<?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>0124-8170</journal-id>
<journal-title><![CDATA[Ciencia e Ingeniería Neogranadina]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. Ing. Neogranad.]]></abbrev-journal-title>
<issn>0124-8170</issn>
<publisher>
<publisher-name><![CDATA[Universidad Militar Nueva Granada]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-81702021000100009</article-id>
<article-id pub-id-type="doi">10.18359/rcin.5071</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Paleoenvironmental Interpretation of Last Millennium Sediments in the Marriaga Swamp, Atrato Delta, Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Interpretación paleoambiental de los sedimentos del último milenio en la Ciénaga de Marriaga, Delta de Atrato, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Betancurth Montes]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cañón Barriga]]></surname>
<given-names><![CDATA[Julio Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>9</fpage>
<lpage>24</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-81702021000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-81702021000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-81702021000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: This paper presents the first paleoenvironmental reconstruction of the last 1,130 a of the Marriaga Swamp in the Atrato River delta in northwestern Colombia. The geochemical analyses of a 220 cm sediment core retrieved from the swamp reveal interesting climatic episodes and sedimentary changes in the last millennium. We split the core into three segments, according to sediment features, organic carbon content (OC), and geological ages. Records show different alternations of humid and dry periods, biological productivity, carbonate precipitation, weathering grade, and high heavy metal concentrations. The segments also concur with the geochemical differences determined by (Zr+Rb)/Sr, Ca/Ti Mn/Fe, OC/Ti, Mg/Ca Ba/Al, Sr/Al, and Ca/Al ratios. The older sequence (between 1,130 ± 90 a and 870 ± 70 a) shows a dry period with intermittent flooding events and high OC production in subareal conditions, followed by a more humid environment between 870 ± 70 a and 530 ± 40 a, with depletion of trace element ratios and OC. The more recent period (530 ± 40 a to present) evinces an environment dominated by the fluvial regime, based on a lower Ca/Al ratio and a rise of OC. The statistical correlations display three main clusters that distinguish among organic-biological productivity, bedrock source components, and heavy metal inputs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En este estudio se presenta la primera reconstrucción paleoambiental de los últimos 1130 años de la Ciénaga de Marriaga en el delta del río Atrato, en el noroeste de Colombia. Los análisis geoquímicos de un núcleo de sedimento de 220 cm recuperado en la ciénaga revelan episodios climáticos interesantes y cambios sedimentarios en el último milenio. Se dividió el núcleo en tres segmentos, según las características de los sedimentos, el contenido de carbono orgánico (CO) y las edades geológicas. Los registros muestran diferentes alternancias de períodos húmedos y secos, la productividad biológica, precipitación de carbonato, grado de meteorización y altas concentraciones de metales pesados. Los segmentos también coinciden con las diferencias geoquímicas determinadas por las relaciones (ZR+RB)/Sr, Ca/Ti Mn/Fe, CO/Ti, Mg/Ca Ba/Al, Sr/Al Ca/Al. La secuencia inferior (entre 1130 ± 90 a y 870 ± 70 a) muestra un período seco con inundaciones intermitentes y una alta producción de CO en condiciones subaéreas, seguida de un entorno más húmedo entre 870 ± 70 años y 530 ± 40 años, con agotamiento de las proporciones de oligoelementos y CO. El período más reciente (530 ± 40 a al presente) evidencia un ambiente dominado por el régimen fluvial, basado en una relación Ca/Al más baja y un aumento de CO. Las correlaciones estadísticas muestran tres grupos principales que distinguen entre la productividad biológica orgánica, los componentes de la roca madre y los aportes de metales pesados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Swamp sediments]]></kwd>
<kwd lng="en"><![CDATA[environmental reconstruction]]></kwd>
<kwd lng="en"><![CDATA[trace elements]]></kwd>
<kwd lng="en"><![CDATA[paleoclimate]]></kwd>
<kwd lng="en"><![CDATA[weathering]]></kwd>
<kwd lng="es"><![CDATA[sedimentos de ciénagas]]></kwd>
<kwd lng="es"><![CDATA[reconstrucción ambiental]]></kwd>
<kwd lng="es"><![CDATA[oligoelementos]]></kwd>
<kwd lng="es"><![CDATA[paleoclima]]></kwd>
<kwd lng="es"><![CDATA[meteorización]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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