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Geochemical Modelling of Melting and Cumulus Processes: A Theoretical Approach

  • K. Vijaya KumarEmail author
  • K. Rathna
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Part of the Society of Earth Scientists Series book series (SESS)

Abstract

Mantle melting and fractional crystallization are two fundamental processes that control the compositional variations in the erupted basaltic melts. Most of the geochemical variations in the primary mantle-derived melts are generally attributed to mantle heterogeneity. With simple forward modelling techniques, it is illustrated that different melting types (batch, fractional and continuous) are capable of producing large variations in elemental abundances in the primary magmas derived from a homogeneous mantle source. There is no reason to invoke mantle heterogeneity. Similarly, variations in the cumulate and corresponding residual liquid geochemistry are demonstrated alluding to rare earth element abundances. Variable partition coefficients for cumulus phases and different amounts of intercumulus liquid depict pseudo liquid-lines-of-descent in cumulate rocks on X–Y type plots. It is documented that assimilation fractional crystallization (AFC) produces greater variations in trace element concentrations in both cumulates and residual liquids. It is found that infinitesimally small solid and liquid compositions, amended by AFC, have similar trace element abundances. Two Indian examples are cited to support the theoretical modelling of mantle melting and cumulus processes presented here.

Keywords

Mantle Partial melting Fractional crystallization Geochemical modelling 

Notes

Acknowledgments

Part of this article was earlier published in DST DCS News Letter by KVK on the invitation of Shri. T. M. Mahadevan. I thank Prof. C. Leelanandam for data on the Kondapalli layered complex and Prof. C. Leelanandam and Prof. Santosh Kumar for constructive reviews.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.School of Earth SciencesSRTM UniversityNandedIndia

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