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Distribution of glycerol dialkyl glycerol tetraethers in surface sediments of Lake Qinghai and surrounding soil
Wang, HY (Wang, Huanye)[1,2]; Liu, WG (Liu, Weiguo)[1,3]; Zhang, CLL (Zhang, Chuanlun L.)[4,5]; Wang, Z (Wang, Zheng)[1]; Wang, JX (Wang, Jinxiang)[6]; Liu, ZH (Liu, Zhonghui)[7]; Dong, HL (Dong, Hailiang)[6,8,9]
2012-06-30
Source PublicationORGANIC GEOCHEMISTRY
Volume47Pages:78-87
Subtype期刊论文
Abstract

Glycerol dialkyl glycerol tetraethers (GDGTs) are increasingly used as proxies for paleoclimate studies of marine and lacustrine environments. While GDGT-based proxies have been applied to a number of lake environments globally, little is known about the distribution of GDGTs on the Qinghai-Tibet Plateau. We have investigated the isoprenoid GDGTs (iGDGTs) and branched GDGTs (bGDGTs) in Lake Qinghai sediments and the surrounding surface soil in order to examine their potential use as paleoclimate proxies on the Qinghai-Tibet Plateau. The results show that (i) the values of the iGDGT/bGDGT ratio for surrounding soil were at the higher end among globally distributed soils and consequently BIT values (avg. 0.71) at the lower end, (ii) the TEX86 values decreased while the MBT and CBT values increased along an onshore soil-nearshore sediment-offshore sediment transect, (iii) the TEX86 values for the offshore sediments were almost identical and their inferred temperatures were close to mean summer surface water temperature and (iv) the bGDGT-inferred mean annual air temperature (MAAT) and pH for soil were consistent with measured MAAT and pH. However, the CBT-inferred pH for offshore sediments seemed inconsistent with the pH of lake water or sediment. Our results suggest that (i) the higher pH may be an important factor leading to the higher iGDGT/bGDGT values (and lower BIT values) in surrounding surface soil, (ii) both iGDGTs and bGDGTs may originate from terrestrial input and in situ production for this saline lake, especially for nearshore sediments. However, for offshore sediments, terrestrial iGDGT input seems minor, and TEX86 may be useful for paleoclimate studies of Lake Qinghai.

DOI10.1016/j.orggeochem.2012.03.008
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10113
Collection加速器质谱中心
Corresponding AuthorLiu, WG (Liu, Weiguo)[1,3]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China;
3.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
4.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
5.Department of Marine Sciences, The University of Georgia, Athens, GA 30602, USA;
6.Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China;
7.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;
8.Geomicrobiology Laboratory, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;
9.Department of Geology, Miami University, Oxford, OH 45056, USA
Recommended Citation
GB/T 7714
Wang, HY ,Liu, WG ,Zhang, CLL ,et al. Distribution of glycerol dialkyl glycerol tetraethers in surface sediments of Lake Qinghai and surrounding soil[J]. ORGANIC GEOCHEMISTRY,2012,47:78-87.
APA Wang, HY .,Liu, WG .,Zhang, CLL .,Wang, Z .,Wang, JX .,...&Dong, HL .(2012).Distribution of glycerol dialkyl glycerol tetraethers in surface sediments of Lake Qinghai and surrounding soil.ORGANIC GEOCHEMISTRY,47,78-87.
MLA Wang, HY ,et al."Distribution of glycerol dialkyl glycerol tetraethers in surface sediments of Lake Qinghai and surrounding soil".ORGANIC GEOCHEMISTRY 47(2012):78-87.
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