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| 1 | Alkali feldspar syenites with shoshonitic affinities from Chhotaudepur area: Implication for mantle metasomatism in the Deccan large igneous province显示文摘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. | K.R.Hari N.V.Chalapathi Rao Vikas Swarnkar Guiting Hou | 2014 | Geoscience Frontiers2014，5，2： | 1 |
| 2 | Dyke Emplacement in the Narmada Rift Zone and Implications for the Evolution of Deccan Traps显示文摘Dykes are primarily extensional fractures that form perpendicular to the minimum principal compressive stress,which have been extensively studied in the world during the past decades for various reasons including | JU Wei HOU Guiting K.R.HARI | 2016 | Acta Geologica Sinica(English Edition)2016，90，S1： | 0 |
| 3 | Geochemical constraints on the tectonic setting of the Sonakhan Greenstone Belt, Bastar Craton, Central India显示文摘The Neo-Archean Sonakhan Greenstone Belt(SGB) located in the north-eastern fringes of Bastar craton,Central India, is dominated by Basalts, Andesites, Dacites and Rhyolites association. Partial melting modeling on the SGB metabasalts indicates that these rocks were derived by20% melting of spinel peridotite. Fractional crystallisation modeling with REE reveal that the most evolved samples represent the product of fractional crystallization of least evolved magma with 35% plagioclase, 35% clinopyroxene,20% olivine, 5% magnetite and 5% ilmenite as fractionating minerals with 40% remaining magma. Depletion of HFSE with reference to the LILE and LREE/HFSE ratios and Nb, Zr anomalies in the multi-element diagram of the mafic rocks of SGB indicate Island arc magmatic setting.The enriched Th/Yb values further substantiate that the mantle arrays were modified by subduction-related fluids or melts. The general conclusions drawn indicate that the metabasalts from the SGB were formed as a result of subduction of an intraoceanic lithosphere in a fore-arc suprasubduction zone environment. | S.D.Deshmukh K.R.Hari P.Diwan M.P.Manu Prasanth | 2018 | Acta Geochimica2018，37，3： | 0 |
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