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Environmental controls on long-chain alkenone occurrence and compositional patterns in lacustrine sediments, northwestern China
Song, Mu1; Zhou, Aifeng2; He, Yuxin1,3; Zhao, Cheng1,4; Wu, Jinglu4; Zhao, Yan2; Liu, Weiguo5; Liu, Zhonghui1
2016
Source PublicationORGANIC GEOCHEMISTRY
Volume91Issue:2016Pages:43-53
SubtypeArticle
AbstractLong chain alkenones occur widely in lacustrine settings and their compositions are potential proxies for reconstructing terrestrial paleoclimatological and paleoenvironmental changes. However, factors influencing their occurrence, abundance, compositional pattern and unsaturation indices are not well understood. Here we investigated the alkenones in surface sediments from 19 lakes in northwestern China as well as potential environmental factors. Of the lakes, 12 contain long chain alkenones, 3 have the isomeric C-37:3 alkenone and 3 have very low abundance of alkenones. Our results show that salinity has a substantial influence on the occurrence, concentration and compositional pattern. Most of the compositions are dominated by tri-unsaturated compounds, with C-38 methyl ketones absent. The predominance of C-37:4 and the occurrence of a C-37:3 isomer are suggested to be responses to low salinity as both are only found in the three alkenone-containing freshwater lakes. The proportion of C-37:4 varies by up to 50% and shows a negative relationship with salinity within the surveyed region. An arched relationship of alkenone content and salinity is apparent, with no or very low contents of alkenones in freshwater (salinity < 3 g/L) and hypersaline (> 100 g/L) environments. The U-37(K') index is suggested to be a better terrestrial temperature proxy than U-37(K) as U-37(K') values from lakes containing elevated alkenone content are all within the ranges of published U-37(K')-temperature calibrations, and U-37(K) values show a weak positive relationship with salinity. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordAlkenones Salinity Temperature Lacustrine Settings Northwestern China Lakes
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.orggeochem.2015.10.009
WOS KeywordHAPTOPHYTE EMILIANIA-HUXLEYI ; NORTHERN TIBETAN PLATEAU ; GEPHYROCAPSA-OCEANICA ; LAKE-SEDIMENTS ; UNSATURATION RATIO ; GROWTH TEMPERATURE ; MICROBIAL MATS ; ACE LAKE ; DISTRIBUTIONS ; DEGRADATION
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000366706100005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5863
Collection加速器质谱中心
Affiliation1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
2.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China
3.Zhejiang Univ, Dept Earth Sci, Hangzhou 310058, Zhejiang, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China
5.Chinese Acad Sci, IEE, State Key Lab Loess & Quaternary Geol, Xian 0075, Peoples R China
Recommended Citation
GB/T 7714
Song, Mu,Zhou, Aifeng,He, Yuxin,et al. Environmental controls on long-chain alkenone occurrence and compositional patterns in lacustrine sediments, northwestern China[J]. ORGANIC GEOCHEMISTRY,2016,91(2016):43-53.
APA Song, Mu.,Zhou, Aifeng.,He, Yuxin.,Zhao, Cheng.,Wu, Jinglu.,...&Liu, Zhonghui.(2016).Environmental controls on long-chain alkenone occurrence and compositional patterns in lacustrine sediments, northwestern China.ORGANIC GEOCHEMISTRY,91(2016),43-53.
MLA Song, Mu,et al."Environmental controls on long-chain alkenone occurrence and compositional patterns in lacustrine sediments, northwestern China".ORGANIC GEOCHEMISTRY 91.2016(2016):43-53.
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