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<datestamp>2018-01-11</datestamp>
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<title lang=en>Origin of the absarokite-banakite association of the Damavand volcano (Iran): trace elements and Sr, Nd, Pb isotope constraints</title>
<creator>Liotard, Jean-Michel</creator>
<creator>Dautria, Jean-Marie</creator>
<creator>Bosch, Delphine</creator>
<creator>Condomines, Michel</creator>
<creator>Mehdizadeh, H.</creator>
<creator>Ritz, Jean-Francois</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Department of Geology [Shahrood] ; Shahrood University of Technology</contributor>
<source>ISSN: 1437-3254</source>
<source>EISSN: 1437-3262</source>
<source>International Journal of Earth Sciences</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-00411553</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00411553</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00411553</source>
<source>International Journal of Earth Sciences, Springer Verlag, 2008, 97 (1), pp.89-102. 〈10.1007/s00531-006-0159-6〉</source>
<identifier>DOI : 10.1007/s00531-006-0159-6</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-006-0159-6</relation>
<language>en</language>
<subject lang=en>absarokite</subject>
<subject lang=en>banakite</subject>
<subject lang=en>trace elements</subject>
<subject lang=en>Sr Nd Pb isotopes</subject>
<subject lang=en>Damavand</subject>
<subject lang=en>Iran</subject>
<subject lang=en>South caspian basin</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The activity of the Damavand volcano (Central Alborz, northern Iran) began 1.8 Ma ago and continued up to 7 ka BP. Although the volcanic suite is clearly of shoshonitic affinity, only two petrographic types can be distinguished in the studied lavas: (1) weakly differentiated absarokites (49 < %SiO2 < 51), scattered around the volcano but with a regional extension, (2) highly differentiated banakites (59 < %SiO2 < 63), which form the bulk of the 4,000 m thick volcanic pile. All lavas are alkalic (3.7 < %K2O < 5), REE and LILE-rich (e.g., 85 < La < 148 ppm; 9 < Th < 32 ppm) and show highly fractionated REE patterns (69 < La/Yb < 115) and pronounced Nb-Ta negative anomalies. The absarokites are characterised by Sr (0.7045-0.7046) and Nd (0.51266-0.51269) isotope compositions close to the Bulk Earth values, and distinct from those of the banakites (0.7047 < Sr-87/Sr-86 < 0.7049, 0.51258 < Nd-143/Nd-144 < 0.51262). The Pb isotope ratios are also slightly lower in the absarokites than in the banakites (18.71 < Pb-206/Pb-204 < 18.77, 15.62 < Pb-207/Pb-204 < 15.63, 38.85 < Pb-208/Pb-204 < 38.91, and 18.77 < Pb-206/Pb-204 < 18.84, 15.62 < Pb-207/Pb-204 < 15.64, 38.94 < Pb-208/Pb-204 < 39.06, respectively). Overall, there is a clear tendency towards higher Sr, Pb and lower Nd isotope ratios with increasing degree of differentiation. This study suggests that the absarokites result from a low degree of partial melting (similar to 5%) of a highly metasomatized mantle source, which inherited its characteristics from an old subduction setting. The initiation of volcanic activity 1.8 Ma ago results from variations in the lithospheric thermal regime, probably related to lithospheric delamination as proposed for Anatolia (Pearce et al. 1990). The banakites are mainly generated by extensive fractional crystallisation (similar to 70%) of the absarokitic magma, with a limited amount (a few percents) of assimilation of an old crustal component, in the form of bulk assimilation or AFC processes, which both can explain the Sr, Nd and Pb isotope data.</description>
<date>2008</date>
</dc>
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