NDLI: Branched aliphatic alkanes of shell bar section in Qarhan Lake, Qaidam Basin and their paleoclimate significance

Content Provider	Springer Nature Link
Author	Zhang, HuCai Chang, FengQin Li, Bin Lei, GuoLiang Chen, Yue Zhang, WenXiang Niu, Jie Fan, HongFang Yang, MingSheng
Copyright Year	2007
Abstract	Biomarkers of paleolake deposits from Qarhan Salt Lake in Qaidam Basin, northwest China were systematically analyzed and the A–C series compounds of branched aliphatic alkanes with quaternary substituted carbon atom (BAQCs) were identified. The homologous distinguished three series, A–C, were identified as 5,5-diethylalkanes, 6,6-diethylalkanes and 5-butyl, 5-ethylalkanes series, and their relative abundance was A > B > C. Series A and C were characterized by odd carbon numbers, whereas series B was characterized by even carbon numbers. The high values of series A corresponded with the high values of series B and C. Therefore, it can be concluded that series A, B and C possess a similar biological origin. The abundance of series A was relatively low in the lower part of the section compared with that in the upper part, implying that these series originated from bacteria and/or algae more prevalent in fresh-mesohaline water, and such kinds of bacteria and/or algae are most likely to be thermophilous species. The A25/nC$_{25}$ ratio differences in the section show that such branched aliphatic alkanes can be treated as one kind of environmental change proxy for paleolake evolution and may provide important information for the climate reconstruction of the Late Pleistocene.
Starting Page	1248
Ending Page	1256
Page Count	9
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	52
Issue Number	9
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Qaidam Basin shell bar section branched aliphatic alkanes paleoenvironment Science Physics Chemistry/Food Science Life Sciences Geosciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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