[Butantã São Paulo]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal de Santa Catarina Departamento de Geologia ]]></institution>
<addr-line><![CDATA[Trindade Florianópolis]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>76</volume>
<numero>3</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222024000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222024000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222024000300003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Caiuá and Bauru Groups of Cretaceous age, represent the post-volcanic sedimentation in the Paraná Basin. Under dry conditions, extensive dunes (Draa) were formed with depocenter in the southern area. Later, under more humid conditions, the fluvial-aeolian processes reworked the dunes, forming a landscape with small dunes and river channels. The Caiuá Group comprises, in ascending stratigraphic order, the Goio Erê Formation (margins of Draa), the Rio Paraná Formation (inner Draa) and the Santo Anastácio Formation (Paleosols). Paleomagnetic results from five sections of the Caiuá Group (Rio Paraná and Santo Anastácio formations) revealed that these rocks carry remanent magnetization due primarily to magnetite and smaller contents of hematite. A paleomagnetic pole at 87.4 °S 56.6 °E (N=29, A95=6.5°, k=18) for the Caiuá Group plots close to the poles from the dyke swarms (Ponta Grossa, Florianópolis and the alkaline dykes from Paraguay) of ages 134-127 Ma, indicating that the sedimentation of the Caiuá Group was restricted to the Lower Cretaceous. Furthermore, as part of the rocks were magnetized under transitional and reversed fields, the upper age limit is probably 120 Ma, the initiation of the Cretaceous Normal Superchron, and therefore not younger than the Barremian age.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los Grupos Caiuá y Bauru del periodo Cretácico, representan la sedimentación post volcánica de la Cuenca del Paraná. En condiciones secas se formaron extensas dunas (Draa) con depocentro en la zona sur. Posteriormente, en condiciones más húmedas, los procesos fluviales-eolios re-elaboraron las dunas formando un paisaje con pequeñas dunas y cauces fluviales. El Grupo Caiuá comprende, en orden estratigráfico ascendente, la Formación Goio Eré (márgenes del Draa), la Formación Río Paraná (interior del Draa) y la Formación Santo Anastácio (Paleosoles). Los resultados paleomagnéticos de cinco secciones del Grupo Caiuá (formaciones Río Paraná y Santo Anastácio) revelaron que estas rocas tienen magnetización remanente debido principalmente a magnetita y menores contenidos de hematita. El polo paleomagnético a 87.4 °S 56.6 °E (N=29, A95=6.5°, k=18) para el Grupo Caiuá se acerca de los polos de los enjambres de diques (Ponta Grossa, Florianópolis y los diques alcalinos de Paraguay) de edades 134-127Ma, lo que indica que la sedimentación del Grupo Caiuá estuvo restringida al Cretácico Inferior. Además, como parte de las rocas fueron magnetizadas bajo campos magnéticos de transición o reversos, el límite de edad superior es probablemente 120 Ma, el inicio del Supercrono Normal del Cretácico y, por lo tanto, no es más joven que la edad Barremiana.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Caiuá Group]]></kwd>
<kwd lng="en"><![CDATA[paleomagnetism]]></kwd>
<kwd lng="en"><![CDATA[Paraná Basin]]></kwd>
<kwd lng="en"><![CDATA[Cretaceous]]></kwd>
<kwd lng="es"><![CDATA[Grupo Caiuá]]></kwd>
<kwd lng="es"><![CDATA[paleomagnetismo]]></kwd>
<kwd lng="es"><![CDATA[Cuenca del Paraná]]></kwd>
<kwd lng="es"><![CDATA[Cretácico]]></kwd>
</kwd-group>
</article-meta>
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