<?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>1794-6190</journal-id>
<journal-title><![CDATA[Earth Sciences Research Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Earth Sci. Res. J.]]></abbrev-journal-title>
<issn>1794-6190</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-61902021000200237</article-id>
<article-id pub-id-type="doi">10.15446/esri.v25n2.74025</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Geochemistry and petrogenesis of basic Paleogene volcanic rocks in Alamut region, Alborz mountain, north of Iran]]></article-title>
<article-title xml:lang="es"><![CDATA[Geoquímica y petrogénesis de las rocas volcánicas básicas del Paleogeno en la región de Alamut, montaña de Alborz, norte de Irán]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sarem]]></surname>
<given-names><![CDATA[Mehdi Nazari]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abedini]]></surname>
<given-names><![CDATA[Mansour Vosoghi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dabiri]]></surname>
<given-names><![CDATA[Rahim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ansari]]></surname>
<given-names><![CDATA[Mohammad Reza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Islamic Azad University Department of Geology ]]></institution>
<addr-line><![CDATA[Tehran ]]></addr-line>
<country>Iran</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Islamic Azad University Department of Geology ]]></institution>
<addr-line><![CDATA[Mashhad ]]></addr-line>
<country>Iran</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Islamic Azad University Department of Geology ]]></institution>
<addr-line><![CDATA[Chalous ]]></addr-line>
<country>Iran</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>25</volume>
<numero>2</numero>
<fpage>237</fpage>
<lpage>245</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-61902021000200237&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-61902021000200237&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-61902021000200237&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The activities of Alborz Tertiary magmatism are mainly attributed to the subduction and closure of Neo-Tethys. These phenomena, including the magma origin of this lesser area, are investigated in this study. In addition, the origin of the magma characteristics based on the geochemistry of main and rare elements is also studied, and a model is presented for their tectonomagmatic status. Volcanic Tertiary Alamut is part of magmatism in the central Alborz-west sequence of volcanic rocks (including basalt, trachyandesite, and basaltic andesite with alkaline geochemical properties, with porphyritic texture, pyroclastic rocks, and volcanic breccia) directly above the units belongs to the Karaj Formation (Middle Eocene age). Geochemical properties indicate that the parent magma is characterized by high ratios of LREE/HREE as well as Th/Nb, La/Nb, Ba/Nb, Zr/Nb, and low K/Nb ratios. The early basaltic magma is formed from a garnet lherzolite mantle by phlogopite/pargasite metasomatism at 2.5-5.3 GPa and depths of more than 80-150 km. Structural evidence suggests the formation of these volcanic rocks in a continental rift zone setting. The appearance of these rocks can be attributed to the effects of intercontinental extensional phases in deep faults during Eocene Alpine orogeny phases. The primary focus of this study is to provide the geological, petrographical, and geochemical data findings of the volcanic basaltic rocks along with the results of studying other rocks in this region. Aside from the mode and their formation, magma forming is also investigated. Moreover, for the rocks investigated in this study, the environment and the site of the tectonic-magmatic region are also clarified in detail.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las actividades del magmatismo terciario en Alborz (Irán) se atribuyen principalmente a la subducción y final del neotetis. Este fenómeno es el objeto de este estudio, además de un acercamiento al origen del magma de esta área inferior. Adicionalmente, los autores estudiaron las características y origen del magma con base en la geoquímica de los elementos principales y de las tierras raras, y presentaron un modelo de su estado tectonomagmatico. El terciario volcánico de Alamut es parte del magmatismo en la secuencia central de rocas volcánicas en Alborz occidental (incluye basalto, traquiandesita, y andesita basáltica con propiedades geoquímicas alcalinas, con textura porfirítica, rocas piroclásticas y brecha volcánica), directamente sobre las unidades pertenecientes a la Formación Karaj (del Eoceno medio). Las propiedades geoquímicas indican que el magma madre se caracteriza por altos índices de elementos tierras raras ligeros y elementos tierras raras pesados, al igual que proporciones torio/niobio, lantano/ niobio, bario/niobio, circonio/niobio y menormente potasio/niobio. El magma basáltico temprano está formado por un manto de lherzolitas de granate con metasomatismo flogopita/pargasita a 2.5-5.3 Gpa y profundidad entre 80 y 150 kilómetros. La evidencia estructural sugiere la formación de estas rocas volcánicas en un ambiente de grieta continental. La aparición de estas rocas puede atribuirse a los efectos de las fases extensionales intercontinentales en fracturas profundas durante las fases orogénicas del Eoceno alpino. El enfoque principal de este estudio es proporcionar la información hallada en términos geológicos, petrográficos y geoquímicos de las rocas volcánicas basalticas al igual que los resultados del análisis de otras rocas en el área. Más allá de su modo y formación, los componentes del magma también se analizaron. Además, para las rocas investigadas en este estudio, el ambiente y el sitio de la región tectonomagmática se aclararon detalladamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Geochemical modeling]]></kwd>
<kwd lng="en"><![CDATA[Central Alborz]]></kwd>
<kwd lng="en"><![CDATA[Petrology]]></kwd>
<kwd lng="en"><![CDATA[Paleocene]]></kwd>
<kwd lng="es"><![CDATA[modelo geoquímico]]></kwd>
<kwd lng="es"><![CDATA[Alborz central]]></kwd>
<kwd lng="es"><![CDATA[petrología]]></kwd>
<kwd lng="es"><![CDATA[Paleoceno]]></kwd>
</kwd-group>
</article-meta>
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