期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 288, 期 1-4, 页码 24-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palaeo.2010.01.029
关键词
Mollusk shell; Trace element; Oxygen isotope; Aragonite; Strontium
资金
- SIMGEO laboratory [BTE 2001-1532, CGL 2004-21117-E, CGL 2005-01467/BTE, CGL 2008-00594/BTE]
The Sr uptake features in Bithynia tentaculata aragonite shells from monthly collections in Lake Arreo (northern Spain) over a two-year period are compared with those from the same species grown in culture experiments with similar waters under controlled temperature. The shell aragonite of B. tentaculata from Lake Arreo formed in isotopic equilibrium with the lake water. A comparison of the stable oxygen isotope values (delta O-18) from the shells and waters allowed the selection of suitable shells for Sr uptake studies. The Sr/Ca molar ratio in B. tentaculata shells (Sr/Ca,hen) from the lake and from the culture experiments positively correlate with some chemical parameters like conductivity and solute composition. Some environmental factors such as pH and T have minor influence on Sr incorporation into shells, as reported from other aragonitic mollusks. The Sr/Ca-shell exhibits a good positive correlation with the Sr/Ca of the water (Sr/Ca-w) using linear regression. However, a polynomial function equation better fits the Sr/Cashell and the Sr/Ca-w (R-2 = 0.890, p = 2.923e-11). Above a value of 0.0025 for Sr/Ca-w, the ratios of Sr/Ca-shell present small changes. This pattern reveals a noticeable variation of the partitioning coefficient (KdSr) with Sr/Ca-w. The KdSr for B. tentaculata shell aragonite obtained in this study is 0.290 +/- 0.078 (n = 25) and it is close to the mean values obtained for other non-marine aragonitic mollusks. KdSr values in B. tentaculata are influenced by the variations in Sr/Ca-w that mask the T effect. This feature, together with the influence of physiological processes on the trace element incorporation, may explain the observed KdSr pattern. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据