Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (2): 20101-020101.doi: 10.11889/j.0253-3219.2015.hjs.38.020101

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS •     Next Articles

Environment instruction significance and character of element geochemistry based on synchrotron radiation techniques from varved lake sediments of Erlongwan Maar Lake

YOU Haitao1 SUN Chunqing2 LI Quanlin3 LIU Jiaqi2   

  1. 1(Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences, College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China) 2(Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China) 3(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2014-08-20 Revised:2014-12-04 Online:2015-02-10 Published:2015-02-02

Abstract:

Background: High-resolutionary lacustrine sediments from Maar Lakes are very important to construct and understand the mechanism of paleoclimatic changes. Purpose: To study the tendency of climatic changes and the global warming in the 20th century, proxy indexes for temperature and precipitation during the Late-Holocene (from AD1282?AD1988) were obtained by high-resolutionary geochemical analysis on the varved sediments of Erlongwan Maar Lake (Northeastern China). Methods: Synchrotron radiation X-ray fluorescence spectroscopy (SRXRF) was performed on the lake sediments from Erlongwan Maar Lake and six elements including As, Br, K, Mn, Rb and Ti were obtained. Factor analysis on these elemental data was used to facilitate the interpretation of the results. Results: The three main factors, F1, F2 and F3, were extracted. These three factors are related to early diagenesis, biogenesis factor and basin erosion, respectively. The F2 and F3 scores may also be used as climate proxy indexes for changes in temperature and precipitation, respectively. Varve chronology over past 700 years from this core gives a precise time scale for evaluating this sediment sequence, climatic and environmental changes. Conclusion: Particularly during the Little Ice Age (LIA), the climate was not homogenous but characterized by three cold spells. After AD1890, the region had generally a warm and humid climate and concomitant trends of rising temperature and falling precipitation could be observed as a reflection of global warming in the 20th century.

Key words: Synchrotron radiation X-ray fluorescence analysis (SRXRF), Lake sediments, Element geochemistry, Erlongwan, Environmental change records, Varve chronology