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Orthopyroxene megacrysts from the Chilka Lake anorthosite massif, Eastern Ghats, India: a clue to magmatic evolution

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Abstract

The present study reports the occurrence of orthopyroxene megacrysts from the Chilka Lake anorthosite massif, Eastern Ghats, India. An insight into the mineral chemistry of different phases, coupled with detailed field and petrographic evidences from this study, shed light on a long debate on the origin of orthopyroxene megacrysts in anorthosite massifs. The megacrysts contain exsolved lamellae of plagioclase and opaque oxides (ilmenite, rutile) oriented along orthopyroxene cleavage planes. The trace element distribution patterns of the megacryst and matrix plagioclase are mirror reflections of each other and mutually complementary. The calculated compositions of melts in equilibrium with these two phases show comparable patterns for LREE (light rare earth elements, La–Sm), but differ markedly in terms of HREE (heavy rare earth elements, Eu–Lu), suggesting that the megacrysts and matrix plagioclases did not crystallize simultaneously. We infer that the orthopyroxene megacrysts have a longer crystallization history, initially as a low-Ca non-quad member of the pyroxene group at pressure ≥ 10 kbar, incorporating some amount of Ca, Al and Ti in their structure. Subsequently, they have been carried by a plagioclase crystal mush to mid-crustal levels at pressure ~ 4–6 kbar following a near-isothermal decompression that may be linked to the emplacement of the anorthosite massif, giving rise to the exsolution lamellae of plagioclase and opaque oxides.

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Acknowledgements

We wish to express our sincere gratitude to Akihiro Tamura and Juan Miguel Guotana for their kind assistance in acquiring and processing the LA-ICP-MS data and X-ray elemental maps. Analytical facilities were provided by the Central Petrological Laboratory, Geological Survey of India, Kolkata, and the Earth Science Department, Kanazawa University. We thank one anonymous reviewer, and journal editors Anton R. Chakhmouradian and Lutz Nasdala, for their insightful comments that improved the quality of the manuscript. Financial support from the University Grants Commission (UGC), New Delhi, India, under UGC UPE-II project, sanctioned to the Department of Geology, University of Calcutta, for conducting EPMA analysis, is thankfully acknowledged.

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  1. Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata-700019, India

    Sandip Choudhuri, Rajib Kar, Samarendra Bhattacharya, Sanchari Chatterjee, Anwesha Ghosh & Biswajit Ghosh

  2. Graduate School of Natural Science and Technology, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, 920-1192, Japan

    Tomoaki Morishita

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  1. Sandip Choudhuri
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Choudhuri, S., Kar, R., Bhattacharya, S. et al. Orthopyroxene megacrysts from the Chilka Lake anorthosite massif, Eastern Ghats, India: a clue to magmatic evolution. Miner Petrol 116, 273–286 (2022). https://doi.org/10.1007/s00710-022-00779-x

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