Element Mobility in a Metasomatic System with IOCG Mineralization Metamorphosed at Granulite Facies: The Bondy Gneiss Complex, Grenville Province, Canada

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

This paper characterizes the chemical signature of the metamorphosed metasomatic lithotypes of the BGC of the southwest Grenville Province and validates the MIAC ore system model for its mineral exploration. On the whole it is a well-prepared paper containing abundant data. I suggest accepting it pending minor revision.

 

Abstract: at the beginning of the abstract, the authors need to address what is the scientific issues in the study area, and why the authors need to carry out such a study.

 

Abstract some of the analysis you have done, but not mentioned in the abstract. You should mention all your analysis and some important results in the abstract.

 

Fig. 6 need Symbols explanation in the figure.

 

7.1. Implications for Exploration Targeting in High-grade Metamorphic Terranes: need a figure to show where is the targets.

Author Response

Dear reviewer,
Thank you for your review and constructive comments. We have met your expectations.

Abstract: at the beginning of the abstract, the authors need to address what is the scientific issues in the study area, and why the authors need to carry out such a study.

We have modified the beginning of the introduction to address the challenges of exploration in high-grade metamorphic terrane.

Abstract some of the analysis you have done, but not mentioned in the abstract. You should mention all your analysis and some important results in the abstract.

We mention in the abstract that the geochemical analyses first confirm the mineralogical observations suggesting the existence of pre-metamorphic hydrothermal alteration. Second, they highlight significant mobility of rare earth elements.

Fig. 6 need Symbols explanation in the figure.

Explanation of symbols has been added to Figure 6

7.1. Implications for Exploration Targeting in High-grade Metamorphic Terranes: need a figure to show where is the targets.

This title seems to be misinterpreted. We've changed it to: “Implications for Exploration Campaigns in High-grade Metamorphic Terranes”

best regards

Olivier Blein

Reviewer 2 Report

Comments and Suggestions for Authors

I have a (very) few comments and 1 question plus I have found a couple of typos.

Here they are:

Line 54: an original protoliths

Line 136: What is the age of the Shawinigan Orogeny? What is the relation of it to Labradorian or Pinwarian Orogeny?

Figure 1A: some geographic references would be nice or a small inset map of Canada with the area highlighted.

Line 176 and Figure 2: Where is the aluminous lithofacies on Figure 2?

Line 192: consists

Line 213-216: Discoveries….significantly improves

Line 224: grain, add -ed

Line 236: increase systematically asymmetrically systematically? Something is missing here

Line 261: delete ‘thermal’, retrogression is enough

Line 281: if you think magnetite is igneous, anhedral is the right textural term, otherwise use xenomorphic

Line 360: Major elements are better than…I think “analytical precision” is missing here

Author Response

Dear reviewer,
Thank you for your review and constructive comments. We have met your expectations.

Line 54: an original protoliths

corrected

Line 136: What is the age of the Shawinigan Orogeny? What is the relation of it to Labradorian or Pinwarian Orogeny?

We have specified the age of the Shawinigan orogen and its relationships with the Labradorian and Pinwarian orogens.

Figure 1A: some geographic references would be nice or a small inset map of Canada with the area highlighted.

We added the border between Canada and the USA

Line 176 and Figure 2: Where is the aluminous lithofacies on Figure 2?

We have corrected the legend

Line 192: consists

Corrected

Line 213-216: Discoveries….significantly improves

Corrected

Line 224: grain, add -ed

Corrected

Line 236: increase systematically asymmetrically systematically? Something is missing here

Corrected

Line 261: delete ‘thermal’, retrogression is enough

Corrected

Line 281: if you think magnetite is igneous, anhedral is the right textural term, otherwise use xenomorphic

Corrected

Line 360: Major elements are better than…I think “analytical precision” is missing here

Corrected

best regards

Olivier Blein

Reviewer 3 Report

Comments and Suggestions for Authors

The MS is well and formulated but would like to mention here that the petrography part of this study is too lengthy. So, I suggest that the text should be edited (concise) with few Photomicrographs of the study.

Author Response

Dear reviewer,
Thank you for your review and constructive comments. We have met your expectations.

The MS is well and formulated but would like to mention here that the petrography part of this study is too lengthy. So, I suggest that the text should be edited (concise) with few Photomicrographs of the study.

We have shortened the petrographic section and added photographs to illustrate the main facies of the high-grade metamorphosed hydrothermal system.

best regards

Olivier Blein