Journal Pre-proofs Distribution and carbon isotope composition of pregnane in carbonate-evapor- itic rocks from the Bonan Sag, Bohai Bay Basin, Eastern China: Insights into sources and associated lake environments Yongdong Zhang, Yongge Sun, Qin Liu PII: S0146-6380(20)30162-5 DOI: https://doi.org/10.1016/j.orggeochem.2020.104127 Reference: OG 104127 To appear in: Organic Geochemistry Received Date: 14 July 2020 Revised Date: 9 September 2020 Accepted Date: 16 September 2020 Please cite this article as: Zhang, Y., Sun, Y., Liu, Q., Distribution and carbon isotope composition of pregnane in carbonate-evaporitic rocks from the Bonan Sag, Bohai Bay Basin, Eastern China: Insights into sources and associated lake environments, Organic Geochemistry (2020), doi: https://doi.org/10.1016/j.orggeochem. 2020.104127 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Elsevier Ltd. All rights reserved.