Dear Dr. Schobben,

Thank you for submitting your manuscript entitled " Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation” [Paper #cp-2017-66] to Climates of the Past. I have now received an assessment of the two reviewers which suggested a major revision, as well as your detailed response to the reviewers concerns.

I share concerns with one reviewer, that delta-13C records may have been also generated by meteoric diagenesis.

Another major concern of the other reviewer is a more detailed description of the diagenetic (reactive transport) model in particular how changes in the carbonate system are considered.

Thus, more discussion on these issues, in accordance with your response letter is required in the revised version.

The feedback provided in the reviewer assessments of your manuscript is important and should be taken into account as you complete your revision. Please include a marked-up manuscript version showing the changes made in your revision. I encourage you to submit a suitably revised version of your manuscript by October, 1, 2017. Please let us know, if you need an extension beyond this deadline.

Sincerely,
Arne Winguth
Editor

Dear Dr. Schobben,

Thank you for addressing the comments raised by the referees in this revision. We are pleased to inform you that your revised manuscript, "Latest Permian carbonate-carbon isotope variability traces heterogeneous organic carbon accumulation and authigenic carbonate formation" [Paper #cp-2017-66], has been accepted for publication in the journal “Climate of the Past”.

Sincerely,

Arne Winguth
Editor