Abstract
We present the structural history of a suite of high-grade rocks of the Phulbani area of the Eastern Ghats Belt, India, based on structural study at meso- and micro-scales combined with published metamorphic and the geochronological data. Structural data suggest multiple generations of fabric (S1–S5) development during a punctuated deformational history (D1−D5). The S1 fabric is present only in grain-scale and developed during the prograde metamorphic stage (M1). The regionally recognizable composite S2/S3 gneissic fabric developed in the realm of ultra-high temperature metamorphism (D2/D3, M2) during ca. 987–970 Ma as a result of the contraction and closure of the continental back-arc basin. The D4 deformation folded the earlier formed composite S2/S3 gneissic fabric and developed a shear-related mylonitic foliation (S4), possibly after ca. 970 Ma. Deformation in the Phulbani area culminated through the formation of the S5 mylonitic fabric (D5, M3) along the Ranipathar Shear Zone, possibly at ca. 500 Ma, which exposed the anomalously hot deep continental crustal rocks to shallower crustal level. Development of the Ranipathar Shear Zone is interpreted to be kinematically linked with several other such crustal-scale shear zones in the area which together played a pivotal role in the final tectonic evolution of the northern Eastern Ghats Belt.
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