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Mineralogy and Petrology

, Volume 112, Issue 2, pp 267–277 | Cite as

Mineralogy and geochemistry of picro-dolerite dykes from the central Deccan Traps flood basaltic province, India, and their geodynamic significance

  • Ashish Dongre
  • K. S. Viljoen
  • A. Rathod
Short Communication
  • 281 Downloads

Abstract

Constituent mineral compositions and whole rock major element geochemistry of picro-dolerite dykes from the central part of the Deccan flood basalt province are presented and discussed. The dykes are characterized by an MgO content of about 13 wt%, coupled with 13–16 modal percents of olivine. A high whole rock molar Mg# value of ~ 71 and the presence of magnesian olivine phenocrysts (~ Fo78) are consistent with a primitive (i.e. unevolved) geochemistry. The nature and composition of clinopyroxene (augite and pigeonite), plagioclase feldspar (labradorite) and Fe-Ti oxides (mostly ilmenite and magnetite) are also discussed, with implications drawn with respect to the geodynamics. High MgO magmas and rocks such as picrites are generally considered to be indicative of plume magmatism, formed by high degrees of partial melting in, e.g. the high-temperature region of a plume head. Recent age data is consistent with a model in which the Deccan LIP picritic magmatism is associated with the main phase of Deccan Trap activity at ~ 66 Ma, as a result of a syn- to post rifting phase associated with the impact of the Rèunion mantle plume. It is speculated that the differentiation of primary olivine basaltic magma of picritic composition, may have been the mechanism for the generation of alkalic basalts which occurs in the Deccan Trap basaltic sequence.

Keywords

Deccan Trap Picro-dolerite Picrite Large igneous province Mantle plume 

Notes

Acknowledgements

We thank C. Reinke of the University of Johannesburg Central Analytical Facility for his assistance with the EPMA and XRF analyses. A.D. is indebted to D. Meshram, Head of the Geology Department, Savitribai Phule Pune University, for support, and K. Wanjarwadkar for the helpful discussions that ensued during the course of this study.We thank chief editor L. Nasdala, associate editor X. Xu and two anonymous reviewers for their constructive comments. Co-author K.S.V. acknowledges funding from the Centre of Excellence for Mineral and Energy Resource Analysis, University of Johannesburg, and the South African National Research Foundation, under their Incentive Funding for Rated Researchers Programme.

Supplementary material

710_2017_539_MOESM1_ESM.docx (12 kb)
Supplementary material 1 (DOCX 12 KB)
710_2017_539_MOESM2_ESM.xlsx (46 kb)
Supplementary material 2 (XLSX 46 KB)

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© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  1. 1.Department of GeologySavitribai Phule Pune UniversityPuneIndia
  2. 2.Department of GeologyUniversity of JohannesburgAuckland ParkSouth Africa

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