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Rezaei-Kahkhaei, Mehdi, Esmaeily, Dariush, Carmen Galindo Francisco, Carmen. (1393). Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran. , 4(1), 103-123. doi: 10.22059/jgeope.2014.51195
Mehdi Rezaei-Kahkhaei; Dariush Esmaeily; Carmen Carmen Galindo Francisco. "Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran". , 4, 1, 1393, 103-123. doi: 10.22059/jgeope.2014.51195
Rezaei-Kahkhaei, Mehdi, Esmaeily, Dariush, Carmen Galindo Francisco, Carmen. (1393). 'Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran', , 4(1), pp. 103-123. doi: 10.22059/jgeope.2014.51195
Rezaei-Kahkhaei, Mehdi, Esmaeily, Dariush, Carmen Galindo Francisco, Carmen. Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran. , 1393; 4(1): 103-123. doi: 10.22059/jgeope.2014.51195

Geochemical and isotopic (Nd and Sr) constraints on elucidating the origin of intrusions from northwest Saveh, Central Iran

Geopersia
مقاله 8، دوره 4، شماره 1، شهریور 2014، صفحه 103-123    اصل مقاله (4.05 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22059/jgeope.2014.51195
نویسندگان
Mehdi Rezaei-Kahkhaei* 1؛ Dariush Esmaeily2؛ Carmen Carmen Galindo Francisco3
1Department of Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University, Iran
2Department of Geology, University College of Sciences, University of Tehran, Tehran, Iran
3Departamento de Petrología y Geoquímica. Universidad Complutense –IGE (CSIC). C/ José Antonio Novais, n 2, 28040-Madrid, Spain
چکیده
Three intrusive granitoid bodies from northwest Saveh, central Iran, are embedded in volcanic sedimentary rocks of the Eocene,
forming isolated small outcrops: Khalkhab quartz monzodioritic units (SiO2: ~52-57 wt %) to the northwest, Neshveh granodioritic
units (SiO2: ~62-71 wt %) to the northeast, and Selijerd granodioritic units (SiO2: ~63-69 wt %) to the southeast. The Khalkhab unit is
composed of quartz monzogabbro and quartz monzodiorite with medium- to coarse-grained textures. The Neshveh unit is composed
mainly of granodiorite with subordinate granite of medium grain size and a porphyritic texture with plagioclase megacryst. The Selijerd
unit ranges from granodiorite to tonalite with a medium- to coarse-grained granophyric texture. The rocks studied display a relatively
high Na2O content,with a molecular A/CNK ratio less than 1.1, Na2O/ K2O ratio of ~2.06 and calc-alkaline affinity. They contain
modal clinopyroxene, hornblende, magnetite and titanite, suggesting I-type characteristics for these rocks and formation in an active
continental margin. Isotopic data (87Sr/86Sr39Ma= 0.704536-0.704860; ε(Nd)39Ma= 2.2-3.9) from northwest Saveh intrusive rocks are
plotted to the left of bulk silicate Earth. These ratios, together with geochemical data, suggest that the parent magmas of the rocks
studied might be generated by crystal fractionation of arc basalts in crustal magma chambers, coupled with some lower crustal
assimilation prior to silica enrichment, to form quartz monzogabbros. Consequently, granodiorites formed dominantly by crystal
fractionation from evolved parental magmas that ascended into the upper crustal magma chambers.

کلیدواژه‌ها
Saveh؛ Fractional Crystallization؛ I-Type Granitoid؛ Volcanic Arc؛ Central Iran
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