<?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>0123-921X</journal-id>
<journal-title><![CDATA[Tecnura]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnura]]></abbrev-journal-title>
<issn>0123-921X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-921X2025000100065</article-id>
<article-id pub-id-type="doi">10.14483/22487638.21971</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Occurrence of iron ores hosted in Los Tábanos Rhyodacite of San Juan del Cesar (La Guajira), Sierra Nevada of Santa Marta massif: petrologic significance]]></article-title>
<article-title xml:lang="es"><![CDATA[Manifestaciones de minerales de hierro alojados en la Riodacita de Los Tábanos de San Juan del Cesar (La Guajira), macizo de Sierra Nevada de Santa Marta: importancia petrológica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Reyes]]></surname>
<given-names><![CDATA[Carlos Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Martínez]]></surname>
<given-names><![CDATA[Elías Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manco-Jaraba]]></surname>
<given-names><![CDATA[Dino Carmelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Fundación Universitaria del Área Andina  ]]></institution>
<addr-line><![CDATA[Valledupar ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de La Guajira  ]]></institution>
<addr-line><![CDATA[Riohacha ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>29</volume>
<numero>83</numero>
<fpage>65</fpage>
<lpage>84</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-921X2025000100065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-921X2025000100065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-921X2025000100065&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Context:  Los Tábanos Rhyodacite, located in San Juan del Cesar (La Guajira) within the Sierra Nevada de Santa Marta Massif, exhibits outcrops affected by ongoing chemical weathering processes, primarily oxidation. This alteration results in the formation of iron minerals that provide relevant information on the petrological evolution of the rock.  Objective:  To characterize the iron manifestations, evaluating their petrological significance and mineralogical phases.  Methodology: Representative samples were analyzed using complementary analytical techniques; stereomicroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), wavelength-dispersive X-ray fluorescence (WDXRF), attenuated total reflection infrared spectroscopy (ATR-IR), and Raman spectroscopy. These methods enabled the identification of mineral phases and the assessment of the mineralogical and microstructural complexity of the samples.  Results:  Mineralogical analysis revealed the presence of magnetite, hematite, quartz, and actinolite. The data indicate that iron mineral occurrences develop primarily on recently fractured surfaces, where chemical weathering is active. Overall, the samples exhibit low mineralogical and microstructural complexity.  Conclusions:  Los Tábanos Rhyodacite undergoes active oxidation process associated with the interaction of iron with oxygen and water. This process mainly produces magnetite and hematite, minerals that reflect the chemical conditions of the environment and the degree of alteration of the rock. The low mineralogical complexity observed suggests a relatively simple system of mineral transformation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Contexto: La Riodacita Los Tábanos, localizada en San Juan del Cesar (La Guajira) dentro del Macizo de la Sierra Nevada de Santa Marta, presenta afloramientos con evidencias de procesos de meteorización química en curso, principalmente de oxidación. Esta alteración involucra la formación de minerales de hierro que aportan información relevante sobre la evolución petrológica de la roca.  Objetivo: Caracterizar las manifestaciones de hierro, evaluando su significado petrológico y fases mineralogicas.  Metodología: Se analizaron muestras representativas mediante técnicas analíticas complementarias; estereomicroscopía, microscopía electrónica de barrido (SEM), difracción de rayos X (XRD), fluorescencia de rayos X de longitud de onda dispersiva (WDXRF), espectroscopía infrarroja por reflexión total atenuada (ATR-IR) y espectroscopía Raman. Estas herramientas permitieron identificar fases minerales y evaluar la complejidad mineralógica y microestructural de las muestras.  Resultados: El análisis mineralógico reveló la presencia de magnetita, hematita, cuarzo y actinolita. Las observaciones indican que las manifestaciones de minerales de hierro se desarrollan principalmente en superficies recientemente fracturadas, donde la meteorización química está activa. En general, las muestras presentan baja complejidad mineralógica y microestructural.  Conclusiones:  La Riodacita Los Tábanos experimenta un proceso de oxidación activo asociado a la interacción de hierro con oxígeno y agua. Este fenómeno genera principalmente magnetita y hematita, minerales que reflejan las condiciones químicas del ambiente y el grado de alteración de la roca. La baja complejidad mineralógica observada sugiere un sistema relativamente simple de transformación mineral.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Analytical techniques, Hematite, Iron ores]]></kwd>
<kwd lng="en"><![CDATA[Magnetite]]></kwd>
<kwd lng="en"><![CDATA[Los Tabanos Rhyodacite]]></kwd>
<kwd lng="es"><![CDATA[Hematita]]></kwd>
<kwd lng="es"><![CDATA[Magnetita]]></kwd>
<kwd lng="es"><![CDATA[Menas de hierro]]></kwd>
<kwd lng="es"><![CDATA[Riodacita de Los Tábanos]]></kwd>
<kwd lng="es"><![CDATA[Técnicas analíticas]]></kwd>
</kwd-group>
</article-meta>
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