Geochemical characters of leptynites from the Visakhapatnam area in the Eastern Ghats granulite terrane, India

Abstract

Leptynites occur with minor bands of basic granulites, charnockites, calc-silicate rocks, quartzites and khondalites in the Visakhapatnam area in the Eastern Ghats granulite terrane (EGGT), India. Interbedded grey and cream leptynite types are distinguished based on field relations and geochemistry. The mineralogical and geochemical evidences favour a metasedimentary origin for leptynites. The total REE, LREE/HREE and Eu-Eu^∗ data indicate their derivation from the post-Archaean granodioritic upper crust comprising large proportions of impure greywackes with K-rich granitic components.