Due to the superposition of the Paleo-Pacific and Mongol-Okhotsk tectonic regimes, the dynamic mechanism of the compression and subsequent extension are ambiguous during the Mesozoic. This study documented newly obtained radiometric ages provide robust constraints on the timing of tectonic activity along the Chagan Obo shear zone and the terminal convergence between the North China-Mongolia Siberia continents. In my opinion, the presented data support the aforementioned conclusions to some extent. The organization of the manuscript is OK, the tables, figures and language however need to be modified appropriately. This manuscript will be able to make an interesting contribution to international community if some necessary modifications are made, so presumably suitable for publication in Geological Journal. There are some issues in the manuscript as follows and should be reconsidered and revised:

1. In line 49-51, whether the eastern part of the Central Asian Orogenic Belt is caused by the long-lived subduction of the Paleo Asian Ocean is controversial, so I suggest you put it another way.

2. The characters in Figure 1-2 are inconsistent and need to adjust them.

3. In Figure 9, the direction should be marked.

4. The necessary calculation methods (e.g. (TDM1,87Sr/86Sr)i, Mg#, and δEu) should be attached at the end of the Table 2-3.

5. The language needs to be improved. Before you submit a new copy of the manuscript to a Journal please carefully edit it by someone who is fluent in English.

Comments to the Authors
The authors recognized three NEE-striking zones in central Inner Mongolia and investigated the structural and kinematic characteristics. This study, which used new geochronological and geochemical data of the Carboniferous granitic pluton that outcropped in the Xing’an Block, record late Paleozoic magmatism during the stage of convergence between micro-blocks in eastern Central Asian Orogenic Belt. It provides constraints on their tectonic implications. In my opinion, the presented data support the aforementioned conclusions. The organization of the manuscript is OK, and this manuscript will be able to make an interesting contribution to Geological Journal. Therefore, I recommend that this paper could be considered being accepted to be published on this journal after appropriate modification.
1. There is too much description of Geological Setting section, and it is not necessary to introduce the tectonic evolution process of the Central Asian Orogenic Belt in detail, mainly reflecting the geological setting of the study area.