Wet-dry seasonal variations of hydrochemistry and carbonate precipitation rates in a travertine-depositing canal at Baishuitai, Yunnan, SW China: Implications for the formation of biannual laminae in | |
Zaihua Liu; Hailong Sun; Lu Baoying; Liu Xiangling; Ye Wenbing; Zeng Cheng | |
2010 | |
发表期刊 | Chemical Geology
![]() |
卷号 | 273期号:3–4页码:258-266 |
摘要 | Biannually laminated freshwater carbonate deposits (tufas and travertines) are potential sources of high-resolution terrestrial paleoclimate data. In order to understand the processes of carbonate precipitation, the formation of the biannual laminae in endogenic (thermogene) travertine, and the characteristics of the climate information recorded in them, the seasonal variations of hydrochemistry and carbonate precipitation rates in a travertine-depositing canal at Baishuitai, Yunnan, SW China were investigated. Plexiglass substrates (5 cm × 5 cm × 0.5 cm) for carbonate collection were placed in the flowing water at ten sampling sites in the canal and replaced semimonthly for one hydrological year, to determine the rates of carbonate precipitation. Water temperature, pH and specific conductivity at these sampling sites were measured daily in situ throughout the year. From these data the concentrations of Ca2+, HCO3−, the calcite saturation index and CO2 partial pressure were derived. The hydrochemistry and rate of carbonate precipitation at all sites displayed the same clear seasonal pattern, lower in the warm rainy season and higher in the cold dry season. The lower solute chemical concentrations and carbonate precipitation rates in the rainy season were due to the dilution of ground water concentrations by overland flow after rainfall. The endogenic travertine had much clearer biannual lamination structure than is normal in the epigenic tufa in Japan. The lamina consisted of a thin dark porous warm-rainy-season layer alternating with a thick light dense cold-dry-season layer: in contrast, a thick, dark and dense summer–autumn layer alternates with a thin, light and porous winter–spring layer in any biannual lamina found in normal epigenic tufa that is controlled mainly by the change of temperature and CO2. The biannual lamination in the thermogene travertine was primarily controlled by changes in the dilution-dominated carbonate precipitation rate, the darker color of the warm-rainy-season layer being due to soil-derived clay and organic matter introduced by the overland flow. This study thus demonstrates that rates of carbonate precipitation and the formation of lamination in the travertine at Baishuitai were controlled chiefly by a climatic factor (rainfall), which has implications for using the fossil travertine at the site to reconstruct the climate in the past. Additionally, it shows that differences in rate-controlling mechanisms of carbonate precipitation must be considered when using epigenic tufa and endogenic travertine to reconstruct the paleoclimate and paleoenvironmental parameters (temperature + CO2 vs. rainfall). |
关键词 | Hydrochemistry carbonate Precipitation Rate seasonal Variation dilution Effect endogenic Travertine biannual Lamination paleoclimatic Implication baishuitai, Yunnan, Sw China |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/9511 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 46 Guanshui road, Guiyang 550002, China 2.Karst Dynamics Laboratory, Institute of Karst Geology, Chinese Academy of Geological Sciences, 50 Qixing Road, Guilin 541004, China |
推荐引用方式 GB/T 7714 | Zaihua Liu;Hailong Sun;Lu Baoying;Liu Xiangling;Ye Wenbing;Zeng Cheng. Wet-dry seasonal variations of hydrochemistry and carbonate precipitation rates in a travertine-depositing canal at Baishuitai, Yunnan, SW China: Implications for the formation of biannual laminae in[J]. Chemical Geology,2010,273(3–4):258-266. |
APA | Zaihua Liu;Hailong Sun;Lu Baoying;Liu Xiangling;Ye Wenbing;Zeng Cheng.(2010).Wet-dry seasonal variations of hydrochemistry and carbonate precipitation rates in a travertine-depositing canal at Baishuitai, Yunnan, SW China: Implications for the formation of biannual laminae in.Chemical Geology,273(3–4),258-266. |
MLA | Zaihua Liu;Hailong Sun;Lu Baoying;Liu Xiangling;Ye Wenbing;Zeng Cheng."Wet-dry seasonal variations of hydrochemistry and carbonate precipitation rates in a travertine-depositing canal at Baishuitai, Yunnan, SW China: Implications for the formation of biannual laminae in".Chemical Geology 273.3–4(2010):258-266. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Wet-dry seasonal var(1779KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论