High-resolution and precisely dated record of weathering and hydrological dynamics recorded by manganese and rare-earth elements in a stalagmite from Central China |
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| Authors: | Houyun Zhou Baoquan Chi Michael Lawrence Jianxin Zhao Jun Yan Alan Greig Yuexing Feng |
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| Institution: | aGuangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China;bRadiogenic Isotope Laboratory, Centre for Microscopy and Microanalysis, the University of Queensland, Brisbane, Queensland 4072, Australia;cSchool of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;dSchool of Earth Sciences, University of Melbourne, Melbourne, 3010, Australia |
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| Abstract: | Manganese (Mn) and rare-earth elements (REEs) in a stalagmite (SJ3) collected from Central China were analyzed, using an ICP-MS method for the precise determination of > 40 trace elements in geological samples by enriched-isotope internal standardization. Unlike speleothem Mn and REEs investigated by cathodoluminescence, which may be incorporated into crystal lattice, the Mn and REEs analyzed in SJ3 should come largely from colloidal and particle phases in groundwater and may be associated with non-carbonate inclusions. The Mn and REEs in SJ3 vary significantly during the period between 20 and 10 ka. These elements show remarkable increases since  14.5 ka, suggesting enhanced weathering of the overlying soil layer and the host rock since the onset of the last deglaciation and the strengthening of the Asian summer monsoon. In addition, the Mn and REEs in SJ3 display significant centennial fluctuations which may reflect groundwater dynamics. |
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| Keywords: | Mn REEs Speleothem Weathering Hydrology East Asia Summer monsoon |
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