Abstract
High-grade granulites of Chilka Lake area, northern part of Eastern Ghats Belt, India record multiple stages of metamorphism and deformation. The major mapable foliation is designated as transposed S2/S3 which shows folding due to later deformation. Dark-colored massive two pyroxene-bearing mafic granulites occur along the transposed S2/S3 fabric in metapelitic granulite, quartzofeldspathic granulite as well as anorthosite. The contact of this rock with the host metapelitic granulite is marked by a zone of garnet that presumably developed during subsolidus cooling and associated metasomatism. The two-pyroxene granulites occur as folded lenses, pinched-and-swelled bodies due to post-emplacement deformations. All these rocks contain orthopyroxene, clinopyroxene, plagioclase, ilmenite and magnetite as major minerals. Presence of exsolution textures in pyroxene grains is notable feature which possibly developed during subsolidus cooling. Trace element discrimination plot of six samples reveals a MORB-type signature, whereas selective trace element ratios and enriched LREE, flat HREE pattern indicate either Rift-related Basalt or Oceanic Island Basalt (OIB) type characters. Field relations and available geochronological data imply that the mafic magma was intruded within the time span of c. 980–800 Ma. As these mafic bodies and the host rocks were metamorphosed and deformed by the tectonothermal events at c. 800–500 Ma, the mafic magmatism could be correlated with globally recognized igneous activities related to the breakup of Rodinia of which the Eastern Ghats Belt remained an integral part.
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Acknowledgements
SB, KD and SC acknowledge Department of Science and Technology (DST), Government of India for providing the research grant (ESS/251/16/2005). We thank Rakoto Thierry for his help during preparation of rock powders and EPMA analyses. Tamal K. Ghosh is thanked for his help and expertise during EPMA work at IIT Roorkee. We are also thankful to Henry Halls for his comments during the 6th International Dyke conference 2010 where this work was presented. Insightful comments and suggestions from Saibal Gupta helped to revise and improve the quality of the manuscript.
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Bose, S., Das, K., Chakraborty, S., Miura, H. (2011). Petrology and Geochemistry of Metamorphosed Basic Intrusives from Chilka Lake Granulites, Eastern Ghats Belt, India: Implications for Rodinia Breakup. In: Dyke Swarms:Keys for Geodynamic Interpretation. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12496-9_14
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