<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742019000200159</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2019.2.1054</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Weathering and biodégradation of hydrothermal petroleum in the north rift of Guaymas Basin, Gulf of California]]></article-title>
<article-title xml:lang="es"><![CDATA[Meteorización y Biodegradación de Petróleo Hidrotermal de la Brecha Norte de la Cuenca de Guaymas del Golfo de California]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simoneit]]></surname>
<given-names><![CDATA[Bernd R.T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oros]]></surname>
<given-names><![CDATA[Daniel R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leif]]></surname>
<given-names><![CDATA[Roald N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medeiros]]></surname>
<given-names><![CDATA[Patricia M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Oregon State University College of Science Department of Chemistry]]></institution>
<addr-line><![CDATA[Corvallis OR]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Richmond  ]]></institution>
<addr-line><![CDATA[Richmond CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Lawrence Livermore National Laboratory  ]]></institution>
<addr-line><![CDATA[Livermore CA]]></addr-line>
<country>U.S.A.</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Georgia Department of Marine Sciences ]]></institution>
<addr-line><![CDATA[Athens GA]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>36</volume>
<numero>2</numero>
<fpage>159</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742019000200159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742019000200159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742019000200159&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Guaymas Basin, Gulf of California, is an actively spreading ocean basin, part of the system of spreading axes and transform faults extending from the East Pacific Rise to the San Andreas fault. Upward migration of hydrothermal petroleum in the basin rifts occurs by both bulk transport and high temperature/pressure aqueous and supercritical gaseous (e.g. CO2, CH4) fluid phases into the seabed sediments. The resulting mounds are laden with the youngest hydrothermal petroleum known to date. The north rift hydrothermal system has been dormant for ~ 3000 years, and organic geochemical analyses of sediment samples collected by both piston and push corers and by dredging operations from various cruises to the Gulf of California show that the organic matter is composed primarily of autochthonous lipids from marine biota, overprinted by hydrothermal petroleum. The chemical composition of this petroleum indicates severe biodegradation for exposed samples, based on the contents of aliphatic, aromatic, steroid, and hopanoid biomarkers. Sulfurized lipids are enriched in the biodegraded oils. Both hydrothermal minerals and petroleum in the mounds of the north rift seabed have been weathered by oxidative/microbial processes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La cuenca oceánica de Guaymas del Golfo de California es una cuenca de extensión activa que pertenece al sistema de ejes y fallas transformantes que se extiende desde la dorsal Este del Pacifico hasta la Falla de San Andrés. En ella se produce la migración ascendente del petróleo hidrotermal hacia los sedimentos más superficiales del fondo marino a través de las brechas de la cuenca impulsado por fases fluidas de agua a temperatura y presión altas, así como gases en condiciones supercríticas (ej. CO2, CH4). Los montículos formados resultantes contienen el petróleo hidrotermal más joven que se conoce hasta el momento. El sistema hidrotermal de la brecha norte ha estado inactivo en los últimos ~3,000 años. Los análisis orgánico-geoquímicos de sedimento recogido mediante testigos manuales, de pistón y operaciones de dragado en el Golfo de California muestran que el material orgánico está compuesto principalmente de lípidos característicos de la biota marina sobrecargada con petróleo hidrotermal. Los biomarcadores alifáticos, aromáticos, esteroides y hopanoides presentes en el petróleo indican una degradación severa de las muestras expuestas a los procesos de meteorización. Dicho petróleo biodegradado está enriquecido en lípidos que contienen compuestos de azufre. En resumen, los procesos oxidativos y microbianos han meteorizado tanto los minerales hidrotermales como petróleo de los montículos de las brechas del lecho marino norte.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[hydrothermal petroleum]]></kwd>
<kwd lng="en"><![CDATA[weathering]]></kwd>
<kwd lng="en"><![CDATA[biodegradation]]></kwd>
<kwd lng="en"><![CDATA[north rift]]></kwd>
<kwd lng="en"><![CDATA[Guaymas Basin]]></kwd>
<kwd lng="es"><![CDATA[Petróleo hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[Meteorización]]></kwd>
<kwd lng="es"><![CDATA[Biodegradación]]></kwd>
<kwd lng="es"><![CDATA[Brecha norte]]></kwd>
<kwd lng="es"><![CDATA[Cuenca de Guaymas]]></kwd>
</kwd-group>
</article-meta>
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