Five series of benzohopanes in early Cretaceous sediments from the Chaoyang Basin, NE China

Lian Jiang; Li Li; Hans P. Nytoft; Yunpeng Wang; Simon C. George

doi:10.1016/j.orggeochem.2024.104843

Five series of benzohopanes in early Cretaceous sediments from the Chaoyang Basin, NE China

Lian Jiang^*, Li Li, Hans P. Nytoft, Yunpeng Wang, Simon C. George

^*Corresponding author for this work

School of Natural Sciences

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Abstract

Five series of benzohopanes were identified in a set of immature to early-oil-window early Cretaceous sediments from the ZK1006 well, Chaoyang Basin, NE China. Series a (C₃₁-C₃₅), b (C₃₃-C₃₅), and c (C₃₁-C₃₅) benzohopanes form by different pathways, while the newly-found series d (C₃₁-C₃₄, maybe to C₃₅?) and e (C₃₁-C₃₂, maybe to C₃₅?) benzohopanes have similar formation mechanisms. Series a is usually the predominant benzohopane series, but occasionally samples are dominated by series c benzohopanes. Series b benzohopanes may be associated with terrigenous organic matter. Series a and b benzohopanes are possibly influenced by redox properties, while paleosalinity more likely controls the formation and enrichment of series c benzohopanes. Two novel parameters (a benzohopane index, and the C₃₅/C₃₄ benzohopane ratio) are proposed to be useful paleoenvironmental proxies in the study area. A high benzohopane index and C₃₅/C₃₄ benzohopane ratio may indicate an anoxic environment.

Original language	English
Article number	104843
Pages (from-to)	1-12
Number of pages	12
Journal	Organic Geochemistry
Volume	195
Early online date	1 Aug 2024
DOIs	https://doi.org/10.1016/j.orggeochem.2024.104843
Publication status	Published - Sept 2024

Bibliographical note

Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

Benzohopanes
Chaoyang Basin
Jiufotang Formation
Lacustrine sediments
Oil shale

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10.1016/j.orggeochem.2024.104843

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title = "Five series of benzohopanes in early Cretaceous sediments from the Chaoyang Basin, NE China",

abstract = "Five series of benzohopanes were identified in a set of immature to early-oil-window early Cretaceous sediments from the ZK1006 well, Chaoyang Basin, NE China. Series a (C31-C35), b (C33-C35), and c (C31-C35) benzohopanes form by different pathways, while the newly-found series d (C31-C34, maybe to C35?) and e (C31-C32, maybe to C35?) benzohopanes have similar formation mechanisms. Series a is usually the predominant benzohopane series, but occasionally samples are dominated by series c benzohopanes. Series b benzohopanes may be associated with terrigenous organic matter. Series a and b benzohopanes are possibly influenced by redox properties, while paleosalinity more likely controls the formation and enrichment of series c benzohopanes. Two novel parameters (a benzohopane index, and the C35/C34 benzohopane ratio) are proposed to be useful paleoenvironmental proxies in the study area. A high benzohopane index and C35/C34 benzohopane ratio may indicate an anoxic environment.",

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author = "Lian Jiang and Li Li and Nytoft, {Hans P.} and Yunpeng Wang and George, {Simon C.}",

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AU - Jiang, Lian

AU - Li, Li

AU - Nytoft, Hans P.

AU - Wang, Yunpeng

AU - George, Simon C.

N1 - Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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N2 - Five series of benzohopanes were identified in a set of immature to early-oil-window early Cretaceous sediments from the ZK1006 well, Chaoyang Basin, NE China. Series a (C31-C35), b (C33-C35), and c (C31-C35) benzohopanes form by different pathways, while the newly-found series d (C31-C34, maybe to C35?) and e (C31-C32, maybe to C35?) benzohopanes have similar formation mechanisms. Series a is usually the predominant benzohopane series, but occasionally samples are dominated by series c benzohopanes. Series b benzohopanes may be associated with terrigenous organic matter. Series a and b benzohopanes are possibly influenced by redox properties, while paleosalinity more likely controls the formation and enrichment of series c benzohopanes. Two novel parameters (a benzohopane index, and the C35/C34 benzohopane ratio) are proposed to be useful paleoenvironmental proxies in the study area. A high benzohopane index and C35/C34 benzohopane ratio may indicate an anoxic environment.

AB - Five series of benzohopanes were identified in a set of immature to early-oil-window early Cretaceous sediments from the ZK1006 well, Chaoyang Basin, NE China. Series a (C31-C35), b (C33-C35), and c (C31-C35) benzohopanes form by different pathways, while the newly-found series d (C31-C34, maybe to C35?) and e (C31-C32, maybe to C35?) benzohopanes have similar formation mechanisms. Series a is usually the predominant benzohopane series, but occasionally samples are dominated by series c benzohopanes. Series b benzohopanes may be associated with terrigenous organic matter. Series a and b benzohopanes are possibly influenced by redox properties, while paleosalinity more likely controls the formation and enrichment of series c benzohopanes. Two novel parameters (a benzohopane index, and the C35/C34 benzohopane ratio) are proposed to be useful paleoenvironmental proxies in the study area. A high benzohopane index and C35/C34 benzohopane ratio may indicate an anoxic environment.

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KW - Jiufotang Formation

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Five series of benzohopanes in early Cretaceous sediments from the Chaoyang Basin, NE China

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