In this article, the authors report petrological features, LA-ICP-MS U-Pb ages, whole-rock major and trace data, and Sr-Nd isotopic results for a bimodal intermediate-felsic magmatic suite from East Junggar (NW China). They discuss the petrogenesis of intermediate and felsic volcanic rocks, and tectonic implications. The data are of high quality, and the conclusions are generally convincing. I read it and find that the paper fits very well with the interest of the readership of the journal and thus deserves publication in the journal after some moderate revisions.

1) What I am most concerned about is the lack of presentation of previous research data in this article. This is especially true when the authors try to use the results of this study to constrain some regional-scale scientific issues. In section 6.4.2, nearly all discussions rely solely on the studied volcanic rocks. Igneous rocks are not the only products of geological processes, and other evidence should be considered together. Besides, I strongly recommend that the authors compile some recently published geochemical and isotopic data for Late Paleozoic igneous, at least for Carboniferous to Permian volcanic rocks, from the East Junggar. These background data should be plotted on geochemical diagrams.

2) Lines 366 to 374: I agree that the MELTS simulation can provide important constraints on the petrogenesis of igneous rocks, in particular volcanic rocks. However, more parameters for the partial melting, such as water contents and oxygen fugacity, should be introduced herein. Besides, compositions of M1, M2, and A1 in Table 4 should be plotted on figures 6 and 7.

3) Lines 396-398: Whether we can observe the amphibolite or granulite facies metamorphism depend on not only the occurrence of the metamorphism but also the uplift and exhumation history of the study area. Besides, if the amphibolite or granulite facies metamorphism did take place, it was likely the plutonic island arc rocks accumulating at lower crust levels that suffered the partial melting and metamorphism, rather than their volcanic counterparts. In fact, in lines 415-422, authors state that “underplated basaltic rocks at the lower crust could be the major source rocks of these intermediate rocks”. In my opinion, the geochemical features of intermediate rocks very likely ultimately inherited from a metasomatized mantle wedge, which implies that earlier-formed island arc rocks were plausible source rocks.

4) A plot of age versus εNd(t) should be added in the revised manuscript. Since Rb-Sr isotopic data are meaningless in studying the petrogenesis of the rhyolitic rocks, the present version of the manuscript does not contain any figure illustrating the Nd isotopic features of the studied felsic rocks. The previously published Nd isotopic data of Late Paleozoic magmatic rocks, at least volcanic rocks, should be plotted on this plot as well.

5) Lines 504-522: Likewise, more parameters for the partial melting, such as water contents and oxygen fugacity, should be introduced herein. LY 02-5, M3, and ZK 5-1-9 should be labeled specifically in diagrams.

Other suggestions for the detailed modifications are marked in the attached PDF file.

I have read the revised version of the manuscript, and I think that the revised ms are improved significantly according to the suggestions by reviewers.I am pleased to I recommend accepting the manuscript.
Comments:
Put a "+" in front of "εNd(t)" when the values >0.

pleased to inform you that I am recommending it for publication with no further corrections required.