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Effect of in-stream physicochemical processes on the seasonal variations in delta C-13 and delta O-18 values in laminated travertine deposits in a mountain stream channel
Hao Yan;  Zaihua Liu;  Hailong Sun
2017
Source PublicationGeochimica et Cosmochimica Acta
Volume202Pages:179-189
Abstract

Travertines are potential archives of continental paleoclimate. Records of stable carbon and oxygen isotopic composition (delta C-13 and delta O-18) in laminated travertine deposits from endogene spring waters show regular cyclic patterns which may be due to seasonal change in climate determinants such as temperature and rainfall. In this study, delta C-13 and delta O-18 measurements of three travertine specimens that grew naturally over the eight years, 2004-2011, at upstream, middle and downstream sites in a canal at Baishuitai, SW China, are presented. They exhibit clear seasonal variations that generally correlate with biannual laminations. Specifically, delta C-13 and delta O-18 values show significant positive correlation with each other for the three travertine specimens, with the correlation coefficients increasing downstream along the canal. To reveal the factors governing the seasonal and spatial variations in delta C-13 and delta O-18 values, newly formed travertines precipitated on Plexiglas substrates are also examined. Both delta C-13 and delta O-18 of the substrate travertines are low in the summer/rainy season and high in the winter/dry season, showing a great consistency with the patterns in the natural travertines. Spatially, isotope values increase downstream in both seasons, with higher increase rates in winter that are related to removal of larger fractions of dissolved inorganic carbon (DIC) from the solution and stronger kinetic isotopic fractionation in winter. Due to in-stream physicochemical processes, including CaCO3 precipitation and the associated degassing of CO2, seasonal changes in delta C-13 and delta O-18 in the travertines are amplified by two times between the upstream and downstream sites: this is opposite to trends for epigene (meteogene) tufas whose seasonal changes in stable isotope compositions are reduced downstream. We suggest in-stream physicochemical processes are a potential reason for underestimation of annual temperature ranges that are inferred from epigene tufa delta O-18 data.

KeywordTravertine Stable Isotopes Kinetic Isotopic Fractionation Paleoclimate Baishuitai
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7765
Collection环境地球化学国家重点实验室
AffiliationState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Hao Yan;Zaihua Liu;Hailong Sun. Effect of in-stream physicochemical processes on the seasonal variations in delta C-13 and delta O-18 values in laminated travertine deposits in a mountain stream channel[J]. Geochimica et Cosmochimica Acta,2017,202:179-189.
APA Hao Yan;Zaihua Liu;Hailong Sun.(2017).Effect of in-stream physicochemical processes on the seasonal variations in delta C-13 and delta O-18 values in laminated travertine deposits in a mountain stream channel.Geochimica et Cosmochimica Acta,202,179-189.
MLA Hao Yan;Zaihua Liu;Hailong Sun."Effect of in-stream physicochemical processes on the seasonal variations in delta C-13 and delta O-18 values in laminated travertine deposits in a mountain stream channel".Geochimica et Cosmochimica Acta 202(2017):179-189.
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