<?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>S1405-33222017000100209</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Recent carbonatitic magmatism in Angola: the dykes of the Chiva lagoon maar]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campeny]]></surname>
<given-names><![CDATA[Marc]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Melgarejo]]></surname>
<given-names><![CDATA[Joan C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mangas]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manuel]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[Antonio O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Museu de Ciències Naturals de Barcelona Departament de Mineralogia ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universitat de Barcelona Departament de Mineralogia, Petrologia i Geologia Aplicada ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Las Palmas de Gran Canaria Instituto de Oceanografía y Cambio Global ]]></institution>
<addr-line><![CDATA[Las Palmas de Gran Canaria ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Agostinho Neto Departamento de Geologia ]]></institution>
<addr-line><![CDATA[Luanda ]]></addr-line>
<country>Angola</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>69</volume>
<numero>1</numero>
<fpage>209</fpage>
<lpage>222</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-33222017000100209&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-33222017000100209&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-33222017000100209&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Chiva is a circular lagoon with a diameter of 900 m, located in the vicinity of the Catanda graben (Angola). This area is largely covered by Quaternary lacustrine sediments, however, a few dykes of carbonatitic composition have been found near the SE shore of the lagoon. The intrusion of these carbonatitic dykes has been linked to the occurrence of recent volcanic events in the Chiva area and interpreted as feeding channels of an eruptive centre with maar morphology. The Chiva carbonatitic dykes show a finely porphyritic texture formed by phenocrysts of subhedral calcite (60 %), apatite (30 %) and magnetite (10 %) hosted in a fine calcite-rich ground mass that also contains accessory minerals such as pyrochlore, perovskite and kimzeyite. The mineralogical and compositional features of the Chiva dykes are similar to those described in some of the carbonatitic lavas from the Catanda graben, suggesting that both volcanic events are genetically related. The finding of this new eruptive centre enlarges the carbonatitic domain of Catanda and opens the door to the discovery of new carbonatitic outcrops in this region of Western Angola.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En las inmediaciones del graben de Catanda (Angola) se localiza una laguna circular de 900 metros de diámetro conocida como laguna de Chiva. Aunque éste área se encuentra mayoritariamente cubierta por sedimentos lacustres, hay afloramientos de un pequeño grupo de diques de composición carbonatítica en la orilla SE de la laguna. La intrusión de estos diques carbonatíticos se relaciona con el desarrollo de eventos volcánicos en la zona de Chiva y se interpreta como los antiguos canales de alimentación de un centro eruptivo que desarrolló una morfología de maar. Los diques carbonatíticos de Chiva presentan una típica textura porfídica formada por fenocristales subhedrales de calcita (60 %), apatito (30 %) y magnetita (10 %) implantados en una matriz de calcita de grano fino con cantidades accesorias de pirocloro, perovskita y kimzeyita. Las características mineralógicas y composicionales de los diques del maar de Chiva son equivalentes a las descritas en las lavas carbonatíticas del graben de Catanda, lo que sugiere que ambos procesos volcánicos están relacionados genéticamente. El hallazgo de este nuevo centro eruptivo amplía la zona de desarrollo del vulcanismo carbonatítico en Catanda y abre la puerta al posible descubrimiento de nuevos afloramientos carbonatíticos extrusivos en esta zona occidental de Angola.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[carbonatites]]></kwd>
<kwd lng="en"><![CDATA[carbonatitic dykes]]></kwd>
<kwd lng="en"><![CDATA[maar]]></kwd>
<kwd lng="en"><![CDATA[Angola]]></kwd>
<kwd lng="en"><![CDATA[Catanda]]></kwd>
<kwd lng="en"><![CDATA[Chiva]]></kwd>
<kwd lng="es"><![CDATA[carbonatitas]]></kwd>
<kwd lng="es"><![CDATA[diques carbonatíticos]]></kwd>
<kwd lng="es"><![CDATA[maar]]></kwd>
<kwd lng="es"><![CDATA[Angola]]></kwd>
<kwd lng="es"><![CDATA[Catanda]]></kwd>
<kwd lng="es"><![CDATA[Chiva]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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