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Evidence of fluid-induced myrmekite formation after alkali-feldspar megacrysts: an example from a meta-porphyritic granitoid in Makrohar, Madhya Pradesh, India

Published online by Cambridge University Press:  30 November 2023

Arimita Chakrabarty ,
Shreya Karmakar ,
Upama Dutta Open the ORCID record for Upama Dutta [Opens in a new window] ,
Sanjoy Sanyal  and
Pulak Sengupta
Arimita Chakrabarty*
Affiliation:
Department of Geological Sciences, Jadavpur University, Kolkata 700032, India
Shreya Karmakar
Affiliation:
Department of Earth and Environmental Studies, National Institute of Technology (NIT), Durgapur 713209, India
Upama Dutta
Affiliation:
Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
Sanjoy Sanyal
Affiliation:
Department of Geological Sciences, Jadavpur University, Kolkata 700032, India
Pulak Sengupta
Affiliation:
Department of Geological Sciences, Jadavpur University, Kolkata 700032, India
*
Corresponding author: Arimita Chakrabarty; Email: arimitachakrabarty@gmail.com
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Abstract

A meta-porphyritic granitoid in the Makrohar Granulite Belt, Central India contains extensive myrmekite. This work evaluates the controls of fluid in relation to deformation and the formation of myrmekite all along the periphery of an alkali-feldspar megacryst. Two different myrmekite morphologies are present: (1) vermicular intergrowth of plagioclase (An38–39) and quartz (Myr1); and (2) polygonal aggregates of coarse plagioclase (An45–46) and quartz (Myr2). Petrographic features suggest that myrmekite Myr1 nucleates on alkali-feldspar and plagioclase porphyroclasts and the myrmekite front moved into the alkali feldspar by replacing it; and that myrmekite Myr2 and the secondary biotite which replaces plagioclase porphyroclasts and garnet form together. Deformation had a decisive role in forming the polygonal aggregates of Myr2, however field and microtextural features do not support any significant control of deformation during the formation of Myr1. Reaction modelling and a mass-balance calculation suggest that Ca and Na are added to, and K is removed from, the alkali feldspar during the myrmekite formation at nearly constant Si and Al. However, the secondary biotite-forming reaction, consumes K and releases Ca. Interpretation of the reaction textures in different isothermal–isobaric sections of μK2O–μCaO in the KCFASH system suggest that CaO and K2O moved in opposite directions for myrmekitisation and along their respective chemical potential gradients created between the sites of formation of myrmekite and secondary biotite. The feedback mechanism which operated between the two reaction sites was controlled by infiltration of brine-rich fluid in the meta-granitoid during a regional hydration event (550–600oC and 5–6 kbar). Volume reduction of ~10% during the formation Myr1 and Myr2 drew the brine-rich fluid towards the alkali feldspar and thus facilitated the process of myrmekite formation. Variation in the morphology of quartz in the myrmekite is attributed to the cooling of the complex.

Keywords

myrmekitedeformationmetasomatismfluid infiltrationchemical potential
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 15
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Martin Lee

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