Lead isotope variability in speleothems—A promising new proxy for hydrological change? First results from a stalagmite from western Germany

作者: Qichao Yang , Denis Scholz , Klaus Peter Jochum , Dirk L Hoffmann , Brigitte Stoll

DOI: 10.1016/J.CHEMGEO.2014.12.028

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摘要: Abstract We studied an aragonitic section of ca. 6 cm length stalagmite HBSH-1 from the Huttenblaserschachthohle, western Germany. 230 Th/U-dating revealed that this grew between ~ 210 and ~ 190 ka, with a relatively uniform growth rate 3.1 μm a − 1 . For first time, we determined Pb isotope ratios ( 207 Pb/ 206 208 Pb) in by laser ablation (LA)-ICP-MS. In addition, analyzed various trace element (Mg, Al, Si, P, Mn, Sr, Th) concentrations. The results indicate originated two external sources: (i) regional galena (PbS) mineralization high content as well ratios, (ii) carbonate fraction host rock low ratios. Except for all elements show similar variations, probably driven amount infiltration into cave system. This is result transport incorporation mechanisms these colloids and/or particles. also strong correlation variability strongly suggesting has potential to be used promising new proxy hydrological change. Based on observed variability, identify phases (from ~ 204.9 ~ 201.5 ~ 198.4 ~ 195.9 ka) enhanced water region. Between ~ 210.0 ~ 204.9, ~ 195.9 ~ 190.0 ka less occurred.

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