REE geochemistry of monazites from coastal sands between Bhimunipatnam and Konada, Andhra Pradesh, East coast of India

The rare earth elements (REE) geochemistry of monazites of Bhimunipatnam—Konada coastal sand deposit was studied using EPMA method. The average LREE concentration was 53.31%, which is more than HREE (av 1.38%). ΣLREE more than actinides (Th + U) indicates that provenance for monazite in the study ar...

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Bibliographic Details
Published in:Current science (Bangalore) 2016-04, Vol.110 (8), p.1550-1559
Main Authors: Naidu, K. Bangaku, Reddy, K. S. N., Sekhar, Ch. Ravi, Rao, P. Ganapati, Krishna, K. N. Murali
Format: Article
Language:English
Subjects:
Beaches
Coasts
Erosional sand landforms
Geochemistry
Mineral deposits
Minerals
Monazites
RESEARCH COMMUNICATIONS
Sand
Sediments
Yttrium
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Summary:The rare earth elements (REE) geochemistry of monazites of Bhimunipatnam—Konada coastal sand deposit was studied using EPMA method. The average LREE concentration was 53.31%, which is more than HREE (av 1.38%). ΣLREE more than actinides (Th + U) indicates that provenance for monazite in the study area is garnet-bearing paragenesis rocks such as charnockites and metapelitic rock (khondalite). The REE fractionation patterns and positive europium anomalies indicate that monazites were formed from magma/anatectic melt with high oxygen fugacity. The geochU–Th–Pb emical dating of monazites is 1000 Ma (average), which indicates that they are derived from protoliths of charnockites and metapelitic rocks such as khondalites, which are formed during meso–neo-Proterozoic ages in the Eastern Ghats Granulite Belt.
ISSN:0011-3891
DOI:10.18520/cs/v110/i8/1550-1559