Abstract
Field and petrographic studies are carried out to characterize the interactions of mafic and felsic magmas from Pithora region of the northeastern part of the Bastar Craton. The MMEs, syn-plutonic mafic dykes, cuspate contacts, magmatic flow textures, mingling and hybridization suggest the coeval emplacement of end member magmas. Petrographic evidences such as disequilibrium assemblages, resorption textures, quartz ocelli, rapakivi and poikilitic textures suggest magma mingling and mixing phenomena. Such features of mingling and mixing of the felsic and mafic magma manifest the magma chamber processes. Introduction of mafic magmas into the felsic magmas before initiation of crystallization of the latter, results in hybrid magmas under the influence of thermal and chemical exchange. The mechanical exchange occurs between the coexisting magmas due to viscosity contrast, if the mafic magma enters slightly later into the magma chamber, then the felsic magma starts to crystallize. Blobs of mafic magma form as MMEs in the felsic magma and they scatter throughout the pluton due to convection. At a later stage, if mafic magma enters the system after partial crystallization of felsic phase, mechanical interaction between the magmas leads to the formation of fragmented dyke or syn-plutonic mafic dyke. All these features are well-documented in the study area. Field and petrographic evidences suggest that the textural variations from Pithora region of Bastar Craton are the outcome of magma mingling, mixing and hybridization processes.
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Director, CSIR-NGRI is thanked for permitting to publish this work. This work is an outcome of the INDEX WP 2.3 (MRM), and forms part of the PhD work of the first author. We thank the two anonymous reviewers for their critical comments that have helped to significantly improve the previous version of manuscript.
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Elangovan, R., Krishna, K., Vishwakarma, N. et al. Interaction of coeval felsic and mafic magmas from the Kanker granite, Pithora region, Bastar Craton, Central India. J Earth Syst Sci 126, 92 (2017). https://doi.org/10.1007/s12040-017-0886-z
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DOI: https://doi.org/10.1007/s12040-017-0886-z