The manuscript employs new petrology, mineral chemistry, phase equilibria modelling, zircon and monazite U-Pb geochronology and trace element data to constrain the metamorphic evolution between the Madurai Block and the PCSZ during the Gondwana Supercontinent amalgamation, the results indicate prograde metamorphism is characterized by sodicgedrite+kyanite assemblage, peak metamorphism at ~950 °C and 12 kbar, zircon and monazite dating show prograde and peak metamorphism at 550-500 Ma and post-orogeny at 460-420 Ma. The manuscript is well written, and the conclusions are supported by the results. This article is definitely having the potential to be considered as a valued and milestone contribution to understand the geodynamic process in southern India. I do hereby recommend acceptance of this paper after minor revision. Minor advices are presented below.

1. From the metamorphic conditions and ages discussed in the manuscript, the granulite experienced two stages of metamorphism especially in the abstract, it seems not proper name the metamorphism as multiple stages. From the results the authors separate three metamorphic grades, including prograde, peak and retrograde, however, in the rest of the manuscript authors rarely mention the retrograde metamorphism. Additionally, what the metamorphic conditions for the prograde and retrograde metamorphism?
2. Authors defined the 460-420 Ma as a later hydrothermal event, any evidence from petrology and monazite trace element data?
3. What’s the orange color represents for in Figure 8?
4. From the zircon and monazite result, the metamorphic age ranges from ca. 600-520 Ma, which is different from the authors proposed 550-520 Ma.
5. Authors haven’t reported the prograde and retrograde metamorphic conditions, how’s the large clockwise P-T path obtained in Figure 13?

Line 355 mm mm
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Line 1037-1038 “loss of Eu content may due to the formation of plagioclase in the later event” better show the evidence in a figure.