| DOI: | 10.1016/j.earscirev.2020.103499
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| 论文题名: | Coupling of paleoenvironment and biogeochemistry of deep-time alkaline lakes: A lipid biomarker perspective |
| 作者: | Xia L.; Cao J.; Hu W.; Zhi D.; Tang Y.; Li E.; He W.
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| 刊名: | Earth Science Reviews
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| ISSN: | 00128252
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| 出版年: | 2021
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| 卷: | 213 | | 语种: | 英语
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| 中文关键词: | Alkali mineral
; Ancient alkaline lake
; Biological composition
; Halotolerant green algae
; Photic zone euxinia
; Sedimentary environment
; δ15N
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| 英文关键词: | alkaline water
; biogeochemistry
; biomarker
; depositional environment
; green alga
; lacustrine deposit
; lake water
; limnology
; lipid
; paleoenvironment
; photic zone
; Chlorophyta
; Cyanobacteria
; Embryophyta
; Proteobacteria
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| 英文摘要: | Studies of alkaline lakes have critical biological–environmental–economic properties, but deep-time alkaline lakes are challenging to investigate. Lipid biomarkers can provide valuable insights into such lakes and their biogeochemical significance. This paper reviews and compares typical examples of ancient alkaline lakes across the world. Lipid biomarker evidences, including C30-steranes, Pr/Ph, Pr/n-C17-Ph/n-C18, (β − +γ-carotane)/n-Cmax, and gammacerane/C30αβH values, suggest these alkaline lakes were reducing, hypersaline, and stratified. The n-alkanes, steranes/hopanes, C28-St/C27–29-St%, and C28/C29-St values indicate that the preserved biomass of the alkaline lakes were dominated by algae and bacteria, with less input from higher plants. The algae were mainly halotolerant green algae, rather than cyanobacteria. The different alkaline lakes have some subtle differences in their sedimentary environments. The paleoenvironmental setting and biomass of the alkaline lakes co-vary systematically. The ratio of algae/bacteria is positively correlated with increasingly reducing and saline conditions, because the increase in salinity improves the competitiveness of halotolerant green algae. The changes in these extreme alkaline environments are too small to cause obvious variations in the proportion of green algae/total algae, and the abundance of cyanobacteria, photoautotrophs, and/or type I methanotrophic proteobacteria. Lipid biomarker data show that the primary controlling factor on the biomass of saline and alkaline lakes is their geologic age and, to a lesser extent, their salinity. The abundance of organic matter in these sediments varies greatly, and the types of organic matter are generally good for hydrocarbon generation. The formation of oil and gas is controlled by factors such as abundance of organic matter, thermal maturity, size of lake basin, and thickness of the organic-rich sediments. © 2020 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/166540
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| Appears in Collections: | 气候变化与战略
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作者单位: | MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China; PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
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| Recommended Citation: | |
Xia L.,Cao J.,Hu W.,et al. Coupling of paleoenvironment and biogeochemistry of deep-time alkaline lakes: A lipid biomarker perspective[J]. Earth Science Reviews,2021-01-01,213
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