Hydrochemical and isotope characteristics of spring water and travertine;in the Baishuitai area (SW China) and their meaning for;paleoenvironmental reconstruction

doi:10.1007/s00254-003-0811-4

CORC > 中国地质调查局 > 中国地质调查局

	Hydrochemical and isotope characteristics of spring water and travertine;in the Baishuitai area (SW China) and their meaning for;paleoenvironmental reconstruction
	Liu, Z 4; Zhang, M ; Li, Q ; You, S
刊名	ENVIRONMENTAL GEOLOGY
	2003
卷号	44 期号:6 页码:698-704
关键词	hydrochemistry stable carbon and oxygen isotopes endogenic CO2 sources endogene travertine paleoenvironment reconstruction Baishuitai, Yunnan Province, SW China
ISSN号	0943-0105
DOI	10.1007/s00254-003-0811-4
英文摘要	A method of combining hydrochemical data logging and in situ titrating with measurement of stable carbon and oxygen isotopes was used to reveal the hydrochemical and isotopic characteristics in the Baishuitai travertine scenic area of SW China. It was found that the travertine-forming springs have a very high concentration of calcium and bicarbonate, and accordingly very high CO2 partial pressures, which are not likely to be produced by biological activity in soil alone. Further analysis of the stable carbon isotopes of the springs shows that the high pressure of CO2 is mainly related to an endogenic CO2 source. That means the Baishuitai travertine is endogenic in origin. This is contrast to the commonly accepted saying that the travertine deposition in this study simply is a product of warm and humid conditions in a karst ecological environment. Rapid CO2 degassing from the water is triggered by the much higher partial pressures in water than that of the surrounding air. Consequently, as the waters flow downstream of the spring the pH increases, the waters become supersaturated with respect to calcite, and travertine is deposited. The preferential release of (CO2)-C-12 to the atmosphere results in a progressive increase of travertine delta(13)C downstream. This is concluded with a preliminary discussion of variation in travertine-forming water temperatures, according to differences in stable oxygen isotopic compositions of the travertine formed in different epochs at Baishuitai. It was found that the change in water temperature is as high as 13 degreesC, i.e., from 23 degreesC at about 2500 years B.P., to 10 degreesC at present. This may mainly reflect that the effect of geothermal source on water temperature is decreasing. The problems involved in paleoenvironmental reconstruction with endogene travertine are also discussed. They are the impacts of 'dead carbon' in radiocarbon dating and the enrichment in C-13 of travertine by endogenic CO2 and degassing of CO2 from water, which has to be considered in paleovegetation reconstruction when using delta(13)C data of the endogene carbonate deposits.
学科主题	水文地质学
WOS关键词	CALCITE PRECIPITATION ; HUANGLONG RAVINE ; CO2 ; CARBONATES ; EXAMPLES ; LAKES
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
出版者	SPRINGER-VERLAG
WOS记录号	WOS:000185092200008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37548]
专题	中国地质调查局
作者单位	1.Inst Karst Geol, Karst Dynam Lab, Guilin 541004, Peoples R China. 2.Guangxi Normal Univ, Dept Biol, Guilin 541004, Peoples R China. 3.China Univ Geosci, Grad Sch, Wuhan 430074, Peoples R China. 4.中国地质调查局岩溶地质研究所
推荐引用方式 GB/T 7714	Liu, Z,Zhang, M,Li, Q,et al. Hydrochemical and isotope characteristics of spring water and travertine;in the Baishuitai area (SW China) and their meaning for;paleoenvironmental reconstruction[J]. ENVIRONMENTAL GEOLOGY,2003,44(6):698-704.
APA	Liu, Z,Zhang, M,Li, Q,&You, S.(2003).Hydrochemical and isotope characteristics of spring water and travertine;in the Baishuitai area (SW China) and their meaning for;paleoenvironmental reconstruction.ENVIRONMENTAL GEOLOGY,44(6),698-704.
MLA	Liu, Z,et al."Hydrochemical and isotope characteristics of spring water and travertine;in the Baishuitai area (SW China) and their meaning for;paleoenvironmental reconstruction".ENVIRONMENTAL GEOLOGY 44.6(2003):698-704.