In this article the contrastive analysis of the reformists and fundamentalists� press texts, related to USA in nuclear talks has been performed in specific periods of time, before and after beginning the last round of nuclear talks between Islamic Republic of Iran and 5+1 group, especially America�s related texts, in Iranian Persian publications as representatives of the two opposite discourses, from the perspective of the Critical Discourse Analysis approach by using socio-semantic features of Van Leeuwen�s model(2008). This study goes beyond studying and the structure description of the discourse practices and examines the ways through which meaning system and structure make possible a special type of action. To do so, a selection of discursive texts of the two Iranian Persian publications belonging to two competitor groups: E�temad as the representative of reformists and Keyhan, the fundamentalists� representative, have been analyzed both qualitatively and quantitatively. The result shows that the opposite ideologies dominating the minds of the writers of the two political groups are reflected in the texts and statistical analysis of the corpus also states that Socio-Semantic features are determined by different ideologies, related to power relations. In other words, Language and discourse at underlying levels are laden with ideology, power relations and dominance, and at surface levels, with discursive features and structures.

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