Uranium isotopic study of aragonite-calcite stalagmites: Implications for uranium-series dating

摘要：

This paper focuses on the relationship between re-crystallization and erroneous U-series dating based on 82 precise ICP-MS 230Th data collected during analysis of two big stalagmites. Aragonite is susceptible to conversion to calcite with major loss of chemical elements during recrystallization, a process induced by drip water infiltration. Conversion of aragonite to calcite leads to errors in dating, resulting in false apparent ages.Because 230Th dating assumes that all changes in isotope ratios are the result of radioactive decay and ingrowth within a closed system (no chemical/diagenetic shifts in isotope ratios), the effects of recrystallization must be considered.

作者: Y.Yang D.X.Yuan J.M.Qin Y.S.Lin M.L.Zhang X.Y Zhu H.Cheng R.L.Edwards

作者单位: School of Geographical Sciences, Southwest University, Chongqing, P.R.China;Karst Dynamics Laborator Karst Dynamics Laboratory, MLR, Guilin, Guangxi, P.R.China Geology and Geophysics Department, Minnesota University, MN, USA

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 821-825

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）