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Age and Origin of the Chilka Anorthosites, Eastern Ghats, India: Implications for Massif Anorthosite Petrogenesis and Break-up of Rodinia

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Topics in Igneous Petrology

Abstract

Massif anorthosites are important Proterozoic continental crustal components with worldwide occurrences along linear belts. Two major questions concerning these massif-anorthosites are whether they have broadly similar ages, and whether their parent magmas are mantle-derived or lower continental crust-derived. The Chilka massif anorthosites, hosted by the Proterozoic Eastern Ghats mobile belt of eastern India, yield 855 ± 31 Ma U–Pb zircon crystallization age that overlaps with the breakup of Rodinia. This age is considerably younger than Grenville-age global massif anorthosites. Trace elements and Nd–Sr–Pb isotopic compositions of the Chilka anorthosites imply derivation from a depleted mantle source contaminated by late-Archean to early-Proterozoic lower continental crust. We suggest that this mantle upwelling to generate the Chilka anorthosites was a result of ‘edge-driven convection’ given that the Eastern Ghats Belt, hosting the Chilka anorthosites was located 1,000 km away from the margin of the southern Indian cratons in the Neoproterozoic Rodinia. Alternatively, we also consider that the anorthosites’ parent magma formed as a result of the regional extensional tectonism at ca. 850 Ma affecting this segment of Rodinia, as recently suggested by some workers.

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Acknowledgments

This study was supported by NSF grants to ARB. We are indebted to late Professor Amitabha Chakrabarti of the Indian Institute of Technology, Kharagpur, India for his encouragement, help and guidance in the field for the sample collection for this study. This paper is dedicated to Professor Mihir K. Bose of Presidency College, Calcutta, who inspired the authors ARB and PKB of this study by his exemplary teaching and enthusiasm in the class room and by his life-long dedication to petrological research in India. The ionprobe facility at UCLA was in part supported by the NSF EAR Instrumentation and Facility Program. The present version of the paper is much improved by the suggestions and reviews by S. A. Morse and two other anonymous reviewers.

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Chakrabarti, R., Basu, A.R., Bandyopadhyay, P.K., Zou, H. (2011). Age and Origin of the Chilka Anorthosites, Eastern Ghats, India: Implications for Massif Anorthosite Petrogenesis and Break-up of Rodinia. In: Ray, J., Sen, G., Ghosh, B. (eds) Topics in Igneous Petrology. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9600-5_14

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