Modern sedimentation system of Lake Untersee, East Antarctica

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• 作者：M. A. Levitan (1)
  Yu. P. Girin (1)
  V. L. Luksha (2)
  I. V. Kubrakova (1)
  I. A. Roshchina (1)
  B. Sattler (3)
  O. A. Tyutyunnik (1)
  M. Yu. Chudetskii (4)
  
• 关键词：East Antarctica ; glacier ; moraine ; cryosol ; mountain lake ; bottom sediments ; anoxic regime ; sapropel ; molybdenum ; gold ; palladium ; europium
• 刊名：Geochemistry International
• 出版年：2011
• 出版时间：May 2011
• 年：2011
• 卷：49
• 期：5
• 页码：459-481
• 全文大小：296KB
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• 作者单位：M. A. Levitan (1)
  Yu. P. Girin (1)
  V. L. Luksha (2)
  I. V. Kubrakova (1)
  I. A. Roshchina (1)
  B. Sattler (3)
  O. A. Tyutyunnik (1)
  M. Yu. Chudetskii (4)
  
  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia
  2. Geological Faculty, Moscow State University, Vorob鈥檈vy gory, Moscow, 119991, Russia
  3. Institute of Ecology, University of Innsbruck, Innsbruck, Austria
  4. Institute of Oil and Gas Problems, Russian Academy of Sciences, ul. Gubkina 3, Moscow, 119333, Russia
  
• ISSN：1556-1968

文摘

The paper presents data on the geographic and geological conditions of modern sedimentation in Lake Untersee, the largest lake in East Antarctica. Geochemical and sedimentation data indicate that the leading mechanism providing Al-Si sedimentary material to the surface layer of the bottom sediments is the seasonal melting of the Anuchin glacier and the mountain glacier on the southeastern face of the valley hosting the lake. The strongly reduced conditions in the lowermost 25 m of the water column in the smaller of the two depressions at the lake bottom were favorable for the enrichment of the bottom sediments in bacteriogenic organic matter, Mo, Au, and Pd. The H2S-contaminated water facilitates the significant enrichment of the sediments only in redox-sensitive elements able to migrate in the form of anionic complexes and precipitate (coprecipitate) as sulfides.