Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

The Behaviour of Some Trace Elements in the Alkalic Suite of Koraput, Orissa


Affiliations
1 Department of Geology, Presidency College, Calcutta, India
2 Department of Atomic Energy, Atomic Minerals Division, Petrology Laboratory, New Delhi, India
     

   Subscribe/Renew Journal


Geochemical data for 20 igneous rock samples from alkali complex of Koraput, Orissa are presented and discussed. Trace element contents in 8 individual minerals separated from the rock members have been estimated. The abundances of rare alkali earth metals are distinctly higher in early basic and intermediate members compared to those in a calcalkali suite. Some diadochic element ratios reveal a pronounced change of the variation trends at the ultimate end of the fractionation process. The granitophilc elements are not so remarkably enriched in the late differentiates as expected in low melting temperature constituents. Unlike feldspathoidal syenites of agpaitic complex, the nepheline syenite of Koraput is poor in niobium and zirconium.
Subscription Login to verify subscription
User
Notifications
Font Size

Abstract Views: 146

PDF Views: 2




  • The Behaviour of Some Trace Elements in the Alkalic Suite of Koraput, Orissa

Abstract Views: 146  |  PDF Views: 2

Authors

Mihir K. Bose
Department of Geology, Presidency College, Calcutta, India
A. V. Sankaran
Department of Atomic Energy, Atomic Minerals Division, Petrology Laboratory, New Delhi, India
T. K. Bhattacharya
Department of Atomic Energy, Atomic Minerals Division, Petrology Laboratory, New Delhi, India

Abstract


Geochemical data for 20 igneous rock samples from alkali complex of Koraput, Orissa are presented and discussed. Trace element contents in 8 individual minerals separated from the rock members have been estimated. The abundances of rare alkali earth metals are distinctly higher in early basic and intermediate members compared to those in a calcalkali suite. Some diadochic element ratios reveal a pronounced change of the variation trends at the ultimate end of the fractionation process. The granitophilc elements are not so remarkably enriched in the late differentiates as expected in low melting temperature constituents. Unlike feldspathoidal syenites of agpaitic complex, the nepheline syenite of Koraput is poor in niobium and zirconium.