Petrology and geochemistry of the Mesoproterozoic Vattikod lamproites, Eastern Dharwar Craton, southern India: evidence for multiple enrichment of sub-continental lithospheric mantle and links with amalgamation and break-up of the Columbia supercontinent

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

“…Carbonate metasomatism of the mantle source for the calc‐alkaline and shoshonitic as well as ultramafic lamprophyres, anorogenic lamproites, and ocean island basalts and both continental and oceanic alkali basalts have been proposed by various workers based on elevated Zr/Hf, enrichment of LILEs with respect to the HFSEs (lower Zr/Sm and Hf/Sm ratios) and lower Ti/Eu (e.g., Beier et al, ; Chakrabarti, Basu, Santo, Tedesco, & Vaselli, ; Conticelli et al, ; Dai, Zhao, & Zheng, ; Dai, Zhao, Zheng, An, & Zheng, ; Dai, Zheng, Zhao, & Zheng, ; Guo, Fan, Wang, & Zhang, ; Prevelic, Foley, Romer, & Conticelli, ; Talukdar et al, ; Tappe et al, ; Tappe et al, ; Tappe et al, ; Tappe et al, ; Vichi, Stoppa, & Wall, ; Woodard et al, ; Zeng, Chen, Xu, Jiang, & Hofmann, ). Low Zr and Hf content with respect to Sm in the studied lamprophyres coupled with higher Nb/Yb ratios points to a role of an enriched OIB type mantle source region affected by carbonate metasomatism (Figures and ).…”

“…Hf/Sm vs. Zr/Sm variation plot with compositional field of Nyiragongo lava (Chakrabarti et al, ), carbonatites (Dupuy, Liotard, & Dostal, ) and EDC lamproites (Talukdar et al, and references there in) drawn for comparison [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…Woodard et al () suggest a multistage metasomatic process for the generation of postcollisional shoshonitic lamprophyres at the Karelia Craton margin wherein first episode of mantle enrichment was carried by hydrous alkaline silicate melts followed by carbonatitic melt during the final stages of subduction locking. Recently, Talukdar et al () proposed a similar model to explain mixed orogenic‐anorogenic geochemical affinities of the lamproites at the north‐eastern margin of the EDC.…”

“…Partition coefficient used in partial melting and fractional crystallization calculations are from GERM partition coefficient (Kd) database (https://earthref.org/KDD). Symbols remain same as in Figure 6 [Colour figure can be viewed at wileyonlinelibrary.com] FIGURE 8 Hf/Sm vs. Zr/Sm variation plot with compositional field of Nyiragongo lava (Chakrabarti et al, 2009), carbonatites (Dupuy, Liotard, & Dostal, 1992) and EDC lamproites (Talukdar et al, 2018 and references there in) drawn for comparison [Colour figure can be viewed at wileyonlinelibrary.com] FIGURE 9 Th/Yb vs. Nb/Yb trace element ratio diagram (after Pearce, 2008) showing enriched OIB type mantle source for Korakkodu lamprophyre. Symbols remain same as in Figure 8.…”

Kimberlites, lamproites and lamprophyres from the Indian shield: Highlights of researches during 2016-2019

“…One dyke consisting of a high modal percentage of apatite is classified as pseudoleucite-apatite-phlogopitelamproite. Comprehensive mineralogy and geochemical study including Sr-Nd isotopes of the lamproites from the Vattikod lamproite field is described by Talukdar et al (2018). High K 2 O along with F-rich hydrous mineralogy highlight the role of metasomatic phlogopite and apatite in the mantle source regions.…”