<?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>0256-7024</journal-id>
<journal-title><![CDATA[Revista Geológica de América Central]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Geol. Amér. Central]]></abbrev-journal-title>
<issn>0256-7024</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0256-70242023000100017</article-id>
<article-id pub-id-type="doi">10.15517/rgac.2023.54081</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calidad cerámica de los suelos en la zona Chorotega, Santa Cruz y Nicoya, Guanacaste, Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Ceramic quality of the soils in the Chorotega region, Guanacaste, Santa Cruz y Nicoya, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guadamuz]]></surname>
<given-names><![CDATA[Diego A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Obando-Acuña]]></surname>
<given-names><![CDATA[Luis G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo-Maikut]]></surname>
<given-names><![CDATA[Stephanie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madrigal]]></surname>
<given-names><![CDATA[Pilar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Geólogos de Costa Rica (CGCR)  ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica (UCR) Escuela Centroamericana de Geología (ECG) ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<numero>68</numero>
<fpage>17</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0256-70242023000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0256-70242023000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0256-70242023000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La zona de estudio se ubica entre los cantones de Santa Cruz y Nicoya de Guanacaste, tiene un área geográfica de 164 km2, y un tipo de clima que varía entre tropical seco y húmedo, donde afloran rocas ígneas y sedimentarias en su superficie. La prospección geológica evaluó y analizó arcillas desde un punto de vista mecánico, edafológico y cerámico, para determinar la calidad del producto cerámico que se generará a partir de los suelos finos que se encuentran en el área de estudio. Se recolectaron 44 muestras de suelos y 30 muestras de rocas en puntos cercanos a la llanura aluvial. Los resultados obtenidos demuestran que los basaltos alterados, ricos en aluminosilicatos, y las areniscas líticas, son las principales rocas precursoras de las arcillas utilizadas en la fabricación de cerámicas por los alfareros de la región Chorotega. Además, se comprueba que los suelos del área de estudio son Vertisoles y Alfisoles los cuales son buena materia prima para generar cerámicas, debido a que contienen arcillas de la familia de la esmectita y caolinita, tipo ballclay y fireclay (Nelson, 1960). Mecánicamente presentan porosidades entre el 51 % y el 61 %, índices de plasticidad del 14 a 29, densidades mayores a 1,7 g/cm3, un contenido de finos superior al 59,9 % y que, al cocinarse a 900 °C, experimentan un encogimiento menor al 11 % y una pérdida de humedad inferior al 30 %. Por lo que, el estudio concluye que los suelos presentan las propiedades cerámicas adecuadas para poder elaborar piezas con pocos defectos cerámicos, resistentes y sin problemas para su engobe, ni para el acabado final.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The study area is located between the towns of Santa Cruz and Nicoya, Guanacaste, it is a geographic area of 164 km2 with a dry to humid tropical climate, where igneous and sedimentary rocks are exposed on the surface. Our research it is a geological prospecting, evaluated and analyzed the clays from a mechanical, edaphological and ceramic perspective to determine the quality of the ceramic products generated using the soils in the study area. A total of 44 soil samples and 30 rock samples were collected from locations near the floodplain. The results obtained show that altered basalts bearing secondary aluminosilicate minerals and silica-rich sandstones are the main precursor rocks for clays used in the manufacture of ceramics by potters from Chorotega region. It is also verified that the soils of the study area belong to the vertisoils and alfisoils taxonomy, which can generate good quality ceramic pieces, since they are ballclay and fireclay type clays (Nelson, 1960). They show porosities between 51 % and 61 %, plasticity indexes raging from 14 to 29, densities greater than 1,7 g/cm3, a content of fines greater than 59,9 %, and when cooked, they have less than 11 % shrinkage and less than 30 % moisture loss. Therefore, the study concludes that the soils have the appropriate ceramic properties to be able to produce pieces with few ceramic defects, resistant and without problems either for their slip or for the final details and decorations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[arcillas]]></kwd>
<kwd lng="es"><![CDATA[cerámica]]></kwd>
<kwd lng="es"><![CDATA[ballclay]]></kwd>
<kwd lng="es"><![CDATA[fireclay]]></kwd>
<kwd lng="es"><![CDATA[Guaitil]]></kwd>
<kwd lng="es"><![CDATA[San Vicente]]></kwd>
<kwd lng="en"><![CDATA[clays]]></kwd>
<kwd lng="en"><![CDATA[ceramic]]></kwd>
<kwd lng="en"><![CDATA[ballclay]]></kwd>
<kwd lng="en"><![CDATA[fireclay]]></kwd>
<kwd lng="en"><![CDATA[Guaitil]]></kwd>
<kwd lng="en"><![CDATA[San Vicente]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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