Abstract
Fluid infiltration at great depth during regional metamorphism plays a major role in mass transport and is responsible for significant rheological changes in the rock. Calc-silicate rocks of the Kajalbas area of Delhi Fold Belt, Rajasthan, are characterised by foliation parallel alternate bands of amphibole-rich and clinopyroxene–plagioclase feldspar-rich layers of varying thicknesses (mm to decimetre thick). Textural relation suggests that the amphibole grains formed from clinopyroxene and plagioclase in the late phase of regional deformation. Algebraic analysis of the reaction textures and mineral compositions was performed with the computer program C-Space to obtain the balanced chemical reactions that led to the formation of amphibole-rich bands. The computed balanced reaction is 70.74 Clinopyroxene + 27.23 Plagioclase + 22.018 H2O + 5.51 K++ 1.00 Mg2++ 27.15 Fe2+ = 22.02 Amphibole + 67.86 SiO2 aqueous + 36.42 Ca2++ 8.98 Na+. The constructed reaction suggests that aqueous fluid permeated the calc-silicate rock along mm to decimetre thick channels, metasomatized the clinopyroxene–plagioclase bearing rocks to form the amphibole-rich layers. The regional deformation presumably created the fluid channels thereby allowing the metasomatic fluid to enter the rock system. The above reaction has large negative volume change for solid phases indicating reaction-induced permeability. Thermodynamic calculations suggest that the fluid–rock interaction occurred at 665 ±05∘C and 6.6 ±0.25 kbar (corresponding to ∼20 km depth). Textural modeling integrating the textural features and balanced chemical reaction of the calc-silicate rocks of Mesoproterozoic Phulad Shear Zone thus indicate that extremely channelled fluid flow was reaction enhanced and caused major change in the rock rheology.
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Acknowledgements
SMC acknowledges the financial support from Department of Science and Technology, New Delhi (India) for funding a research project and CAS, Department of Geological Sciences, Jadavpur University, Kolkata. The authors are grateful to Prof S Sengupta for her support during the field work. We thank Mr A Chatterjee for his help during the initial part of the work. The authors are thankful to Prof P Sengupta for his useful discussions during the preparation of the manuscript. The authors appreciate the constructive comments by the anonymous reviewer that improved the clarity of the manuscript.
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Appendix: Compositional matrix for textural modelling
Appendix: Compositional matrix for textural modelling
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Chatterjee, S.M., Choudhury, M.R. & Das, S. Reaction enhanced channelised fluid-flux along mid- crustal shear zone: An example from Mesoproterozoic Phulad Shear Zone, Rajasthan, India. J Earth Syst Sci 125, 1321–1328 (2016). https://doi.org/10.1007/s12040-016-0740-8
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DOI: https://doi.org/10.1007/s12040-016-0740-8