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Contributions to Mineralogy and Petrology

, Volume 163, Issue 5, pp 789–806 | Cite as

An intercontinental correlation of the mid-Neoproterozoic Eastern Indian tectonic zone: evidence from the gneissic clasts in Elan Bank conglomerate, Kerguelen Plateau

  • Nilanjan Chatterjee
  • Kirsten Nicolaysen
Original Paper

Abstract

The Kerguelen Plateau is a submarine, Cretaceous Large Igneous Province in the southern Indian Ocean. Drilling on Elan Bank, a western salient of the Kerguelen Plateau, yielded a ~26 m section of fluvial conglomerate intercalated with basalt. Chemical dating of monazite within garnet and matrix monazite in metapelitic clasts from the conglomerate indicates that high-grade metamorphism of the pelitic protolith occurred between 785 ± 12 and 694 ± 18 Ma. A calculated P–T pseudosection indicates that the observed core-to-inner rim compositional zoning in garnet is consistent with P/T decrease from 10.2 kb/760°C to 6.2 kb/560°C. In an Early Cretaceous paleogeographic reconstruction, the Elan Bank drill site is located on a SSW continuation of the Eastern Indian Tectonic Zone (EITZ), a 876–784 Ma, NNE–SSW metamorphic belt with sinistral shear zones in eastern India. The retrograde P–T path of the Elan Bank metapelitic clast overlaps with that of the EITZ metapelite, and the Elan Bank monazite chemical dates and previously determined 824–675 Ma U–Pb isotope monazite dates by the TIMS method are remarkably similar to the monazite chemical dates from the EITZ metapelites and high-grade metamorphic rocks from the eastern margin of the Eastern Ghats Belt. Based on the demonstrable affinity of metamorphic, geochronologic, and spatial data, this study concludes that the EITZ was likely a continuous, ~1,800–km-long tectono-metamorphic belt in the Rodinia supercontinent stretching from eastern India through the Eastern Ghats to the basement of Elan Bank and probably to the Rayner Complex of East Antarctica.

Keywords

Elan bank Kerguelen plateau Eastern Indian tectonic zone Metapelite Monazite chemical dating Mid-Neoproterozoic metamorphism 

Notes

Acknowledgments

We gratefully acknowledge the constructive comments from Ingo Braun and two anonymous reviewers during peer review, and informal discussions with Fred Frey that greatly improved the presentation of the manuscript. This research used samples provided by the ODP. The ODP was sponsored by the US National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions Inc. Research by KN was supported by a grant from the Joint Oceanographic Institutions US Science Support Program, and KN thanks Michael Jercinovic at the University of Massachusetts, Amherst, for assistance during the acquisition of the chemical dates at that facility.

Supplementary material

410_2011_699_MOESM1_ESM.eps (2 mb)
Fig. A1 Comparison of silicate mineral compositions from the Elan Bank metamorphic clasts and the northern EITZ metapelites. Solid symbols: Elan Bank (this study, and N01: Nicolaysen 2001), open symbols: northern EITZ (Chatterjee et al. 2010). Supplementary material 1 (EPS 2002 kb)
410_2011_699_MOESM2_ESM.tif (19.4 mb)
Fig. A2 Rim-to-rim variation in pyrope (Prp), grossular (Grs), almandine (Alm), and spessartine (Sps) contents (mole %) in garnet porphyroblasts in northern EITZ metapelite samples (a) GR34 and (b) DM112 (see Chatterjee et al. 2010). These zoning patterns are similar to the zoning patterns of garnet in the Elan Bank metapelitic clast shown in Fig. 5. Supplementary material 2 (TIFF 19841 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of EarthAtmospheric and Planetary Sciences, Massachusetts Institute of TechnologyCambridgeUSA
  2. 2.Department of GeologyWhitman CollegeWalla WallaUSA

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