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Sample-scale carbon isotopic variability and diverse biomass in the Paleoproterozoic Zaonega Formation, Russia
Yuangao Qu1,2,3; Aivo Lepland4; Mark A. van Zuilen5; Martin Whitehouse; Alenka E. Črne; Anthony E. Fallick
2018-09
Source PublicationPrecambrian Research
Volume315Issue:2018Pages:222-231
Abstract

The stratigraphic record of organic matter in the c. 1.97 Ga Zaonega Formation (ZF), Onega Basin, northwestern Russia, exhibits a distinct negative δ13C excursion (δ13Corg from −25 to −40‰ VPDB), which was previously interpreted either to reflect a disturbance in the global carbon cycle after the Great Oxidation Event, or to have been caused by an increase in basinal methanotrophic activity. In order to assess the nature of primary biomass and the effects of post-depositional alteration, we here report the sample-scale carbon isotopic characteristics of organic matter in two drill cores from the ZF, covering 500 m of stratigraphy, by using secondary ion mass spectrometry (SIMS). The results confirm that the organic matter has to a large extent preserved the primary isotopic signatures, whereas secondary effects are limited (<4‰). The sample-scale isotopic heterogeneity, defined as the difference between the maximum and minimum δ13C values obtained by SIMS from every individual sample, increases from typically <5‰ in the lower part of stratigraphy to systematically larger values (up to 11‰) in the upper part, which coincides with the decreasing trend of δ13Corg of bulk samples from −25 to −40‰. Samples with either relatively high (c. −25‰) or low (c. −40‰) δ13Corg values have small sample-scale isotopic heterogeneities, while samples with intermediate δ13Corg values (between −25 and −40‰) have significantly larger heterogeneities. These observations imply the co-existence of photoautotrophic and methanotrophic biomass during deposition of the upper part of the stratigraphy. Our study provides insight into the carbon isotopic characteristics of organic matter and suggests that the negative excursion of δ13Corg in the ZF is induced by a methanotrophic microbial ecosystem sustained by seepage of thermogenic methane during the deposition of the ZF and contemporaneous igneous activities.

KeywordZaonega Formation Organic Matter Carbon Isotope Methanotrophy Sims
DOIhttps://doi.org/10.1016/j.precamres.2018.07.008
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Indexed BySCI
Language英语
WOS IDWOS:000445165800013
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/5976
Collection深海科学研究部_地外海洋系统研究室
Corresponding AuthorAivo Lepland
Affiliation1.a Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, China
2.Department of Paleobiology, Department of Geosciences, Swedish Museum of Natural History, Sweden
3.c Centre for Geobiology, Department of Earth Sciences, University of Bergen, Norway
4.Geological Survey of Norway, Norway
5.e Equipe Géomicrobiologie, Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, Paris, France
Recommended Citation
GB/T 7714
Yuangao Qu,Aivo Lepland,Mark A. van Zuilen,et al. Sample-scale carbon isotopic variability and diverse biomass in the Paleoproterozoic Zaonega Formation, Russia[J]. Precambrian Research,2018,315(2018):222-231.
APA Yuangao Qu,Aivo Lepland,Mark A. van Zuilen,Martin Whitehouse,Alenka E. Črne,&Anthony E. Fallick.(2018).Sample-scale carbon isotopic variability and diverse biomass in the Paleoproterozoic Zaonega Formation, Russia.Precambrian Research,315(2018),222-231.
MLA Yuangao Qu,et al."Sample-scale carbon isotopic variability and diverse biomass in the Paleoproterozoic Zaonega Formation, Russia".Precambrian Research 315.2018(2018):222-231.
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