Geochemical studies of Armoor granites, Nizamabad District, Telangana: Evidence of remelting of older crustal source

Geochemical studies of Armoor granites, Nizamabad District, Telangana: Evidence of remelting of older crustal source
Author(s):
A. Ajay Kumar, Ch. Karunakar, M. Srinivas, K. Sreenu
Keywords:
Armoor, Granite, Geochemistry, LREE, LILE, and Remelting.
Abstract
In order to understand its petrogenesis and involvement in crust formation, we provide petrographic and whole-rock geochemical data for Armoor granitic rocks in the northeastern portion of the Eastern Dharwar Craton (EDC). The coarse-grained, light grey to pinkish color granites of the study area. Plagioclase, quartz, and alkali feldspar comprise the Armoor granite, with biotite displaying altered and intergranular textures. Geochemically, the nature of Armoor granite ranges from metaluminous to peraluminous and magnesian. On the chondrite normalized REE diagram, the Armoor granites have positive europium anomalies; rich Sr/Y, (Dy/Yb) N ratios and reduced Mg#, Rb/Sr, Rb, Sr indicate that the melting of earlier rocks and residual garnet source formed at high pressures. Furthermore, they comprise greater amounts of LREE than HREE and LILE than HFSE. Nb, Ta, and Ti all display negative anomalies on primitive normalized spider diagrams indicating formed at the subduction zone setting. We hypothesize that the Armoor granites derive from the remelting of earlier rocks.
Article Details
Unique Paper ID: 157688 Publication Volume & Issue: Volume 9, Issue 7 Page(s): 791 - 798
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