干旱区生态环境知识资源中心(Arid): Hydrochemical and isotopic characteristics of water sources for biological activity across a massive evaporite basin on the Tibetan Plateau: Implications for aquatic environments on early Mars

Arid

DOI	10.1016/j.scitotenv.2024.173442
	Hydrochemical and isotopic characteristics of water sources for biological activity across a massive evaporite basin on the Tibetan Plateau: Implications for aquatic environments on early Mars
	Shen, Jianxun; Huang, Tianming; Zhang, Huiqing; Lin, Wei
通讯作者	Lin, W
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	935
英文摘要	Covered by vast eolian landforms, gravel deposits, and playas, the worldwide typical evaporite deposit land, Qaidam Basin, in northwestern China is analogous to early Mars when the aridification process had lasted for millions of years since the end of a wetter climate. This study aims to investigate the chemical and isotopic characteristics of waters in an evaporite-rich environment, as well as the habitable conditions therein, that have undergone a transformation similar to early Mars. In May 2023, a total of 26 water samples were collected across the representative central axis of a longitudinal aridity gradient in the Qaidam Basin, including categories of meteoric water, freshwater, standing water accumulated after precipitation, salty lacustrine water, and hypersaline brines to inspect compounds made up of carbon, nitrogen, phosphorus, sulfur, halogen, and metallic elements. As evaporation intensified, the salt types transformed from HCO3-Ca center dot Na to Cl center dot SO4-Na or Cl-Mg. The dominance of carbonate will gradually be replaced by sulfate and chloride, leaving much more dilute and less detectable contents. The presence of trace ClO4, ClO3, ClO2, and BrO3 was confirmed in a few of the sampled Qaidam waters, indicating the preservation of oxyhalides in waters within an arid region and possibly the presence of relevant microbial enzymes. The isotopes of water, carbonaceous, and nitrogenous compounds provide valuable references for either abiogenic or biogenic signatures. With undetectable amount, phosphorus was found to be the limiting nutrient in evaporative aquatic environments but not necessarily antibiosignatures. Overall, these results suggest that the paleo-lacustrine environments on Mars are more likely to preserve biosignatures if they feature the dominance of carbonate minerals, bioavailable nitrate, phosphorus, and organic carbon, the presence of thermodynamically unstable oxyhalides, and isotope ratios that point to the involvement of biological activity.
英文关键词	Qaidam water Hydrogeochemistry Dissolved carbon Nitrate Oxyhalide Isotopic biosignature
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001246134200001
WOS关键词	WESTERN QAIDAM BASIN ; ATACAMA DESERT ; CLIMATE-CHANGE ; TRIPLE OXYGEN ; NITRATE ; ANALOGS ; EVOLUTION ; NITROGEN ; BIOSIGNATURES ; DECOMPOSITION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405505
推荐引用方式 GB/T 7714	Shen, Jianxun,Huang, Tianming,Zhang, Huiqing,et al. Hydrochemical and isotopic characteristics of water sources for biological activity across a massive evaporite basin on the Tibetan Plateau: Implications for aquatic environments on early Mars[J],2024,935.
APA	Shen, Jianxun,Huang, Tianming,Zhang, Huiqing,&Lin, Wei.(2024).Hydrochemical and isotopic characteristics of water sources for biological activity across a massive evaporite basin on the Tibetan Plateau: Implications for aquatic environments on early Mars.SCIENCE OF THE TOTAL ENVIRONMENT,935.
MLA	Shen, Jianxun,et al."Hydrochemical and isotopic characteristics of water sources for biological activity across a massive evaporite basin on the Tibetan Plateau: Implications for aquatic environments on early Mars".SCIENCE OF THE TOTAL ENVIRONMENT 935(2024).