Characteristics of strontium isotope and their implications in Qixing Cave of Guizhou, China

	Characteristics of strontium isotope and their implications in Qixing Cave of Guizhou, China
	ZHU XiaoLong; WANG ShiJie; LUO WeiJun
	2011
发表期刊	Chinese Science Bulletin
卷号	56 期号:7 页码:670-675
摘要	The strontium isotopic compositions (87Sr/86Sr) of samples including soils, bedrock, soil waters, drip waters and their corresponding speleothems in the Qixing Cave (QXC), Guizhou Province, China, were systemically measured and analyzed. The results indicate that there are significant Sr isotopic differences among samples. The mean 87Sr/86Sr ratios in drip water for the samples 1# , 4# and 9# were 0.709568, 0.709139 and 0.708761, respectively, which possibly result from different flow paths, residence times, and other hydrogeological processes in the unsaturated zone overlying QXC. Meanwhile, levels of 40.8%, 57.6% and 72.4% of Sr in drip waters for 1# , 4# and 9# , respectively, were derived from bedrock dissolution, which was calculated by the mixture model of the two end-members (soil and bedrock). There is, however, no positive correlation between the relative proportion from bedrock dissolution (δ 13C value is 1.8‰) and drip water δ 13CDIC values. The mean drip water δ 13CDIC value in 1# is the heaviest (–4.5‰) with the lowest contribution rate of bedrock dissolution, whereas the value in 9# is the lightest (–9.3‰) with the highest contribution rate of bedrock dissolution. The proportion from host rock dissolution in 4# is higher than that in 1# and lower than that in 9# , while its mean drip water δ 13CDIC value (–8.6‰) is higher than that of 9# and lower than that for 1# . This suggests that the prior calcite precipitation (PCP) processes in the unsaturated zone overlying the cave are responsible for the δ 13CDIC value differences between different drip waters, and not bedrock dissolution. Furthermore, this study also demonstrates that the 87Sr/86Sr ratios of speleothems in the 1# and 4# mainly reflect the variation in the relative proportions from the soil system (soil water) and bedrock dissolution overlying the cave. It is, therefore, feasible to use the strontium isotopic signals of speleothems as an indicator for soil chemical weathering intensity, and consequently as a monsoon proxy in the study area.
关键词	Strontium Isotope Cave Drip Water Source Prior Calcite Precipitation (Pcp) Qixing Cave Of Guizhou
学科领域	环境地球化学
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/352002/6719
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	ZHU XiaoLong,WANG ShiJie,LUO WeiJun. Characteristics of strontium isotope and their implications in Qixing Cave of Guizhou, China[J]. Chinese Science Bulletin,2011,56(7):670-675.
APA	ZHU XiaoLong,WANG ShiJie,&LUO WeiJun.(2011).Characteristics of strontium isotope and their implications in Qixing Cave of Guizhou, China.Chinese Science Bulletin,56(7),670-675.
MLA	ZHU XiaoLong,et al."Characteristics of strontium isotope and their implications in Qixing Cave of Guizhou, China".Chinese Science Bulletin 56.7(2011):670-675.

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