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|Title:||Implications of the geochemistry of the pelitic granulites of the Delhi supergroup, Aravalli mountain belt, Northwestern India|
|Publisher:||ELSEVIER SCIENCE BV|
|Citation:||PRECAMBRIAN RESEARCH, 87(1-2), 75-85|
|Abstract:||An isolated granulite terrain occurs within the linear zone of schists and amphibolites of the Proterozoic Delhi Supergroup, in the Aravalli mountain belt of NW India. The geochemistry of the pelitic granulites of such terrains suggests the arkosic to shaley nature of the protolith. These rocks are characterized by a high maturity index, low to intermediate Fe2O3 + MgO values (5.78%), high La/Sc (8.3), Th/Sc (4.0) and Ni/Co (1.4) ratios and, low Ti/Zr (16), Sc/Cr (0.16) and Sc/Ni (0.16) ratios which imply a passive continental margin nature of the basin. The high K2O value (3.0%), high K2O/Na2O ratio (1.96), LREE enrichment, flat HREE pattern, consistent negative Eu anomaly, high La-cn/Yb-cn (10.6) and Th/Sc (4.0) ratios and low La/Th (2.4) ratio, low Ni (30 ppm) and Cr (47 ppm) contents, and uniform Zr/Hf ratio largely reflect continental provenance and probable Proterozoic age. These rocks also differ from Archaean granulites of the fold belt with regards to K2O and Th/U values and deformational history. (C) 1998|
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