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Pyrite in sliding mud: A Potential Indicator of Landslide Development

Journal of Earth Science 2010年第6期21卷 954-960页

作者：郑国东梁收运郎煜华马向贤梁明亮项伟 Key Laboratory of Petroleum Resources Research Lanzhou Institute of Geology Chinese Academy of Sciences Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences School of Civil Engineering and Mechanics Lanzhou University Institute of Geohazards Protection China Three Gorges University

A new principle of geochemical conditions within a landslide slip zone is presented based on the concept of a self-sealing closed system for which newly formed pyrite should be considered as a potential indicator. Once slip zones occur, a series of water-rock interactions may take place, particularly, a change in redox conditions simultaneously with progression of the landslide. This change induces weathering of the debris and bed rocks, and leads to accumulation of newly formed sliding mud within the slip zone. Pyrite formation along with clay mineral accumulation occurs under a weak alkaline-strong reducing environment along with landslide development. Thus, formation of neogenetic pyrite, iron speciation, and clay mineralization are all important factors for a better understanding of landslide progression.

关键词： pyrite sliding mud self-closedsystem landslide development

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Variation of iron species in sliding mud

引用

Chinese Science Bulletin 2002年第23期47卷 2018-2024页

作者： Guodong Zheng Sheng Xu Yuhua Lang Zifang Meng Chinese Acad Sci State Key Lab Gas GeochemLanzhou Inst GeolLanzhou 730000China

Results of Mossbauer spectroscopy and ICP-AES measurement revealed a special distribution pattern of iron species in four crossing profiles of the Tertiary Formation Type of Landslides in Japan. In comparison with host rocks, the sliding mud in the landslide slip zone contains the higher ferrous iron content and/or trace pyrite, which indicates that the forming environment was relatively reducing. The total iron content also increased with an increase in ferric iron and pyrite, in contrast, decreased with an increase in ferrous iron content. The deep-gray and black mud layers formed and accumulated in various volumes within landslide slip zones are treated as the basic criteria for the slipping activity, because the soft mud saturated with groundwater is easy to create a plastic deformation.

关键词： sliding mud Mossbauer spectroscopy iron speciation total iron slip zone redox condition

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