NDLI: Aquatic species dominate organic matter in Qinghai Lake during the Holocene: Evidence from eolian deposits around the lake

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Aquatic species dominate organic matter in Qinghai Lake during the Holocene: Evidence from eolian deposits around the lake

Content Provider	Springer Nature Link
Author	Zeng, Fangming Liu, Xiangjun Li, Xiangzhong
Copyright Year	2017
Abstract	Total organic carbon (TOC) in lake sediments and its stable carbon isotope (δ$^{13}$C$_{org}$) are widely applied to investigate paleoenvironmental changes even though their implications are complicated and multi-explanatory. Organic geochemistry studies of lake sediments from Qinghai Lake have been investigated, but some interpretations are controversial. In this study, TOC of one Holocene eolian section and δ$^{13}$C$_{org}$ of three eolian sections were studied around Qinghai Lake. Results indicate that the TOC content in eolian deposits was low during the Early Holocene, and gradually increased to high values during the Middle and Late Holocene. The variation in TOC content of eolian deposits is different from that in the lacustrine sequence from Qinghai Lake during the Holocene. The δ$^{13}$C$_{org}$ values in the eolian sections were relatively stable, with oscillation amplitudes of ~4‰ (ranging from -25.8‰ to -22.1‰), in contrast to ~10‰ variations in δ$^{13}$C$_{org}$ values (varying from -30‰ to -20‰) in lacustrine sediments. Through comparison of TOC and δ$^{13}$C$_{org}$ values between eolian deposits and lacustrine sediments, we can confirm indications that the organic matter in Qinghai Lake sediments during the Holocene was primarily a contribution of the aquatic species in the lake. This is significant for understanding the origin of organic matter in lake sediments on the northeastern Qinghai-Tibetan Plateau and for paleoenvironmental inferences using such proxies.
Starting Page	484
Ending Page	491
Page Count	8
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	28
Issue Number	3
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2017-06-10
Publisher Place	Wuhan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Qinghai Lake total organic carbon (TOC) organic carbon isotope (δ$^{13}$C$_{org}$) Qinghai- Tibetan Plateau Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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