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Structural framework for the emplacement of the Bolangir anorthosite massif in the Eastern Ghats Granulite Belt, India: implications for post-Rodinia pre-Gondwana tectonics

  • Special Issue Gondwana Collision
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Abstract

Massif type anorthosites at Bolangir, eastern India are emplaced at the vicinity of the proto-Indian craton—Eastern Ghats Granulite belt contact. Micro- and meso-structural evidences indicate that the emplacement of the anorthosite pluton and the adjoining granitoids was syn-tectonic with respect to the D3 deformation phase (950–1,000 Ma) in the host gneiss. Anisotropy of magnetic susceptibility confirms that magnetic fabrics within anorthosite were dominantly developed during D3 deformation. Emplacement of felsic melts in the N-S trending dilatant shear zones in the granitoids, Fe-Ti-Zr-REE rich melt bands along N-S trending shear zones and localized N-S magnetic foliation in anorthosite near the Fe-Ti-Zr-REE rich melt bands indicate change in the stress field from NNW-SSE (D3) to E-W (D4). Available geochronological and paleogeographic data coupled with the structural analyses of the intrusive and the host gneiss indicate that the emplacement of massif type anorthosite in the EGP is not related to the accretion of Eastern Ghats Granulite Belt over proto-Indian continent during late Neoproterozoic.

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Acknowledgments

Part of the study and diagrams (Figs. 16) presented here is carried out by PN during his Ph.D. dissertation at IIT Kharagpur, India. PN acknowledges UGC (India) for financial support. PN also thanks Prof. Abhijit Bhattacharya, IIT Kharagpur for introducing to the spectacular outcrops of the Bolangir Anorthosite Complex. AMS study was carried out with the financial support from DST, grant-in-aid no. 100/IFD/6571/2006-2007, to SB. SB acknowledges the help of Dr. Manish Mamtani, IIT Kharagpur during AMS analysis. We are indebt to Prof. Chris Talbot, Prof. Greiling and the anonymous reviewers for their constructive comments and valuable suggestions. This has greatly helped in restructuring the manuscript. We also express our sincere thanks to Dr. Tamer Abu-Alam, guest editor, for giving us an opportunity to submit the manuscript in the special volume on Gondwana collision.

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Correspondence to P. Nasipuri.

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Editorial handling: T. Abu-Alam

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Supplement 1

Simplified map of the EGGB based on the isotopic composition (Rickers et al. 2011). The location of the anorthosite pluton is also shown in the map. (JPEG 1787 kb)

Supplement 2

Detail lithological and structural map of the folded north western margin of the Bolangir anorthosite pluton and adjoining host gneisses (marked by black box in Fig. 2. (JPEG 3735 kb)

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Nasipuri, P., Bhadra, S. Structural framework for the emplacement of the Bolangir anorthosite massif in the Eastern Ghats Granulite Belt, India: implications for post-Rodinia pre-Gondwana tectonics. Miner Petrol 107, 861–880 (2013). https://doi.org/10.1007/s00710-013-0281-7

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