《Table 1 Major element (wt%) and normative minerals data of Miocene alkaline and calc-alkaline lavas

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《"Geochemistry and Petrogenesis of Intracontinental Basaltic Volcanism on the Northwest Arabian Plate, Gaziantep Basin, Southeast Anatolia, Turkey"》

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The results of the chemical analyses and normative CIPW compositions of the 21 studied samples are given in Table 1，and the results of the trace and REE analyses are presented in Table 2.The loss on ignition（LOI）ratios of the samples collected from the study area are<3 wt%（except for four samples）.This property indicates that these rocks are unaffected by hydrothermal alteration.The samples with high LOI ratios exhibit similar K2O and U concentrations to those of the rest of the samples（Tables 1–2）.The main oxide values are close to one another，as shown in the table.The Si O2 values also range in a narrow interval of 43.30%–53.35%and represent rocks with basic composition（Fig.3a）.Although the Si O2 contents of the samples range in such a narrow interval（Fig.3a），the samples are concentrated in two areas.Given that several large ion lithophile elements（LILE）are mobile（Floyd and Winchester，1975），using these elements in the diagrams should be carefully reconsidered.Accordingly，the samples are reclassified using comparably immobile elements，such as Ti，Zr，Nb，and Y（HFSE）（Fig.3b，Winchester and Floyd，1977） .Similar to those in the alkaline silica diagram（Fig.3a），samples in this diagramare also divided into two groups.The total alkaline contents of all the samples are the same；their silica contents differ，and samples with low silica contents are highly alkaline in nature（Fig.3a）.A similar situation is observed in Zr/Ti and Nb/Y ratios（Fig.3b）.The samples with low Nb/Y ratios are sub-alkaline in nature，whereas those with high Nb/Y ratios are alkaline.These differences in the discrimination diagrams indicate that the volcanic rocks of the study area possess two different compositions:strongly basic and alkaline（1）and weakly basic and calc-alkaline（2）（Fig.3b） .No petrographic difference exists between the two series of rocks，but samples with alkaline composition contain normative nepheline（Table 1）.