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Alkali feldspar syenites with shoshonitic affinities from Chhotaudepur area: Implication for mantle metasomatism in the Deccan large igneous province

查看全文 作　　者：[1]K.R.Hari;N.V.Chalapathi [2]Rao;Vikas [3]Swarnkar;Guiting [4]Hou 高影响力作者 机构地区：[1]School of Studies in Geology and Water Resource Management, Pt.Ravishankar Shukla University;[2]Centre of Advance Study in Geology, Banaras Hindu University;[3]Department of Civil Engineering, Yugantar Institute of Technology and Management;[4]The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University高影响力机构 出　　处：《Geoscience Frontiers》索引2014年第5卷第2期,共16页高影响力期刊 基　　金：financial support from Department of Science and Technology, New Delhi in the form of research grant (ESS/16/295/2006) to KRH and NVCR is acknowledged 摘　　要：Two petrologically distinct alkali feldspar syenite bodies(AFS-1 and AFS-2) from Chhotaudepur area,Deccan Large Igneous Province are reported in the present work. AFS-1 is characterized by hypidiomorphic texture and consists of feldspar(Or55Ab43to Or25Ab71), ferro-pargasite/ferro-pargasite hornblende, hastingsite, pyroxene(Wo47, En5, Fs46), magnetite and biotite. AFS-2 exhibits panidiomorphic texture with euhedral pyroxene(Wo47-50, En22-39, Fs12-31) set in a groundmass matrix of alkali feldspar(Or99Ab0.77to Or1.33Ab98), titanite and magnetite. In comparison to AFS-1, higher elemental concentrations of Ba, Sr andPREE are observed in AFS-2. The average peralkaline index of the alkali feldspar syenites is w1 indicating their alkaline nature. Variation discrimination diagrams involving major and trace elements and their ratios demonstrate that these alkali feldspar syenites have a shoshonite affinity but emplaced in a within-plate and rifting environment. No evidence of crustal contamination is perceptible in the multi-element primitive mantle normalized diagram as well as in terms of trace elemental ratios. The enrichment of incompatible elements in the alkali feldspar syenites suggests the involvement of mantle metasomatism in their genesis. 关 键 词：碱性长石 大火成岩省 地幔交代 正长岩 亲和力 钾玄岩 r区 元素比值
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