Mineralium Deposita

, Volume 10, Issue 2, pp 109–119 | Cite as

Sedimentary structures displayed by the ultramafic rocks of Nausahi, Keonjhar District, Orissa, India

  • S. Mukherjee
  • D. Haldar
Article
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Abstract

Gravity-controlled and other sedimentary structures exhibited by the ultramafic rocks of Nausahi, Keonjhar District, Orissa, India, are described and their significance briefly discussed. Mineral-graded and size-graded layering, slump structure and cusp textures formed by the influence of gravity, indicate that the ultramafic rocks under study have not been overturned and that the original depositional floor had a gentle north-easterly slope. The magmatic currents were locally strong enough to give rise to some characteristic structures like small-scale angular discordance, branching of chromite lamina, inclusion of one rock type in another, etc. There are also some structures resembling ripple mark and load cast. The pyroxenite dykes and veins were intruded predominantly in the solid state into the dunite-chromitite associations.

Keywords

India Solid State Characteristic Structure Mineral Resource Rock Type 
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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • S. Mukherjee
    • 1
  • D. Haldar
    • 1
  1. 1.CalcuttaIndia

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