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Petrologic Conclusions

  • Alok Krishna Gupta
Chapter
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Silica-deficient potassic rocks are characterized by high K2O content (>3), high K2O/Na2O ratio (>1) and low Si2O/K2O ratio (<15). They have high LREE concentration, sometimes 1,000–1,400 higher than that of chondrites. The LILE/HREE ratios are usually low, but 87Sr/86Sr ratios are usually high (0.707–0.730). The εNd content of these rocks is usually negative compared to average basaltic rocks. If we exclude some exceptional cases, these rocks are relatively young (<25–30 Ma) in the evolutionary history of the earth.

Keywords

Lithospheric Mantle Mantle Plume Field Volcanism Continental Rift SiO2 System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer India 2015

Authors and Affiliations

  1. 1.Mineralogy & PetrologyUniversity of AllahabadAllahabadIndia

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