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Redox Condition and Mineralogical Evidence of the Magma Mixing Origin of the Mafic Microgranular Enclaves (MMEs) from Sircilla Granite Pluton (SGP), Eastern Dharwar Craton (EDC), India

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Journal of the Geological Society of India

Abstract

Mafic microgranular enclaves (MMEs) and Syn-plutonic dykes (SPD) are commonly observed in granitoids and are believed to have a similar period of origin as that of the host. Here the petrographical and mineralogical characteristics of the MMEs and Syn-plutonic dykes from Sircilla granite pluton (SGP), eastern Dharwar craton (EDC), Southern India is presented. The contact relationships of MMEs with the host granite are diffusive or gradational, implying under-cooling and disaggregation of MMEs. Petrographic features such as quartz ocelli, bladed biotite, and acicular apatite grains in mafic enclaves suggest magma mixing/mingling-related processes. Consequently, crystallization temperature and pressure of hornblende and biotite from SPD indicate rapid undercooling and hence suggest their emplacement towards the final stage of pluton evolution. Mineral chemistry studies reveal that the plagioclase in host SGP compositionally varies from An 23–An 27, while the Fe# in biotite vary from 0.47–0.52. The composition of plagioclase and mafic phases in MMEs and the SPDs exhibit variation in compositional range, plagioclase (An 26–An 30), hornblende Mg# (0.42–0.55), and biotite Fe# (0.46–0.54). A decreasing trend in \({{\boldsymbol{f}}_{{{\bf{O}}_{\bf{2}}}}}\) value in MMEs and SPD during progressive crystallization suggest an orogenic tectonic setting of magma formation. Intermediate composition of biotite and plagioclase from MMEs suggest control of magma mixing processes for their formation.

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Acknowledgments

The authors are thankful to Director; CSIR-NGRI for permitting to publish this work. This work forms part of the Ph.D. thesis of the first author. First author acknowledges the UGC-RGNF Fellowship to carry out this work. Authors thank to Ms. S. Manju, Senior Scientist, CSIR-NGRI for help with EPMA analysis. Finally, we thank the anonymous reviewer for providing generous scientific comments on an earlier version which greatly improved the paper.

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  1. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, India

    Ch. Ashok, E. V. S. S. K. Babu, Sarbajit Dash & G. H. N. V. Santhosh

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India

    Sarbajit Dash

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Ashok, C., Babu, E.V.S.S.K., Dash, S. et al. Redox Condition and Mineralogical Evidence of the Magma Mixing Origin of the Mafic Microgranular Enclaves (MMEs) from Sircilla Granite Pluton (SGP), Eastern Dharwar Craton (EDC), India. J Geol Soc India 98, 1237–1243 (2022). https://doi.org/10.1007/s12594-022-2158-z

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