Dear Fanis Abdullin,

Thank you for the detailed responses provided. Based on your responses to the generally minor points raised by the two reviewers, I trust that you can implement the required changes as outlined in your response. I particularly urge you to scrutinze English grammar; the original submission had quite a few weaknesses in this regard. Looking forward to the revised version.

Regards,

Axel Schmitt

Dear authors,

Please consider the stylistic and grammatical corrections and suggestions in the attached document for your resubmission. This will not require further review by the referees.

Regards,

Axel Schmitt

Dear authors,

There is still a minor language issue in that it should be either "by the U-Pb method" or "by U-Pb methods" (when referring to different methodologies).

Please check carefully and correct where needed.

Otherwise I agree with publication.

Regards,

Axel Schmitt

Dear Dr. Abdullin
thank your for submitting a revised version of your paper. It is now acceptable for for publication subject to very minor corrections.
Fig 4: please write isotopes properly. It is not Pb-207, it is 207(as superscript)Pb. The same for all other isotopes.
Minor corrections in the text:
L 1 delete „on“
11 the U-Pb method
L 44 small, not smaller

With kind regards
KLaus Mezger