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Exsolution intergrowth of cpx-opx and pseudosection modelling of two-pyroxene mafic granulite from Daltonganj of Chhotanagpur Granite Gneiss Complex, Eastern India

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Abstract

In this study, we reconstruct for the first time the evolution of a two-pyroxene mafic granulite from the Daltonganj of Chhotanagpur Granite Gneiss Complex (CGGC). Transmission electron microscopy (TEM) revealed that some of the clinopyroxene have exsolution texture, where orthopyroxene occurs as thin lamellae within the porphyroblast of clinopyroxene. To tightly constrain the P-T conditions at which exsolution lamellae developed after the metamorphic peak, we have applied both conventional and multi-equilibrium thermobarometry, as well as forward thermodynamic modelling. Results from multi-equilibrium thermobarometry, using the software THERMOCALC, suggest peak conditions of the mafic granulite at average pressure-temperature (PTav) conditions of 6.7 ± 1.19 kbar/814 ± 60 °C. In contrast, exsolution bearing opx-cpx minerals crystallised at relatively lower temperature (772 ± 14 °C), determined by the conventional geothermometers. The peak to retrograde evolution of these mafic granulites is constrained through phase equilibrium modelling in the NCKFMASHTO (Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O) model system using the software Perple_X. Phase equilibria results of peak conditions (i.e. 6.0–6.78 kbar and 775–808 °C) are consistent with respect to those obtained through multi-equilibrium and conventional thermobarometry, while the retrograde path is defined down to ~4.5 kbar and ~540 °C. Our results have twofold implications: (i) they show how the integrating of different geothermobarometric methods is the best proxy to tightly constrain the evolution of high-grade metamorphic rocks, and (ii) they pavement to new constraints on the Paleoproterozoic to Neoproterozoic evolution of the CGGC.

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Acknowledgements

We are thankful to the Director, Indian Institute of Technology (BHU), for providing infrastructure and funds to complete this work. R.R. Kumar is also grateful to the UGC-JRF scheme for providing financial support for the present work. The authors express their gratitude to Professor N.V. Chalapathi Rao and Dr Dinesh Pandit from Mantle Petrology Laboratory, Department of Geology (CAS), Institute of Science, BHU, for providing the EPMA analyses facility. We are thankful for the anonymous reviewers and editor of the journal for their constructive comments to improve the manuscript in the present form.

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    Ravi Ranjan Kumar & Shyam Bihari Dwivedi

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Ravi Ranjan Kumar: the area was visited for sample collection. Analytical works such as EPMA, TEM, SEM and XRF were performed for data collection. Paper writing and the interpretation of evolutionary history. Shyam Bihari Dwivedi: providing valuable suggestions in paper writing and preparing the theme of this paper.

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Kumar, R.R., Dwivedi, S.B. Exsolution intergrowth of cpx-opx and pseudosection modelling of two-pyroxene mafic granulite from Daltonganj of Chhotanagpur Granite Gneiss Complex, Eastern India. Arab J Geosci 14, 767 (2021). https://doi.org/10.1007/s12517-021-07093-4

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